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Re: [EnergyPlus_Support] Coil:Cooling:DX:SingleSpeed - Flow Rate to Rated Total Capacity
From the Input Output Reference document:
Coil:Cooling:DX:SingleSpeed
The rated air volume flow rate should be between .00004027 m^3 /s and
.00006041 m^3 /s per watt of rated total cooling capacity (300 to 450
cfm/ton).
The values I gave are the limits that are checked during the simulation.
Richard Raustad wrote:
> The DX Coil model assumes the air flow per rated cooling capacity is
> within a certain range. Manufacturers typically operate within this
> range. Look at the air flow rate and capacity for the DX coil. Make
> sure the air flow per capacity is within the range of 0.00002684 -
> 0.00006713 (m3/W). Or 200 cfm/ton - 500 cfm/ton.
>
> AirFlowPerCapacityRatio (m3/W) = Rated Air Flow Rate (m3) / Rated
> Total Cooling Capacity (W)
>
> I typically choose to operate between 0.00004 - 0.00005 m3/W. Approx
> 300 - 400 cfm/ton.
>
> khaysepro wrote:
>>
>>
>> I am trying to model an existing system to verify energy usage for a
>> LEED project. I am getting a severe error when I run the model
>> because the cooling capacity is sized for a design peak load
>> condition that does not exist in actual usage. Design airflow and
>> cooling capacity was calculated by a commercial load estimating
>> software package that apparently does not model DX coils a rigorously
>> as E+. Is there away a to work around the airflow per cooling
>> capacity limits for this type of coil?
>>
>>
>
--
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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