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Explore the Research of CIBS2023

Project AR-42 graphix


Development of Reduced-order System Models for Next Generation Comfort Cooling Equipment
  • Project Team: Students: Shahzad Yousaf, Mohsin Tanveer; Faculty: Craig R. Bradshaw, Rushikesh Kamalapurkar, Omer San
  • Project Number: AR-42
  • Goals: This project aims to develop reduced order models for variable speed unitary equipment to support development of equipment maps, building energy models, and model-predictive optimal control.
  • Outcomes/Deliverables: This project will deliver: a reduced-order black-box model, a reduced-order gray-box model, equipment test data, and a high-fidelity dynamic equipment model. 
  • Scholarship(s): Yousef, S., Bradsaw, C. R., Kamalapurkar, R., & San, O. (2022). "Physics Informed Machine Learning Based Reduced Order Model of Unitary Equipment”. International Refrigeration and Air Conditioning Conference. Paper 2417;
    Yousaf, S., Bradshaw, C. R., Kamalapurkar, R., & San, O. (2023). “Investigating critical model input features for unitary air conditioning equipment”. Energy and Buildings, 284, 112823
Project 22-03-02 graphic
Physics-Based Charge Models for Low-GWP Refrigerants in Heat Pump Applications
  • Project Team: Students:Amr Abdelmoneim, Abraham Lee: Faculty: Christian Bach, Craig R. Bradshaw
  • Project Number: 22-03-02
  • Goals: Project aims to increase fin-tube heat exchanger charge models’ prediction accuracy to better than 10% for low-GWP refrigerants through an experimentally validated void fraction model
  • Outcomes/Deliverables: This project will deliver: Refrigerant charge data set for a member selected subset of heat exchangers, and void-fraction models validated for select heat exchangers and refrigerants
  • Scholarships: Lee, A. J., C. K. Bach, C. R. Bradshaw (2023). An Experimental Data-Driven Charge Model for Round-Tube-Plate-Fin Heat Exchangers Using Low-GWP Refrigerants. Submitted to JIJR on 03/07/2023; Lee, A. J., C. K. Bach, C. R. Bradshaw (2023). Development of Multi-Objective Optimization Framework for Reducing Refrigerant Charge and Increasing Cooling Capacity of a Heat Pump. Submitted to JIJR on 03/12/2023.


OCAST AR-37 graphic
Enabling Thermal Energy Storage to Accommodate Oklahoma Wind Energy- TriCoil as Cost Effective Means for Residential System Integration
  • Project Team: Student: Khaled I. Alghamdi;                                        Faculty: Christian K. Bach, Jeffrey D. Spitler
  • Project Number: OCAST AR37-22
  • Goals: This project will evaluate a novel three-fluid fin-and-tube heat exchanger (TriCoil™) for cost effective integration of thermal energy storage with conventional air conditioning or heat pump systems
  • Outcomes/Deliverables: This project will evaluate technical feasibility through a prototype system, and economic viability through in-depth coupled building and thermal storage simulation study
  • Scholarship(s): Alghamdi, K. I., Bach, C. K., Spitler, J. D., & Istiaque, F., 2023. Modeling, Simulating, and Validating a Novel Three-Fluid Heat Exchanger (Tricoil™) for a Residential Heating and Air-Conditioning System Integrating Water-Based Thermal Energy Storage. Available at SSRN:; Alghamdi, K. I., Bach, C. K., & Spitler, J. D., 2022. Water-Based Thermal Energy Storage for Heating and Air-Conditioning Applications in Residential Buildings: Review and Preliminary Study. International Refrigeration and Air Conditioning Conference. Paper 2345.


