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

[Hüseyin Günhan Özcan]

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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