| 摘要 |
<p>A vapor compression system (10) includes an evaporator (16), a compressor (12), and a condenser (14) interconnected in a closed-loop system. In one embodiment, a multifunctional valve (18) is configured to receive a liquefied heat transfer fluid from the condenser (14) and a hot vapor from the compressor (12). A saturated vapor line connects the outlet of the multifunctional valve (18) to the inlet of the evaporator (16) and is sized so as to substantially convert the heat transfer fluid existing the multifunctional valve (18) into a saturated vapor prior to delivery to the evaporator (16). The multifunctional valve (18) regulates the flow of heat transfer fluid through the valve (18) by monitoring the temperature of the heat transfer fluid returning to the compressor (12) through a suction line (30) coupling the outlet of the evaporator (16) to the inlet of the compressor (12). Separate gated passageways within the multifunctional valve (18) permit the refrigeration system to be operated in defrost mode by flowing hot vapor through the saturated vapor line (28) and the evaporator (16) in a forward-flow process thereby reducing the amount of time necessary to defrost the system and improving the overall system performance.</p> |