Project 23-01 graphic
Development of a Vapor Injected and Refrigerant Flexible Semi-Empirical Compressor Model
  • Project Team: Student: Amjid Khan; Faculty: Craig R. Bradshaw
  • Project Number: 23-01
  • Goals: This project aims to develop a reduced order semi-empirical model for vapor injected compressor that has the potential to predict the performance against variation in refrigerant properties 
  • Outcomes/Deliverables: This project will deliver a refrigerant flexible vapor injected compressor model, automation upgrade to compressor load stand, and high-fidelity experimental data for various compressor technologies
  • Scholarships: Khan, A., Bradshaw, C. R., (2022). “Quantitative Comparison of the Performance of Vapor Compression Cycles with Various Means of Compressor Flooding”, International Compressor Engineering Conference,; Amjid Khan, Craig Bradshaw (2023), “Quantitative Comparison of the Performance of Vapor Compression Cycles with Compressor Vapor or Liquid Injection”, International journal of refrigeration. (Under Review)


Project 23-01 graphic


Compressor Technology Evaluation for Heat Pumps using Low-GWP Working Fluids
  • Project Team: Student: Mohsin Tanveer;                        Faculty: Craig R. Bradshaw
  • Project Number: 23-02
  • Goals: This project aims to iaddress low-GWP refrigerants and decarburization challenges by tacking the following research question, What makes a good heat pump compressor?" 
  • Outcomes/Deliverables: This project will deliver a final code of scaling analysis, geometry optimization, and scroll, rotary, and spool compressors, as well as a dataset of validation information for scroll and rotary compressors
  • Scholarship: Tanveer, M. M., & Bradshaw, C. R. (2020). Quantitative and qualitative evaluation of various positive-displacement compressor modeling platforms. International Journal of Refrigeration119,48-63., Tanveer, M. M., & Bradshaw, C. R. (2021). Performance evaluation of low GWP refrigerants in 1-100 ton scroll compressors. International Journal of Refrigeration, 129, 317-331., Tanveer, M. M., Bradshaw, C. R., Ding, X., & Ziviani, D. (2022). Mechanistic chamber models: A review of geometry, mass flow, valve, and heat transfer sub-models. International Journal of Refrigeration., Tanveer, Tanveer, M. Mohsin, and Craig R. Bradshaw. “Pseudo-Optimum Geometries for 1-100 Ton Spool Compressors with Low-GWP Refrigerants." International Journal of Refrigeration (accepted).
Application of split circuits with varying split location to optimize heat transfer to pressure-drop tradeoff.
Performance Evaluation of Refrigerants with High Temperature Glide - Measurements and Design Guidelines
  • Project Team: Students: Matin Ghadiri Yazdi;                        Faculty: Christian Bach, Craig R. Bradshaw
  • Project Number: 23-04
  • Goals: Improve the ratio of pressure drop vs. heat transfer of fin tube heat exchangers by adjusting elemental circuitry design using splitters
  • Outcomes/Deliverables: This project will deliver performance data for fin-tube HXs with low-GWP refrigerants, validation of CIBS XFIN heat exchanger model, and design guidelines for low-GWP zeotropic fluid HXs
  • Scholarship: Ghadiri, M., C. K. Bach, C. R. Bradshaw (2022). R468C as a Low-GWP Replacement of R410A in Fin-and-Tube Evaporators. International Refrigeration and Air Conditioning Conference.
23-06 Project summary graphic
Benefits of Secondary Loop Systems:  Thermal Storage and Demand Response
  • Project Team: Students: Pouria Moghimi;                        Faculty: Jeffrey D. Spitler, Christian Bach
  • Project Number: 23-06
  • Goals: Develop experimental testbed and validated simulation model of buried thermal energy storage tanks that can be installed with a backhoe-mounted augur
  • Outcomes/Deliverables: This year, the anticipated outcomes are a partially-validated simulation model, a suite of experimental results that can be used for validation, and an evaluation of techno-economic feasibility
  • Scholarship: N/A yet
23-07 Project summary graphic
Solar-powered ultra-low-GWP heat pumps with DC compressors and TES
  • Project Team: Students:Gabriel Parker;                           Faculty: Jeffrey D. Spitler, Craig R. Bradshaw, Ardeshir Moftakhari
  • Project Number: 23-07
  • Goals: Develop innovative system configurations, appropriate for use in a near zero-energy house, that make use of thermal energy storage, air-to-water heat pumps with alternative refrigerants, and grid or local solar photovoltaic power
  • Outcomes/Deliverables: This year, the anticipated outcomes are a simulation model, a proposed design for a tiny-house demonstration system, and experimental testing of the components
  • Scholarship: N/A yet

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