Performance and Optimization for a Ground-Coupled Liquid Loop Heat Recovery Ventilation System |
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| Authors: | ZHOU Ya-su Per FAHLEN Torbjrn LINDHOLM |
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| Institution: | 1. Department of Building Environment and Equipment Engineering,Donghua University,Shanghai201620,China
2. Department of Building Services Engineering,Chalmers University of Technology,SE-412 96,Gothenburg,Sueden |
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| Abstract: | Ground-coupled heat pumps(GCHP) arecommonly used in residential heating system. To mitigatethe boreholes temperature dropping with operating time, anew exhaust-air recharging system is developed. The newrecharging system can be used in three operational modes.In this paper, a ground-coupled heat recovery ventilation(HRV) model is discussed. A thermal model is set up tofind the optimal brine flow rate and heat transfer allocationratio between exhaust and supply coils for maximum heatrecovery efficiency. Contrary to the conventional liquid-loopHRV systems, the brine temperature entering the exhaustcoil never goes blow zero(0℃), and hence defrosting isneedless in the ground-coupled HRV system. This can makethe ground-coupled HRV system over 20% more efficientthan a conventional HRV system at low outdoortemperatures. |
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| Keywords: | a ground-coupled HRV system thermal model heat recovery efficiency coils allocation ratio brineflow rate |
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