[BLDG-SIM] Inlet water temperatures

Jeff Haberl jeffhaberl at tees.tamus.edu
Wed Jun 29 15:50:51 PDT 2005


Most cities record their water supply temps, which can be helpful. Otherwise this issue is currently a research topic for ASHRAE's TC 4.2. 

Jeff
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Jeff S. Haberl, Ph.D., P.E.............................jhaberl at esl.tamu.edu

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-----Original Message-----
From: postman at gard.com <postman at gard.com>
To: BLDG-SIM at gard.com <BLDG-SIM at gard.com>
Sent: Wed Jun 29 13:26:27 2005
Subject: [BLDG-SIM] Inlet water temperatures

For the purposes of modeling residential water heating energy use, 
can anyone suggest a source for annual average water inlet temps 
(from the municipal water system)? 
I've been using the annual average outdoor dry-bulb (offset by a few degrees) 
or estimated shallow ground temperatures in the TMY2 files, but these don't 
seem to give plausible values in cold climates like Alaska 
(annual averages are well below freezing, even at 4m depth). 
(a related question might be how they get piped water in places with ground 
temperatures that low). 

thanks, 
Rich Brown 
--------------------------------------------------------------- 
Rich Brown * REBrown at lbl.gov 
Energy Analysis Department * Phone: (510) 486-5896 
Lawrence Berkeley National Laboratory * Fax: (510) 486-4247 
---------------------------------------------------------------


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