Systems and methods for non-pressurized closed loop water subsystems for heating, ventilation, and air conditioning systems

A heating, ventilation and air conditioning system includes first and second fluids, a heat exchanger, a refrigerant subsystem, and at least one closed loop subsystem. The heat exchanger includes a membrane for directing a first fluid through the heat exchanger and is arranged for heat transfer between the first fluid and a second fluid. The membrane defines an inlet having an inlet height relative to a reference level. The closed loop subsystem transfers heat from the heat exchanger to the refrigerant subsystem and includes an expansion tank containing a first fluid. The liquid level of the first fluid in the expansion tank has a liquid level height relative to a reference level. The expansion tank is positioned relative to the heat exchanger such that the inlet height is greater than the liquid level height, and the membrane remains in a collapsed configuration. 一种加热、通风和空气调节系统包括第一流体和第二流体、热交换器、制冷剂子系统以及至少一个闭合回路子系统。热交换器包括用于引导第一流体通过热交换器的膜并且设置成用于第一流体与第二流体之间的热传递。该膜限定了具有相对于参考水准面的入口高度的入口。闭合回路子系统将热从热交换器传递到制冷剂子系统，并且包