24 June 2014

FIELD TEST BASED VALIDATION OF A HEAT PUMP MODEL FOR THE DETERMINATION OF SEASONAL PERFORMANCE FACTORS


In the residential sector, heat pumps are applied for domestic hot water and space heating. Simulations are widely used to plan such installations or for more general research in the field of heat pumps. Their advantages are low expenditure of time and costs. In
contrast to simulations, field tests are conducted to evaluate the operation of heat pumps under real-life conditions.
Validation of simulation models is mandatory to guarantee a sufficient quality, i.e. the confirmation that a computerised model represents reality within specified limits of accuracy.
In the presented paper, the field monitoring results of three ground-source installations are utilised for the validation of a black-box heat pump model. The model is similar to TRNSYS
Type 201, but implemented in IDA ICE and then modified to allow variable mass flows and to handle the difficulties caused by rampant polynomials. As overall result, deviations between 1 % and 27 % are seen on monthly basis, with simulations usually resulting in higher values when compared to field monitoring results. The overall result appears as convincing, taking
into account typical inaccuracies of laboratory and field tests as well as tolerances during heat pump production.