[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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> --
>
> ***************************
>
> 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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>
> 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 <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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