[Bldg-sim] Modelling service water heater

[R B]

http://www.pnl.gov/main/publications/external/technical_reports/PNNL-16031.pdf

The above paper might have the answer for you (page 35). Let me know if it
works out. I have not really tried it.
-Rohini

On Wed, Sep 24, 2008 at 2:38 PM, Chris Jones <cj at cr-jay.ca> wrote:

> 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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