Receiving utility bills, it is rather difficult to understand many aspects of calculations and to understand: from where did any given figure undertake? One of striking examples of similar "difficulties of the translation" - payment for the delivered heat. If on your house the uniform thermal counter is installed, then accounts to you will come for the used Gcal (gigacalories), and here the tariff for hot water, as we know, is established for cubic meters. How to deal with calculation of cost of heat?
Instruction
1. Perhaps, the greatest complexity consists just in technical impossibility to transfer gigacalories to cubic meters or back. These are absolutely different physical quantities: one serves measurement of thermal energy, another – volume, and as prompts a basic course of physics, they are incomparable. The task of the consumer of utilities as a result comes down to calculating a ratio of the spent amount of heat and volume of the spent hot water.
2. Finally not to get confused, it is worth beginning with determination of rated sizes. So, understand that amount of heat which is necessary for heating on 1 °C of one cubic centimeter of water as calorie. In Gcal one billion calories, in cubic meter - one million centimeters, therefore for heating on 1 °C of one cubic meter of water to you are required to 0.001 Gcal. Considering that hot water should not be colder than 55 °C, and cold water arrives at a temperature of 5 °C, it is obvious that it will be required to heat it on 50 °C, that is to spend 0.05 Gcal of thermal energy for each cubic meter. In the sphere of utility tariffs higher standard of heat consumption affects heating of one cubic meter of water – 0.059 Gcal, it is connected with losses of heat which arise at transportation of water through the pipeline.
3. Further everything is simple, divide heat expense according to indications of the house counter into the number of residents. Receive thus heat expense on each resident, and having divided the received figure into the standard 0.059 - that volume of hot water in cubic meters which has to be paid by each resident. The only subtlety at such calculation – need to subtract from it those residents at which consumption counters in the apartment are installed.
4. Let's consider calculation on an example: the expense on the all-house counter made 30 Gcal, residents which have internal metering devices spent totally 35 m³ of hot water, residents without metering devices in the house – 75 people.
5. We consider: 35*0.059 = 2.065 - this amount of heat spent by residents which have metering devices; 30-2.065 = 27.935 Gcal – the rest of an expense on other residents; 27.935/75 = 0.372 Gcal – heat expense on one resident; 0.372/0.059 = 6.31 m³ of hot water it will be exposed in the account to each resident, from those whose apartments are not equipped with metering devices.