Abstract
An innovative absorption heat pump (AHP) system is proposed to increase the temperature from waste heat to a level of 80 °C and to produce hot air over 120 °C for drying or simultaneously generating steam of 100–115 °C. Air is heated up directly by heat exchange in the absorber working in the heating mode of a LiBr/H2O AHP system. Steam is sequentially produced by heat exchange, with the absorption solution still maintaining a high temperature. An examination was carried out continuously to evaluate the performance of a bench-scale of the AHP. In the proposed AHP, the temperature of hot air at the outlet of the absorber was typically above 120 °C and, steam up to 115 °C was simultaneously generated by recovering the heat of the hot water at 80 °C. The coefficient of performance, defined by the ratio of heat generated to the power consumed for pumps of fluid flow, exceeded 20. It was also found that the fine particle slurry of LiBr crystals is formed stably in the solution under a supersaturation condition when zeolite powder is suspended. Then an almost saturated concentration is maintained as a result of the dissolution of the crystal, even if the solution is diluted by absorption of water vapor in the absorber. The theoretical analysis based on a heat and mass transfer model predicted that the output power of the AHP improved by almost 100 % compared with the conventional solution at concentrations lower than saturation solubility. Measurement of the slurry properties and an experiment on the absorption performance of the slurry were carried out, and the effectiveness of the slurry was confirmed. This chapter reviews a series of works done by the present author.
References
Florides GA, Kalogirou SA, Tassou SA, Wrobel LC (2003) Design and construction of a LiBr-water absorption machine. Energy Convers Manag 44:2483–2508
Sun DW (1997) Thermodynamic design data and optimum design maps for absorption refrigeration system. Appl Therm Eng 17:211–221
Herold KE, Radermacher R, Klein SA (1996) Adsorption chillers and heat pumps. CRC, Boca Raton
Sencan A, Yakut KA, Kalogirou SA (2000) Exergy analysis of lithium bromide/water absorption systems. Renew Energy 30:645–657
Grossman G, Childs KW (1983) Computer simulation of a lithium bromide-water absorption heat pump for temperature boosting. ASHRAE Trans 89-1:240–248
Fujii T (2010) Development activities of low temperature waste heat recovery appliances using absorption heat pumps. In: International symposium on next-generation air conditioning and refrigeration technology, Tokyo, 17–19 Feb 2010
Kawakami Y, Abe Y, Ito K, Marumo K, Aoyama T, Tanino M, Nakaso K, Nakagawa T, Itaya Y, Fukai J (2013) Development of bench-scaled adsorption type steam recovery system for generating high temperature steam from hot waste water. In: 2013 AIChE annual meeting, San Francisco, 3–8 Nov 2013
Nakaso K, Nakashima K, Tanaka Y, Iwama Y, Fukai J (2013) Study on performance of the novel steam generation system using water-zeolite pair. In: 2013 AIChE annual meeting, San Francisco, 3–8 Nov 2013
Donate M, Rodriguez L, De Lucas A, Rodriguez JF (2006) Thermodynamic evaluation of new absorbent mixtures of lithium bromide and organic salts for absorption refrigeration machines. Int J Refrig 29:30–35
Nakoryakov VE, Grigoryeva NI, Bufetov NS, Dekhtyar RA (2008) Heat and mass transfer intensification at steam absorption by surfactant additives. Int J Heat Mass Transfer 51:5175–5181
Itaya Y, Ichihashi N, Kobayashi N (2010) Effect of solution/absorbent slurry on absorption heat pump performance. Kagaku Kogaku Ronbunshu 36-5:505–511
Itaya Y, Ichihashi N, Kobayashi N, Marumo K, Masui T (2013) Enhancement of LiBr-water absorption heat pump performance by supersaturated fine crystal slurry. Kagaku Kogaku Ronbunshu 39-1:46–52
Marumo K, Kobayashi N, Itaya Y (2014) Development of lithium bromide-water absorption heat pump system for simultaneous production of heated-up air and steam from waste heat. In: Tenth international conference on heat transfer, fluid mechanics and thermodynamics (HEFAT2014), Orlando, 14–26 July 2014
Marumo K, Kobayashi N, Nakagawa T, Fukai J, Itaya Y (2016) Lithium bromide/water absorption heat pump for simultaneous production of heated air and steam from waste heat. J Chem Eng Jpn 49(3):268–273
Itaya Y, Marumo K, Masui T, Nagatani K, Takanao S, Kobayashi N (2016) Formation and vapor absorption characteristics of a LiBr crystal fine-particle slurry. J Chem Eng Japan, to be published
Acknowledgment
The author acknowledges the support of the New Energy and Industrial Technology Development Organization (NEDO) in Japan for part of this research by the Research and Development Program for Innovative Energy-Efficiency Technology.
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Itaya, Y. (2017). Thermal Energy Recovery System for Upgrading Waste Heat by an Absorption Heat Pump. In: Sayigh, A. (eds) Mediterranean Green Buildings & Renewable Energy. Springer, Cham. https://doi.org/10.1007/978-3-319-30746-6_43
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DOI: https://doi.org/10.1007/978-3-319-30746-6_43
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