| 摘要 |
A selectively controllable valve (106) is arranged in a refrigeration circuit which interconnects the evaporator (102) and the condenser (100) and is controlled so that a pressure differential is built up across the valve (106). The valve (106) is selectively opened to allow "batches" of working fluid to pass therethrough. In some embodiments, the working fluid which is allowed to pass through the valve (106), is heated in a chamber (116) to increase the amount of pressure on the downstream side of the valve (106). This produces expanded pressurized working fluid which increases the pressure in the condenser (100) and forces previously condensed and liquefied working fluid through a flow restricting transfer device (104) into an evaporator (102). In other embodiments, the pressure differential is produced and/or augmented by a pump (102) such as a piston pump, or a combination of the pump (102) and the heating chamber (116).
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