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Michael,<br>
My apologies for the delay in looking at the problem. You have set
up the temperature level control correctly (nicely done). There are
two reasons why your zone is not holding temperature. First, the
thermostat model is set to hold a cooling set point temperature in
the kitchen of 24C. However, your cooling device is set to provide a
25C supply temperature. I would recommend a supply temperature in
the neighborhood of 10-12C. Second, the zone that you are
controlling (the kitchen) has a LOT of internal gains and the
capacity of the cooling device that you have selected (10,000 kJ/h -
2.8kW) is not enough to cool the space. <br>
<br>
As a side note, there are a few problems with the way you've done
the cooling. First, the specific heat of the working fluid has to be
set to 1.007 kJ/kg.K as the device is cooling air, not water.
Second, Type92 is really intended as a liquid cooling device. As
such, it does not calculate the impact of humidity. You have started
out correctly by passing a humidity variable around the cooling
device and then reconnecting it at the outlet. However, you need to
pass the absolute humidity ratio, not the relative humidity because
relative humidity changes as soon as there is a change in dry bulb
temperature, even if there is no change in moisture content. Pass
the absolute humidity ratio from the fan to a Type33 psychrometrics
routine. Pass the outlet temperature from the cooling device from
the Type92 to the Type33. This isn't quite right either because in
this case, you are assuming that there is no condensation of water
out of the airstream as it is cooled. In almost all cases, there
would be some condensation and as a result, some dehumidification of
the air as it is cooled. <br>
<br>
Best,<br>
David<br>
<br>
<br>
<div class="moz-cite-prefix">On 10/30/2012 01:41, Michael Diekerhof
wrote:<br>
</div>
<blockquote cite="mid:508F76AA.6030605@web.de" type="cite">Dear all,
<br>
<br>
in my masterthesis I am trying to connect a heat pump (type401) to
a buffer storage and then to type 56. But the first step was to
change from energy rated control to temperature level control; so
I followed the TRNSYS tutorial. But somehow the indoor air
temperature (kitchen) is not controlled at all. I´ve checked it
twice and as i can see i did everything exactly like the tutorial
explained. As long as I am not able to control this temperature
around 20°C I shouldn´t think about implementing a heat pump and a
storage.
<br>
<br>
I attached the project and the bui.file and as you can see the
heating is on and especially in the cold months (e.g. january) the
room temperature is abnormaly high.
<br>
<br>
I am very thankful for any suggestion how to control the
T_Air_Kitchen around 20°C ! I have no idea what could be wrong
right now and at my university there´s no one who has experiences
with TRNSYS. So thanks in advance!
<br>
<br>
Best,
<br>
Michael
<br>
<br>
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<pre class="moz-signature" cols="72">--
***************************
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
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