[Bldg-sim] Modelling service water heater

Chris Jones cj at cr-jay.ca
Wed Sep 24 11:38:41 PDT 2008


This question is about setting the efficiency of the budget case 
domestic hot water heater for modelling purposes.  In 90.1-2004, 
Section 11.3.2 (b) is states "All HVAC and service water heating 
equipment in the budget building shall be modeled at the minimum 
efficiency levels, both part load and full load, in accordance with 
6.4 and 7.4.

7.4 refers to Table 7.8.  A small gas heated storage tank has an 
efficiency of 0.62-0.0019V EF.  Where EF is the energy factor.  From 
what I can find there is no single formula to convert EF to thermal 
efficiency.  So what would you model the budget case efficiency at in 
DOE2.1e for this example?

Thanks for any insight you can give.







Chris Jones, P.Eng.
14 Oneida Avenue
Toronto, ON M5J2E3
Tel. 416 203-7465
Fax. 416 946-1005 
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