I thought the latent heat from people is already calculated in the EPlus simulation with the number of people in the zone.
Comfort PMV values are available in the EPlus simulation. Moisture increase from people activities is also visible in the simulation.
If you know there is a large latent heat load, I believe a quantity may be added into to the zone object.
Sizing:DesignDay, and Sizing run period sumilation does not use all the data in the weather file. Therefore, the result from run period simulation can be different form the sizing run period simulation of the same dates.
If larger sizing is required, the multiplier can be increased to more than 1.0. Over sized system will have a low PLR, Part load ratio.
These are what I have observed. I may be wrong.
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: wfbuhl@xxxxxxx
Date: Thu, 24 Sep 2009 11:28:28 -0700
Subject: Re: [EnergyPlus_Support] Sizing: system object -
Fred Buhl
On 9/24/2009 6:22 AM, Mário Neves wrote:
Thank you for answering, but if we have a situation with a significant internal latent load, lets say a theater wonâ??t this mean that that the design air flow calculated for the system will be insufficient to achieve comfort conditions for the occupants?
Thanks once again
MN
From: Don Shirey <shirey@fsec.ucf.edu>
To: EnergyPlus_Support@yahoogroups. com
Sent: Thursday, September 24, 2009 1:39:31 PM
Subject: Re: [EnergyPlus_Support] Sizing: system object -
Field: Type of Load to Size On
The user specified type of load on which to size the central system. The choices are Sensible, Latent, Total and VentilationRequirem ent. Only Sensible and VentilationRequirem ent are operational. Sensible means that the central system supply air flow rate will be determined by combining the zone design air flow rates, which have been calculated to meet the zone sensible loads from the design days. VentilationRequirem ent means that the central system supply air flow rate will be determined by the system ventilation requirement.
Mário wrote:Hello to everyone In the sizing: system object, according to the Input/Output reference guide, on the type of load to size on field there are two options, sensible and latent, being the sensible load the only one operational. But while working with the IDF editor I found that there is another option: Ventilation Requirement. Does anyone know why is the type of load to size on only the sensible and what's with the field Ventilation Requirement, what does it do? Thanks and have a good day MN
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