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Re: [TRNSYS-users] Modelling- Building

Prof Taherian,
  Check the assumption that has been made about the boundary temperature beneath the floor of the building. Leaving that value set to its default 0C is a common cause of the results you are seeing. Leaving an input unconnected means that the value of that input is assumed to be constant throughout the simulation. The value will be taken from the initial value provided. There are numerous methods and models for setting the boundary temperature beneath a slab as a function of time. As a very first rough approximation you can set it to the average annual air temperature of the building's location.
best,
 David
 

On 07/07/2015 10:09, Hessam Taherian wrote:

Hi David,

 

We are modeling a 3D building with external chiller and cooling coil. The problem we have is that even with gains in the zones, the airnode temperatures are lower than the ambient temperature. The cooling effect (through ventilation) is almost zero yet the zone temperatures are low. That has puzzled us as to how is that possible.

Could you point me in the right direction?

 

Thanks

 

Hessam Taherian, PhD

Assistant Professor, and Thermal Fluid Systems Lab coordinator

SBA member ASHRAE, Member ASES, IBPSA-USA

Department of Mechanical Engineering

University of Alabama at Birmingham

Mailing address:

1720 Second Ave. S

BEC 257

Birmingham, AL 35294-4461

Email: taherian@uab.edu

Office phone: (205) 934-8461

Lab phone: (205) 975-6706

http://scholar.google.com/citations?hl=en&user=UkA8HIgAAAAJ&view_op=list_works

Go Blazers!!            DragonHead_sm.gif

 

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