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Re: [EnergyPlus_Support] DV Thermostat Temperature

Dear Daiounomiso,

Your email has just come to my attention - sorry for the delay in 

The only possible problem I can think of immediately, without seeing 
your input file and weather file, is that your system can't modulate the 
cooling supplied to the zone to a sufficient extent, either because the 
turndown isn't sufficient (if it's a VAV system) and/or because the 
supply air temperature is too low and can't be reset high enough (eg 
using Setpoint Manager: Warmest). Is the DV Thermostat temperature 
always too low, even at design conditions? Note that, if you specify a 
Sizing Factor greater than unity and your system cannot modulate the 
amount of cooling supplied, you may still get overcooling.

If this doesn't help you solve your problem, please send your input 
file, and also the weather file (unless you can reproduce the problem 
with just Design Days) direct to me.


daiounomiso wrote:

>Dear Sir,
>I try to simulate using UCSD Displacement Ventilation Model. I 
>wonder whether the outputs are correct or not. I think that DV 
>Thermostat Temperature must be almost equal to the set-up zone 
>temperature, but they aren?ft the same value in my model. For 
>example, in cooling, I set the zone temperature in 24 C, but the 
>output: DV Thermostat Temperature is about 22 C. In short, the zone 
>is cooled more than the set-up temperature.
>Would you tell me what causes such a problem? Or, are the simulation 
>results alright?
>I want to know about the relationship between other outputs of UCSD 
>Displacement Ventilation Model and the outputs of other objects, 
>too. Please tell me, if there are some points to notice. For 
>example, whether DV Mixed Subzone Temperature is equal to Return 
>Temperature or not?c
>The primary EnergyPlus web site is found at:
>The group web site is:
>Attachments are not allowed -- please post any files to the appropriate folder in the Files area of the Support Web Site.
>Yahoo! Groups Links

Philip Haves
Leader, Commercial Building Systems Group
Lawrence Berkeley National Laboratory, MS 90-3111
Berkeley, CA 94720
Tel: (510) 486 6512
Fax: (510) 486 4089

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