Heat Pump Tool

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Description


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Description:

Every single heat pump needs to be evaluated, especially for a particular case, in order to get a precise picture about its performance. This process allows for more efficient operation of a unit as installation of oversized units can be avoided. What is more, investment costs can be lowered as well, as larger units often cost more. An oversized unit will also often cycle ON and OFF, having a negative result on life expectancy of the compressor. Finally, a properly designed unit will also consume less energy over the life-time of the unit.

Input:

Required inputs:

The SPF or SEER and nominal capacity of unit. Inputs derived following either EN 14 825 or AHRI 210/240 can be used.

Output:

Performance data (COP for heating, EER for cooling) and available power of an air-to-air heat pump for different outside temperatures are returned as results.

The output of the tool can be used as input for various building performance software packages.

Strength:

Every single heat pump needs to be evaluated, especially for a particular case, in order to get a precise picture about its performance. This process allows for more efficient operation of a unit as installation of oversized units can be avoided. What is more, investment costs can be lowered as well, as larger units often cost more. An oversized unit will also often cycle ON and OFF, having a negative result on life expectancy of the compressor. Finally, a properly designed unit will also consume less energy over the life-time of the unit.

Challenge:

The generated performance values are approximated. The methods behind the calculation of the SPF and SEER values, provided by standards EN 14 825 and AHRI 210/240, was reverse engineered for the developed tool (the calculation methodology was followed in reverse). This means that input data were calculated from “results” delivered when following that particular standard. The tool was however tested on a large sample of different air-to-air heat pumps (from the EU and US markets) and provided performance values with sufficient precision. Nevertheless, when the performance data from a manufacturer is available, that data should be preferred.

Outcome:

The tool generates approximated performance data for air-to-air heat pumps, data not generally supplied by the manufacturer. Different tools available on the market can be used to evaluate the use of heat pumps for a concrete building in a particular location.

The output values form the Heat pump tool can be used and entered in energy balanced calculation tools, for example in the Passive House Planning Package.

Format:

Microsoft Excel and operates under Microsoft Windows