A heat pump system that harvests multiple kinds of renewable energy to meet various heating and cooling demands in a building is under development. The system consists of ground heat exchangers, a unique sky-source heat pump, and various water-source heat pumps for heating and cooling purposes. All are connected to a water circulating loop to form a thermal network. By two-stage heat pump system configuration, the ground works as a thermal energy storage medium as well as a heat source. The ground heat exchange benefits as storage gain and its amount is numerically predicted.
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