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Andrew,<br>
<br>
It is probably incorrect to baseline the instantaneous water heater
using the current minimum efficiency standard for the residential size
gas instantaneous water heaters (EF=0.62). According to GAMA's
Consumer's Directory of Certified Efficiency Ratings for Heating and
Water Heating Equipment's directory, very few gas instantaneous water
heater models have EF below 0.80.<br>
<br>
Alex Lekov, Ph.D., P.E.<br>
office 925-486-6849<br>
<br>
<br>
Andrew McNamara wrote:
<blockquote
cite="midfa4b841d0801080913r6b150b6dq4f3d7ae49fdd2915@mail.gmail.com"
type="cite">Hello all,<br>
<br>
I am modeling a building with eQUEST that has a
tankless, a.k.a. instantaneous, gas-fired hot water heater. I am
uncertain of how to baseline the system according to ASHRAE 90.1-2004
Appendix G. The standard states that for a 180,000 BTU/h system the EF
(Energy Factor) = 0.62-0.0019V. So, I set V equal to zero for the
tankless/instantaneous gas water heater and get an EF =0.62. <br>
<br>
The question I have for everyone is: How do I translate this baseline
EF to HIR (Heat-input-ratio) for eQUEST? Is there an accepted method
for doing so? I saw in a previous post from David Eldridge on 3/21/07
that
calculating HIR = 1/EF leads to unreasonably high values for HIR (In my
example, 1/0.62 = 1.61), but I'm having trouble seeing how else to come
up with a baseline.<br>
<br>
Thanks in advance for your help.<br>
<br>
Best,<br>
Andy<br clear="all">
<br>
-- <br>
Andrew McNamara, LEED AP<br>
tel: 212.803.5868<br>
fax: 866.379.8026<br>
cell: 917.974.4499
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