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Study on gradient thermal driven adsorption cycle with freezing and cooling output for food storage.

Author(s) : SONG F. P., GONG L. X., WANG L. W., et al.

Type of article: Article

Summary

An gradient thermal driven adsorption cycle powered by low grade heat, such as geothermal, solar energy, or waste heat from factories, is constructed for the food storage both under the conditions of freezing (around -15°C) and the refrigeration (around 5°C). The cycle is combined by the CaCl2-BaCl2 adsorption freezer (first stage) and silica-gel/lithium chloride adsorption air conditioner (second stage) and it is driven by the heat source with gradient temperature that is lower than 100°C.The cycle produces cooling and freezing power simultaneously with the implementations of adsorption and resorption processes. In the experiments the heat source temperature ranges from 70 to 90°C, condensing temperature is controlled at 25°C. The results show that thermal coefficient of performance (thermal COP) of gradient thermal driven cycle ranges from 0.13 to 0.28, which improves 87% compared with the adsorption freezing cycle under the heat source of 90°C and evaporating temperature of -15°C. The refrigerating capacity is 4.56 kW under driving heat source at 70°C and the improvement is 76.5% if the heat source temperature increases to 90°C. The exergy efficiency of the cycle are calculated to be 0.11-0.13 under the above conditions, and the exergy efficiency for heat utilization varies from 0.31 to 0.42, which is improved 90.3% and 75.6% compared with the adsorption freezing cycle and adsorption cooling
cycle, respectively when the heat source temperature is 90°C.

Details

  • Original title: Study on gradient thermal driven adsorption cycle with freezing and cooling output for food storage.
  • Record ID : 30012289
  • Languages: English
  • Source: Applied Thermal Engineering - vol. 70 - n. 1
  • Publication date: 2014/09
  • DOI: http://dx.doi.org/10.1016/j.applthermaleng.2014.04.066

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