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ASHRAE OR-16-C046

Coupling PV/T Collectors with a Ground-Source Heat Pump System in a Double U-tube Borehole

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Organization: ASHRAE
Publication Date: 1 January 2016
Status: active
Page Count: 8
scope:

This paper examines the possibility of using a double U-tube borehole as a heat exchanger between two independent circuits. One U-tube is linked to a 10 m2 unglazed photovoltaic-thermal (PV/T) collector and the other to a water-to-water heat pump. The objective of the paper is to quantify the benefits of this proposed system on the seasonal performance factors (SPF) of a ground-source heat pump system used for space heating and domestic water heating of a house located in a northern climate. Results show that the proposed system provides 7.7% more electricity than an uncoupled system because the PV/T panels are cooled by the heat transfer fluid from the borehole. However, 81 kWh per year of energy is required to pump this fluid. The heat transferred from the PV/T panels to the borehole increases the average inlet temperature to the heat pump by about 1.5°C which translates into better coefficients of performance (COP) for the heat pump. However, the COP is not the best metric and SPFs, which include pumping energy, represent a better performance indicator. It is shown that the global value of the SPF increases from 2.82 to 2.88 when the reference system and the proposed system are compared.

Document History

ASHRAE OR-16-C046
January 1, 2016
Coupling PV/T Collectors with a Ground-Source Heat Pump System in a Double U-tube Borehole
This paper examines the possibility of using a double U-tube borehole as a heat exchanger between two independent circuits. One U-tube is linked to a 10 m2 unglazed photovoltaic-thermal (PV/T)...
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