The second component

In general, the fee for hot water supply is calculated using the following formula:

P i gv = Vi gv × T hv+ (V v cr × Vi gv/ ∑ Vi gv × T v cr)

Vi Guards- the volume of hot water consumed during the billing period (month) in the apartment or non-residential premises

T xv- tariff for cold water

V v cr- the amount of thermal energy used during the billing period to heat cold water during the independent production of hot water by the management company

∑ Vi gv- the total volume of hot water consumed during the billing period in all rooms of the house

T v cr- tariff for thermal energy

Calculation example:

Let's assume that hot water consumption in an apartment for a month is 7 m3. Hot water consumption throughout the house is 465 m3. The amount of thermal energy spent on heating hot water according to a common house meter is 33.5 Gcal

7 m 3 * 33.3 rub. + (33.5 Gcal * 7 m 3 / 465 m 3 * 1331.1 rub.) = 233.1 + 671.3 = 904.4 rub.

Of which:

233.1 rub. - payment for actual water consumption (DHW line in the receipt)

671.3 - payment for thermal energy spent on heating water to the required temperature (DHW heating line in the receipt)

IN in this example To heat one cube of hot water, 0.072 gigacalories of thermal energy were spent.

IN the value showing how many gigacalories were required to heat 1 cubic meter of water in the calculation period is called DHW heating coefficient

The heating coefficient is not the same from month to month and largely depends on the following parameters:

Cold water supply temperature. IN different time During the year, the cold water temperature ranges from +2 to +20 degrees. Accordingly, in order to heat water to the required temperature, different amounts of thermal energy will have to be expended.

The total volume of water consumed per month in all areas of the house. This value is largely influenced by the number of apartments that submitted their testimony in the current month, recalculations, and, in general, the discipline of residents in submitting their testimony.

Thermal energy consumption for hot water circulation. Water circulation in the pipes occurs continuously, including during the hours of minimum water consumption. That is, for example, at night, hot water is practically not used by residents, but thermal energy for heating water is still spent to maintain the required temperature of hot water in heated towel rails and at the entrances to apartments. This figure is especially high in new, sparsely populated buildings and stabilizes as the number of residents increases.

The average values ​​of DHW heating coefficients for each block are given in the section “Tariffs and calculation coefficients”

With the arrival of cold weather, many Russians are concerned about how to pay for utilities. For example, To How to calculate hot water and how often you should pay for these services. To answer all these questions, you first need to clarify whether a water meter is installed in this home. If the meter is installed, then the calculation is made according to a certain scheme.

The first thing you need to do is look at the receipt for housing and communal services that came last month. In this document you should find a column that indicates the amount of water consumed for the last month; we will need figures with indicators at the end of the last reporting period.

The first thing you need to do is look at the receipt for housing and communal services that came last month

After these readings are written out, they should be entered into a new document. In this case, we are talking about a receipt for payment for housing and communal services for the next reporting period. As you can see, the answers to the questions of how to calculate the cost of hot water using a meter and how to determine its consumption are quite simple. It is necessary to take all water meter readings promptly and correctly.

By the way, many management companies themselves enter the above information into the payment document. In this case, you won’t have to look for data in old receipts. You also need to remember that in situations where the water meter has just been installed and these are the first readings, the previous ones will be zeros.

The initial readings of some modern meters may contain some other numbers rather than zeros

I would also like to clarify that the initial readings of some modern meters may contain not zeros, but some other numbers. In this case, in the receipt in the column where you need to indicate the previous readings, you need to leave exactly these numbers.

The process of searching for previous meter readings is very important if you need to understand the question of how to calculate hot water according to the meter. Without this data, it will not be possible to correctly calculate how many cubic meters of water were used in a given reporting period.

So, before you start studying the question of how to calculate the cost of hot water, you should learn how to take water meter readings.

Symbols on the meter

Almost all modern meters have a scale with at least 8 digits. The first 5 of which are black, but the second 3 are red.

Important

It is important to understand that only the first 3 digits, which are black, are displayed on the receipt. Because these are cubic meters data, and it is based on them that the cost of water is calculated. But the data that is colored red is liters. They do not need to be indicated on receipts. Although these data make it possible to estimate how many liters of water a particular family consumes over a certain reporting period. In this way, you can understand whether it is worth saving on this benefit or whether the consumption is within normal limits. And of course, you can determine how much water is spent on bathing procedures, and how much on washing dishes, and so on.

