Numerical investigation of transfer coefficients of an evaporatively-cooled condenser

Jahangeer, K.A.; Tay, A.A.O.; Islam, M.R.

doi:10.1016/j.applthermaleng.2011.02.007

Cited by 66 publications

(29 citation statements)

References 9 publications

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“…Under most driving conditions, only the more conventional finned air cooling would be used to remove the required engine heat. Evaporative cooling mechanisms including liquid films, liquid drops, and sprays have been studied for various applications [1,2,3,4]. Any of these types of evaporative cooling could be used in the hybrid radiator-cooling system.…”

Section: Introductionmentioning

confidence: 99%

Efficient, Active Radiator-Cooling System

Smith

2013

SAE Int. J. Commer. Veh.

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A new concept for an efficient radiator-cooling system is presented for reducing the size or increasing the cooling capacity of vehicle coolant radiators. Under certain conditions, the system employs active evaporative cooling in addition to conventional finned air cooling. In this regard, it is a hybrid radiator-cooling system comprised of the combination of conventional air-side finned surface cooling and active evaporative water cooling. The air-side finned surface is sized to transfer required heat under all driving conditions except for the most severe. In the later case, evaporative cooling is used in addition to the conventional air-side finned surface cooling. Together the two systems transfer the required heat under all driving conditions. However, under most driving conditions, only the air-side finned surface cooling is required. Consequently, the finned surface may be smaller than in conventional radiators that utilize air-side finned surface cooling exclusively. Results of this study include details of the hybrid system as well as radiator size and evaporative cooling loads at various evaporation rates. It is shown that a hybrid radiator with a 76-L/hr (20-gal/hr) water flow rate can transfer up to 19% more heat than a conventional radiator with the same finned area, or alternately, it can transfer heat at the same rate with a radiator size of 21% less than that of a conventional radiator.

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Section: Introductionmentioning

confidence: 99%

Efficient, Active Radiator-Cooling System

Smith

2013

SAE Int. J. Commer. Veh.

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“…The micro-measurement results show that the change of the liquid film thickness value with the circumferential angular position is mainly caused by the force component of gravity; the effect of Reynolds number on the liquid film thickness is very large, and when Re is greater than 2,000, the droplet will continuously fall or even occur sputtering. Fiorentino and Starace [7] and Jahangeer et al [8] numerically studied the falling film flow characteristics under consideration of the upward blowing of the bottom of the horizontal tube. In addition, they also carried out a more comprehensive simulation of liquid spray density, air flow rate and tube row mode.…”

Section: Introductionmentioning

confidence: 99%

Study on liquid film thickness and flow characteristics of falling film outside an elliptical tube

Zhang¹,

Zhu²,

Q³

2019

Desalination and Water Treatment

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A three-dimensional model is applied to simulate the spreading process and thickness distribution of the liquid film outside an elliptical horizontal tube falling-film heat exchanger. Reynolds number (Re) is 187 and the counter-current air flow rates are 0, 0.1 and 0.5 m/s, respectively. The volume of fluid method is used to trace the gas-liquid interface. It is shown that falling film flow delays and the liquid film thickness increases as the gas flow rate increases. When the counter-current gas flow rate is increased to 0.5 m/s, the falling film distribution becomes uneven and local accumulation occurs. Along the circumferential direction, the liquid film velocity increases as the gas flow rate increases.

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“…The increase in living standards and demand for human comfort has led to an increase in energy consumption. The amount of energy consumed by air conditioners, refrigerators, and water heaters is increasing rapidly, and occupies about 30% of total power consumption [3]. Electricity consumption for air conditioning systems has been estimated at about 45% for residential and commercial buildings [4].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study to Performance Improvement of Vapor Compression Cooling System Integrated Direct Evaporative Cooler and Condenser

Rachman

Nesti

2018

MATEC Web Conf.

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For areas with very hot and humid weather condition increased latent and sensible load are a major problem in cooling systems that will increase compressor work so that electricity consumption will also increase. Combined condenser with direct evaporate cooling will increase the heat removal process by using an evaporative cooler effect that will increase the efficiency of energy use. This paper presents the study of the use of evaporator cooling and condenser. This paper mainly calculated energy consumption in steam compression cooling systems and related problems. From the results of this study, the use of condensers with evaporative cooling, power consumption can be reduced to 46% and performance coefficient (COP) can be increased by about 12%, with 1,2 kW cooling capacity.

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Numerical investigation of transfer coefficients of an evaporatively-cooled condenser

Cited by 66 publications

References 9 publications

Efficient, Active Radiator-Cooling System

Efficient, Active Radiator-Cooling System

Study on liquid film thickness and flow characteristics of falling film outside an elliptical tube

Experimental Study to Performance Improvement of Vapor Compression Cooling System Integrated Direct Evaporative Cooler and Condenser

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