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Simulation and optimization of water-based hybrid VRF systems with bifurcating bare-tube heat exchangers.

Number: pap. n. 1112

Author(s) : HUANG R., HUANG Z., LING J., et al.

Summary

Hybrid VRF (hVRF) systems enjoy reduced refrigerant charge and wider selection of refrigerants compared to traditional VRF systems. However, due to relatively low heat transfer rate in the indoor coil, hVRF system COP was reported to be 10% lower than a traditional VRF system COP. To solve the COP degradation problem of hVRF system, a bi-objective optimization method was proposed for a water-based hVRF system that uses bifurcating bare-tube heat exchangers (bBTHX) as the indoor coils. The two objectives are minimizing bBTHX envelop volume and maximizing system COP. The optimization problem is separated into two steps. First, refrigerant loop parametric analysis was performed to determine the optimal water loop operating conditions. Next, bBTHX optimization was conducted subjected to the constraints of capacity requirements from step one and dimension limitations. Then we simulated the entire hVRF system with the optimal bBTHX designs and obtained the Pareto front between system COP and bBTHX volume. The results show that comparing with VRF direct expansion system, hVRF system suffered 10% COP degradation with tube-fin indoor unit, and 4% COP degradation with the bBTHX.

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Pages: 8

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Details

  • Original title: Simulation and optimization of water-based hybrid VRF systems with bifurcating bare-tube heat exchangers.
  • Record ID : 30026779
  • Languages: English
  • Source: Proceedings of the 25th IIR International Congress of Refrigeration: Montréal , Canada, August 24-30, 2019.
  • Publication date: 2019/08/24
  • DOI: http://dx.doi.org/10.18462/iir.icr.2019.1112

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