[TRNSYS-users] Partload operation of Water to Water Heat Pump (Type 668)

[Fred Betz]

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 at aeieng.com<mailto:fbetz at aeieng.com>  |  www.aeieng.com<http://www.aeieng.com/>



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