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Thanks for the clarification, EdStainless.

Dear all, Can anyone clarify what does the term type testing for pumps mean? The technical specifications for the pumps read as "All the pump models offered shall be type tested on the particular model". Thanks.

Hi, While selecting the low flow bypass valve across the chiller to bypass the chilled water at low load conditions, which of the following should be considered as the close-off pressure for the valve selection? 1) The pressure developed by the chilled water pump at its minimum speed? or 2) The...

Dear tys90, Thanks. From my reply above, I understand that the temperature at which CHW and air becomes same is 17.5C and hence there cannot be any heat transfer beyond this. This could be the determining factor of how low a CRAC/AHU can supply. Agree? Regarding your point on efficiency at...

Dear ChasBean1, Thanks for your reply. I understood your point. In order to cool the air at 19C to 11C, I need to supply CHW at 3C. The equilibrium in air and water side will be reached at 11C. Right? But how does this apply when the CHWS/R is at 10C/17C and return air/supply air are at...

Dear SAK9, I missed the point that we cannot cool the air to 9C when the water is supplied at 10C. Thanks for bringing up this basic principle. You have mentioned that to cool the air to 11C, we will need coil of infinite size. Is that right? After going through ChasBean1's response, I realize...

Dear engineers, For one of my projects, the vendor has selected a computer room air-conditioning unit (CRAC). The selection parameters are as below: Supply air temperature from the unit = 19 deg C Return air temperature to the unit = 30 deg C Net sensible cooling capacity = 110 kW But, as per...

Hi 317069, Thanks for your reply. In this suggested way of pushing the chillers, will there be any holding/hanging beams required to hang the chillers and push them in? Generally the chiller manufacturer recommends to have a clearance of 1m above the chiller for hoisting. Any idea, is there...

Hi HerrKaLeun, Thanks for your reply. In my project, there are 5 chillers and not all these 5 chillers are installed on the day-1. Initially 2 chillers are installed and later, when the need for air-conditioning load arises, further chillers are added. Also, the roof of the chiller plant room...

Hi, Can anyone advice me how to erect a 1500RT water cooled chiller (around 25,000 kg) in a covered plant room located at the roof slab? I understand that the chillers can be lifted to the roof floor slab using cranes/hoists. But how to move in the chillers into the plant room and how to place...