It is important to understand that the receipt displays only the first 3 digits, which are black.

To correctly understand how to calculate the tariff for hot water, you should know on what day of the month the readings of this device are taken. Here, you need to remember that water meter data must be taken at the end of each reporting period, after which it must be transferred to the appropriate authority. This can be done through a phone call or via the Internet.

On a note! It should be remembered that the figures are always indicated at the beginning of the reporting period (that is, those that were taken last month) and at the end (these are those that are being taken now).

This regulation is prescribed in the Decree of the Government of the Russian Federation dated May 6, 2011, number 354.

How to calculate the service correctly?

It is no secret that the legislation of our country is constantly changing, and therefore citizens are beginning to worry about the question of how to calculate hot water or any other utility costs.

If we talk specifically about water, then we should take into account the fact that payment consists of certain components:

• indicators of a water meter, which is located in the room and controls the flow of cold water;
• indicators of the meter, which shows the consumption of hot water in a given apartment;
• indicators of a device that calculates the cold water consumption of all tenants;
• data from the meter that monitors the consumption of the residents of the house; it is installed in the basement of the house;
• the share of a specific apartment in the total expense;
• the share that corresponds to a specific apartment in this building.

The penultimate indicator is the most incomprehensible, although in fact everything is quite accessible. It is taken into account when determining the amount of resource that was spent on everyone. It is also called “general house needs”. This, by the way, also applies to the last indicator; it is calculated when general house needs are calculated.

Calculation of hot water consumption

As for the first two indicators, they are quite understandable. They depend on the residents themselves, because a person can choose for himself whether to save the consumption of a particular resource or not. But in other cases, it all depends on how often wet cleaning is done in the entrance of the house, on the number of riser leaks, and so on.

The worst thing about this calculation system is that almost the entire part of the general household needs is fictitious. After all, in every building there are residents who incorrectly indicate their individual indicators, or, for example, one person is registered in their apartment, but five live. Then the general house needs had to be calculated based on the fact that 3 people live in apartment No. 5, and not 1. In this case, everyone else would have to pay a little less. As you can see, the question of how to calculate hot water still needs careful research.

That is why our officials are still trying to figure out how to calculate the fee for hot water and which mechanism would be the most successful.

Do everyone have the same rates?

To save money, you should always turn on the tap if you don’t need to use water at the moment.

To do this, just go to the website of the management company or just call them. Also, similar information is contained on the receipt that comes to each resident.

After this data has been found, the cost of the consumed cubic meters of resource should be calculated. Next, calculating the payment for hot water is quite simple; this is done in the same way as in the case of all other resources. You should take the number of cubic meters spent and multiply by the specific tariff.

It should be noted that today there are many ways you can save hot water consumption, thereby reducing your costs for paying for it. To do this, you can use special nozzles on the faucet; they will help you not spray water so much and control the pressure power. You should also open the tap valve not at full strength, so the stream will flow under less pressure, but the water will not fly out in all directions. And of course, you should always turn on the tap if you don’t need to use water at the moment. For example, when a person brushes his teeth or washes his hair (while his head is being soaped or his toothbrush is being lubricated, the water tap can be closed).

All these tips will help reduce the cost of paying for hot or cold water, thereby helping to correctly calculate hot water consumption.

Difference between hot and cold water calculations

Of course, this formula, as well as the one that takes into account hot water consumption, has many flaws. Due to the fact that general house indicators are taken into account, it is difficult to control where the difference went between the individual indicators of all residents and the data that was taken from the water meter installed on the house. Perhaps this is really true, and all this water was used to clean the entrance. But this is hard to believe. Of course, there are residents who deceive the state and give incorrect data, but there are also errors in the operation of the pipeline system itself (the sewer pipes in most houses are old and can leak, so the water goes nowhere).

Hot water invoice

For a long time now, our government has been thinking about how to correctly calculate hot and cold water and how to improve the existing mechanism.

For example, in 2013, our authorities came to the conclusion that it was necessary to establish standard norms for general household needs and that this data should be taken into account when calculating the cost of one cubic meter water. This helped to slightly restrain the zeal of our management companies and help the citizens of the country. You can find out these numbers from the management company. But this only applies to those cases where residents have entered into an agreement with the management company. If we are talking about Vodokanal, then each locality will have its own separate fixed minimum payment. And, for example, an overpayment in a given reporting period may cover expenses in the next one.

