Patent
Refrigeration circuit for heat pump water heater and control therefor
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TLDR
In this paper, a refrigeration circuit is described which is operable in each of four distinct modes for the heating or cooling of a space, the production of a heated liquid, or the simultaneous cooling of the space and production of heated liquid.Abstract:
A refrigeration circuit is disclosed which is operable in each of four distinct modes for the heating or cooling of a space, the production of a heated liquid, or the simultaneous cooling of a space and production of heated liquid. The circuit includes compressor means; indoor, outdoor, and liquid heat exchange means; along with vapor conduit means including first valve means and liquid conduit means including second valve means so as to afford selective operation of the circuit in any one of the aforementioned modes. A significant feature of the invention lies in the fact that, during operation in any particular mode, the inactive heat exchange means of the circuit is vented to the suction side of the compressor means so as to afford proper refrigerant charge control within the circuit. Control means are further disclosed which sense the load imposed upon the compressor means and prevent overloading thereof during operation in a water heating mode.read more
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References
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Patent
Heat pump system
TL;DR: In this paper, a reversible vapor compression system having control means associated therewith for automatically routing refrigerant through the heat exchangers in response to a system mode of operation to produce optimum system performance when the system is called upon to produce either heating or cooling.
Patent
Heat reclaim for refrigeration systems
TL;DR: In this article, a control valve arrangement for determining which of the two condensers is to be operative for rejecting heat and which of them to be inoperative is presented, which includes control valves in the outlet conduit of each condenser arranged so that when one is open, the other is closed.