https://orcid.org/0000-0002-2989-6213
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ABSTRACT
Energy consumption has skyrocketed during the past several decades due to the rapid growth of energy-intensive sectors. Fossil fuels provide a significant energy requirement but also have many undesirable side effects, including climate change. The world is currently focused on energy recovery and renewable energy research due to climate change and environmental concerns. So, recovering the heat that is wasted in industrial operations is an excellent way to reduce energy use. One of the most important ways to improve energy saving that is often overlooked is to reuse the heat generated by compressors. As a result, the primary focus of this study has been placed on an approach to recovering the heat that is generated by a multistage air compressor by making use of the appropriate heat recovery option. This review study is noteworthy in that it provides an explanation of the recovery of waste heat from a multistage air-compressor by making use of three main aspects of recovery. Many researchers have paid little attention to these three main aspects of recovery. The purpose of this study was to suggest cost-effective method for capturing heat from a multistage air-compressor. Finally, this study shows that in a compressed air system (CAS) a huge amount of energy, approximately 70% to 90%, is lost as waste heat. But implementing energy-saving indicators using proper waste heat recovery in the CASs can save 20% to 60%. Hence, using air compressor heat reduces energy costs and power usage by lowering energy value. This shows that this waste heat recovery system would offer a solution that is both cost-effective and efficient for capturing energy from the compressors and using it to heat the water for a range of purposes.
Nomenclature
| Symbols | = | |
| = | Specific heat (J/kg. K) | |
| ρ | = | Density (kg/m3) |
| V | = | Flow velocity (m3/s) |
| T | = | Temperature (K) |
| Q | = | Heat content (J) |
| q | = | Heat (J) |
| ΔT | = | Temperature difference (K) |
| Acronyms | = | |
| WHR | = | Waste Heat Recovery |
| CAS | = | Compressed Air System |
| GHG | = | Greenhouse gases |
| HEX | = | Heat Exchanger |
| BTU | = | British Thermal Unit |
| ORC | = | Organic Rankine Cycle |
| OFC | = | Organic Flush Cycle |
| TFC | = | Trilateral Flush Cycle |
| HE | = | Heat Engine |
| KC | = | Kalina Cycle |
| BC | = | Brayton Cycle |
| SE | = | Stirling Engine |
| SRC | = | Steam Rankine Cycle |
| = | carbon dioxide | |
| s | = | Supercritical Carbon Dioxide |
| WHTH | = | Waste Heat To Heat |
| WHTC | = | Waste Heat To Cold |
| WHTP | = | Waste Heat To Power |
| TES | = | Thermal Energy Storage |
Acknowledgements
I want to convey my sincere gratitude to Dr. Shilpa M. Vinchurkar ma’am, for her insightful advice and help with this paper’s planning and progress. My heartfelt gratitude also goes to Dr. Sachin Karale sir, Head Department of Mechanical Engineering, Dean of Research and Development, for his patient mentoring and enthusiastic support.
Disclosure statement
No potential conflict of interest was reported by the author(s).
Additional information
Notes on contributors
Rohit P. Sarode
Rohit P. Sarode received his Bachelor’s Degree in Mechanical Engineering from G. H. Raisoni College of Engineering and Management, which is affiliated to the Sant Gadge Baba Amravati University and his Master’s degree in Thermal Engineering from the School of Engineering and Technology, G.H.R.U., Amravati. He is pursuing his Ph.D. in Mechanical Engineering from the School of Engineering and Technology, G. H. Raisoni University, Amravati, Maharashtra, India. His area of research includes in Heat Transfer, Waste Heat Recovery, Energy Saving, Thermal Engineering, Cooling Towers, Multistage Air Compressors, etc.
Shilpa M. Vinchurkar
Shilpa M. Vinchurkar is an assistant professor at the Department of Mechanical Engineering, G. H. Raisoni College of Engineering, Nagpur. She received Ph.D. from GHRCE under Rastrasant Tukdoji Majaraj University, Nagpur. Her research interests include, but not limited to the following areas: Thermal Engineering, Mechanical Engineering Design, Mechanical Vibration, energy management, etc.