As you can see, there is a whole diagram that makes it clear how to calculate hot water heating or how to calculate how much to pay for cold water consumption.

Calculation of the cost of thermal energy for heating 1 sq. meters of total area in 2017:

January-April 0.0366 Gcal/sq. m * 1197.50 rub/Gcal = 43.8285 rub/sq.m.

May 0.0122 Gcal/sq. m * 1197.50 rub./Gcal = 14.6095 rub./sq.m

October 0.0322 * 1211.33 rubles/Gcal = 39.0048 rubles/sq.m.

November-December 0.0366 Gcal/sq. m * 1211.33 rub./Gcal = 44.3347 rub./sq.m

Calculation of the cost of service for hot water supply per person in 2017:

January-June 0.2120 Gcal/per person. per month *1197.50 rub./Gcal = 253.87 rub./person.

July-December 0.2120 Gcal/per person. per month *1211.33 rub./Gcal = 256.80 rub./person.

Calculation of the cost of service for hot water supply using a domestic hot water meter in 2017:

January – June 0.0467 Gcal/cub. m * 1197.50 rub./Gcal = 55.9233 rub./cubic. m.

July-December 0.0467 Gcal/cu.m. m * 1211.33 rub./Gcal = 56.5691 rub./cubic. m

2016

Calculation of the cost of thermal energy for heating 1 sq. meters of total area in 2016:

January-April 0.0366 Gcal/sq. m * 1170.57 rub/Gcal = 42.8429 rub/sq.m.

May 0.0122 Gcal/sq. m * 1170.57 rub./Gcal = 14.2810 rub./sq.m

October 0.0322 * 1197.50 rubles/Gcal = 38.5595 rubles/sq.m.

November-December 0.0366 Gcal/sq. m * 1197.50 rub./Gcal = 43.8285 rub./sq.m

Calculation of the cost of hot water supply services per person in 2016:

January-June 0.2120 Gcal/per person. per month *1170.57 rub./Gcal = 248.16 rub./person.

July-December 0.2120 Gcal/per person. per month *1197.50 rub./Gcal = 253.87 rub./person.

Calculation of the cost of service for hot water supply using a domestic hot water meter in 2016:

January – June 0.0467 Gcal/cub. m * 1170.57 rub./Gcal = 54.6656 rub./cubic. m

July-December 0.0467 Gcal/cu.m. m * 1197.50 rub./Gcal = 55.9233 rub./cubic. m

2015

Calculation of the cost of thermal energy for heating 1 sq. meters of total area in 2015:

Heating consumption standard * Thermal energy tariff = cost of thermal energy for heating 1 sq. m:

January-April 0.0366 Gcal/sq. m * 990.50 rub./Gcal = 36.2523 rub./sq.m

May 0.0122 Gcal/sq. m * 990.50 rub./Gcal = 12.0841 rub./sq.m

October 0.0322 * 1170.57 rubles/Gcal = 37.6924 rubles/sq.m.

November-December 0.0366 Gcal/sq. m * 1170.57 rub./Gcal = 42.8429 rub./sq.m

Calculation of the cost of hot water supply services per person in 2015:

Standard DHW consumption* Heat tariff = cost DHW services for 1 person

An example of calculating the cost of a hot water supply service for 1 person with a fully equipped apartment (from 1 to 10 storeys, equipped with a sink, washbasin, bathtub 1500-1700 mm long with shower) in the absence of hot water meters:

January-June 0.2120 Gcal/per person. per month *990.50 rub./Gcal = 209.986 rub./person.

July-December 0.2120 Gcal/per person. per month *1170.57 rub./Gcal = 248.1608 rub./person.

