INVESTIGATION OF PV/THERMAL COLLECTOR MODELS FOR USE WITH GROUND SOURCE HEAT PUMPS IN TRANSIENTSIMULATIONS

摘要

Photovoltaic-thermal (PVT) collectors are commonly designed for use in domestic hot water systems, howeverrnit can be interesting to incorporate them into ground source heat pump (GSHP) systems. Because of thernhistorically narrow use case, many PVT models are created with a collection of assumptions which may notrnapply to novel collectors designed for use in PVT+GSHP systems. The aims of this study are to review existingrnPVT collector models for use in TRNSYS, identify any potential error sources, and test for possiblernimprovements. Type 560 is found to be the most promising theoretical model, however two potentially limitingrnfeatures are identified; the radiation absorption model and the confinement to sheet-and-tube configurations.rnThe absorption is tested using a recreation of Type 560 in Matlab where two alternative models developedrnspecifically for PV modules are compared. The results show a marked increase in power during low angle, lowrnlight hours, and a 14.36% increase in electrical energy and a 10.91% for the thermal energy over the course of arnday with one of the models. Collector geometry is tested by creating a 1D model in EES and comparing it tornseveral geometries in Type 560. A method of packing as many tubes as possible together is shown to giverncomparable results as the 1D model. The results of these simulations will be compared with empirical data fromrncurrently ongoing testing.