Hi,
Would add a water side economizer in a chiller plant cause low delta_T symptom for the chillers? The water side HX is in series with the chiller evaporators, therefore, i am a little worried about low delta_T symptom. Anyone has any experience before?
Thanks a lot!
Hi,
I have a question about retrofitting the constant speed motor with VFD. The piping or duct system head loss design (pump or fan selection) is based on the full load pump or fan curve. When we do add VFD on the pump or fan motor, shouldn't we take a look of the pump or fan curve to make...
Hi guys,
I am working on energy conservation project. This is a dual duct system, the supply fan and return fan motors are all equipped with VFD already. Is it necessary to install VFD on the hot water pumps and chilled water pumps? I do not think it is necessary since the air flow is adjusted...
Hi,
I was reading an HVAC tech sheet and confused by some sentenses in the sheet:
The heating on this unit will be run off discharge air temperature with room temperature override.
It will operate off discharge air temperature with room temperature override.
I guess these two sentenses mean...
Hi,
I have a question on choosing cooling tower or dry cooler. It is required that the cooling tower through the winter season. But it may have some freezing issues. I am thinking separate the sump and locate it indoor and put the cooling tower at the highest point of the building. So, when the...
Hi Guys, I am doing a energy conservation project and trying to add a VFD on the secondary and tertiary pumps in a primary/secondary chilled water system. But I am a little concerned about chiller low delta_T symptom when the cooling load is low in some cool days. Anyone has any experience on...
