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Re: [EnergyPlus_Support] Re: Radiant cooling systems
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- Subject: Re: [EnergyPlus_Support] Re: Radiant cooling systems
- From: "srk iitm srk.iitm@xxxxxxxxx [EnergyPlus_Support]" <EnergyPlus_Support@xxxxxxxxxxxxxxx>
- Date: Fri, 9 Feb 2018 07:16:36 +0000 (UTC)
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Dear Ooi
There are two types of heat gains
1) convection heat gain
2) radiant heat gain
Radiant cooling system: radiant heat gain will become the instantaneous load along with convective heat gain which is not the case in conventional (traditional method) cooling system where the radiant heat gain will be stored in the thermal mass and will get released later on.
From: "Ooi Koon Beng ooi_kb3@xxxxxxxxxxxx [EnergyPlus_Support]" <EnergyPlus_Support@xxxxxxxxxxxxxxx>
To: "EnergyPlus_Support@xxxxxxxxxxxxxxx" <EnergyPlus_Support@xxxxxxxxxxxxxxx>
Sent: Thursday, 8 February 2018 4:42 AM
Subject: [EnergyPlus_Support] Re: Radiant cooling systems
EnergyPlus uses Heat Balances, at inner surface, outer surface, for well-mixed indoor air. Is that your 'traditional method"?
Heat balance is done at each time step, could be several times, because of the dynamics/changes of temperatures etc
i have used EnergyPlus LowTempertureRadiant:VariableFlow object for Cooling, using 'high temperature' 25C water
i have also used the same object for low temperature (20C) heating
The simulated indoor air temperatures are reasonable..
i am conducting experiments for low temperature heating in Melbourne and high temperature cooling in Malaysia
So far, high temperature cooling in Malaysia has resulted in condensation on the surfaces of the hydronic tubing, as predicted by EnergyPlus
regards
ooi
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Posted by: srk iitm <srk.iitm@xxxxxxxxx>
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