Performance assessment of an evaporative cooling-assisted window air conditioner

Sawant, Aditya P.; Agrawal, Neeraj; Nanda, Pradipta Kumar

doi:10.1093/ijlct/ctr029

Cited by 20 publications

(11 citation statements)

References 5 publications

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“…It also provides an opportunity for external factors such as rats and snakes to enter through the small openings on the wall. Though, it is readily available and cheap [18,19].…”

Section: The Window-type Air Conditionermentioning

confidence: 99%

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Impact of Working Fluids and Performance of Isobutane in the Refrigeration System

Banjo¹,

Bolaji²,

Ajayi³

et al. 2022

Low-Temperature Technologies and Applications

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The effect of heat transfer medium (HTM) on the environment is associated with ozone layer depletion and global warming. The role of HTM (working fluid) in the heating and air conditioning industries is paramount, which cannot be underestimated. The conventional refrigerant has been predominantly used over decades due to their thermodynamic properties. However, hydrocarbon refrigerants such as isobutane are considered substitutes because they have negligible global warming potential and zero ozone depletion. That makes it eco-friendly among other existing refrigerants. The investigation of the refrigeration system’s performance characteristics required consideration for the coefficient of performance, refrigerating effect, and the compressor work; this enables the determination of the system’s efficiency without any assumption. Another factor that suggests a better absorption of refrigerant (working fluid) into a refrigeration system is an increase in the coefficient of performance (COP). The effect will cause a reduction in the rate of energy consumption by the compressor. The result shows that the system’s coefficient of performance when using R600a was 27.1% higher than when working with R134a, with an energy reduction of 23.3%.

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“…It also provides an opportunity for external factors such as rats and snakes to enter through the small openings on the wall. Though, it is readily available and cheap [18,19].…”

Section: The Window-type Air Conditionermentioning

confidence: 99%

“…It comes in various sizes depending on the capacity and manufacturer's design. Its limitation is that it occupies space and expensive [19,21].…”

Section: Standalone Air Conditionermentioning

confidence: 99%

Impact of Working Fluids and Performance of Isobutane in the Refrigeration System

Banjo¹,

Bolaji²,

Ajayi³

et al. 2022

Low-Temperature Technologies and Applications

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“…The use of condensate water to lower air temperature before entering the condenser to improve the AC performance has been investigated by several researchers [12][13][14]. Sawant et al [12] employed condensate water to lower the air temperature before entering to the condenser of a window air conditioner. In their experiment, they utilized condensate water on the evaporative cooling to decrease the air temperature before passing through the condenser.…”

Section: Introductionmentioning

confidence: 99%

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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“…Although vapor compression refrigeration is a highly researched topic, surprisingly very little research has been devoted to simulation and energy efficiency improvement of WACs in the open literature [8][9][10][11][12][13], while a few studies are devoted to investigating alternative refrigerants for WACs [14][15][16][17][18]. One efficiency enhancement option investigated in the literature [8,9] involved application of evaporative wet cooling media pads to the WAC condenser.…”

Section: Introductionmentioning

confidence: 99%

“…However, it had practical limitations of media pad fouling and difficulty in maintaining sufficient moisture in the pads to sustain the evaporative cooling effect. Sawant et al [11] sprayed dehumidified water on to media pads placed on both sides of a WAC and achieved energy savings. They also studied an alternative approach of using wicks of porous cloth where one end of the wick was immersed in dehumidified water and the other in the entering air flow stream to the condenser.…”

Section: Introductionmentioning

confidence: 99%

High efficiency novel window air conditioner

Bansal

2015

Applied Energy

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h i g h l i g h t sUse of novel refrigerant mixture of R32/R125 (85/15% molar conc.) to reduce global warming and improve energy efficiency. Use of novel features such as electronically commuted motor (ECM) fan motor, slinger and sub-merged sub-cooler. Energy savings of up to 0.1 Quads per year in USA and much more in Asia/Middle East where WACs are used in large numbers. Payback period of only 1.4 years of the novel efficient WAC. a b s t r a c tThis paper presents the results of an experimental and analytical evaluation of measures to raise the efficiency of window air conditioners (WAC). In order to achieve a higher energy efficiency ratio (EER), the original capacity of a baseline R410A unit was reduced by replacing the original compressor with a lower capacity but higher EER compressor, while all heat exchangers and the chassis from the original unit were retained. Subsequent major modifications included -replacing the alternating current fan motor with a brushless high efficiency electronically commutated motor (ECM) motor, replacing the capillary tube with a needle valve to better control the refrigerant flow and refrigerant set points, and replacing R410A with a 'drop-in' lower global warming potential (GWP) binary mixture of R32/R125 (85/15% molar concentration). All these modifications resulted in significant enhancement in the EER of the baseline WAC. Further, an economic analysis of the new WAC revealed an encouraging payback period.

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Performance assessment of an evaporative cooling-assisted window air conditioner

Cited by 20 publications

References 5 publications

Impact of Working Fluids and Performance of Isobutane in the Refrigeration System

Impact of Working Fluids and Performance of Isobutane in the Refrigeration System

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

High efficiency novel window air conditioner

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