Design And Optimization Of A Heating Only Heat Pump For Western Pacific Northwest Applications
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Design and Optimization of a Heating-only Heat Pump for Western Pacific Northwest Applications
Author | : Donald Francis Elger |
Publisher | : |
Total Pages | : 252 |
Release | : 1982 |
Genre | : Heat pumps |
ISBN | : |
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The use of the conventional air-source heat pump for residential space conditioning has increased dramatically over the past decade. Historically these units have been designed as air conditioners which could also be used to provide heating. However, for the climatic region of the Western Pacific Northwest (the geographic region west of the Cascade Moutains), there is very little need for air conditioning. Furthermore, for energy conservation and reliability reasons, it would be advantageous to design a heat pump which could only be used for heating. The design presented in this thesis is for such a heating-only heat pump. The intended application is residential space heating in a climatic region exemplified by the Western Pacific Northwest. The fundamental design philosophy was to maximize the energetic efficiency of an air-to-air heat pump while constraining the first cost to a value which is comparable with present commercial heat pumps. This was begun by configuring standard off-the-shelf components in a fashion which, based on the available literature, appeared to be the best for heating-only use. Then this configuration was modeled and extensively evaluated in an effort to achieve an optimum design. This optimization was performed by modeling the heat pump on a detailed heat pump simulation code and coupling this model with a nonlinear optimization algorithm. The predicted performance of the final design is significantly higher than that of presently available heat pump units. On a steady state basis, the COPH is 3.79 at 8.3 ° C (47 °F); this is 35% higher than that of a typical commercial heat pump. On a seasonal basis the proposed design is predicted to use 67% less energy than an electric resistance heating system and 31% to 47% less electrical energy than a typical commercial unit. Because the expected first cost of the heating-only unit is comparable with present commercial units, the economic desirability of this unit is expected to be good.
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