Are you reporting the zone relative humidity? If the zone moisture level is dropping, this would explain the difference. You need to keep the zone conditions constant for this to work.
On 6/17/2011 8:56 AM, yangxiaoshan@xxxxxxxx wrote:
Hi,
Thanks for your reply. I had set the infiltration rate to 0 or other values. If ACH is 0, there is no latent cooling load and total cooling load equals to total sensible cooling load. That makes sense. But once the ACH is not 0, the infiltration heat gain is always less than latent cooling load. I do not know what else items could be also included in the latent cooling load component.
Best,
Xiaoshan
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, YuanLu Li <yli006@...> wrote:
>
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> Try changing the infiltration air change per hour to zero and to 2 to compare.
>
> There may be other compoent included in the total cooling load.
>
> Dr. Li
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> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> From: yangxiaoshan@...
> Date: Fri, 17 Jun 2011 06:37:59 +0800
> Subject: [EnergyPlus_Support] A question about Latent Cooling Load in E+
>
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> Dear Colleagues,
>
>
> I got a question about latent cooling load in EnergyPlus. The simulation settings are: a single zone with constant cooling setpoint (26℃ through the day), no internal heat gain, 1 air changes per hour and "Idea Load Air System" automatically used for HVAC configuration. Theoratically, due to there is no internal heat gain in this case, the follow correlation should be valid: "Total cooling load - Total sensible cooling load = Latent cooling load = Infiltration latent heat gain". But the simulation results shown that the infiltration latent heat gain is always less than the latent cooling load (Total cooling load - Total sensible cooling load), 2% for this case (8-9% less was found in other simulation case). I cannot understand why the infiltration heat gain is not equal to the calculated latent cooling load. Really headache! Look forward to discussing with you, thanks very much.
>
> Best regards,
> Xiaoshan
>
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