[TRNSYS-users] Determination of loading profile using Type56

[David Bradley]

Chun Kwong,
  I think your interpretation of QSENS and QLATD are correct. It is 
hard to determine why the building is not responding to an 
appropriately sized heat pump without knowing a bit more about which 
heat pump model you are using; it might be that there is a problem 
with the controls that are preventing the working fluid of the heat 
pump (air or water) from getting into the building zones. There might 
be a unit conversion error (Type56 wants it ventilation flow rates in 
air changes and most HVAC components put out flow rates in mass flow 
units of kg/h so you have to convert). I would suggest putting an 
online plot onto the the inlet and outlet streams of the heat pump 
component to verify that it is performing as you would expect it to.
Kind regards,
  David


At 20:30 2/26/2008, h8304506 at hkusua.hku.hk wrote:
>Hello, Trnsys users.
>
>I try to estimate the loading profile of a building using the Type56
>multi-zone model.  I suppose that by assigning a set value for the
>room temperature and relative humidity, the calculated QSENS_CORE and
>QLATD_CORE should represent the sensible and latent load of the
>building.  However, when I then select a heat pump of similar capacity
>to simulate, the result indicate that the heat pump is seriously
>undersized. Is my interpretation of the building loads wrong?  Is so,
>how can I get it correctly?  Your reply is highly appreciated.  Thank
>you!
>
>Best Regards
>LEE, Chun Kwong
>PhD student
>Department of Mechanical Engineering
>University of Hong Kong
>
>
>
>
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>TRNSYS-users at engr.wisc.edu
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