R134a Low Subcooling, High Superheat

[yash7]

The cooler cuts off as the water cooler is designed to make sure that water temperature doesn't drop below 7 deg. C. The users don't prefer water colder than that.

[Gary]

The cooler cuts off as the water cooler is designed to make sure that water temperature doesn't drop below 7 deg. C. The users don't prefer water colder than that.

Throughout this thread you have said there is a problem. The system pulls down to the desired temperature and shuts off. So, where do you see a problem? What problem?

[yash7]

Throughout this thread you have said there is a problem. The system pulls down to the desired temperature and shuts off. So, where do you see a problem? What problem?

The problem is actually the COP. It is very less. The compressor is consuming about 100 W and the rate of cooling is very slow. The average cooling capacity is about 62 W and it took nearly 25 mins to pull down the temperature from 35 to 7 degrees C (0.8L water). As per the compressors' datasheet, for 54.4 deg. C condenser temperature, and -10 degrees C evaporator temperature, the power consumption is 100 W and the capacity is 135W. I had expected that at nearly the same condenser temperature, and higher evaporator temperature, the capacity should be even higher and that low/no subcooling, and the subsequent reduction in flow rate by the throttling device are lowering the capacity. Where am I going wrong?