Study on a re-heat two-stage adsorption chiller – The influence of thermal capacitance ratio,overall thermal conductance ratio and adsorbent mass on system performance |
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| Affiliation: | 1. Graduate School of Bio-Applications and Systems Engineering, Tokyo University of A&T, 2-24-16, Naka-machi, Koganei-shi, Tokyo 184-8588, Japan;2. Institute for Materials Chemistry and Engineering, Kyushu University, 6-1 Kasuga-koen, Kasuga-shi, Fukuoka 816-8580, Japan;1. Beijing Key Laboratory of Heat Transfer and Energy Conservation, Beijing University of Technology, Beijing 100124, China;2. National Institute of Metrology, Beijing 102200, China;1. Multi-Disciplinary Laboratory, National University of Singapore, Singapore 117581, Singapore;2. Department of Mechanical Engineering, National University of Singapore, Singapore 117575, Singapore;3. Process & Energy Department, Delft University of Technology, The Netherlands;1. Laboratoire Energie Solaire et Economie d’Energie (LESEE), Département Génie Electrique, Energétique et Industriel, Institut International d’Ingénierie de l’Eau et de l’Environnement (2iE), 01 BP 594 Ouagadougou 01, Burkina Faso;2. Faculty of Mechanical and Process Engineering, University of Applied Science Augsburg, Postbox 110605, 86031 Augsburg, Germany;3. Institute of Sustainable and Environmental Chemistry, Faculty of Sustainability, Leuphana University Lüneburg, Scharnhorststraße 1, 21335 Lüneburg, Germany;1. Department of Mechanical Engineering, VV College of Engineering College, Tisaiyanvilai, 627657, Tamilnadu, India;2. Department of Mechanical Engineering, MEPCO Schlenk Engineering College (Autonomous), Sivakasi, India;3. Department of Mechanical Engineering, SRM University, Chennai, 600 026, Tamilnadu, India |
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| Abstract: | Silica gel/water based adsorption cycles have a distinct advantage in their ability to be driven by heat of near-ambient temperature so that waste heat below 100 °C can be recovered. One interesting feature of refrigeration cycles driven by waste heat is that they do not use primary energy as driving source. From this context, some researchers investigated the performance of multi-stage adsorption refrigeration cycles those can be operated by heat source of temperature 60 °C or lower which are usually purged to the environment, with a heat sink of temperature at 30 °C. However, the performances of multi-stage systems are low. To improve system performance, an analytic investigation on a re-heat two-stage chiller is performed to clarify the effect of thermal capacitance ratio of the adsorbent and inert material of sorption element, overall thermal conductance ratio of sorption element and evaporator along with silica gel mass on the chiller performance. Results show that cycle performance is strongly influenced by the sorption elements overall thermal conductance values due to their severe sensible heating and cooling requirements resulting from batched cycle operation. The effect of thermal capacitance ratio (Cs/Cm) becomes significant with relatively higher mass of silica gel. It is also found that the chiller performance increases significantly in the range of silica gel mass from 4 to 20 kg. |
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