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Performance evaluation of absorber in R134a/DMF based vapour absorption refrigeration system with swirl injector.

Number: pap. 2328

Author(s) : PANDA S. K., MANI A.

Summary

To improve the efficiency of vapour absorption refrigeration systems (VARS) systems, it is necessary to improve heat and mass transfer processes in absorption system components like absorber with tangential injectors which create swirling effect. Experiments were carried out on a tubular heat exchanger used as an absorber with tangential injector. In this study, a vertical absorber is considered for heat and mass transfer studies with refrigerant, R134a (1,1,1,2 –Tetrafluoroethane) and absorbent, DMF(dimethyl formamide). R134a vapour is injected into the absorber using two injectors of 4.8 mm inner diameter at an injection angle of 30° to the vertical axis and parallel to the azimuthal axis of the absorber which enhances mixing of R134a with liquid solution to increase the heat and mass transfer. Bubble absorption principle is employed in the absorber. Cold water is used as heat extraction medium from the absorber. Experimentation has been conducted with varying the operating parameters viz., liquid refrigerant flow rate from 5 lph to 15 lph, solution flow rate from 20lph to 50 lph, hot water temperature from 60 to 91°C, cooling water temperature from 5 to 20°C. Water flow rates are maintained from 80 to 200lph for hot water, from 80 to 160 lph for cooling water and 100 to 160 lph for chilled water. Absorber temperature is varies in range of range of 10 – 25°C. Mass transfer effectiveness, heat transfer effectiveness, overall heat transfer coefficient, volumetric mass transfer coefficient, absorption rate and heat rejected from the absorber have been evaluated to understand the effects of parameters viz., gas flow rate, solution initial concentration, and solution pressure and solution temperature and number of injector on absorber performance.

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Pages: 10

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Details

  • Original title: Performance evaluation of absorber in R134a/DMF based vapour absorption refrigeration system with swirl injector.
  • Record ID : 30024506
  • Languages: English
  • Source: 2018 Purdue Conferences. 17th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2018/07/09

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