Improved energy performance of a refrigerating machine using water spray upstream of the condenser

Tissot, Julien; Boulet, Pascal; Trinquet, F.; Fournaison, Laurence; Lejeune, Martine; Liaudet, F.

doi:10.1016/j.ijrefrig.2013.08.025

Cited by 40 publications

(12 citation statements)

References 10 publications

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“…(8), the COP improvement is 16.4%. This results is slightly higher than the experimental result Britto and Vasanthanathan [16], that is 14.3%. But, compared to investigation by Ibrahim et al (2017), this experimental result is lower.…”

Section: Resultscontrasting

confidence: 65%

Experimental investigation on the performance of residential air conditioning system using water condensate for subcooling

2018

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The experimental investigation of subcooling effects on system COP was carried out on a residential air conditioning using R410A as working fluid, with a compressor capacity of about 0.75 kW. In the experiment, the indoor and outdoor temperatures were controlled at 24°C and 32°C. The results showed that the use of condensate water lowers the refrigerant temperature in the condenser outlet by 2.7°C. By lowering the refrigerant temperature, the cooling capacity of the air conditioning can be enhanced. The decrease in of refrigerant temperature results in COP improvement 16.4%. Besides increasing the COP, the condensate water also decreases the discharge compressor temperature by 7.6°C. The decrease in of the discharge compressor temperature resulted in the decrease in power consumption of the air conditioning system by 5.9%.

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Section: Resultscontrasting

confidence: 65%

Experimental investigation on the performance of residential air conditioning system using water condensate for subcooling

2018

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“…There was a 14.1% reduction of the overall electricity consumption of a chiller system operating with a mist system and optimum control of condensing temperature under a subtropical climate. Tissot et al (2014) examined how different mist generation rates influenced the COP of an air conditioner at different combinations of dry bulb temperatures and relative humidity. A higher mist generation rate with lower relative humidity brought a greater improvement in the refrigeration effect and hence the COP.…”

Section: Advances In Building Energymentioning

confidence: 99%

“…Yu et al in order to develop an optimum strategy for designing nozzle layout and size for different configurations of the condensers. Some issues had been addressed by Tissot et al (2014) and Tissot, Boulet, Trinquet, Fournaison, and Macchi-Tejeda (2011) on their numerical analysis on air cooling by evaporating droplets in the upward flow of a condenser. The size of mist droplets affected the cooling effect in a complex manner.…”

Section: Opportunities and Challenges Of Mist Precooling Of Condensermentioning

confidence: 99%

Evaporative cooling technologies for air-cooled chillers for building energy performance improvement

Chan

Yang

et al. 2015

Advances in Building Energy Research

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Where water conservation is concerned, central air-conditioning systems in commercial buildings are installed with air-cooled chillers for comfort cooling. This study examines evaporative cooling technologies for air-cooled chillers to improve their energy performance. Two common devices for cooling air intake to condensers are evaporative coolers and mist generators. Depending on weather conditions and packing materials, evaporative coolers can enhance the refrigeration effect and chiller energy performance at various degrees. Yet, different configurations and designs for air-cooled condensers call for tailor-made design of the coolers. The coolers also impose additional flow resistance to condenser air and, in turn, additional fan power. Mist generated in front of the condensers brings no flow resistance to condenser air and allows the dry bulb temperature approach closely the corresponding wet bulb temperature. The cooling effectiveness can be maximized with lesser water consumption. The benefit of evaporative cooling for air-cooled chillers is more appealing in future climate scenarios in a subtropical climate, considering the higher difference between the dry bulb and wet bulb temperatures. Integration of control and optimization strategies with mist precooling has been discussed.

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“…Tissot et al [15] investigated the improvement on the heat transfer obtained by spraying water on the tube surface of an air condenser. They noticed that the COP could be improved up to 29 % under defined conditions.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigations on air side heat and mass transfer phenomena in evaporative condensers

Fiorentino¹,

Starace²

2017

IJHT

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The evaporative cooling is an energy saving technology and for this reason is widely used both in industrial and civil fields. The heat and mass transfer phenomena occurring inside their tube banks are hard to study and even if many researchers have faced them, further activities need to be carried out. For this reason, this work aims at investigating with an experimental approach the evaporative condensers performance at the tube scale, focusing on the air side where more complex physical interactions occur. A test rig has been set up made of a rectangular transparent channel where electrical heaters simulate the refrigerant side and embedded Pt100 Resistance Temperature Detectors controlled by a PID set and keep constant a given outer surface temperature. Water and air operating conditions are controlled as well, and this allows to carry out a sensitivity analysis depending on all the parameters influencing those thermo-fluid dynamic phenomena. The results show that the cooling rate decreases with the air relative humidity and dry bulb temperature, while increases with water flow rate and temperature. For the testing cases the maximum improvements deriving from increasing water flow rate and temperature are of 37 % and 14 % respectively.

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Improved energy performance of a refrigerating machine using water spray upstream of the condenser

Cited by 40 publications

References 10 publications

Experimental investigation on the performance of residential air conditioning system using water condensate for subcooling

Experimental investigation on the performance of residential air conditioning system using water condensate for subcooling

Evaporative cooling technologies for air-cooled chillers for building energy performance improvement

Experimental investigations on air side heat and mass transfer phenomena in evaporative condensers

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