Calculation of the cost of service for hot water supply using a domestic hot water meter in 2015:

The standard thermal energy consumption for heating is 1 cubic meter. m of water * Tariff for thermal energy = cost of service for heating 1 cubic meter. m

January – June 0.0467 Gcal/cub. m * 990.50 rub./Gcal = 46.2564 rub./cubic. m

July-December 0.0467 Gcal/cu.m. m * 1170.57 rub./Gcal = 54.6656 rub./cubic. m

year 2014

Calculation of the cost of thermal energy for heating 1 sq. meters of total area in 2014:

Heating consumption standard * Thermal energy tariff = cost of thermal energy for heating 1 sq. m:

January-April 0.0366 Gcal/sq. m * 934.43 rub./Gcal = 34.2001 rub./sq.m

May 0.0122 Gcal/sq. m * 934.43 rub./Gcal = 11.4000 rub./sq.m

October 0.0322 Gcal/sq. m * 990.50 rub./Gcal = 31.8941 rub./sq. m

November – December 0.0366 Gcal/sq. m * 990.50 rub./Gcal = 36.2523 rub./sq.m

Calculation of the cost of service for hot water supply per 1 person in 2014:

DHW consumption standard * Heat energy tariff = cost of DHW service per 1 person

An example of calculating the cost of a hot water supply service for 1 person with a fully equipped apartment (from 1 to 10 storeys, equipped with a sink, washbasin, bathtub 1500-1700 mm long with shower) in the absence of hot water meters:

January-June 0.2120 Gcal/per person. per month * 934.43 rub./Gcal = 198.0991 rub./person.

July – December 0.2120 Gcal/per person. per month * 990.50 rub./Gcal = 209.986 rub./person.

Calculation of the cost of service for hot water supply using a domestic hot water meter in 2014:

The standard thermal energy consumption for heating is 1 cubic meter. m of water * Tariff for thermal energy = cost of service for heating 1 cubic meter. m

January – June 0.0467 Gcal/cub. m * 934.43 rub./Gcal = 43.6378 rub./cubic. m

July – December 0.0467 Gcal/cubic. m * 990.50 rub./Gcal = 46.2564 rub./cubic. m

year 2013

Calculation of the cost of thermal energy for heating 1 sq. meters of total area in 2013:

Heating consumption standard

• January-April 0.0366 Gcal/sq. m * 851.03 rub./Gcal = 31.1477 rub./sq.m
• May 0.0122 Gcal/sq. m *851.03 rub./Gcal =10.3826 rub./sq.m
• October 0.0322 Gcal/sq. m * 934.43 rub./Gcal = 30.0886 rub./sq. m
• November – December 0.0366 Gcal/sq. m * 934.43 rub./Gcal = 34.2001 rub./sq.m

Calculation of the cost of service for hot water supply per 1 person in 2013:

DHW consumption standard

An example of calculating the cost of a hot water supply service for 1 person with a fully equipped apartment (from 1 to 10 storeys, equipped with a sink, washbasin, bathtub 1500-1700 mm long with shower) in the absence of hot water meters:

• January-June 0.2120 Gcal/per person. per month * 851.03 rub./Gcal = 180.4184 rub./person.
• July – December 0.2120 Gcal/per person. per month * 934.43 rub./Gcal = 198.0991 rub./person.

Calculation of the cost of service for hot water supply using a domestic hot water meter in 2013:

The standard thermal energy consumption for heating is 1 cubic meter. m of water

• January – June 0.0467 Gcal/cub. m * 851.03 rub./Gcal = 39.7431 rub./cubic. m
• July – December 0.0467 Gcal/cubic. m * 934.43 rub./Gcal = 43.6378 rub./cubic. m

year 2012

Calculation of the cost of thermal energy for heating 1 sq. meters of total area in 2012:

Heating consumption standard * Thermal energy tariff (supplier MUP "ChKTS" or Mechel-Energo LLC) = The cost of thermal energy for heating 1 sq. m

• January-April 0.0366 Gcal/sq. m * 747.48 rub./Gcal = 27.3578 rub./sq. m
• May 0.0122 Gcal/sq. m * 747.48 rub./Gcal = 9.1193 rub./sq. m
• October 0.0322 Gcal/sq. m * 851.03 rub./Gcal = 27.4032 rub./sq. m
• November - December 0.0366 Gcal/sq. m * 851.03 rub./Gcal = 31.1477 rub./sq. m

Calculation of the cost of hot water supply services per person in 2012:

DHW consumption standard * Heat energy tariff (supplier MUP "ChKTS" or Mechel-Energo LLC) = cost of DHW service per 1 person

An example of calculating the cost of a hot water supply service for 1 person with a fully equipped apartment (from 1 to 10 storeys, equipped with a sink, washbasin, bathtub 1500-1700 mm long with shower) in the absence of hot water meters:

• January - June 0.2120 Gcal/per 1 person. per month * 747.48 rub./Gcal = 158.47 rub./person.
• July - August 0.2120 Gcal/per person. per month * 792.47 rub./Gcal = 168.00 rub./person.
• September - December 0.2120 Gcal/per person. per month * 851.03 rub./Gcal = 180.42 rub./person.

