[Equest-users] Thermal storage modeling issues: high cooling capacity and unmet hours

[Soham Babu]

Mayank,
The using of thermal storage system in which an ice storage tank allows ice to accumulate during one period, and then thaws it for use during another. Since the unmet hours high try to increase your thermal storage capacity, also check in which space the unmet hrs are more and try to improve the supply cfm in zone air flow tab, also increase the size ratio in the system…

Soham Babu |  Project Lead

[setty-logo]

| Fairfax, VA | Washington, DC | Baltimore, MD | New York, NY | Mysore, India
| M/E/P/FP Design Engineering | Project Management | Energy Management Services | Construction Management | Design-Build Services | Commissioning
| Voice 703.691.2115 Ext. 135 | Fax 703.691.8084 | Cell 984.411.2737 | soham.babu at setty.com<mailto:soham.babu at setty.com> | www.setty.com<http://www.setty.com/>

This e-mail and any files transmitted with it are confidential and are intended solely for the use of the individual or entity to whom they are addressed. If you are NOT the intended
recipient or the person responsible for delivering the e-mail to the intended recipient, be advised that you have received this e-mail in error and that any use, dissemination, forwarding,
printing or copying this e-mail is strictly prohibited.
From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Mayank Bhatnagar
Sent: 24 April 2014 10:59
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Thermal storage modeling issues: high cooling capacity and unmet hours

Dear eQuest users,

I need help in thermal storage modelling. The issue which I have faced is:

The project have 4 chiller (2200 TR each). To reduce peak load in day time, I have modeled thermal storage of 8000 TR-h (95 MBTU) with charging and discharging rate at 11.9 MBTU/h and 12 MBTU/h. To size each chiller capacity, I modeled chillers as autosize in both case (with and without thermal storage).

When there is no thermal storage the chiller sizing is 2386 TR each (4 chiller) with zero unmet hours and When I modeled thermal storage and a chiller dedicated to thermal storage and other three are working as supporting to thermal storage. The chiller size in this case are 3 chillers of 3496 TR and one chiller of 1026 TR and 5467 unmet hours.


I am following procedure as mentioned in tutorial (attached). However, I got unmet hours and higher cooling tonnage than without thermal storage case.

Please help me to sort out this problem.

Regards,
Mayank Bhatnagar
Energy Analyst
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20140424/5474dff2/attachment-0002.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image001.png
Type: image/png
Size: 2749 bytes
Desc: image001.png
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20140424/5474dff2/attachment-0002.png>