[TRNSYS-users] Creating the data file for the Air Source Heat Pump (Type 119)
David BRADLEY
d.bradley at tess-inc.com
Thu Dec 19 09:05:53 PST 2019
Hüseyin,
I am not quite sure what is plotted in the graphs below; is it heat
transfer or heat pump power consumption? In any case, if you have
checked to make sure that your controls are all correct and that indeed
the heat pump is turning off then I'd suggest that you send the project
to your distributor's tech support hotline for assistance.
kind regards,
David
On 12/19/2019 04:22, Hüseyin Günhan Özcan wrote:
>
> Hi everyone,
>
> I have been working on the similar case. In our project, I have a
> commercial split type air conditioner (2.52 kW cooling and 2.84 kW
> heating rated capacities) and I found that type 954c is performed
> much better than type 119c for simulating real time experiments’ result.
>
> However, I want to ask that it never shows the value zero. As can be
> seen below, while opearating in cooling function (picture on the left)
> the straight line is not zero. Moreover, when it is operating in
> heating mode (Picture on the right), it never stops.
>
> Is there anyone to have a idea about this case ?
>
> Regards.
>
> *Res. Assist. Huseyin Gunhan Ozcan*
>
> *Yasar Uni. Dept. of Energ. Sys. Eng. *
>
> Adsız02
>
> *From:*TRNSYS-users <trnsys-users-bounces at lists.onebuilding.org> *On
> Behalf Of *Audun Bull Kristiansen via TRNSYS-users
> *Sent:* Thursday, December 19, 2019 8:48 AM
> *To:* David BRADLEY <d.bradley at tess-inc.com>;
> trnsys-users at lists.onebuilding.org
> *Cc:* Audun Bull Kristiansen <audun.bull at hotmail.com>
> *Subject:* Re: [TRNSYS-users] Creating the data file for the Air
> Source Heat Pump (Type 119)
>
> Thanks for the reply, David!
>
> I shared my question and your answer with two other researchers, who
> gave me these suggestions:
>
> 1. Use the output values of Type 119c without any changes in its .dat
> files. The rated COP of our heat pump in cooling mode is 4.17
> (Rated cooling power / Rated cooling input power) and the rated
> COP of the model in Heating.dat seams to me to be 3.12 (The
> largest cooling power 18173 divided by the input power 5823). The
> ratio equals 1.34. Then the input power for cooling at each time
> step can be found as the “Total Cooling Rate”/(”Output COP”*1.34),
> where “Total Cooling Rate” and ”Output COP” are output from Type
> 119c. The above calculation method is based on the assumption that
> the COP variation due to operating condition changes is equally
> propotional for different air-conditioners.
>
> 2. Use Type 401 <https://trnsys.de/download/en/ts_type_401_en.pdf>
> (license can be bought from TRANSSOLAR). I think the model is
> relatively transparent.
>
> I share the answers, in case they might help someone who has the same
> question. I am not sure about the accuracy of the first approach, but
> I assume that it is more accurate than to use the .dat files without
> any modification.
>
> Audun
>
> *From:*David BRADLEY <mailto:d.bradley at tess-inc.com>
> *Sent:* Wednesday, December 18, 2019 12:55 AM
> *To:* trnsys-users at lists.onebuilding.org
> <mailto:trnsys-users at lists.onebuilding.org>
> *Cc:* Audun Bull Kristiansen <mailto:audun.bull at hotmail.com>
>
> Audun,
>
> It is sometimes possible to make a plot of the normalized data in the
> *.dat files that are provided and then to normalize and overlay the
> data points that you have from the manufacturer. Patterns in the data
> files and in the manufacturer data may become evident and you can fill
> in the remainder of the points in the data file and also intelligently
> extrapolate beyond the data that is given in those *.dat files.
>
> My larger concern is that it looks to me as though the heat pump you
> are working with is a variable capacity (perhaps a variable speed
> compressor) machine while Type119 is a single capacity device that is
> either on or off and whose performance (cooling capacity, heating
> capacity, and COP) are a function primarily of the ambient
> temperatures but /not/ of part load. I have written a variable speed
> compressor heat pump model but like Type119 it still requires a
> performance map data file.
