CIBS Research
Explore the Research of CIBS
Development of a Semi-Empirical Compressor Model Accounting for Modulation and Extrapolation
- Project Team: Students: Kalen Gabel, Amjid Khan, Caleb Bengs Faculty: Craig R. Bradshaw
- Project Number: 21-11/AR-40
- Goals: Project aims to replace conventional regression-based models (e.g AHRI map) with a semi-empirical model that captures modulation and extrapolation for all positive displacement compressors
- Outcomes/Deliverables: This project will deliver: a new semi-empirical model, a populated, compressor performance database and machine learning algorithms for model development
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 model of unitary equipment in cooling mode, equipment test data, and a high-fidelity dynamic equipment model
Optimization of Ground Heat Exchanger Thermal and Hydraulic Design
- Project Team: Students: Timothy West; Faculty: Jeffrey D. Spitler
- Project Number: 22-05
- Goals: Project aims to develop automated methods for hydraulic design of ground heat exchangers (GHE), complementing recently developed automated thermal design methods.
- Outcomes/Deliverables: This project will deliver: a comprehensive GHE cost function, a hydraulic-circuiting algorithm based on graph theory, a pipe sizing interfaces, and simple user interface
Enabling Thermal Energy Storage to Accommodate Oklahoma Wind Energy-TriCoil as Cost Effective Means for Residential System Integration
- Project Team: Student: Farhan Istiaque, Khaled I. Alghamdi; Faculty: Christian K. Bach, Jeffrey D. Spitler
- Project Number: OCAST AR21-037
- Goals: This project will evaluate the TriCoil, anticipated to allow cost effective integration of diurnal timespan thermal energy storage with conventional AC or heat pump systems
- Outcomes/Deliverables: This project will evaluate the TriCoil, anticipated to allow cost effective integration of thermal energy storage with near conventional air conditioning or heat pump systems
Low GWP Refrigerant Evaluation for Fin-tube Coils - Difference in Coil and Simulation Model Performance
- Project Team: Student: Matin Ghadri; Faculty: Christian K. Bach, Craig R. Bradshaw
- Project Number: 21-05
- Goals: Project aims to investigate the required design changes for accommodating low-GWP refrigerants in fin-tube heat exchangers, including validation of the CIBS xFIn simulation model.
- Outcomes/Deliverables: This project will deliver high fidelity HX performance data sets, additional validation of the CIBS xFin simulation model, and updated heat exchanger design guidelines
Physics-Based Charge Models for Fin-Tube and Microchannel Heat Exchangers
- Project Team: Student: Abraham J. Lee; Faculty: Christian K. Bach, Craig R. Bradshaw
- Project Number: 22-03
- Goals: This project aims to increase charge prediction accuracy levels to better than 10% through an experimentally validated artificial neural network void fraction tuning, retaining physics.
- Outcomes/Deliverables: This project will deliver a high fidelity HX charge data set, and a validated ANN enhanced void fraction submodel for the CIBS xFin simulation model
Toward Optimal Secondary Furnace Heat Exchanger: Modeling of Furnace Combustion Gas Condensation
- Project: Students: Hyunjin Park; Faculty: Aaron Alexander, Christian Bach
- Project Number: 21-02
- Goals: Develop predictive lookup tables and correlations for heat transfer and condensation in furnace secondary heat exchangers
- Outcomes/Deliverables: This project will deliver: 1. a lookup table of heat transfer value for a range of tube diameters, inlet temperatures and mass flow rates, and trubulator twists; 2. correlations for heat transfer and condensation developed from the lookup tables
CIBS Publications
- 2022 Publications
Latif, H., Rahnama, S., Maccarini, A., Bradshaw, C. R., Nielsen, P., Hultmark, G., Afshari, A. 2022. Precision Ventilation for an Open-Plan Office: A Study of Variable Jet Interaction Between Chilled Beams. Sustainability 2022. 14, 11466.
