A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Performance prediction of a hybrid solar ground-source heat pump system
Highlights ► A new hybrid solar GSHP system (HSGSHPS) is designed for heating load far larger than cooling load. ► The performance of HSGSHPS over 25 years is predicted. ► The suitable control strategy and the first-operation time are determined. ► The load circulation pump control strategy can result in much more energy saving.
Abstract This paper presented a novel hybrid solar GSHPS (HSGSHPS) composed of a GSHPS and a solar assisted GSHPS (SAGSHPS) used in an office building for heating and cooling. The key issues of designing the HSGSHPS were introduced and a simulation model was developed in TRNSYS to predict the multi-year performance of this system. The simulated results showed that the proposed HSGSHPS was reasonably designed to resolve the ground temperature imbalance problem on an annual basis. The suitable control strategy for the solar collection and storage was found according to the coefficient of performance (COP) of SAGSHPS. The first-operation time has impact on the operation of SAGSHP and GSHPS. Injection of thermal energy into the borehole heat exchanger (BHE) or borehole thermal energy storage (BTES) before the heat extraction from BHE/BTES was favourable to the overall COP of system. It is very important to SAGSHPS to store sufficient solar thermal energy in the BTES because of its small spacing between boreholes. 32% of the electrical energy consumption in the HSGSHPS could be saved if the load circulation pump was turned off when no fan-coil was running, rather than always keeping it running at all times.
Performance prediction of a hybrid solar ground-source heat pump system
Highlights ► A new hybrid solar GSHP system (HSGSHPS) is designed for heating load far larger than cooling load. ► The performance of HSGSHPS over 25 years is predicted. ► The suitable control strategy and the first-operation time are determined. ► The load circulation pump control strategy can result in much more energy saving.
Abstract This paper presented a novel hybrid solar GSHPS (HSGSHPS) composed of a GSHPS and a solar assisted GSHPS (SAGSHPS) used in an office building for heating and cooling. The key issues of designing the HSGSHPS were introduced and a simulation model was developed in TRNSYS to predict the multi-year performance of this system. The simulated results showed that the proposed HSGSHPS was reasonably designed to resolve the ground temperature imbalance problem on an annual basis. The suitable control strategy for the solar collection and storage was found according to the coefficient of performance (COP) of SAGSHPS. The first-operation time has impact on the operation of SAGSHP and GSHPS. Injection of thermal energy into the borehole heat exchanger (BHE) or borehole thermal energy storage (BTES) before the heat extraction from BHE/BTES was favourable to the overall COP of system. It is very important to SAGSHPS to store sufficient solar thermal energy in the BTES because of its small spacing between boreholes. 32% of the electrical energy consumption in the HSGSHPS could be saved if the load circulation pump was turned off when no fan-coil was running, rather than always keeping it running at all times.
Performance prediction of a hybrid solar ground-source heat pump system
Wang, Enyu (author) / Fung, Alan S. (author) / Qi, Chengying (author) / Leong, Wey H. (author)
Energy and Buildings ; 47 ; 600-611
2011-12-24
12 pages
Article (Journal)
Electronic Resource
English
Performance prediction of a hybrid solar ground-source heat pump system
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