Calculation of the cost of hot water supply services using a domestic hot water meter in 2012:

The standard thermal energy consumption for heating is 1 cubic meter. m of water * Tariff for thermal energy (supplier MUP "ChKTS" or LLC "Mechel-Energo") = cost of service for heating 1 cubic. m

• January – June 0.0467 Gcal/cub. m * 747.48 rub./Gcal = 34.9073 rub./cubic. m
• July – August 0.0467 Gcal/cubic. m * 792.47 rub./Gcal = 37.0083 rub./cubic. m
• September–December 0.0467 Gcal/cubic. m * 851.03 rub./Gcal = 39.7431 rub./cubic. m

By order of the Committee on Tariffs and Prices of the Moscow Region dated December 13, 2014 No. 149-R “On setting tariffs for hot water for 2015”, a two-component tariff for hot water was approved on the basis of Resolution of the Russian Federation dated May 13, 2013 No. 406 “On state regulation of tariffs in in the field of water supply and sanitation." The procedure for calculating and paying fees for utility services is defined in the Rules for the provision of utility services, approved by Government Decree Russian Federation No. 354. Accordingly, the calculation procedure for payment for hot water has been changed. Now the fee for 1 cubic meter of hot water consists of two components:

First- fee for 1 cubic meter of cold water.

Second- payment for thermal energy that was spent on heating 1 cubic meter of cold water.

The cold water component is the volume of cold water (CW) for hot water supply needs. If there are individual metering devices (meters), this component is determined - according to the readings of the hot water metering device (DHW), in the absence of an individual metering device - according to the standard, i.e. 3.5 cubic meters per 1 person. per month.

From January 1, 2015, residents apartment buildings in the city of Lyubertsy, which are equipped with common house metering devices, charges for payment for hot water are made according to a two-component tariff: the cold water component for DHW and the thermal energy component for DHW.

Payment for hot water for residents of the house must also be made according to a two-part tariff. The house is equipped with common house hot water metering devices. Payment for hot water from 07/01/2015 must be calculated according to the current two-component tariff: the cold water component for DHW (at a tariff of 33.28 rubles / cubic meter) and the thermal energy (TE) component for DHW at a tariff of 2141.46 rubles ./Gcal.

In receipts for payment for housing and communal services from July 1, 2015, “Hot water supply” is indicated in two lines:

Cold water supply for hot water supply - the volume of cold water (cold water supply) for hot water supply needs;

TE for hot water supply - thermal energy spent on heating 1 cubic meter of cold water.

The readings of a common house meter - the amount of hot water for the current month and the amount of thermal energy consumed in the current month for circulation and heating of the specified amount of water are shown on back side receipts, for example, are as follows:

1089.079 cu.m. m. - PV for hot water supply (physical water for hot water supply);

110.732 Gcal. - TE for hot water supply (thermal energy for hot water supply).

The actual amount of thermal energy that is spent on heating 1 cubic meter of cold water for a home is determined based on the total volume of thermal energy to the total volume of hot water for the current month, which is:

= TE for DHW / PV for DHW = 110.732 Gcal. / 1089.079 cu.m. m. = 0.1017 Gcal/cub.m

then, the actual cost of thermal energy spent on heating 1 cubic meter of water in the current month will be:

0.1017 Gcal/cub.m x 2141.46 rub. for 1 Gcal. = 217.79 rub.

Please note that the amount of thermal energy spent on heating 1 cubic meter of cold water in each billing month may differ, because is a calculated value and depends on the amount (volume) of hot water consumed by the house in the current month and the amount of thermal energy spent on circulating and heating this volume. Every month, these readings are taken from the general house heat energy meter and transferred to the heat supply organization and at the same time recorded on the back of the receipt for each current month.

