[TRNSYS-users] Cooling demand in TRNSYS

[RUBIO RUBIO, JOSÉ JAVIER]

David,

Thank you for your answer. I see your point but what doesn't make sense to me is the fact that I have four airnodes with different cooling setpoints. When I use the Air Side Heat Transfer output from the cooling coils (Type508) as an input for the cooling power available in three of the airnodes, it works and Qcool is not zero in any of them but it becomes zero (all of them) when I include the fourth airnode.

I have used a plot to compare the Qcool from Type56 and the Air Side Heat Transfer output from the cooling coils and the difference among the airnodes is that in the three which work, as I mentioned in the previous paragraph, the output from the cooling coil is bigger than Qcool from Type56. However, in the fourth airnode is just the opposite.

I hope I have explained myself clearly and you can help me to figure it out.

Thanks again in advance and sorry for the inconvenience,

Best regards,

José Javier.
De: David BRADLEY <d.bradley at tess-inc.com>
Enviado el: lunes, 10 de mayo de 2021 19:50
Para: TRNSYS users mailing list at OneBuilding.org <trnsys-users at lists.onebuilding.org>
CC: RUBIO RUBIO, JOSÉ JAVIER <josejavier.rubio at edu.upct.es>
Asunto: Re: [TRNSYS-users] Cooling demand in TRNSYS


José Javier,

  What Type56 is reporting in those outputs is the amount of additional energy that must be removed from a zone in order to maintain the setpoint that you have provided. If you give the zone exactly the amount of cooling energy that it needs then the demand for additional cooling energy is zero.

  kind regards,

 David


On 05/07/2021 07:52, RUBIO RUBIO, JOSÉ JAVIER via TRNSYS-users wrote:
To whom it may concern,

I am developing a cooling system with TRNSYS18 and I have several problems when I try to connect as an input the heat transfer of the coils in the chambers by using the Cooling Type Manager. You have an example below:

[cid:image001.png at 01D74714.7ABEC680]

Where Q_evap4C, Q_evap8C, Q_carga4C and Q_descarga4C are the "Air Side Heat Transfer" output of the cooling coils.

[cid:image002.png at 01D74714.7ABEC680]

When I use it as an input for the power available in each cooling zone, the cooling demand of the zone is zero which is non-sense. Any way to figure it out?

Thanks in advance and sorry for the inconvenience,

Best regards.

Jose Javier.



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David BRADLEY

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Thermal Energy Systems Specialists, LLC

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d.bradley at tess-inc.com<mailto:d.bradley at tess-inc.com>



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