Sunday, February 24, 2019

Modeling, Design, and Testing of a Microchannel Split-System Air Conditioner

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A steady-state microchannel split-system simulation model has been developed based on previous research at the ACRC. This model was utilized as a design tool to optimize a microchannel split system with the goal of minimizing TEWI, or total equivalent warming impact. The system components were then selected and the optimized microchannel heat exchangers were fabricated. Next, the entire system was assembled and extensive tests were run at steady state conditions over a wide range of outdoor ambient conditions in a calorimeter test facility. The experimental results have been compared to the simulations for the purpose of model refinement and its eventual validation. The full system model overpredicts the total capacity of the system with a minimum error of 0.2%, a mean error of 5%, and a maximum error of 11 %. The evaporator submodel overpredicts the total capacity as well, with a minimum error of 0.7%, a mean error of 7%, and a maximum error of 11%. The condenser submodel also overpredicts with a minimum error of 0.5%, a mean error of 2%, and a maximum error of 6%. A major reason for the lower accuracy with the evaporator is because of the refrigerant maldisribution observed in the experiments. The model assumes perfect distribution, hence one reason for the overprediction of the system's capacity.

List of figures
List of tables
1. Introduction
1.1 Background
1.2 Microchannel heat exchangers
1.3 Scope of this report
2. Experimental facilities
2.1 Calorimeter test facility
2.2 Instrumentation
3. Experimental results and discussion
3.1 Introduction
3.2 Overall system performance
4. Summary and recommendations
Appendix A. Microchannel system design
Appendix B. Instrumentation and experimental facility
Appendix C. ACMCHX model documentation
Appendix D. ACMCHX simulation data

Author Details
"A. C. Kirkwood"

"C. W. Bullard"

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