In accordance with the Decree of the Government of the Russian Federation dated May 13, 2013 No. 406 “On state regulation of tariffs in the field of water supply and sanitation,” with a centralized hot water supply system in a closed system, a two-component tariff for hot water is established, consisting of “ cold water component "(rub./m3) and " component for thermal energy "(RUB/Gcal). The resource supplying organization supplying hot water makes settlements with the utility service provider ( Management Company, HOA) for 2 resources: cold water – at the tariff for the “cold water component”; thermal energy – at the tariff for the “thermal energy component”. The value of the cold water component is calculated by the tariff regulatory body based on the tariff for cold water. Value The component for thermal energy is determined by the tariff regulatory body in accordance with methodological instructions based on the following components: tariff for thermal energy; costs for maintaining centralized hot water supply systems in the area from central heating points (inclusive), where hot water is prepared, to points on the border of the operational responsibility of the subscriber and the regulated organization in the event that such costs are not taken into account in the tariff for thermal energy; · the cost of thermal energy losses in pipelines in the area from the facilities where hot water is prepared, including from central heating points, including the maintenance of central heating points, to the point on the border of the operational responsibility of the subscriber and the regulated organization in the event that such losses do not taken into account when setting tariffs for thermal energy; costs associated with the transportation of hot water. Providers of utility services in accordance with the “Rules for the provision of utility services to owners and users of premises in apartment buildings and residential buildings”, approved by Decree of the Government of the Russian Federation of May 6, 2011 No. 354 (hereinafter referred to as the Rules), calculate the amount of payment for utility services for hot water supply for the volume of hot water consumed in cubic meters. In accordance with the Rules, the amount of payment (P i) for the utility service for hot water supply, in a room equipped with an individual hot water meter, is determined by the formula: P i = V i n * T k p (1), where: V i n is the volume (quantity) consumed during the billing period in i-th core or non-residential premises of a communal resource, determined according to the readings of an individual meter; T to p — tariff for a utility resource. Since the tariff for the utility resource “hot water” is set in the form of two components, the utility service provider with consumers of hot water makes payments for the components: cold water and thermal energy for hot water supply needs. Amount of thermal energy (Gcal/ m 3) for hot water supply needs per 1 m 3, as a rule, is determined by the utility service provider on the basis of general house (collective) readings of hot water meters and thermal energy in hot water. It should be noted that the utility service provider makes settlements with the resource supplying organization based on the readings of the same common house (collective) metering devices for hot water and thermal energy in hot water. The consumed amount of thermal energy in hot water in the i-room (Gcal) is determined by multiplying the amount hot water by individual device metering (m 3) per specific consumption thermal energy in hot water (Gcal/m3). The volume of hot water determined by an individual meter (m3) is multiplied by the “cold water component” tariff (RUB/m3) - this is the charge for cold water in the composition hot water. The volume of thermal energy in consumed hot water (Gcal) is multiplied by the tariff “component for thermal energy” (RUB/Gcal) - this is the payment for thermal energy in the composition of hot water. In accordance with the information letter of the Federal Tariff Service of Russia dated November 18, 2014 No. SZ-12713/5 “On the issue of regulation of tariffs for hot water in a closed hot water supply system for 2015”, it is stated that the executive authorities of the constituent entities of the Russian Federation in the field of state regulation of prices (tariffs) has the right to make a decision on the establishment of tariffs for hot water in a closed hot water supply system per 1 cubic meter. m. In this case, the calculation of the tariff for hot water (T hot water) per 1 m 3 is made according to the formula: T hot water = T hot water * (1 + K pv) + US central heating + T t/e * Q t/e (2), where :T hvs - tariff for cold (rub./cubic m);T t/e - tariff for thermal energy (rub./Gcal); K pv - coefficient taking into account water losses in closed systems heat supply from central heating points to the connection point; US central heating - specific costs for the maintenance of hot water supply systems from central heating points to the boundaries of the balance sheet of consumers (excluding losses) in the event that such costs are not taken into account in tariffs for thermal energy (power), per 1 cubic meter m;Q t/e - the amount of heat required to prepare one cubic meter of hot water (Gcal/cub. m). At the same time, the amount of heat for preparing one cubic meter of hot water (Q t/e) is determined by calculation, taking into account heat capacity, pressure, temperature, density of water, losses of thermal energy in risers and heated towel rails. Thus, the charge in the receipt for hot water depends on the form in which the regulatory authority has set the tariff for hot water: for two components (cold water and thermal energy ) or per cubic meter. In question the amounts of charges for 2 components (cold water and thermal energy) are given, but not indicated municipality and tariffs for components. If we assume that hot water consumption was 10 m3, then the tariff for the “cold water component” is 331 rubles. / 10 m 3 = 33.10 rubles/m 3. If we assume that the tariff for the “thermal energy” component is 1800 rubles/Gcal, the amount of thermal energy consumed is: 1100 rubles. /1800 rub./Gcal = 0.611 Gcal, respectively, to heat 1 m 3 of hot water, the thermal energy consumption was 0.611 Gcal / 10 m 3 = 0.0611 Gcal/m 3. Chief Economist of the Yurenergo Group of Companies Isaeva T.V.

