Theoretical and experimental analyses of mist precooling for an air-cooled chiller

Yu, F.W.; Ho, W.T.; Chan, K.T.; Sit, R.K.Y.

doi:10.1016/j.applthermaleng.2017.11.046

Cited by 11 publications

(6 citation statements)

References 18 publications

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“…Nozel tunggal yang menyemprotkan kabut dengan berukuran 41 -45 mikron dapat memberikan pendinginan yang tidak basah atau hampir tidak basah di udara diam di ruang semi-tertutup (Farnham C et al, 2011). Pendingin memiliki kapasitas 282 kW dan COP 2,8 pada beban 100% (Yu FW et al , 2018).…”

Section: Pendahuluanunclassified

Rancang Bangun Penangkap Embun Untuk Meningkatkan Efisiensi Aplikasi Pengabut Air Sebagai Model Mitigasi Urban Heat Island Masa Depan

Luis

Wolo²,

Damopolii³

2022

jstl

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This research was conducted to develop a dew-catching vehicle that will be used to support the application of a water misting system. The dew catcher design is expected to overcome the problem of too large a mist grain diameter in low-pressure water misting applications. The study was conducted using a 110 psi pressure pump and ten nozzles measuring 0.3 mm that sprayed mist from a height of 2 M. In this study, and the dew catcher design used can overcome the disturbance of water droplets due to the production of too large mist grains at low pressure misting. The maximum temperature drop that can be achieved is 7.6°C.

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Section: Pendahuluanunclassified

Rancang Bangun Penangkap Embun Untuk Meningkatkan Efisiensi Aplikasi Pengabut Air Sebagai Model Mitigasi Urban Heat Island Masa Depan

Luis

Wolo²,

Damopolii³

2022

jstl

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“…In dry weather conditions, where the primary air humidity is very low, it could be humidified and further cooled down by direct EC if a water shower was added to the cellulose pad, which increases the moisture content of the supply air. The ambient secondary flow at state (5) is pre-conditioned by mist injection, where its temperature is decreased, and relative humidity is increased at state (6). An additional decrease in the secondary air temperature, at state 7, can be achieved when the secondary air flows through the wet channels of the heat exchanger, where nozzles spray a water shower.…”

Section: Experimental Rigmentioning

confidence: 99%

“…In arid climatic conditions, EC has the added benefit of increasing the moisture content of the supply air stream. In hot arid climates, it is feasible to utilize EC, which can be implemented by employing various modes of operation such as mist injection [6], water spray [7], or the combination of mist injection and water spray [8].…”

Section: Introductionmentioning

confidence: 99%

Experimental Analysis of Mist Injection and Water Shower Indirect Evaporative Cooling in Harsh Climate

Horr¹,

Tashtoush²,

Chilengwe³

2020

IJHT

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An experimental investigation of the performance of a direct-indirect evaporative cooling fresh air handling unit with different modes of operation is presented. Linear regression analysis is used to fit the experimental results, and the correlation coefficient is evaluated. It is found that the highest temperature reduction of 18.8℃ is achieved across the heat exchanger for the tested unit when the water shower mode is implemented at an ambient dry-bulb temperature of 44℃ in conditions of relative humidity less than 20%. In the water shower and the combined mist injection and water shower modes of operation, the temperature reduction across the heat exchanger generally reduces, with increasing relative humidity. Furthermore, the results showed that water consumption increased with increasing ambient dry-bulb temperature and decreased with increasing ambient relative humidity. Finally, the lowest energy consumption of 1.64 kWh occurred with the water shower mode operated at peak dry-bulb temperature design condition. The energy consumptions for the mist injection mode of operation were 1.89 kWh and 2.15 kWh for the peak dry-bulb temperature and peak wet-bulb temperature design conditions, respectively. At these design conditions, the energy consumptions of the combined mist injection and water shower mode of operation are 2.7 kWh and 2.83 kWh, respectively.

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“…Substituting . m air from Equation (11) in Equation (6) gives the final form for the NTU: (12) where α and n are empirical constants specific to the pad.…”

Section: Mathematical Modelsmentioning

confidence: 99%

Energy and Economics Analyses of Condenser Evaporative Precooling for Various Climates, Buildings and Refrigerants

Shen¹,

Im²,

Ally³

2019

Energies

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Condenser evaporative pre-coolers provide a low cost retrofit option for existing packaged rooftop air conditioning application units. This paper aimed to provide a comprehensive study to assess energy savings and peak power reductions of condenser evaporative cooling. Condenser evaporative cooling leads to a lower temperature of the air entering the condenser of a rooftop unit, which results in smaller compressor power consumption. Using EnergyPlus building energy simulations, we mapped the impacts on energy savings and energy reductions at peak ambient temperatures in three building types and 16 locations with levels of pad effectiveness and demonstrated the effects on air conditioner using either R22 or R410A as refrigerants. Economics and control strategy to maximize the cost saving were also investigated. The results demonstrate that energy savings are much greater for HVAC systems with the refrigerant R410A than they are with R22, and evaporative pre-cooling provides the opportunity for annual energy savings and peak demand reductions, with significant potential in hot, dry climates. Additionally, we validated an improved mathematical model for estimating the condenser pre-cooling wet bulb efficiency which shows clear advantage over the current EnergyPlus model.

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Theoretical and experimental analyses of mist precooling for an air-cooled chiller

Cited by 11 publications

References 18 publications

Rancang Bangun Penangkap Embun Untuk Meningkatkan Efisiensi Aplikasi Pengabut Air Sebagai Model Mitigasi Urban Heat Island Masa Depan

Rancang Bangun Penangkap Embun Untuk Meningkatkan Efisiensi Aplikasi Pengabut Air Sebagai Model Mitigasi Urban Heat Island Masa Depan

Experimental Analysis of Mist Injection and Water Shower Indirect Evaporative Cooling in Harsh Climate

Energy and Economics Analyses of Condenser Evaporative Precooling for Various Climates, Buildings and Refrigerants

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