Hi guys ,
take a look at this diagram . It shows the refrigeration in the cooling mode. I understand that the refrigerant flows from the expansion valve to the evaporator in cooling mode. But what about heating mode ? How will it flow in the reverse direction ie in the heat mode , would the refrigerant flow from the compressor to the evaporator and then to the expansion valves in the diagram , but the refrigerant can only flow from the expansion valve to the evaporator and not the other way ?