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RE: [EnergyPlus_Support] RE: Night cycle Operation
Fabiano,
Make sure that coil availability is always “ON”. Only the fan needs to have a schedule.
James V Dirkes II, PE, BEMP, LEED AP
<http://www.buildingperformanceteam.com/>www.buildingperformanceteam.com
Energy Analysis, Commissioning & Training Services
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From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of fabianoferreira27@xxxxxxxxxxx
Sent: Thursday, February 13, 2014 6:12 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: Re: [EnergyPlus_Support] RE: Night cycle Operation
Hello Jean,�thanks for your response!
My fan is operating properly during unoccupied hours. My problem is that I've noticed if the cooling system doesn't operate during setback high temperatures the fan alone will never maintain the temperature in the zone. So should the cooling or heating coil operate during setback temperatures? If so, how should I set them to work?
Thanks,�
Fabiano Ferreira
---In <mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx>EnergyPlus_Support@xxxxxxxxxxxxxxx, <<mailto:jeannieboef@...>jeannieboef@...> wrote:
Good question. EnergyPlus, I believe is clever enough not to let the cooling/heating coils run if the fan is off, so just worry about the fan. you want the fan to cycle to meet loads during unoccupied times and to be constantly on during occupation. So one way with nightmanager is to schedule your fans to on during occupied hours and off during unoccupied hours. nightmanager overrides the off during non-occupied hours to on, when the temperature sinks below the set threshold. be sure to schedule the availability of when nightmanager may override the fan schedule so that nightmanager only operates during non-occupied hours, else it will hassle your controls during occupied hours.
Jean
PS the other way applies to unitary equipment...I've not elaborated on the other way.
2014-02-12 18:36 GMT+01:00 <<mailto:fabianoferreira27@...>fabianoferreira27@...>:
> �
> Hello everyone,
> �
> Sorry, but I still got a doubt about the Nighcycle operation. According to the item G3.1.2.4Fan System Operation, “� fans shall operate continuously whenever tthe spaces are occupied and shall cycled to meet heating and cooling loads during unoccupied hours�”
> �
> My doubt is, only the fan should operate to meet unoccupied setback temperatures, or the cooling and heating coil should operate with the fan?
> I’ve set the fan to operate, the result is that the fan will never meet the unoccupied setback high temperatures. Instead of maintaining the zone temperature, without cooling coil operating, the fan will increase the temperature in the zone.
> �
> If the cooling and heating system should operate during setback temperatures, how do I set them to work properly? Do I have to use two setpoint temperatures for cooling and heating mode, i.e., 24ºC for occupied hours and 32ºC for setback temperature during cooling mode and the same for heating?
> �
> �
> �
> Thank you,
> �
> Fabiano Ferreira
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