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RE: [EnergyPlus_Support] PV Problems
Mike,
Thanks for your help with this (and all my other) problems!
Michelle Smith
Belle Engineering, LLC
Ph: 314.631.8447
Fx: 314.631.9102
www.belleengineering.com
-----Original Message-----
From: Michael J. Witte [mailto:mjwitte@xxxxxxxx]
Sent: Tuesday, October 01, 2002 2:28 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: Re: [EnergyPlus_Support] PV Problems
There are several problems with the PV simulation in v1.0.2.
1. If more than one PV array is entered, the results for the last PV
array are reported for all arrays. So, until v1.0.3 is released, you
must model only one PV array per idf file. This problem will be
fixed in v1.0.3.
2. There was an error in the EnergyPlus defaults file which is used
by the TRNSYS PV module. This error severely limited the power
output of the PV array. A revised file, Eplus.def, has been posted
in the files area of the EnergyPlus_Support group at
www.yahoogroups.com Download this file and replace the existing one
in EnergyPlus\trnsyspv\.
3. The Input/Output Reference states that the units for Maximum
Inverter Capacity are [kW] while the IDD indicates that they are in
[W]. With v1.0.2 and the revised Eplus.def file, the value will
still be treated as [kW]. But when vesrion 1.0.3 is release, you
will need to increase this value by a factor of 1000 to be in [W].
4. The reported values for PV Array Electric Power Produced[W] and
PV Array Electric Energy Produced[J] are incorrect. For v1.0.2 use
only the values reported for PV Inverter Electric Power Delivered[W]
and PV Inverter Electric Energy Delivered[J]. This will be fixed in
v1.0.3.
Thank you for calling these problems to our attention.
Mike
On 11 Sep 2002, at 22:21, Michelle Smith wrote:
> Finally, has any one else used EnergyPlus to model PV performance? I
> used EnergyPlus and the results just didn't look right to me, so I
> used another program to compare. EnergyPlus wasn't even in the
> ballpark with regard to the energy produced. Additionally, I had two
> arrays of different sizes pointing different directions, and the
> results reported by EnergyPlus were exactly the same for both. Any
> thoughts?
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