Re: [EnergyPlus_Support] Solar Collectors

[ken young <kennethjyoung@xxxxxxxxx>]

Edwin-

A typical solar thermal hot water system would rely on a gas burner or electric element in the tank to reach the storage tank set point temperature when the solar thermal collector is not able to produce hot water (ie dusk to dawn).  Maybe this is the load your reading in column AA.

--- On Tue, 5/26/09, ebcox <ebcox@xxxxxxxxx> wrote:

From: ebcox <ebcox@xxxxxxxxx>
Subject: [EnergyPlus_Support] Solar Collectors
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Date: Tuesday, May 26, 2009, 1:03 PM

I have a question about the SolarCollectorFlate PlateWater example.

I ran it unaltered with the Chicago O'Hare TMY2 .epw weather file. I read the .CSV output into Excel and I'm comparing column L (STORAGE TANK:Water Heater Source Rate) against column AA (Collector1: Solar Collector Heat Transfer Rate) multiplied by 6 (there are 6 collectors). The value for timestep July 01, 8:30 AM is 6620 for the former, 3770 for the latter. Going forward through the time steps, the values become fairly close but not nearly identical.

I would expect from conservation of energy that the heat energy going into the tank would equal the heat energy leaving the collectors. What do I not understand about Energy Plus?

Thanks!

Edwin Cox

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