Investigation of the Effect of Operating Sequences and Conditions on the Cooling Performance of Adsorption Cooling System

doi:10.3901/JME.2021.08.255

Abstract

Abstract: Because of the global warming and energy shortage, new energy cooling technologies have received more and more attention. In order to verify the potential of the adsorption cooling technology in the real application and the feasibility of the electrostatic coating method in an adsorption cooling system, a double-bed adsorption chiller was built. In this chiller, silica gel was used as the adsorbent, and the coated adsorbent beds were prepared with the electrostatic coating method. A novel heat and mass recovery phase was developed. In order to investigate its effect on the performance, various operating sequences were designed and tested. It was found that this novel operating sequence had a better performance than the basic operating sequence, which showed an improvement of 113.7%. Various operating conditions for example, adsorption/desorption phase time, mass recovery time, heat recovery phase time, cooling water inlet temperature, and hot water inlet temperature, were investigated and optimized with the control variate method. It was found that the operating conditions had significant influence on the system performance. The coefficient of performance (COP) is recorded at about 0.25, while the specific cooling power (SCP) is about 180.4 W/kg under the operating condition of about 25 ℃ cooling water inlet temperature, 90 ℃ hot water inlet temperature, 16 ℃ chilled water inlet temperature, 660 s of adsorption/desorption phase time, 85 s of mass recovery time, 50 s of heat recovery time, 2 kg/min chilled water flow rate, and 8 kg/min hot water and cooling water flow rate. According to the experimental results, it was found that the adsorption chiller and the coated adsorbent bed had a positive impact on the energy-saving and a great potential on the real application.

Key words: adsorption chiller, operating sequence, operating condition, electrostatic coating, system performance

CLC Number:

TB657

ZHU Longqian, WU Chili, HE Wei, LUO Senwen, HU Hanying. Investigation of the Effect of Operating Sequences and Conditions on the Cooling Performance of Adsorption Cooling System[J]. Journal of Mechanical Engineering, 2021, 57(8): 255-264.

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