Experimental Evaluation of the Heat Output/Input and Coefficient of Performance Characteristics of a Chemical Heat Pump in the Periodic Operation of CaCl<sub>2</sub> Hydration
- 1 Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi, Japan
- 2 Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi, Japan
- 3 Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi, Japan
- 4 Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi, Japan
- 5 Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi, Japan
Abstract
We herein evaluate the use of a chemical heat pump (CHP) for upgrading waste heat. CaCl 2 was used in the system of CHP. We evaluated the heat storage and heat releasing of CHP, and confirmed the practicality from the experimental results. The reactor module employed was an aluminum plate-tube heat exchanger with corrugated fins, and the CaCl 2 powder was in the form of a packed bed. Heat storage operation and heat dissipation operation are performed at the same time and supplied to the heat demand destination. At this time, an environmental heat source can be used during the heat radiation operation, and the heat output can release more heat than the heat input during heat storage. The heat discharging and charging characteristics of the reactor module were evaluated experimentally. The coefficient of performance (COP) was calculated for the heat upgrading cycle, and the heat output in the system was determined. A COP of 1.42 and output of 650 W/L, based on the heat exchanger volume, were obtained using a 600 s change time for the heat pump.
- Malik, A.S., Boyko, O., Atkar, N. and Young, W.F. (2001) A Comparative Study of MR Imaging Profile of Titanium Pedicle Screws. Acta Radiologica, 42, 291-293. https://doi.org/10.1080/028418501127346846
- Hu, T. and Desai, J.P. (2004) Soft-Tissue Material Properties under Large Deformation: Strain Rate Effect. Proceedings of the 26th Annual International Conference of the IEEE EMBS, San Francisco, 1-5 September 2004, 2758-2761.
- Ortega, R., Loria, A. and Kelly, R. (1995) A Semiglobally Stable Output Feedback PI2D Regulator for Robot Manipulators. IEEE Transactions on Automatic Control, 40, 1432-1436. https://doi.org/10.1109/9.402235
- Sun, W., Yue, X. and Wang, Y. (2017) Exergy Efficiency Analysis of ORC (Organic Rankine Cycle) and ORC-Based Combined Cycles Driven by Low-Temperature Waste Heat. Energy Conversion and Management, 135, 63-73. https://doi.org/10.1016/j.enconman.2016.12.042
- Wang, Y., Gai, L., Peng, W., Zhou, Y. and Chen, J. (2017) Maximal Continuous Power Output and Parametric Optimum Design of an Electrochemical System Driven by Low-Grade Heat. Energy Conversion and Management, 138, 156-161. https://doi.org/10.1016/j.enconman.2017.01.045
- Steward, F.R. (1984) Optimum Arrangement and Use of Heat Pumps in Recovering Waste Heat. Energy Conversion and Management, 24, 123-129. https://doi.org/10.1016/0196-8904(84)90023-2
- Sorour, M.M. (1988) Performance of a Small Sensible Heat Energy Storage Unit. Energy Conversion and Management, 28, 211-217. https://doi.org/10.1016/0196-8904(88)90024-6
- Mastronardo, E., Bonaccorsi, L., Kato, Y., Piperopoulos, E. and Milone, C. (2016) Efficiency Improvement of Heat Storage Materials for MgO/H2O/Mg(OH)2 Chemical Heat Pumps. Applied Energy, 162, 31-39. https://doi.org/10.1016/j.apenergy.2015.10.066
- Heard, C.L., Rivera, W. and Best, R. (2016) Characteristics of an Ammonia/Litium Nitrate Double Effect Heat Pump-Transformer. Applied Thermal Engineering, 99, 518-527. https://doi.org/10.1016/j.applthermaleng.2016.01.031
- Morgan, B., Wilson, S.A., Madsen, I.C., Gozukara, Y.M. and Habsud, J. (2015) Increased Thermal Stability of Nesquehonite (MgCO3 3H2O) in the Presence of Humidity and CO2, Implications for Low-Temperature CO2 Storage. International Journal of Greenhouse Gas Control, 39, 366-376. https://doi.org/10.1016/j.ijggc.2015.05.033
- Kuwata, K., Esaki, T., Yasuda, M., Matsuda, T., Kobayashi, N. and Shiren, Y. (2017) Durability of Thermochemical Heat Storage Demonstrated through Long-Term Repetitive CaCl2/H2O Reversible Reactions. Journal of Renewable and Sustainable Energy, 9, Article ID: 024102. https://doi.org/10.1063/1.4978351