A small-scale silica gel-water adsorption system for domestic air conditioning and water heating by the recovery of solar energy

doi:10.1007/s11708-019-0623-1

Front. Energy

2020, Vol. 14

Issue (2) : 328-336 https://doi.org/10.1007/s11708-019-0623-1

RESEARCH ARTICLE

A small-scale silica gel-water adsorption system for domestic air conditioning and water heating by the recovery of solar energy

Y. YU, Q. W. PAN(

), L. W. WANG

Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, Shanghai 200240, China

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Abstract

A small-scale silica gel-water adsorption system with modular adsorber, which utilizes solar energy to achieve the cogeneration of domestic air conditioning and water heating effect, is proposed and investigated in this paper. A heat recovery process between two adsorbers and a mass recovery process between two evaporators are adopted to improve the overall cooling and heating performance. First, the adsorption system is tested under different modes (different mass recovery, heat recovery, and cogeneration time) to determine the optimal operating conditions. Then, the cogeneration performance of domestic cooling and water heating effect is studied at different heat transfer fluid temperatures. The results show that the optimal time for cogeneration, mass recovery, and heat recovery are 600 s, 40 s, and 40 s, respectively. When the inlet temperature of hot water is around 85°C, the largest cooling power and heating power are 8.25 kW and 21.94 kW, respectively. Under the condition of cooling water temperature of 35°C, the obtained maximum COP_c, COP_h, and SCP of the system are 0.59, 1.39, and 184.5 W/kg, respectively.

Keywords silica gel-water heat and mass recovery solar energy domestic cooling and heating

Corresponding Author(s): Q. W. PAN

Online First Date: 07 May 2019 Issue Date: 22 June 2020

Cite this article:

Y. YU,Q. W. PAN,L. W. WANG. A small-scale silica gel-water adsorption system for domestic air conditioning and water heating by the recovery of solar energy[J]. Front. Energy, 2020, 14(2): 328-336.

URL:

https://academic.hep.com.cn/fie/EN/10.1007/s11708-019-0623-1
https://academic.hep.com.cn/fie/EN/Y2020/V14/I2/328

Fig.1 Adsorption system for residential cooling and heating applications

Fig.2 Schematic diagram of adsorption chiller

Fig.3 Photo of experimental system

Fig.4 Structure of modular adsorber

Fig.5 Variation of heating, cooling, and chilling temperature

Fig.6 Temperature profiles of chilled water at different mass recovery times

Fig.7 Effect of mass recovery time on system performance

Fig.8 Temperature difference between LOTHW and HOTCW at different heat recovery times

Tab.1 Effect of cogeneration time on system performance

Tab.2 Effect of T_{cw, in} on system performance at T_{hw, in} = 85°C

Fig.9 Effect of inlet temperature of hot water on system performance under T_{cw, in} = 30°C

Fig.10 Cogeneration performance at T_{cw, in}>35°C

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