[Equest-users] Heat Recovery from Refrigeration

Dave Bastow dbastow at mcclure-engineering.com
Thu Nov 17 13:08:56 PST 2011


Typically the amount of heat that can be recovered from refrigeration heat
reclaim is from 50% to 80% of the total heat of rejection of the
refrigeration system.  It varies depending on the outside temperature, which
causes the refrigeration system head pressure and associated heat to drop.
Also, the refrigeration load placed on the refrigeration system various with
the outdoor ambient air temperature.  If you only have refrigeration cases
and walk-ins that are all located inside of a temperature controlled store,
then the actual refrigeration load is 70-80% of the typical design BTUH
load, because the inside temperature of the building is like maybe 70
degrees F DB and 40 degrees F WB in winter, while the summer design is
75/55.  If you have walk-in coolers that are located outside then the
refrigeration BTUH load can be dropped clear down to zero at times, in which
cause there is no refrigeration heat reclaim available at all.  You will
have to look at your particular situation and use engineering judgment
accordingly.   

 

If you model this you should vary the refrigeration load with the outside
air temperature and maybe use like 80% of the total heat of rejection for
recoverable heat. 

 

David A. Bastow 

McClure Engineering, Inc.  

 

 

 

From: Rinkesh Shah [mailto:rinkesh.shah at smithandandersen.com] 
Sent: Tuesday, November 15, 2011 6:06 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Heat Recovery from Refrigeration

 

Hi eQuesters,

 

I am modeling a big box store that uses heat reclaim loop to recover energy
from their refrigeration load.  The store is to be located in Toronto,
Canada.

I was wondering if anyone on these boards has had experience with using heat
recovery in the refrigeration section of the zones?

 

I am hesitant on using the numbers I get from the Heat recovery feature in
the refrigeration portion, as I can't see the math behind it.  

Help files do not explain how this works and the hourly report doesn't have
category specific to heat recovery from refrigeration.

 

Also if anyone has had experience even with what type of % reduction on the
heating, that would be useful too.

 

Thanks,

Smith + Andersen

 

Rinkesh Shah, B. A. Sc.

Designer - Mechanical

416 487 8151 ext 381

rinkesh.shah at smithandandersen.com

 

4211 Yonge Street Suite 500 Toronto Ontario M2P 2A9 

t 416 487 8151 f 416 487 9104  smithandandersen.com

 

Vancouver  Kelowna  Victoria  Calgary  Edmonton  Toronto  Ottawa  Dubai

 

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