[Equest-users] [Bldg-sim] Modelling air cooled heat recovery chiller in eQUEST

[Bishop, Bill]

Syed,

Based on the help documentation, "heat will be recovered whenever the return temperature of the loop is less than the maximum allowable condensing temperature of the chiller". This makes heat recovery to DHW loops difficult in eQUEST, because DHW loops are usually once-through (no recirculation, so no return) and even if you model a recirculation pump, the typical design return temperature would be around 120F instead of the low service water temperature of around 50F.

You could try experimenting with the MAX-RECOVER-T and the supply/return temperatures of the DHW loop. I tried dropping the DHW supply temperature but that still didn't seem to make it work.

You could try modeling the DHW as a HW loop with a process load and see if that makes it work.

Best regards,

~Bill



________________________________
From: Equest-users <equest-users-bounces at lists.onebuilding.org> on behalf of Bishop, Bill via Equest-users <equest-users at lists.onebuilding.org>
Sent: Friday, May 15, 2020 8:16 AM
To: rintveld at ptrenergy.com; Syed Safiuddin Hussaini; bldg-sim at lists.onebuilding.org
Cc: equest-users
Subject: Re: [Equest-users] [Bldg-sim] Modelling air cooled heat recovery chiller in eQUEST

Hi Syed,

There are inputs for chiller heat recovery in eQUEST. I just tried to model it using your description but it didn't seem to be working. Maybe you'll get some more feedback at equest-users (cc'd).

~Bill

________________________________
From: Bldg-sim <bldg-sim-bounces at lists.onebuilding.org> on behalf of Syed Safiuddin Hussaini via Bldg-sim <bldg-sim at lists.onebuilding.org>
Sent: Thursday, May 14, 2020 10:35 PM
To: bldg-sim at lists.onebuilding.org; rintveld at ptrenergy.com
Subject: [Bldg-sim] Modelling air cooled heat recovery chiller in eQUEST

Hi All,

The building that I am modelling in eQUEST has an air-cooled heat recovery chiller wherein the rejected heat from air cooled condenser is utilized to preheat the domestic hot water to the domestic hot water heater.

Is there a workaround in eQUEST for modelling the above system configuration?

Thank You



Syed Hussaini, PE, LEED GA

Energy Engineer II

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Partner Energy

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www.ptrenergy.com<http://www.ptrenergy.com/> | shussaini at ptrenergy.com<mailto:shussaini at ptrenergy.com>

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