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NC-2009 EAp2:Minimum Energy Performance

MANDATORY REQUIREMENTS AHSRAE 90.1

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Jorge Torres-Coto
Building Systems Commissioning Engineer
Empirical Engineering, LLC
LEEDuser Basic Member
14 thumbs up

Does anyone know if isolation valves on a multiple chiller plant are required by ASHRAE, or they simply best practice? I have looked into this in ASHRAE documents, but have not found anything yet. I do know for a fact that a non-operating chiller will pass water without cooling it and eventually mix with the cooled water leaving the operating chiller producing a mixed chilled water temperature that will be higher than setpoint to the load (proportional to the flows of each chiller). I obviously get resistance from the installing contractors due to monetary issues. Thanks Jorge

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Jean Marais
b.i.g. Bechtold DesignBuilder Expert
LEEDuser Basic Member
581 thumbs up

Thu, 01/26/2017 - 08:39

I can't remember any requirements. The installers should install equipment according to plan. The MEP and Controls planners should have planned everything properly. If a mixed temperature is part of the design, then don't mess with the design as it could have unforseen consequenses. The best practise is to check with the design team if it is an oversight or not. Installing firms are always trying to cut corners to save money and then if anything goes wrong it's the fault of the designers. If it's a design issue or a cost issue, is impossible to say. Perhaps the same investment can save more energy if invested elsewhere. If it is an oversight, then it would have an impact on the overall control of the system and everyone will be happy you picked up on it.

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