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

[Muhammad Zeeshan]

Thanks a lot David. Would you please elaborate a bit more about the
compressor power how it would be calculated?
External files contains fractions of compressor power e.g. 0.8,0.9 etc.
Where as in manual equations are quoted as: q_condensor = q_evporator +
p_compressor
Here, both q_condensor and p_compressor are unknown
How q_condensor and p_compressor will be calculated.

Thanks

Regards,
Muhammad Zeeshan

On Fri, Mar 27, 2020, 18:45 David BRADLEY <d.bradley at tess-inc.com> wrote:

> 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
>
> _______________________________________________
> TRNSYS-users mailing listTRNSYS-users at lists.onebuilding.orghttp://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org
>
> --
> ***************************
> David BRADLEY
> Principal
> Thermal Energy Systems Specialists, LLC
> 3 North Pinckney Street - suite 202
> Madison, WI  53703 USA
>
> P:+1.608.274.2577
> F:+1.608.278.1475d.bradley at tess-inc.com
> http://www.tess-inc.comhttp://www.trnsys.com
>
>
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