[Equest-users] HVAC simulation

[Siddharth V]

Hi Vikram and Rohini, 

Thanks for the response. 

Well, I see that on July/August, the Humidity levels are pretty high. So 
in order to remove excess humidity in the air, the heater operates. 

So that satisfies the heating energy levels. 

But actually I am trying to find a correlation b/w the HVAC Power 
consumption and Heat Index(Dry Bulb + Humidity) per month. 

For statistical purposes, am finding the correlation between the Power 
consumed and difference b/w the actual and the expected. 

For eg. If my room temp is 72F, and outside the Heat Index is 90F, 

Difference is 18F. Power Consumed is P1

If the outside temperature is 54F,

Difference is again 18F. Power consumed is P2. 

And there is a huge difference, as P1> P2. Always. Anything to be altered 
in the Heater Side of HVAC. 

And also please let me know on how to nullify the humidity control of HVAC 
in eQUEST!  The wizards do not have an option. And am unable to find it in 
the Detailed Edit. 

Am unable to attach the project file,as it is approximately 18Mb.  I will 
upload it in a common area and will update you with the link! 


Regards,
Siddharth Venkataraman
Tata Consultancy Services
Mailto: siddharth.v at tcs.com
Website: http://www.tcs.com
____________________________________________
Experience certainty.   IT Services
                        Business Solutions
                        Outsourcing
____________________________________________



From:
"Sami, Vikram" <Vikram.Sami at perkinswill.com>
To:
R B <slv3sat at gmail.com>, Siddharth V <siddharth.v at tcs.com>
Cc:
equest-users <equest-users at lists.onebuilding.org>
Date:
06/29/10 06:58 PM
Subject:
RE: [Equest-users] HVAC simulation



To follow up on Rohini's comments:
 
If your lights and equipment are on the 12/7 schedule, and you have a 
constant volume reheat then your supply volume is probably based on the 
peak condition, and anything below is reheat.  Did your cooling load also 
go down drastically when you switched to 12/7 mode?
 
Could you attach an inp file?
 
Vikram Sami, LEED AP
Sustainable Design Analyst
1382 Peachtree St. NE, Atlanta, GA 30309
t: 404-443-7462    f: 404.892.5823       e: vikram.sami at perkinswill.com   
www.perkinswill.com
Perkins+Will.  Ideas + buildings that honor the broader goals of society
 
-----Original Message-----
From: equest-users-bounces at lists.onebuilding.org [
mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of R B
Sent: Tuesday, June 29, 2010 8:56 AM
To: Siddharth V
Cc: equest-users
Subject: Re: [Equest-users] HVAC simulation
 
Depends on what kind of system you are using. looks like there is some
kind of reheat going on in the night hours during summer.
-rohini
 
On 6/29/10, Siddharth V <siddharth.v at tcs.com> wrote:
> Hi,
> 
> I am currently using eQUEST to simulate the performance of a building 
(an
> ideal case), where in the HVAC operates at the below temperatures 24x7 
for
> the whole year.
> 
> Below are the preset values:
> 
> Heat when temp <= 74F
> 
> Cool when temp >= 76F
> 
> Ideal temp of the building is 75F
> 
> Also cool, when the outside temp >=72F
> 
> 
> Error in Simulation:
> 
> I always see that the total heating power consumed in Jan/Dec month
> (Winter) is lesser than that July and August Month (Summers).
> 
> But the simulation's outside Dry Bulb Temperature (avg, min and max
> Temperature) is higher during July/August when compared to Jan/Dec 
month.
> 
> 
> If I operate the HVAC for 12x7 (7am to 7pm) for all the days, then it
> follows the seasonal pattern (heating power is higher in Jan/Dec than
> Jul/Aug).
> 
> But I need to get the power O/P when it operates for 24x7 only!
> 
> Please let me know as to why this error introduced, and how to rectify 
it!
> Or must I add some more details in the detailed edit.
> 
> 
> 
> Regards,
> Siddharth Venkatraraman
> Tata Consultancy Services
> Mailto: siddharth.v at tcs.com
> Website: http://www.tcs.com
> ____________________________________________
> Experience certainty.   IT Services
>                         Business Solutions
>                         Outsourcing
> ____________________________________________
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