In contrast, in case of expansion valve, at specific heat
source temperature, the mass flow rate of the CRC tends to
decrease with increasing heat sink temperature. This is
because expansion valve is a kind of variable area devices
controlling the flow of liquid refrigerant to the evaporator.
For example, if the cooling load decreases, pressure at the
inlet of expansion valve decreases and thereby repositions
the valve closing to allow a smaller amount of liquid
refrigerant to enter the evaporator. In the present work, the
experimental results show that Qevap decrease with increasing
heat sink temperature. Therefore, it can be concluded
that for the CRC, the increasing heat sink temperature
causes the refrigerant mass flow rate to decrease. Moreover,
at the same heat sink temperature, the mass flow rates at
higher heat source temperature are higher than at lower ones
across the range of heat sink temperatures.