[Equest-users] 回复： RE: 回复：[Equest-users ] Thermal storage tank doesn't work belo w zero degree

[WangWendy]

enclosed are the screenshot. You may see both the water side system and the propertites panel of storage tank. Charge temperature now is 32 F( 0 C) due to the reason i mentioned. Another two attachement are the screenshot of charge loop and discharge loop.


 



From: 503271081 at qq.com
To: silver_mirror at msn.com; equest-users at lists.onebuilding.org
Subject: 回复： RE: 回复：[Equest-users ] Thermal storage tank doesn't work belo w zero degree
Date: Fri, 31 May 2013 17:59:53 +0800

can you provide the water side system screenshot in eQUEST or attach your inp and pd2 file in Email. 




------------------ 原始邮件 ------------------

发件人: "WangWendy"; 
发送时间: 2013年5月31日(星期五) 下午5:54
收件人: "冷面寒枪"; "Equest-users at lists.onebuilding.org"; 
主题: RE: 回复：[Equest-users ] Thermal storage tank doesn't work belo w zero degree




Of course I've set the maximum rate per design value. My problem here is the actual rate doesn't equal to the supposed value. As i mentioned below, the actual discharge/charge load/rate is zero when the entering/leaving temperature is below 0 degree. I don't think the problem comes from wrong setting of discharge/charge rate.

Any other possibility besides the charge/discharge rate?

Thank you all the same.





From: 503271081 at qq.com
To: silver_mirror at msn.com; equest-users at lists.onebuilding.org
Subject: 回复：[Equest-users] Thermal storage tank doesn't work below zero degree
Date: Fri, 31 May 2013 17:32:17 +0800




you must Specifies the maximum rateat which the storage component can discharge and discharge 。
 




------------------ 原始邮件 ------------------

发件人: "WangWendy"; 
发送时间: 2013年5月31日(星期五) 下午2:55
收件人: "Equest-users at lists.onebuilding.org"; 
主题: [Equest-users] Thermal storage tank doesn't work below zero degree





Hello everyone
 
This problem came across when I was modelling an ice-storage system. Hourly report said the charge and discharge load are both zero, which means the tank doesn’t work under the setting condition. The supposed entering temperature of the tank is -6℃ and is leaving at -3℃. Freeze temp is below -10℃. In order to run the simulation, I have to raise the charge/discharge temperature as well as the loop temperature of charge loop up above 0℃. When the charge temperature is above or  equal to zero, the tank does work. However it changes the performance of double duty chillers under ice-making mode, since the curve of chiller is different with different leaving temperature, leading to a bigger assigned load of double duty chiller than the max charge load and less accurate results.
 
Does anyone have any thoughts how to solve this problem? Making storage tank work below 0℃ at setting temperature? Or is this the limit of eQuest software yet to be solved?
 
Many thanks
 
Wendy 		 	   		  
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