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Effect of operational parameters on heat and mass transfer in generator of R134a-DMF absorption refrigeration system.

Number: pap. 2152

Author(s) : PASUPATHY B., ANNAMALAI M.

Summary

Vapour absorption refrigeration systems (VARS) has regained the attention due to their potential for renewable/waste heat utilization. To improve the efficiency of these systems, it becomes obligatory to make component level studies on processes. In this present study, investigations on the heat and mass transfer in compact generator of the vapour absorption refrigeration system have been carried out using R134a-Dimethyl formamide (DMF). An experimental facility of VARS has been fabricated using brazed plate heat exchangers as generator, condenser, absorber, evaporator and solution heat exchanger. Hot water source is used to supply hot water between 80 °C and 98 °C to suit utilization of solar energy, waste heat, etc to the generator. Cooling water from cooling water source is circulated through the absorber and condenser to remove the heat. Water from cooling load simulator is circulated to the evaporator. Investigations have been carried out on VARS with a rated cooling capacity of 1kW by varying the operating parameters viz, solution flow rate from 0.02 m3hr-1 to 0.05 m3hr-1, liquid refrigerant flow rate from 0.002 m3hr-1 to 0.015 m3hr-1, hot water temperature from 85 °C to 97 °C. Generator pressure is varied from 620 kPa to 920 kPa, hot water flow rate from 0.12 m3hr-1 to 0.32 m3hr-1 and solution initial concentration is varied from 0.59 kgkg-1 to 0.75 kgkg-1. The effect of solution flow rate, generator temperature and generator pressure on the performance of generator and the absorption system has been investigated. Heat and mass transfer coefficients, heat transfer rate, mass desorption rate increase with generator temperature and solution flow rate but decrease with increase in generator pressure.

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Pages: 10 p.

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Details

  • Original title: Effect of operational parameters on heat and mass transfer in generator of R134a-DMF absorption refrigeration system.
  • Record ID : 30006455
  • Languages: English
  • Source: 2012 Purdue Conferences. 14th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2012/07/16

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