# Heat Loss Calculation

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• Topic: Temperature, Thermodynamics, Entropy
• Pages : 4 (771 words )
• Published : March 20, 2011

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Heat Loss Calculations Using a Computer

Objective:
Using the Hevacomp computer program I am going determine the design Heat Losses and recommend methods to improve the thermal performance of the building. Method:
The method for these calculations will be carried out on a computer using the Hevacomp software. Once the software is in use details such as internal temperature, external temperature and the air change rate need to be entered into the system followed by the surface of the room in question and the surfaces’ areas. Then for each surface you need to enter the U values as well as the air temperatures on the other side of the surface, the software will then calculate the temperature difference and fabric heat loss for each surface as well as the total heat loss for the room. This procedure then needs to be repeated for each of the other two rooms. Results:

Room 1 (Office 1)
Air Change Rate – 3 a c hr¯¹
Temperatures (°C):
Resultant21.5
Environmental22
Air20

SurfaceArea (m²)U-ValueTemperature differenceFabric Loss (w) Exposed wall number 111.180.3522.590
Exposed wall number 215.40.3522.5124
Int. partition number 116.8100
Int. partition number 215.4100
Exposed roof330.3522.5265
Solid ground floor330.4522.5341
Window in wall 15.632.822.5362
Fabric Loss1182
Natural Infiltration1940
Total Room Heat Loss – 3123 W
Average – 94.62 W/m²
33.79 W/m³

Room 2 (Office 2)
Air Change Rate – 3 a c hr¯¹
Temperatures (°C):
Resultant21.5
Environmental22.1
Air20