Abstract
This paper presents two enhanced robust control strategies for building chilled water systems in order to enhance their overall energy performances. A fault-tolerant control strategy for secondary chilled water pumps is proposed to avoid the low temperature difference syndrome and deficit flow problem. This strategy employs the flow-limiting technique that can ensure the water flow of secondary loop not exceed that of the primary loop while still maintaining highest possible delivery capacity of cooling to terminals. This paper also presents an adaptive optimal control strategy for complex chilled water systems involving intermediate heat exchangers. This optimal control strategy determines the optimal settings of the heat exchanger outlet water temperature (hot side) and the required operating number of heat exchangers and pumps in order to minimize the total energy consumption of pumps under varying working conditions. Results show that both of the two strategies have enhanced control robustness and reliability, particularly in avoiding deficit flow problem. Significant energy of chilled water pumps is saved when compared with conventional methods.
Original language | English |
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Title of host publication | 6th Asian Conference on Refrigeration and Air Conditioning, ACRA 2012 |
Publisher | Chinese Association of Refrigeration (CAR) |
Pages | 77-84 |
Number of pages | 8 |
ISBN (Print) | 9781632660152 |
Publication status | Published - 1 Jan 2012 |
Event | 6th Asian Conference on Refrigeration and Air Conditioning, ACRA 2012 - Xi'an, China Duration: 26 Aug 2012 → 28 Aug 2012 |
Conference
Conference | 6th Asian Conference on Refrigeration and Air Conditioning, ACRA 2012 |
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Country/Territory | China |
City | Xi'an |
Period | 26/08/12 → 28/08/12 |
Keywords
- Adaptive optimal control
- Chilled water system
- Deficit flow
- Energy efficiency
- Fault-tolerant control
ASJC Scopus subject areas
- Electrical and Electronic Engineering