Water consumption for hot water supply needs should be determined according to hot water consumption standards, taking into account the likelihood of using water taps. Determine the load on DHW system according to the maximum flow rate of hot water and take it into account when choosing a heat source. Hello, dear friends! We are used to using it every day hot water and we can hardly imagine comfortable life, if you cannot take a warm bath or you have to wash dishes under a tap from which a cold stream flows. Water desired temperature and in the right quantity - this is what the owner of every private home dreams of. Today we will determine the estimated water and heat consumption for hot water supply to our home. You must understand that at this stage it is not particularly important to us where we get this heat. Perhaps we will take it into account when choosing the power of the heat supply source and will heat water for the needs of hot water supply in the boiler. Perhaps we will heat water in a separate electric boiler or a gas water heater, or perhaps they will bring it to us.

Well, what if there are no technical capabilities to install a hot water system at home, then we will go to our own or the village bathhouse. Our parents mostly went to the city baths, and now the mobile Russian bathhouse under your window has rung. Of course, life does not stand still and having a bath and shower in the house today is no longer a luxury, but a simple necessity. Therefore, we will provide a hot water supply system in the house. The correct calculation of the hot water supply will determine the load on the domestic hot water system and, ultimately, the choice of the power of the heat source. Therefore, this calculation must be approached very seriously. Before choosing the design and equipment of a domestic hot water system, we need to calculate the main parameter of any system - the maximum hot water flow per hour maximum water consumption(Q g.v max, kg/h).

In practice, using a stopwatch and a measuring container, we determine the consumption of hot water, l/min when filling the bathtub

Calculation of the hourly maximum flow of hot water at the hour of its maximum water consumption

To calculate this consumption, let's turn to the hot water consumption standards (according to chapter SNiP 2-34-76), see Table 1.

Hot water consumption standards (according to chapter SNiP 2-34-76)

Table 1

g и.с – average for heating season, l/day;

g and – maximum water consumption, l/day;

g i.h – highest water consumption, l/h.

Dear friends, I want to warn you against one common mistake. Many developers, and even young inexperienced designers, perform hourly calculations maximum flow hot water according to the formula

G max =g i.h *U, kg/h

g i.h – rate of hot water consumption, l/h, maximum water consumption, taken according to table 1; U – number of hot water consumers, U=4 people.

G max = 10 * 4 = 40 kg/h or 0.67 l/min

Q year max = 40 * 1 * (55 – 5) = 2000 kcal/h or 2.326 kW

Having calculated the water flow in this way and selected the power of the heat source to heat this flow, you have calmed down. But when you get into the shower, you will be surprised to find that only 3 drops of water per second are dripping onto your dirty and sweaty bald head. Neither washing your hands, nor rinsing the dishes, not to mention taking a bath is out of the question. So what's the deal? And the mistake is that the maximum hourly water consumption for the day of greatest water consumption was not correctly determined. It turns out that all hot water consumption rates according to Table 1 should be used only to calculate the flow rate through individual devices and the likelihood of using their action. These standards are not applicable to determine costs based on the number of consumers, by multiplying the number of consumers by specific consumption! This is precisely the main mistake made by many calculators when determining the heat load on a hot water supply system.

