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Re: [EnergyPlus_Support] Simulation using HVAC Template with Reheat and Humidity Control
Not that this will make any difference in your simulation, but the size
of the reheat coil only needs to be equal to or slightly greater than
the cooling coil's SENSIBLE capacity. Sensible capacity is equal to
Total Cooling Capacity * SHR. So in your case that means 6200 W * 0.64 =
3968 W. In the HVAC template the heating coil and reheat coil are sized
with the HVAC Template Heating Coil Capacity input, so as long as you do
not need more than 3968W for heating, then you can size the reheat coil
as low as 3968 W. This does not mean you will need a reheat coil of that
size, it simply means it is a good place to start. You can check the
reheat coil output after the simulation is complete to see what maximum
reheating capacity is required.
Richard Raustad wrote:
> The heating.reheat coil does not have enough capacity. You have
> specified 0.45 W. I changed the heating/reheat coil capacity to be as
> large as the cooling coil capacity and it worked much better. Keep in
> mind that when the zone moisture load is greater than the cooling
> coil's latent capacity, the zone RH.will rise above the humidity set
> point and a larger coil will be required.
>
> Your file:
> HVACTemplate:System:Unitary,
> 6200, !- Cooling Coil Capacity {W}
> 0.45, !- Heating Coil Capacity {W}
>
> Corrected file:
> HVACTemplate:System:Unitary,
> 6200, !- Cooling Coil Capacity {W}
> 6200, !- Heating Coil Capacity {W}
>
>
> Abdul Murad Zainal Abidin wrote:
>>
>> Hello,
>>
>> I am in need of a kind assistance from anybody regarding my
>> simulation. I have tried using HVAC Template for unitary system using
>> reheat. My intention is to control the zone conditions at 24 deg C
>> and 55 to 60% relative humidity. The HVAC system is using 100% fresh
>> air and will be fully extracted. I am still unable to get the
>> relative humidity constant and the reheat coil is not functioning.
>> Attached is my input file. Am I missing something, or lots of things?
>>
>> Thank you for reading.
>>
>> Murad
>>
>>
>
--
Richard A. Raustad
Senior Research Engineer
Florida Solar Energy Center
University of Central Florida
1679 Clearlake Road
Cocoa, FL 32922-5703
Phone: (321) 638-1454
Fax: (321) 638-1439 or 1010
Visit our web site at: http://www.fsec.ucf.edu
UCF - From Promise to Prominence: Celebrating 40 Years
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