This tool provides an estimation for the peak heat loss of a building. The peak heat loss through the building fabric can give an indicative heat pump size
In order to successfully implement a low carbon heating source, the peak heat flow of the building should be understood. This will allow the new heating technology to be correctly sized and meet the heating demand during the coldest periods of the heating season. Without the availability of computational software, this method of calculation is a suitable alternative that will give a good representation of the peak heat load based on building heat losses.

The peak heat flow is calculated when the difference between the internal setpoint temperature and the outdoor design temperature is at it's greatest. The total heat flow is the sum of the thermal capacities of the building envelope plus the heat loss by ventilation through the building, multiplied by the temperature difference between the internal and external temperatures.

The peak heat loss through the building fabric will give an indicative heat pump size; other factors will also influence the size of the heat pump. When sizing the heat pump, ensure you consider whether the heat pump will supply DHW, and how the heating flow temperatures given on the manufacturers specification sheet will impact the amount of heat emitted.

.

Already have an account? Login