If we need to determine the performance of heat generators (boilers) or heaters in the absence of hot water storage tanks for subscribers (our case), then the estimated load on the hot water system must be determined by the maximum hourly consumption of hot water (heat) for the day of greatest water consumption using the formula

Q g.v max =G max * s * (t g.wed –t x), kcal/h

G max – maximum hourly consumption of hot water, kg/h. The maximum hourly consumption of hot water, G max, taking into account the likelihood of using water taps, should be determined by the formula

G max = 18 *g * K and * α h * 10 3, kg/h

g – hot water consumption rate, l/with water taps. In our case: for a washbasin g y = 0.07 l/s; for washing g m = 0.14 l/s; for shower g d = 0.1 l/s; for a bath g in = 0.2 l/s. We choose a larger value, that is, g = g in = 0.2 l/s; K and – dimensionless coefficient of use of a water-folding device for 1 hour of maximum water consumption. For a bathtub with a characteristic (highest) hot water flow g x = 200 l/h, this coefficient will be equal to K u = 0.28; α h is a dimensionless value determined depending on the total number N of water-folding devices and the probability of using them R h for 1 hour of greatest water consumption. In turn, the probability of using water-folding devices can be determined by the formula

R h =g i.h *U/3600*K and*g*N

g i.h – rate of hot water consumption per hour of greatest water consumption, l/h. It is taken according to table 1, g and.h = 10 l/h; N – total number of water taps installed in the house, N = 4.

R h = 10 * 4 / 3600 * 0.28 * 0.2 * 4 = 0.0496. At R h< 0,1 и любом N по таблице (N * Р ч = 0,198) определяем α ч = 0,44

G max = 18 * 0.2 * 0.28 * 0.44 * 10 3 = 444 kg/h or 7.4 l/min.

Q year max = 444 * 1 * (55 – 5) = 22200 kcal/h or 25.8 kW

No, neither the desired temperature nor the proper flow of hot water - discomfort

As you can see, dear friends, the consumption of water and, accordingly, heat has increased approximately 10 times. In addition, the heat consumption for hot water supply (25.8 kW) is 2 times greater than the total heat consumption for heating and ventilation of the house (11.85 + 1.46 = 13.31 kW). If this data is presented to the “Customer”, then his hair will stand on end and he will demand that they explain to him - what’s the matter? So let's help him. Tables 2 and 3 below will help us with this. Now let's turn to Table 2 and calculate the highest hourly water consumption when loading all water consumers at the same time. Adding up all the typical costs, we get 530 l/h. As you can see, the total characteristic consumption turned out to be 86 l/h more than the calculated one (444 l/h). And this is not surprising, since the likelihood that all water taps will work at the same time is very small. Our maximum requirement for hot water is already 84%. In reality, this value is even less – about 50%. Let's try to get the real value, for this we use table 3. Do not forget that hot water consumption standards are developed for consumers at t g.av = 55 o C, but from the table we will find costs at t g. av = 40 o C.

The minimum total consumption of hot water, with an average water temperature equal to t g.v = 40 o C and the simultaneous operation of all water intake devices with a probability of this consumption of 84%, will be equal to G min =[ (5 * 1.5) + (20 * 5) + (30 * 6) +(120 * 10) ] * 0.84 = 342.3 l/h (239.6 l/h at t g.v = 55 o C)

The maximum total consumption of hot water, with an average water temperature of 40 o C and the simultaneous operation of all water intake devices with a probability of this consumption of 84%, will be equal to G max = [ (15 * 3) + (30 * 5) + (90 * 6 ) +(200 * 15) ] * 0.84 = 869.4 l/h (608.6 l/h at t g.v = 55 o C)

The average flow rate at t g.v = 55 o C will be equal to G avg = (G min + G max)/2 = (239.6 + 608.6)/2 = 424.1 l./h. So we got what we were looking for - 424.1 l/h instead of 444 l/h according to calculations.

Hot water consumption standards for water taps (chapter SNiP 2-34-76)

table 2

Hot water consumption standards for various water intake devices

Table 3

Thus, when calculating hot water supply, it is imperative to take into account the following nuances: the number of residents; frequency of use of the bath, shower; number of bathrooms where hot water is used; specifications plumbing elements (for example, the volume of a bathroom); the expected temperature of the heated water, as well as the likelihood of using water taps at the same time. IN next posts We will take a closer look at three common hot water supply systems. Depending on the method of heating water, these systems, for private country house, subdivided: DHW with storage water heater(boiler); DHW with instantaneous water heater; DHW with double-circuit boiler.

What do you think I’m doing?!!!

The obtained values ​​of water and heat consumption for DHW needs – G max = 444 kg/h or 7.4 l/min and Q g.v max = 22200 kcal/h or 25.8 kW we accept, with subsequent clarification, when choosing a heat source. Today we completed the 4th point of our home plan - we calculated the maximum hourly hot water consumption for a private house. Who hasn't joined yet, join us!

Best regards, Gregory