Saleem, S., Bradshaw, C.R., Bach, C.K. 2022. Development of Design Guidelines for Fin-and-Tube Heat Exchangers with Low-GWP Refrigerants. International Journal of Refrigeration. 143 (2022) pp.166-181. (CIBS 21-05)
Saleem, S., Bradshaw, C.R., Bach, C.K. 2022. Performance assessment of R1234ze(E) as a low GWP substitute to R410A in fin-and-tube heat exchangers. International Journal of Refrigeration. 134 (2022) pp.253-264. (CIBS 21-05)
Tanveer, 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. 142 (2022) pp.111-126.
Orosz, J., Kemp, G., Bradshaw, C.R., Groll, E.A., 2022. Updated Performance and Operating Characteristics of a Novel Rotating Spool Compressor. In: Proceedings of the International Compressor Engineering Conference, Purdue University, West Lafayette, IN, USA. No 1119.
Tanveer, M., Bradshaw, C.R., Ding, X., Ziviani, D., 2022. Mechanistic Chamber Models: A Review of Geometry, Mass Flow and Heat Transfer Sub-Models and an Outlook to Future Research. In: Proceedings of the International Compressor Engineering Conference, Purdue University, West Lafayette, IN, USA. No 1180.
Saleem, S., Bradshaw, C.R., Bach, C., 2022. R1234ze(E) as a Low-GWP Replacement of R410A in Fin-and-Tube Evaporators. In: Proceedings of the International Refrigeration Engineering Conference, Purdue University, West Lafayette, IN, USA. No 2193. (CIBS 21-05)
Islam, M., Nicholas, J., Bradshaw, C.R., 2022. Development and Experimental Validation of a Mechanistic Chamber Model of a Novel Peristaltic Compressor. In: Proceedings of the International Compressor Engineering Conference, Purdue University, West Lafayette, IN, USA. No 1210.
Khan, A., Bradshaw, C.R., 2022. Quantitative Comparison of the Performance of Vapor Compression Cycles with Various Means of Compressor Flooding. In: Proceedings of the International Compressor Engineering Conference, Purdue University, West Lafayette, IN, USA. No 1227.
Ghadiri, M., Bach, C., Bradshaw, C.R.„ 2022. R468C as a Low-GWP Replacement of R410A in Fin-and-Tube Evaporators. In: Proceedings of the International Refrigeration Engineering Conference, Purdue University, West Lafayette, IN, USA. No 2262. (CIBS 21-05)
Lee, A., Bach, C., Bradshaw, C.R.„ 2022. Differential Mass Evacuation Sampling Method for Measuring Refrigerant Charge in Round Tube Plate Fin Heat Exchangers (ASHRAE RP-1785). In: Proceedings of the International Refrigeration Engineering Conference, Purdue University, West Lafayette, IN, USA. No 2273.
Gabel, K., Bradshaw, C.R., 2022. Evaluation And Quantification Of Semi-Empirical Compressor Model Predictive Capabilities Under Modulation And Extrapolation Scenarios. In: Proceedings of the International Compressor Engineering Conference, Purdue University, West Lafayette, IN, USA. No 1318. (CIBS 21-11)
Tanveer, M., Bradshaw, C.R., Orosz, J, Kemp, G., 2021. Optimum Spool Compressor Aspect Ratio for R134a and R1234ze(E). In: Proceedings of the International Compressor Engineering Conference, Purdue University, West Lafayette, IN, USA. No 1379.
Yousaf, S., Bradshaw, C.R., Kamalapurkar, R., San, O., 2022. Physics Informed Machine Learning Based Reduced Order Model of Unitary Equipment. In: Proceedings of the International Refrigeration Engineering Conference, Purdue University, West Lafayette, IN, USA. No 2386. (CIBS AR-042)
Waikar, A., Rowinski, D., Kemp, G., Orosz, J., Bradshaw, C.R., 2022. Modeling a Spool Compressor Using a Coupled Fluid And Solid Solver With Cut-Cell Based CFD Methodology With Adaptive Mesh Refinement. In: Proceedings of the International Compressor Engineering Conference, Purdue University, West Lafayette, IN, USA. No 1140.
