The combination heat supply System of heat pump with multi-heat source and solar energy, chief technical parameters of equipments, heat engineering properties of heat pump with multi-heat source, and experiment results of drying lumber with heat pump or heat pump-solar energy were presented. The experiment results show that the properties of heat pump with multi-heat source are better than that with one source, the heat supply effect of heat pump for energy saving is better than that of vapor when the temperature is higher than a certain level, and the combination heat supply effect of energy saving with heat pump -solar energy is higher than heat pump.
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