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3 results on '"Jingde Jiang"'

1. Thermodynamic Analysis of an Innovative Cold Energy Storage System for Auto-Cascade Refrigeration Applications

Author

Zhenzhen Liu, Jingde Jiang, Zilong Wang, and Hua Zhang

Subjects
zeotropic mixture, modified auto-cascade refrigeration, thermodynamic performance, Technology
Abstract

The cooling capacity needed by ultra-low temperature apparatus cannot be reached economically with a single vapor compression refrigeration cycle due to the constraint of the high compressor pressure ratio. The auto-cascade refrigeration cycle is a good alternative. In this work, a novel concept that applies the principle of the auto-cascade refrigeration cycle to store cold energy is conducted. The environment-friendly refrigerants of R600a/R290/R170 zeotropic mixtures are used to study the performance of the modified auto-cascade refrigeration cycle (MACRC) as an alternative for cold-energy applications. The simulation results show that a cooling capacity of 500 W can be provided below −60 °C. The mixture with a mass fraction of 0.25/0.35/0.40 yields a COP of 0.695 and an exergy efficiency of 0.262 at −66 °C. The performance of the MACRC system was investigated at an ambient temperature of 20 to 40 °C for indoor small-scale applications. It is concluded that the performance would be improved by decreasing the ambient temperature. The results of the work should be helpful for the design and optimization of auto-cascade systems.

Published
2023
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3. Experimental investigation on a novel cold storage defrosting device based on electric heater and reverse cycle

Author

Jingde Jiang, Zunli Kou, Dong Wang, Leren Tao, and Lifang Yao

Subjects
Engineering, business.industry, 020209 energy, Energy Engineering and Power Technology, Cold storage, 02 engineering and technology, Thermal load, Cooling capacity, Industrial and Manufacturing Engineering, 020401 chemical engineering, Defrosting, Frost, 0202 electrical engineering, electronic engineering, information engineering, 0204 chemical engineering, Process engineering, business, Operational stability, Gas compressor, Simulation, Evaporator
Abstract

It is universally acknowledged that the accumulation of frost on the evaporator surface will reduce the cooling capacity and performance of the cold storage. Therefore defrosting must be periodically and effectively carried out to avoid the evaporator blockage. The electric heater defrosting (EHD) and reversed cycle defrosting (RCD) methods are usually used in cold storages. However, no matter what method is adopted, there will be extra thermal load distributed to the compartments which lead to an unfavorable storage temperature fluctuation and then cause quality loss of the stored food. In order to solve the above-mentioned problems, a novel cold storage defrosting device based on EHD and RCD was proposed in this paper. Experiment was performed on the device to investigate its effect on several aspects including energy saving, reduction of cold storage temperature fluctuation and improvement of compressor operational stability etc. The results showed that this novel device could remarkably increase energy utilization and reduce temperature fluctuation of the cold storage, which was beneficial for long-term storage of products in the cold storage. Moreover, it was able to increase the operational stability of the compressor.

Published
2017
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