>
> kind regards,
>
> David
>
> On 12/16/2019 01:55, Audun Bull Kristiansen via TRNSYS-users wrote:
>
> I use the Air Source Heat Pump (ASHP) unit Type 119c in a
> simulation of a container building in TRNSYS 18, since this seems
> to be the only ASHP type available. I need to add the two external
> .dat- files that contains the heating and cooling performance
> data, respectively. I read in “09-Tutorials” page 163-164 that:
>
> “/The ASHP component model requires a data file that includes the
> performance map for the piece of equipment. This performance map
> is unique to the exact piece of equipment that is being modeled
> and you will need to produce this file from the manufacturer’s
> performance data for the specific equipment being modeled/.”
>
> The component does not extrapolate beyond the data range provided,
> so we need to include data for outdoor temperatures between -5 °C
> and 40 °C (Shanghai climate). The indoor temperature is expected
> to be between -5 °C and 50 °C (due to that the heat pump is turned
> off when no one is at home).
>
> I read “10.2.3.4 Resizing the PTHP Units” that says that the
> recommended method is to find a manufacturer of PTHP units online
> and to search through the available product literature to find a
> PTHP that has a capacity as close as possible without being less
> than the peak total cooling or heating load required by the zone
> that will be conditioned by the PTHP. Do someone know any such
> online source that contain adequate information where I can search
> for a similar product?
>
> Or do you recommend me to go for the second approach, to
> renormalize the example files ASHP_Cooling.dat and
> ASHP_Heating.dat that comes with TRNSYS to a different rated
> capacity? But my highest “return air dry bulb temperature”
> and “Outdoor dry bulb temperature” are far higher than in these
> example files, so then I need to extrapolate the data. And how do
> I locate the performance point in ASHP_Cooling.dat that
> corresponds to the rated point, as described in 10.2.3.4?
>
> I have also tried to model with ideal heater and cooler and divide
> the electric energy use for heating and cooling by their
> respective seasonal COP, but that is not accurate enough since I
> need to take into account the variation in COP over the year.
>
> The heat pump that we have installed and want to model is GREE
> KFR-35W/FNhD02-A1 outdoor unit (corresponding to indoor unit model
> KFR-35GW/(35592)FNhAa-A1) which has the following performance data:
>
> * Cooling power (rated/min./max.): 3500/200/4200 W
> * Heating power (rated/min./max.): 4900/500/5600 W +1000 W
> (Additional electrical heating)
> * Cooling input power (rated/min./max.): 840/90/1300 W
> * Heating input power (rated/min./max.): 1450/120/1700 W
> * Additional electrical heating input power: 1000 W
> * Cooling seasonal COP: 5.33
> * Heating seasonal COP: 3.53
> * Yearly COP: 4.53
>
> I tried to contact the manufacturer to get input data for the
> files and sent them the instructions from “4 Mathematical
> Reference” page 174-175 “Data Files” and the two example files
> ASHP_Cooling.dat and ASHP_Heating.dat that comes with TRNSYS 18.
> The data they sent me, however, was not for constant air flow
> rates. For instance, for heating mode they sent me similar
> information as in the table below for various temperatures. The
> problem is that these data does not keep a set of fixed
> temperatures and air flow rates, like in the example files.
>
> indoor air temperature
>
>
>
> outdoor air temperature
>
>
>
> Total capacity (kJ/h)
>
>
>
> Power consumption(kJ/h)
>
>
>
> Air Flow Rate(l/s)
>
>
>
> Return air dry bulb(℃)
>
> 30℃
>
>
>
> 28℃/RH50％
>
>
>
> 762
>
>
>
> 127
>
>
>
> 163
>
>
>
> 44.5
>
> 24℃/RH55％
>
>
>
> 706
>
>
>
> 128
>
>
>
> 163
>
>
>
> 43.3
>
> 20℃/RH59％
>
>
>
> 785
>
>
>
> 169
>
>
>
> 163
>
>
>
> 44.9
>
> 15℃/RH65％
>
>
>
> 992
>
>
>
> 284
>
>
>
> 161
>
>
>
> 49.2
>
> 11℃/RH75％
>
>
>
> 1078
>
>
>
> 362
>
>
>
> 160
>
>
>
> 51.2
>
> 7℃/RH85％
>
>
>
> 1085
>
>
>
> 418
>
>
>
> 160
>
>
>
> 51.3
>
> 2℃/RH85％
>
>
>
> 1063
>
>
>
> 485
>
>
>
> 159
>
>
>
> 51
>
> Audun
>
>
>
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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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