What output should I select to obtain the HVAC system load profile in each thermal zone?

asked 2019-04-29 05:00:38 -0600

anacun18
41 ●2

updated 2019-04-29 07:34:54 -0600

Hello. I am doing a simulation to a supermarket, and then I intend to calculate the energy class of the building. For this I need to know the heating / cooling loads of each HVAC system. I have already noticed that the results of the HVAC loads are present in the OpenStudio results as "HVAC load profile" , but I expect the results to be by zone and not global. Does anyone know what output I have to select?

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answered 2019-04-29 12:35:49 -0600

ericmartinpe

2104 ●42 ●8 http://ericmartinpe.com/

updated 2019-04-29 12:36:54 -0600

Do you have single-zone HVAC systems, or a multi-zone system with terminal units?

If you have single-zone systems, you can just output the heating/cooling coil energy for each system:

Output:Variable,*,Cooling Coil Total Cooling Energy,hourly;
Output:Variable,*,Heating Coil Heating Energy,hourly;

If you have a multi-zone system, you'd have to sum the sensible and latent loads. You can output the sensible loads for each zone using:

Output:Variable,*,Zone Air Terminal Sensible Heating Energy,hourly;
Output:Variable,*,Zone Air Terminal Sensible Cooling Energy,hourly;

The latent loads can be output using:

Output:Variable,*,Zone Total Internal Latent Gain Energy,hourly;
Output:Variable,*,Zone Infiltration Total Heat Gain Energy,hourly;

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Does this answer imply that the latent loads can only be outputted for multi-zone systems?

IanVG ( 2023-11-28 09:55:58 -0600 )edit

No, latent loads can be output for any zone with

Output:Variable,*,Zone Total Internal Latent Gain Energy,hourly;

ericmartinpe ( 2023-11-28 11:20:29 -0600 )edit

The above reports provide the delivered capacities. You can look at zone loads using these. Remember if the zone set point temperature is not maintained, these reports will also increase dramatically.

HVAC,Average,Zone Predicted Sensible Load to Setpoint Heat Transfer Rate [W]
HVAC,Average,Zone Predicted Sensible Load to Heating Setpoint Heat Transfer Rate [W]
HVAC,Average,Zone Predicted Sensible Load to Cooling Setpoint Heat Transfer Rate [W]