[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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