Calculation of heat capacity for space heating

Before making any decisions about the choice of heating system, the thickness of the insulation, the structural units and everything related to energy consumption, there are two questions to answer:

1) What kind of energy source we have for heating, hot water, lighting and household needs. That is, some electrical power is available for use, what is the cost of gasification of the site, and so on. This imposes certain restrictions on our future home.

2) It is necessary to determine how much energy we need for a comfortable life in each month of the year.

After answering these two questions, we can be sure that the opportunities we have, based on the first paragraph, satisfy our needs from the second point.

And if with the identification of opportunities, it is clear that with accurate calculation of energy consumption sometimes there are difficulties. By making such calculations on the eye (for example, based on the advice of familiar plumbers, usually 100 W / m2 of the total area of ​​the house), we take the risk of building an incorrect system that will work completely unpredictable.

The main problems we can create for ourselves:

• By overestimating our needs, we thereby increase the required power of the necessary equipment, which accordingly affects its cost. (1kW of heat for equipment costs can cost between $ 200 and $ 1000)
• Equipment that operates at below rated power typically consumes more power than normal. For solid fuel boilers, the formation of deposits on the pipes is significantly increased. Gas boilers increase gas consumption.
•   Lowering the power requirements, we can face a decrease in comfort without the possibility of increasing it (for example, if for heating with an estimated consumption of 10 kW and available electric power of 8 kW for all needs, an air heat pump with a maximum capacity of 12 kW is chosen for heating. but based on the specifics of the operation of the heat pump at an outside temperature below -12 degrees Celsius, we will get electricity consumption of more than 8 kW only for heating without taking into account other needs leading to hrevantazhennya electric network)
•  We recommend that you make the most accurate calculation of heat losses and heat revenues. Based on the obtained data, select the necessary thicknesses of insulation and design a heating system that will be most profitable in operation.

When calculating the heat losses of a room we consider:

1. Areas of all enclosure structures (walls, floors, ceilings)

2. The solution of insulation on all structural elements

3. Cold bridges around the perimeter of the foundation, mauerlat, adjoining porches, terraces and balconies.

4. Heat loss through window structures including perimeter installation system, heat loss through glazing edges, window structure configuration

5. We estimate heat input from natural light on a monthly basis

6. Consider the impact of shading from the peaks, sheds, surrounding buildings.

7. e set the required level of tightness of the building and take into account the influence of the ventilation system that will be applied in the house.

8.  If necessary, evaluate the installation and performance of photovoltaic and thermal solar energy systems (SPP, solar collectors)

9. We can calculate the radar of an active house and evaluate it as a designed building in the complex.
   

I would like to point out that all the calculations are performed with the utmost accuracy in the Passive House Planning Software (PHPP), which has proven to be effective over the last 10 years.

How do we calculate room heat loss to calculate the heat output for space heating?

You can read all about heat engineering calculation and independent examination of home projects here.