(CIBS 22-05)
(CIBS AR21-037)
- 2021 Publications
Saleem, S., Bradshaw, C.R., Bach, C.K., 2021. Validation of a multi-circuit heat exchanger model for evaluating the effect of refrigerant circuitry on cross-fin conduction in evaporator mode . International Journal of Refrigeration. 131 (2021) pp.623-633. (CIBS 21-05)
Islam, M., Tubbs, C., Bengs, C, Bradshaw, C.R.„ 2021. Development of a Reconfigurable Prototype Peristaltic Compressor. In: IOP Conference Series: Materials Science and Engineering: International Conference on Compressors and their Systems. 1180.
Liu, X., J. D. Spitler, M. Qu and L. Shi. 2021. Recent Developments in the Design of Vertical Borehole Ground Heat Exchangers for Cost Reduction and Thermal Energy Storage Journal of Energy Resources Technology 143(10).
(CIBS 22-05)
Yarborough, S., Bradshaw, C.R., Orosz, J., Kemp, G. 2021. Empirical Indicated Loss Analysis of a
Tanveer, M., Bradshaw, C.R. 2021. Performance Evaluation of Low-GWP Refrigerants in 1-100 ton
scroll compressors. International Journal of Refrigeration. 129 (2021), pp.317-331.
Islam, M., Tubbs, C., Bengs, C, Bradshaw, C.R.„ 2021. Development of a Reconfigurable Prototype
Peristaltic Compressor. IOP Conference Series: Material Science Engineering. Vol. 1180. 012046.
Tanveer, M., Bradshaw, C.R.„ 2021. Scaling Method for Scroll Compressor Geometry Based on
Manufacturing and Performance Constraints. In: Proceedings of the International Conference on
Compressors and their Systems, City University, London, UK.
Tanveer, M., Bradshaw, C.R.„ 2021. Performance Evaluation of low-GWP Refrigerants in 1-100
Ton Scroll Compressors. In: Proceedings of the International Conference on Compressors and their
Systems, City University, London, UK.
Lee, A., Bach, C., Bradshaw, C.R.„ 2021. Differential Mass Evacuation Sampling Technique for
Measuring Refrigerant Charge and Oil Retention of Round Tube Plate Fin Heat Exchangers
(ASHRAE RP-1785). In: Proceedings of the International Refrigeration Engineering Conference,
Purdue University, West Lafayette, IN, USA. No 2124.
Saleem, S., Bradshaw, C.R.„ 2021. The Thermodynamic Behavior Of Low-GWP Zeotropic
Mixtures On Water-Source Heat Pump Equipment. In: Proceedings of the International
Refrigeration Engineering Conference, Purdue University, West Lafayette, IN, USA. No 2151.
Saleem, S., Sarfraz, S. Bach, C., Bradshaw, C.R.„ 2021. A Novel Experimental Infrastructure for
Collecting High-Fidelity Experimental Data for Refrigerant to Air Heat Exchangers. In:
Proceedings of the International Refrigeration Engineering Conference, Purdue University, West
Yarborough, S., Bradshaw, C.R., Orosz, J, Kemp, G., 2021. Empirical Indicated Loss Analysis of a
Semi-hermetic Light-Commercial Spool Compressor . In: Proceedings of the International
Compressor Engineering Conference, Purdue University, West Lafayette, IN, USA. No 1236.
Tanveer, M., Bradshaw, C.R.„ 2021. Quantitative and Qualitative Evaluation of Various
Positive-Displacement Compressor Modeling Platforms. In: Proceedings of the International
Compressor Engineering Conference, Purdue University, West Lafayette, IN, USA. No 1248.
Islam, M., Bradshaw, C.R.„ 2021. Development of Mechanistic Chamber Model of a Novel
Peristaltic Compressor for Air-conditioning and Refrigeration Applications. In: Proceedings of the
International Compressor Engineering Conference, Purdue University, West Lafayette, IN, USA.
