Coupling a two-stage absorption heat transformer with finite heat sources and sinks |
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| Affiliation: | 1. Dipartimento di Ingegneria chimica e alimentare, Università di Salerno, via Ponte Don Melillo, 84084 Fisciano (SA, Italy;2. Dipartimento di Ingegneria chimica, Università di Napoli Federico II, p. le V. Tecchio, 80125 Napoli, Italy;1. Graduate School of Science and Technology, Hirosaki University, Bunkyocho, Hirosaki, Japan;2. Energy Conversion Engineering Laboratory, Institute of Regional Innovation, Hirosaki University, Matsubara, Aomori, Japan;3. Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, China;1. Department of Chemical and Materials Engineering, National Kaohsiung University of Science and Technology, Kaohsiung, Taiwan;2. Key Laboratory of Advanced Materials for Energy and Environmental Applications, Lac Hong University, Bien Hoa, Vietnam;3. Center of Excellence for Green Energy and Environmental Nanomaterials, Nguyen Tat Thanh University, Ho Chi Minh City, Vietnam;4. Department of Chemical and Biological Engineering, University of Saskatchewan, Saskatoon, Saskatchewan, Canada;5. Institute of Research and Development, Duy Tan University, Da Nang, Vietnam;1. School of Chemical Engineering and Physical Science, Lovely Professional University, Phagwara, India;2. Center of Excellence for Green Energy and Environmental Nanomaterials, Nguyen Tat Thanh University, Ho Chi Minh City, Vietnam;3. University of Education, Vietnam National University, Cau Giay, Vietnam;1. Adelan Ltd, Birmingham, United Kingdom;2. Institute for Future Transport and Cities, Coventry University, Coventry, United Kingdom;1. Center for Applied Energy Research, University of Kentucky, Lexington, Kentucky, United States;2. Department of Biomedical Engineering and Chemical Engineering, The University of Texas at San Antonio, San Antonio, Texas, United States;3. John Jay Science and Engineering Academy, San Antonio, Texas, United States;4. Samuel V. Champion High School, Boerne, Texas, United States;5. Department of Mechanical Engineering, The University of Texas at San Antonio, San Antonio, Texas, United States |
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| Abstract: | The coupling among a two-stage heat transformer (TSHT) and finite heat sources and sinks is considered. A novel configuration is proposed, in which the evaporator of the second stage is fed both by the absorber of the first stage and by the external source. A lumped-parameter mathematical model is used to compute the performance of the proposed TSHT. It has been found that the range of applicability is widened, when compared with the usual configuration. Moreover, the use of a two-stage apparatus allows one to noticeably increase the performance compared with that obtainable with a simpler single-stage transformer. Thus, it is possible to increase the output heat and/or the user temperature, to reduce the discharge temperature, or to use lower quality energy sources. The results also allow one to draw some more general conclusions on the applicability of absorption heat transformers of different configurations, when different heat sources/sinks are considered. |
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