[TRNSYS-users] Simulation with Type655 air-cooled chiller

[a8304506 at graduate.hku.hk]

Hello, Duffy.

Thank you for your reply.  I think I am not addressing the problem properly. 
With direct solar radiation on the condenser coil, the tube surface temperature
will increase.  Consequently, the condenser pressure (and hence the refrigerant
temperature) has to be higher in order to allow the refrigerant to cool down
when passing through the condenser coil.  As the component calculates the
chiller performance only by interpolating between data provided by the user,
the only way to account for this effect (I suppose) is to make suitable
adjustment to the ambient air temperature.  I do not mean that the solar
radiation will directly heat up the condenser air.

Best Regards
LEE, Chun Kwong

Quoting Matt Duffy <duffy at tess-inc.com>:

> 
> Dear Chun Kwong LEE,
> 
> I have thought about this same concept with my outdoor condensing unit on
> my residential air conditioner. Does the solar radiation on the unit have
> any effect? My intuition says that that there in negligible effect because
> ambient air is moving through the unit very quickly and air has relatively
> little capacitance.
> 
> Best regards,
> 
> Matt Duffy
> 
> 
> 
> ----- Original Message -----
> From: "" <a8304506 at graduate.hku.hk>
> Sent: Sun, September 5, 2010 19:36
> Subject:[TRNSYS-users] Simulation with Type655 air-cooled chiller
> 
> 
> Hello, everyone.
> 
> I have been using the Type655 to simulate the performance of an air-cooled
> chiller, but I have one query.  How can I take into account the effect of
> sunshine on the chiller performance, as an air-cooled chiller is supposed
> to be
> placed in an outdoor location.  The proforma only requires the input of
> ambient
> temperature.  Should I make some adjustment to this ambient temperature
> rather
> than just using the value directly from the weather file?  Please advise.
> Thank you!
> 
> Best Regards
> LEE, Chun Kwong
> Division of Building Science and Technology
> City University of Hong Kong
> 
> 
> 
> 
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> 
> ----- End of original message -----
>