[Equest-users] 90.1-2007 Table 7.8 Water Heater Efficiencies
Paul Diglio
paul.diglio at sbcglobal.net
Wed Oct 5 10:57:55 PDT 2011
Thanks Kushagra & Nick.
Paul Diglio
________________________________
From: Nick Caton <ncaton at smithboucher.com>
To: Kushagra Juneja <kce4 at kamalcogentenergy.com>; Paul Diglio
<paul.diglio at sbcglobal.net>; equest-users at lists.onebuilding.org
Sent: Wed, October 5, 2011 9:40:19 AM
Subject: RE: [Equest-users] 90.1-2007 Table 7.8 Water Heater Efficiencies
Note: Forwarded message is attached.
I expect the natural followup is “how do I put this (SL) into eQuest?”
Attached thread spells out how you start with SL and arrive at UA. Also
includes an example with the electric heater equation.
~Nick
NICK CATON, P.E.
SENIOR ENGINEER
Smith & Boucher Engineers
25501 west valley parkway, suite 200
olathe, ks 66061
direct 913.344.0036
fax 913.345.0617
www.smithboucher.com
From:equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Kushagra Juneja
Sent: Wednesday, October 05, 2011 12:13 AM
To: 'Paul Diglio'; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] 90.1-2007 Table 7.8 Water Heater Efficiencies
Hi Paul,
There are two things being talked about, one is thermal efficiency and the other
is standby loss. Standby loss represented as (Q/800+110 SqRt V) and thermal
efficiency represented as 80%. I had the same doubt a while back. If you look at
other Formulae they are represented in the same way. Like for instantaneous
water heaters Energy Factor is given by 0.62-0.0019V. Btu/h is the unit for
Standby Loss. Not a multiplication factor. Hope this helps.
Cheers
Kushagra
________________________________
From:equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Paul Diglio
Sent: Tuesday, October 04, 2011 5:07 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] 90.1-2007 Table 7.8 Water Heater Efficiencies
Could anyone help me understand the calculation for the minimum efficiency of
gas storage water heaters per the table above?
The calculation is 80%Et (Q/800+110 SqRt V) SL, Btuh.
I understand that Q is the nameplate input rate in Btuh and V is the volume.
Do I use the volume of the whole system, the storage tank only or the recovery
rate volume?
I understand SL is the standby loss. Does SL, Btuh mean multiply the equation
in parenthesis by the standby loss in btu's per hour?
Thanks for the help,
Paul Diglio
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