[Bldg-sim] eQuest domestic hot water energy consumption

[John Aulbach]

It would be easier to see you .PD2 and .INP file. How do we know your space 
heating is correct?

John Aulbach




________________________________
From: Maudud Quazi <tauhid80 at gmail.com>
To: bldg-sim at lists.onebuilding.org
Cc: f.rad at cleanenergy.ca
Sent: Sun, November 21, 2010 10:51:29 AM
Subject: [Bldg-sim] eQuest domestic hot water energy consumption


Hello all,

Hopefully most of you have experience with modelling domestic hot water system 
in eQuest.  First of all, according to Natural Resource Canada, the annual 
Domestic Hot Water (DHW) heating consumption for residential apartment buildings 
are about 15-20% of the total heating load.  

I have recently model a DHW, where my water heating load was 5 times the space 
heating load,which I found very unusual.  I sized the water storage and boiler 
based on ASPE table, which specifies hot water flow rate in the fixtures.  I 
also multiplied the load with a demand factor of 0.30 and storage with a factor 
of 1.25.  I set the process flow rate by dividing the demad with 60 (hourly 
demand/60 = GPM).  Design water temperature was set at 120 F.  Recirculation 
rate was 8 GPM.  Have I made any mistake?  Should I  have set the process flow 
rate at something else other than just dividing the GPH by 60?  I would really 
appreciate if someone can answer it.  Thanks all in advance.

Regards,
Hassan Quazi


      
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