Re: [EnergyPlus_Support] Solar Collectors

[ken young <kennethjyoung@xxxxxxxxx>]

collector efficiencies maybe?  Typically 0-80% dependent on the ambient air temp and the temperature of the fluid in the collector.  Maybe EPlus has an algorithm for this.

--- 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

__._,_.___

The primary EnergyPlus web site is found at:
http://www.energyplus.gov

The group web site is:
http://groups.yahoo.com/group/EnergyPlus_Support/

Attachments are not allowed -- please post any files to the appropriate folder in the Files area of the Support Web Site.

EnergyPlus Documentation is searchable.  Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.

Your email settings: Individual Email|Traditional
Change settings via the Web (Yahoo! ID required)
Change settings via email: Switch delivery to Daily Digest | Switch to Fully Featured
Visit Your Group | Yahoo! Groups Terms of Use | Unsubscribe

__,_._,___