[Equest-users] 90.1-2007 Table 7.8 Water Heater Efficiencies
Paul Diglio
paul.diglio at sbcglobal.net
Tue Oct 4 04:37:07 PDT 2011
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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