Dear David,
Thanks for your rapid reply. As you said, I
turned off the automatic heating and cooling. I can see the
temperature of the zone is floating. I also used a second
stage thermostat (type 1503) and adjust the high and low
stage temperatures.
However, it does not change although the
temperature floats between 19 °C and 30 C°.
Regards.
HG Ozcan
Hüseyin
This may seem very basic but make sure that you have turned
off the automatic heating and cooling in TRNBuild so that the
temperature of your zone is floating. You can verify this by
running your simulation; the zone temperature should more or
less follow the ambient temperature. You will then implement a
thermostat to watch the zone temperature and turn on/off the
heat pump accordingly.
If that is what you are doing already and the power and
capacity of the heat pump is not changing at all then it must
mean that neither the return air temperature nor the water
inlet temperature is changing at all. It could also mean that
the return air temperature and inlet water temperature are
outside the range of data values given in the data file. The
routine that reads the data file and interpolate within the
range but cannot extrapolate beyond the range given.
kind regards,
David
On 03/27/2020 09:29, Hüseyin Günhan Özcan
wrote:
Dear all,
I have a similar question about modeling air
source heat pump.
In my case I am working the model inverter
heat pump so I selected the multi stage heat pump (Type
922c).
Meanwhile, I connected its return temperature
value to the Type 56 indoor temperature (I am following a
single room) and I also use Type 15-6 for outdoor
conditions. Although I make some changes in the building
file (internal heat gain, regimes, etc.) and weather data
the model shows always the same values.
Therefore, I realized that it only works
based on external catalogue values. But, it does not make
sense. Do you have an idea about this case ? How can type
922c operates based on temperature variations belongs to
the building.
Another question is how can I change the
catalogue values ? (I have no problem in proforma
including parameter, input and output parts).
Thanks in advance.
Huseyin
Gunhan Ozcan
Visiting
Researcher
Porto
Uni., Dept. of Mech. Eng.
<image001.png>
Muhammad,
Please refer to the Type941 documentation. It explains
how the external files and the parameters relate to each
other to compute the overall capacity and power consumption
of the heat pump.
The evaporator does not really need to be designed more
than to choose a machine with an appropriate rated capacity.
Traditionally that might mean adding a safety factor to the
peak cooling load (10% is often used) and then selecting a
machine that will meet that capacity. Also bear in mind that
Type941 models a single speed (ie single capacity) heat pump
that is either on or off. Depending on how variable the load
in your building it, you might want to meet that load with
multiple smaller heat pumps rather than one big one.
kind regards,
David
On 03/27/2020 08:02, Muhammad Zeeshan
via TRNSYS-users wrote:
Hello Everyone,
I am
working on cooling a building with type 41(air to
water source heat pump). The cooling load of the
building is 25 tons. I want to know
1)- how the compressor power will
be calculated? as the external files of type 941
contains fractions of compressor power which shows no
link to the equations provided in manual. How to link
the external file with the provided equations?
2)-As the cooling load of the
building is 25 tons, how to design the evaporator for
this building load?
Your help in this regard will be
highly appreciated.
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--
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
3 North Pinckney Street - suite 202
Madison, WI 53703 USA
P:+1.608.274.2577
F:+1.608.278.1475
d.bradley@tess-inc.com
http://www.tess-inc.com
http://www.trnsys.com
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***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
3 North Pinckney Street - suite 202
Madison, WI 53703 USA
P:+1.608.274.2577
F:+1.608.278.1475
d.bradley@tess-inc.com
http://www.tess-inc.com
http://www.trnsys.com