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pipeit Power-User Join Date: Dec 2007 Posts: 142 Good Answers: 1	HVAC Reheat 03/12/2012 10:00 AM
	We are in the process of bringing on a new Central Utility Plant that we built over the winter adjacent to a hospital replacing the old C.U.P. (Chilled,Hot water and Steam) The question I have is, I am thinking the best time to make the Hot Water tie ins into the existing system is during when the temperatures are between 40 and 65 degrees F rather then above those temperature's. My logic is above 65F spaces will be in a cooling and dehumidifying mode and the heat during that time will need to be used to re-heat (Via VAV's) the air discharge in those spaces, does this logic make since? Thanks PI
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SolarEagle Guru Join Date: Mar 2007 Location: by the beach in Florida Posts: 33392 Good Answers: 1817	#1 Re: HVAC Reheat 03/12/2012 7:04 PM
	Sounds good to me... __________________ All living things seek to control their own destiny....this is the purpose of life
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YWROADRUNNER Guru Join Date: Dec 2007 Location: Cypress Calif Posts: 741 Good Answers: 23	#2 Re: HVAC Reheat 03/12/2012 7:52 PM
	Personally I would be more concerned with keeping the building warm in the temperature range you suggest. With the proliferation of electronic and electrical devices there is sufficient load in most buildings and situations that dehumidification is sufficiently accomplished in the normal cooling of the building. Of course this is not the case for high spec labs. Without knowing more I would think at most there would only be a few areas in the normal hospital environment that would require a degree of humidity control that necessitates reheat. __________________ "The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man" George Shaw
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Ried Guru Join Date: Dec 2005 Posts: 1602 Good Answers: 19	#3 Re: HVAC Reheat 03/12/2012 11:54 PM
	If the system designer is still around and on speaking terms, ask him the same question. In theory he may had done energy studies and could predict which systems have HW flows at which outdoor air temperatures. The design energy studies might have info on which temperatures would minimize occupant discomfort during the change over to the new system. Send an RFI to the designer. Worst that could happen is you're stuck with the advice from perfect strangers! BTW, I do think your assumption is reasonable, but the designer should have an interest in helping you make a smooth transition to the new CUP. __________________ Eventually, one needs to realize that it is far less important to be the smartest person in the room than it is to sit next to that person and make friends.
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Ried (1); SolarEagle (1); YWROADRUNNER (1)

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