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Hybrid air conditioning system.

Number: pap. n. 112

Author(s) : RANE M. V., HUNDIWALE A. S.

Summary

A 1.5 TR nominal capacity compressor is used to integrate a Hybrid Air Conditioning System, HACS in the Heat Pump Laboratory IIT Bombay, HPL_IITB. This system uses patented diabatic contacting devices with rotating disk assemblies to enable effective heat and mass transfer between Liquid Desiccant, LD, and air. Indoor air is cooled and dehumidified in single step to the required dry bulb temperature and relative humidity. Evaporator of vapour compression system integrated within the indoor diabatic contacting device helps remove the heat of absorption of moisture along with sensible cooling of indoor air. Dilute LD exiting the indoor diabatic contacting device is preheated in a solution heat exchanger before it is introduced into the outdoor diabatic contacting device, where it is regenerated using the condenser heat. Moisture from the LD is rejected into the outdoor air in the outdoor contacting device. As the LD is capable of dehumidifying the indoor air at the temperature significantly higher than the dew point temperature of the indoor air, the refrigerant evaporation temperature can be significantly higher than that in the conventional vapour compression based air conditioners. Also as the condenser heat is rejected in the outdoor diabatic contacting device while regenerating the LD, the refrigerant condensing temperatures are lower than those typical in air-cooled air conditioners. Combined effect of higher evaporating temperature and lower condensing temperature can result in substantial increase in cooling capacity and COP for a given compressor. This paper presents the details of three stage diabatic contacting devices, with advantages like no LD carryover in the air streams, very low pressure drop across the diabatic contacting devices, compact system based on high surface density rotating contacting media, low parasitic power for the rotor and the blowers. Experimental results of a 1.5 TR HACS will be presented to prove the techno economic benefits of such a system to meet the requirement of comfort air conditioning.

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Pages: 10 p.

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Details

  • Original title: Hybrid air conditioning system.
  • Record ID : 30013735
  • Languages: English
  • Source: International sorption heat pump conference (ISHPC2014), College Park, United States, March 31-April 2, 2014.
  • Publication date: 2014/03/02

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