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Firstly, the performance of CHU for generating hot water is tested in the air source heat pump mode.
It converts hydraulic energy to mechanical energy when operating in motor mode, and mechanical energy to hydraulic energy while operating in pump mode.
The NOPO model has consists of three modes, the signal and idler modes (alpha_{s}), (alpha_{i}) and the pump mode (alpha_{p}).
Open image in new window Fig. 20 Cross-section view of micropump Open image in new window Fig. 21 Diagrams of operational principle in supply and pump mode.
The present paper analyzed the inner flow characteristic of a reversible pump-turbine at pump mode with the optimal guide vane opening.
And then the potential is transformed into cold or heat energy by absorption refrigeration or heat pump mode when the consumers need the cold or heat energy.
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The two modes of AS-PSH operation presented in this paper are turbine and pump modes.
Furthermore, experiments are executed on the air source and water source heat pump modes, respectively, to test the operation performance in winter conditions.
The correction factors of flow rate, head, hydraulic efficiency and impeller theoretical head in both turbine and pump modes are correlated to impeller Reynolds number by a three-parameter-power function.
HPSAHP operates in heat-pump mode when solar radiation is low and in heat-pipe mode without electricity consumption when solar radiation is high.
An outdoor test for a HPSAHP in the present study has shown that COP of the hybrid-mode operation can reach 3.32, an increase of 28.7% as compared to the heat-pump mode COP (2.58).
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