[TRNSYS-users] Type 941(Air to water heat pump)

David BRADLEY d.bradley at tess-inc.com
Fri Mar 27 08:31:13 PDT 2020


Hüseyin,

  I am not clear on what you mean by "it" doesn't change. I would 
recommend that you send the project, weather file, and heat pump files 
to your distributor so that they can have a look. If you aren't sure who 
to contact, please email me.

David


On 03/27/2020 10:27, Hüseyin Günhan Özcan wrote:
>
> 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
>
> *From:*David BRADLEY <d.bradley at tess-inc.com>
> *Sent:* Friday, March 27, 2020 3:12 PM
> *To:* Hüseyin Günhan Özcan <huseyin.ozcan at yasar.edu.tr>; TRNSYS users 
> mailing list at OneBuilding.org <trnsys-users at lists.onebuilding.org>
> *Cc:* Muhammad Zeeshan <zeeshanmuhammad922 at gmail.com>
> *Subject:* Re: [TRNSYS-users] Type 941(Air to water heat pump)
>
> 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>
>     <mailto: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>
>     <mailto:trnsys-users at lists.onebuilding.org>
>     *Cc:* David BRADLEY <d.bradley at tess-inc.com>
>     <mailto:d.bradley at tess-inc.com>; Muhammad Zeeshan
>     <zeeshanmuhammad922 at gmail.com> <mailto: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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>
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>
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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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>
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>
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>
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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
> Bu elektronik postada bulunan tum fikir ve gorusler ve ekindeki dosyalar sadece adres sahip/sahiplerine ait olup,
> Yasar Universitesi bu mesajin icerigi ile ilgili olarak hic bir hukuksal sorumlulugu kabul etmez. Eger gonderilmesi
> dusunulen kisi veya kurulus degilseniz, lutfen gonderen kisiyi derhal haberdar ediniz ve mesaji sisteminizden siliniz.
>
>
> The information contained in this e-mail and any files transmitted with it are intended solely for the use of the
> individual or entity to whom they are addressed Yasar University does not accept legal responsibility for the
> contents. If you are not the intended recipient, please immediately notify the sender and delete the message from your system.
>
-- 
***************************
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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