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# Temperature rise in water Circuit

## Temperature rise in water Circuit

(OP)
we have a closed-loop water system used as a secondary coolant system cooled by the primary refrigeration system using R404a refrigerant. the temperature rise in the water system is 1 deg C. Max flow is 40lpm, motor is 1.1 KW 220 V 4.8 Amp 50Hz single phase. The pump is a multistage centrifugal type. How it is possible to the addition of that much of heat into the system?

### RE: Temperature rise in water Circuit

What's the volume of the loop, the time to record 1°C of rise, where is temperature being measured, how accurate is the measurement device, what temperature is the loop normally cooled to, what is the loop connected to such as heat exchangers, what is the ambient temperature of where the loop is situated, is the chiller operating correctly and actively cooling this loop, is the chiller sized correctly, are the pipes insulated, does any of the pipe pass through warm areas such as sunlight or areas of the facility where heat is generated?

Lots of factors that are a total mystery to anyone that would even begin to try and answer your question. I'm sure I could come up with several more.

Are you saying that your loop is generating more heat than can be removed by the chiller? And you're saying the pump is the only item adding heat to the system?

### RE: Temperature rise in water Circuit

Could you set a diagram with process data to understand what you're looking for.

Horacio

### RE: Temperature rise in water Circuit

That appears to be quite a high pressure pump, maybe 10bar?

In a closed system all the pump energy ends up in the fluid door to friction.

But time and the closed loop nature of the system has a lot to do with it as well.

40l/min should need 2.6kW to raise it 1C

Maybe your temp guage isn't accurate enough to see smaller changes?

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