If a bivalent heat pump unit serving a water-based circuit (that heats and cools an office) is working between evaporating at 5°C and condensing at 45°C, from a refrigerant condition point of view, how quickly can this unit be turned off?
The reason behind the question is building-grid interoperability when at times of grid congestion heat pumps can be turned off. I am wondering if the refrigerant operates between the temperature points outlined above, it might be necessary to run the heat pump for few seconds to allow the refrigerant to settle or move back from a super critical state (?) where otherwise and with a sudden shut-down the heat pump might be damaged.
Any advice or source of info would be great.
Try to make the evaporating temperature and condensation temperature close. For experimental rig, you can recover the condensation heat to evaporator. Then I think it may turn off quickly.
Hi Long
The evaporating and condensing temperatures are fixed because they meet building HVAC demands.
Hi Mohammad,
In this case, it is better to adjust the control valve which is installed according to the expanded valve. Try to balance the system pressure.
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