Recommended Chiller Leaving/Returning Water Temperatures

[EnOm]

Hi,
What are good Chiller Leaving/Returning water temperatures for residential applications? I've seen mostly 42°F LCWT. What about dT?
I know that the best temperatures will require a thorough analysis of the entire system including pumps, piping loop design, fan coil cost, pressure drops..etc, on a case to case basis. But as a rule of thumb, what would be some good values?
Also, and sorry for this show of ignorance, what is meant by "10°F water range in the evaporator"? Is this the dT?

Best Regards

 

[KiwiMace]

The basic chiller specification starts at 42 degF with a dT of 10 degF. Most chillers can be configured to run over a fairly wide range of temperatures, the dT usually stays around 9 - 10 though.

 

[EnOm]

Thank you for the response. I understand. Would you be so kind to answer the part about the 10°F water range? I do know that the evaporator is where the chilling of the water takes place, but maybe this refers to something else? The reason I'm wondering is because the terms I've come across are Delta T, or Water Temperature Rise (WTR). I've not come across this term before.

Regards

 

[MTES93]

I believe the temperature range you mention is the delta T. Can't think of anything else it would be. Often times your CWS temp is dependent on your de-humidification loads. If designing from scratch I would optimize coil/chiller selection for the warmest CWS temperature and highest delta T while still meeting latent and sensible loads. Higher CWS temp means less compressor lift and energy savings. Higher delta T means less flow and pumping energy.

 

[EnOm]

Thank you for the response.

Regards