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Ground-coupled heat pumps(GCHP)are commonly used in residential heating system.To mitigate the boreholes temperature dropping with operating time,a new exhaust-air recharging system is developed.The new recharging 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 to find the optimal brine flow rate and heat transfer allocation ratio between exhaust and supply coils for maximum heat recovery efficiency.Contrary to the conventional liquid-loop HRV systems,the brine temperature entering the exhaust coil never goes blow zero(0℃),and hence defrosting is needless in the ground-coupled HRV system.This can make the ground-coupled HRV system over 20% more efficient than a conventional HRV system at low outdoor temperatures.
Ground-coupled heat pumps (GCHP) are commonly used in residential heating systems. To mitigate the boreholes temperature dropping with operating time, a new exhaust-air recharging system is developed. The new recharging system can be used in three operational modes. paper, a ground-coupled heat recovery ventilation (HRV) model is discussed. A thermal model is set up to find the optimal brine flow rate and heat transfer allocation ratio between exhaust and supply coils for maximum heat recovery efficiency. Contrary to the conventional liquid -loop HRV systems, the brine temperature entering the exhaust coil never goes blow zero (0 ° C), and hence defrosting is needless in the ground-coupled HRV system. this can make the ground-coupled HRV system over 20% more efficient than a conventional HRV system at low outdoor temperatures.