| Autor: |
Amy Xia, Prabhakar Subrahmanyam, Pooya Tadayon, Ying-Feng Pang, Arun Krishnamoorthy |
| Rok vydání: |
2021 |
| Předmět: |
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| Zdroj: |
2021 20th IEEE Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems (iTherm). |
| DOI: |
10.1109/itherm51669.2021.9503229 |
| Popis: |
The thermal efficiency of cascading crossflow heat exchangers (HEX), networked in a parallel fashion to a cold plate, is investigated experimentally and computationally. A microcontroller is connected to the manifold system that dynamically branches coolant flow to multiple heat exchangers based on package power and its consequential junction temperature rise (Tj rise ) feedback from the heat dissipating device. Branching the recirculating coolant flow dynamically to multiple heat exchangers on a single cold plate for a heater dissipating 1kW of power, yielded a temperature reduction of 16°C compared to recirculating the coolant to just one HEX. Efficiency (η) of HEXs are characterized and a new efficiency parameter (T eff ) is proposed for characterizing heat exchanger efficiencies as an alternate to conventional HEX efficiency methods. Experimental data for a 1kW scenario on one HEX yields a system efficiency (η) of 67% and for 4 HEXs at identical power, it results in a system efficiency of 92.7%, which is a remarkable 25.7% improvement in the overall thermal efficiency of the system. A new efficiency parameter (T eff ) for HEX is introduced in this research not just to characterize the efficiency of HEX but is also proposed as an efficient compact modeling tool that reduces mesh count in the model as well. This has been adequately explained in this paper. A plug and play, adaptive, coolant flow branching system that removes human intervention and dynamically optimizes thermal efficiency based on real-time changing power conditions and achieving a junction temperature target is implemented and presented in this research. When implemented in data centers, this is projected to optimize TCO (Total Cost of Ownership) at the rack level and for large scale deployment & adoption. This method consequentially improves the overall Power Usage Effectiveness (PUE) of a data center. There have been numerous ways proposed to characterize heat exchanger efficiency specific to the design and analysis of how it is built. The proposed method is novel to the design of cascading network of crossflow heat exchangers where efficiency is shown to be closer to 100% compared to other methods. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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