- 2020 Publications
Tanveer, M., Bradshaw, C.R. 2020. Quantitative and Qualitative Evaluation of Various
Positive-Displacement Compressor Modeling Platforms. International Journal of Refrigeration.
Sarfraz, O., Bach, C.K., Bradshaw, C.R. 2020. Validation of advanced fin-and-tube heat exchanger
models with cross-fin conduction functionality. International Journal of Refrigeration. 116 (2020),
Lee, A., Bach, C.K., Bradshaw, C.R. 2020. Differential Mass Evacuation Sampling Technique for
Measuring Oil Retention and Refrigerant Charge of Round Tube Plate Fin Heat Exchangers
(ASHRAE RP-1785). Science and Technology for the Built Environment. 26 (2020), pp.790-804.
Saleem, S., Sarfraz, O., Bach, C.K., Bradshaw, C.R. 2020. Development of novel experimental
International Journal of Refrigeration. 114 (2020), pp.189-200.
Singleton, J., Schmidt, D. Bradshaw, C.R. 2020. Control and commissioning of a hot-gas bypass
compressor load stand for testing light-commercial compressors on low-GWP refrigerants.
International Journal of Refrigeration. 112 (2020), pp.82-89.
- 2019 Publications
Sarfraz, O., Bach, C.K., Bradshaw, C.R. 2019. A novel technique for computationally efficient
consideration of cross-fin conduction in fin-and-tube heat exchanger models. International Journal
of Refrigeration. 107 (2019), pp.73-83
Lee, A., Bach, C., Bradshaw, C.R., 2019. Study of Heat Exchanger Inlet Air Velocity Distribution
for Ducted Tests in a Psychrometric Chamber (ASHRAE RP-1785) . In: ASHRAE Transactions,
Atlanta. Vol 125 (2019). pp. 198-205.
Sarfraz, O., Bach, C.K., Bradshaw, C.R. 2019. Reduced order modeling for multi-circuit
fin-and-tube heat exchangers with multiple identical circuit types. International Journal of
Refrigeration. 106 (2019), pp. 236-247.
Sarfraz, O., Bach, C.K., Bradshaw, C.R. 2019. Discrete modeling of fin-and-tube heat exchangers
with cross-fin conduction functionality. International Journal of Refrigeration. 104 (2019), pp.
Schmidt, D., Singleton, J., Bradshaw, C.R. 2019. Development of a Light-Commercial Compressor
Load Stand to Measure Compressor Performance using Low-GWP Refrigerants. International
Journal of Refrigeration. 100(April 2019), 443-453.
Singleton, J., Schmidt, D. Bradshaw, C.R., 2019. Control and Commissioning of a Hot Gas Bypass
Compressor Load Stand for Testing Light-Commercial Compressors on Low-GWP Refrigerants .
In: 11th International Conference on Compressors and their Systems, City University, London,
Lee, A., Bach, C., Bradshaw, C.R., 2019. Study of Heat Exchanger Inlet Air Velocity Distribution
for Ducted Tests in a Psychrometric Chamber (ASHRAE RP-1785) . In: ASHRAE Transactions,
Atlanta. Vol 125 (2019). pp. 198-205.
- 2018 Publications
Sarfraz, O., Bach, C., Bradshaw, C.R. 2018. A Literature Review of Numerical Modeling
Techniques for Vapor Compression Systems with Focus on Heat Exchanger Modeling. In:
Proceedings of the International Refrigeration and Air Conditioning Conference, Purdue University,
West Lafayette, IN, USA. No 2439.
Schmidt, D., Singleton, J., Bradshaw, C.R., 2018. Development of a light-commercial compressor
load stand to measure compressor performance using low-GWP refrigerants. In: Proceedings of the
International Compressor Engineering Conference, Purdue University, West Lafayette, IN, USA.
Lee, J., Bach, C., Bradshaw, C.R., 2018. Experimental validation of refrigerant charge models in
coils for residential split systems. In: Proceedings of the International Refrigeration and Air
Conditioning Conference, Purdue University, West Lafayette, IN, USA. No 2670.