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Dear all,
I am trying to model a direct expansion
solar assisted heat pump system and I am wondering whether I can build up
the system in TRNSYS 16.1? In this system, the solar collector is serpentine and
is also used as the evaporator of the heat
pump, with the refrigerant evaporating from the liquid to the vapor. Do we have
the expansion valve module in TRNSYS library? Can the compressor module in
TRNSYS be used to compress the refrigrant rather than air? Can the vertical
storage tank module be used in the case that the refrigrant is circulating
inside the heat exchanger? Thanks in advance.
Best Regards,
Candy He
Research Assistant
City Univercity of Hong Kong
----- Original Message -----
Sent: Tuesday, May 15, 2007 1:56 AM
Subject: Re: [TRNSYS-users] Solar
Assisted Heat Pump System
"Since I?m using Trnsys for the first time I have some questions about
modelling the heat pump:
Which Type (also from TESS-Library) should I use
to model the heat pump? "
I would recommend using Type 504 from the
TESS libraries - it was written for exactly this type of situation.
"How can I control the input # 5 ?Heating control function? of type
20? Is it calculated internally or has it to be connected with an Output from
the solar collector (Output # 1, Type1b, ?Outlet Temp???)."
It's not
calculated internally and should not be connected to the solar collector. This
input is used to turn the heat pump on and off and should be connected to some
device that is sensing the heating demand (the load the heat pump is meeting)
- likely a thermostat, aquastat, or equation. You'll also need a controller
and some valves to control the flow of water across/around the heat pump. I've
attached a simple schematic that may help you set it up.
Jeff
Jeff Thornton
President - TESS, LLC
2916
Marketplace Drive - Suite 104
Madison WI 53719 USA
Phone:
608-274-2577
Fax: 608-278-1475
E-mail: thornton@tess-inc.com
Web:
www.tess-inc.com
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