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What is typically (or best) to use for water pipe 4", annealed temper or hard drawn temper????

Is there a code requirement for minimum outdoor air for data center(mostly unoccupied)?

Can anyone tell me a simple way to figure out how fast the space temperature will rise based solely on a given constant heat source in the space, ignoring other contributors such as walls.....

HAs anyone experience any water system delta T as high as 50F delta??? Typical one i see is about 15F to 20F at most....The driving force for the delta T, of course, is the load,....i was told that in Europe they have systems that goes as high as 50F delta T.... By process water, i meant the...

Does the control valve CV change when the valve throttle ?? or is it the same Cv ?

i have an application where i need 13,000 cfm for an electrical room with a 42KW heat dissipation. I assumed about 10 degree temperature rise in space for this...is this true? or is it more like 12degF rise. ..so for a 95 Ambient outside, the space inside willbe arounf 105F...?? Also, im...