[Equest-users] 回复： DHW loads difference

[冷面寒枪]

Hi，pramod
  You can compare  pv-a and ps-c report of propose case with baseline case.Maybe you can find some key factors that cause this problem.

Yongqing zhao
  ------------------
  赵永青
 长沙绿建节能科技有限公司
长沙市韶山中路438号 
电话:13574805636
 Email:zhaoyongqing1987 at 126.com
          503271081 at qq.com 


  
  

 

 ------------------ 原始邮件 ------------------
  发件人: "冷面寒枪";<503271081 at qq.com>;
 发送时间: 2015年1月12日(星期一) 晚上10:03
 收件人: "Pramod .D"<d.pramod at setty.com>; 
 
 主题: 回复：[Equest-users] DHW loads difference

 

 Hi，pramod
  You can compare  pv-a and ps-c report of propose case with baseline case.Maybe you can find some key factors that cause this problem.

Yongqing zhao

  
  ------------------
  赵永青
 长沙绿建节能科技有限公司
长沙市韶山中路438号 
电话:13574805636
 Email:zhaoyongqing1987 at 126.com
          503271081 at qq.com 


  
  

 

 ------------------ 原始邮件 ------------------
  发件人: "冷面寒枪";<503271081 at qq.com>;
 发送时间: 2015年1月12日(星期一) 晚上10:00
 收件人: "Pramod .D"<d.pramod at setty.com>; 
 
 主题: 回复：[Equest-users] DHW loads difference

 

Hi，pramod
  You can compare  pv-a and ps-c report of propose case with baseline case.Maybe you can find some key factors that cause this problem.

Yongqing zhao

 ---原始邮件---
  发件人: "Pramod .D"<d.pramod at setty.com>
 发送时间: 2015年01月12日 21:42:47
 收件人: "Byron Burns"<B.Burns at ha-inc.com>;"equest-users at lists.onebuilding.org"<equest-users at lists.onebuilding.org>;
 主题: Re: [Equest-users] DHW loads difference


  
Byron,
 
 
 
Thanks for your immediate reply. I have compared all the schedules, volume, capacity, tanks loss, etc. Everything is same but I am getting difference in results. Please help me out on this and thanks for the manual.
 
 
  
Thanks,
 
 
 
Pramod D | Junior Energy Analyst
 
d.pramod at setty.com

 
 
   
From: Byron Burns [mailto:B.Burns at ha-inc.com] 
Sent: Monday, January 12, 2015 7:04 PM
To: Pramod .D; equest-users at lists.onebuilding.org
Subject: RE: DHW loads difference


 
 
 
Hello Pramod,
 
 
 
You should be able to get the results to line up, if you are interested in the algorithm used, here is a link to the engineering manual.  Generally, the DHW energy is modeled just like a process load with a few more knobs (hourly demand * fractional schedule)/DHW efficiency + standby loss.  There is a portion of the calculation that accounts for the tank loss, which is a factor of the size of the tank, the amount of insulation on the tank and the ambient conditions, so make sure both the baseline and proposed models have the same volume, amount of insulation and are located in the same zone.
 
 
 
To ensure it is not something simple, I would recommend re-inputting the data and running it again.  You will notice that eQ rounds many of the inputs in the GUI, however it will input the actual values into the .inp file and .bld file when you run it, so make sure all inputs are the same regardless of how they are displayed.  Also the schedules are a common cause of these issues.  I recommend using something to compare the inputs of both your baseline and proposed .inp files to ensure they are the same.  Personally, I like Notepad++, it has a compare plug in that makes it a snap.
 
 
 
Hope that helps,
 

Byron D. Burns, EIT, BEMP 
Energy Engineer, Building Sciences Studio 

H&A | Hankins & Anderson | www.ha-inc.com 
d: (804) 420-1622 p: (804) 285-4171 f: (804) 217-8520 
   
From: Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Pramod .D
Sent: Monday, January 12, 2015 7:51 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] DHW loads difference


 
 
 
Hi,
 
 
 
I have modelled an apartment using eQuest. I have given the same inputs (capacities, schedules,etc) in both the models for DHW but I am getting difference in the results. Can anyone please tell how eQuest calculates DHW loads. Why I am getting difference in DHW loads. The images are attached.
 
 
 
Thanks,
 
Pramod
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