Zone heat balance v3

mspider · Posts: 47

Hi Team,

I've been doing some detailed analysis of zone heat balances while investigating the use of the chilled ceiling component in detailed HVAC. However, my query arises from a zone where all cooling is provided by the air-side system. As seen in the attached image, I'm getting ~120W/m² heat gain from the glazing while zone sensible cooling is <60W/m². This discrepancy raised a bit of a question mark.

I've looked at the results in the E+ sql file and discovered a similar discrepancy which I have no explanation for. The E+ Input/Output references states that the variable "Zone Transmitted Solar" is "The total Window Transmitted Solar of all the exterior windows in a zone" and also "Zone/Sys Sensible Cooling Rate" "represents the sensible cooling rate in Watts that is actually supplied by the system to that zone for the timestep reported".

So my thinking is that the "Zone/Sys Sensible Cooling Rate" should balance out with the zone loads, in particular "Zone Transmitted Solar". Yet this is not the case.

Have I missed something? Another variable to capture additional cooling?

Your assistance is appreciated.

Thanks
Matt

admin · Posts: 10

Matt,

Could you send the dsb file with the output options used for the simulation so we can look into it?

Andy

mspider · Posts: 47

Hi Andy,

File is attached. The output file I've appended to the dsb-created idf file.

Thanks
Matt

mspider · Posts: 47

Hi Andy,

Have you had a chance to look into the zone heat balance? Would be great to get some feedback on the Zone-level outputs.

Thanks
Matt

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