[TRNSYS-users] Type 941(Air to water heat pump)
David BRADLEY
d.bradley at tess-inc.com
Fri Mar 27 08:11:47 PDT 2020
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.*
>
> **
>
> *Adsız*
>
> *From:*TRNSYS-users <trnsys-users-bounces at lists.onebuilding.org> *On
> Behalf Of *David BRADLEY via TRNSYS-users
> *Sent:* Friday, March 27, 2020 1:45 PM
> *To:* TRNSYS users mailing list at OneBuilding.org
> <trnsys-users at lists.onebuilding.org>
> *Cc:* David BRADLEY <d.bradley at tess-inc.com>; Muhammad Zeeshan
> <zeeshanmuhammad922 at gmail.com>
> *Subject:* Re: [TRNSYS-users] Type 941(Air to water heat pump)
>
> 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.
>
> Regards,
>
> Muhammad Zeeshan
>
>
>
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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 at tess-inc.com <mailto:d.bradley at 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 at tess-inc.com
http://www.tess-inc.com
http://www.trnsys.com
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