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
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
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Mayank,
Pls check your charging sch & discharging sch, this may help.
Kevin
???: Mayank Bhatnagar [mailto:mayank.23aug at gmail.com]
????: 2014?4?24? 13:29
???: equest-users at lists.onebuilding.org
??: [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
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