The other heat pumps Type505 and
Type 665 have an air stream, and I need a water-to-water heat pump.
Is there another heat pump I am
missing?
|
Fred Betz PhD., LEED AP
Sustainable
Systems Analyst
|
|
AEI | AFFILIATED ENGINEERS, INC.
5802 Research Park Blvd. | Madison, WI 53719
P: 608.236.1175 | F:
608.238.2614
fbetz@aeieng.com | www.aeieng.com
|
From: David BRADLEY
[mailto:d.bradley@tess-inc.com]
Sent: Monday, October 18, 2010 10:52 AM
To: Fred Betz
Cc: TRNSYS-users@cae.wisc.edu
Subject: Re: [TRNSYS-users] Partload operation of Water to Water Heat
Pump (Type 668)
Fred,
Type668 models a single stage heat pump. There are other versions of the
heat pump model designed to simulate the performance of multistage heat pumps
and there are controller models to go with them.
Best,
David
On 10/15/2010 14:04, Fred Betz wrote:
Does anyone know of a way to make part load operation work
in Type668?
The performance maps are based on entering conditions on the
evaporator and condenser side. However, there is no direct way to make type668
run at 10%, 50%, etc.
The work around I have used in the past is dividing the
performance map by 50% to reflect two stages of operation and so on. Then
setting up valves and controls to route the flow correctly.
The HP I am modeling has a 10:1 turn down ratio and I don’t
want to make 10 heat pumps each with 10% of the total capacity of a single
unit.
Please advise,
Fred
|
Fred Betz
PhD., LEED AP
Sustainable
Systems Analyst
|
|
AEI | AFFILIATED ENGINEERS, INC.
5802 Research Park Blvd. | Madison, WI 53719
P: 608.236.1175 | F:
608.238.2614
fbetz@aeieng.com | www.aeieng.com
|
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--
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI 53703 USA
P:+1.608.274.2577
F:+1.608.278.1475
d.bradley@tess-inc.com
http://www.tess-inc.com
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