Thermal design of two-stage evaporative cooler based on thermal comfort criterion

Gilani, Neda; Poshtiri, Amin Haghighi

doi:10.1007/s00231-016-1889-z

Cited by 20 publications

(17 citation statements)

References 11 publications

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“…Consequently, heat and mass transfer from the film of water into the air flow is taken into account. Following presumptions are considered for heat and mass transfer analyses . The system operates at steady state. The heat exchanging between system and the surroundings is negligible. Radiation term of heat transfer because of small difference amounts is neglected. All thermos‐physical properties are evaluated at an average temperature. The flows in the channels are in fully developed state. The water film temperature is equal to the temperature at the interface of water and air. Thermal resistance of the water film and the enthalpy of sprayed water are negligible. The air enthalpy is defined as a linear function of the wet bulb temperature. The Lewis number is taken as 1.0. The air with the uniform temperature leaves the cooler duct. …”

Section: Methodology Of Researchmentioning

confidence: 99%

“…The convective heat transfer from the water film into the air flow is given by :

{dQ}_{s} = h_{cs} f ((), T_{w} - T_{s}) italicdA

…”

Section: Methodology Of Researchmentioning

confidence: 99%

“…Following equation is derived by substituting Equation into Equation :

\frac{{italicdT}_{p}}{dx} = - U ((), T_{p} - T_{w}) italicdy / ((), m_{p} ((), C_{p} + C_{pv} ω_{f}))

…”

Section: Methodology Of Researchmentioning

confidence: 99%

“…Not only does the IDEC provide colder and drier air than that of the single‐stage one, it provides cooling demands in places with low wet bulb temperature as well. Figure shows schematic of IDEC system .…”

Section: Process Description Of Evaporative Cooling Systemsmentioning

confidence: 99%

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Effectiveness enhancement and performance evaluation of indirect‐direct evaporative cooling system for a wide variety of climates

Shirmohammadi

Gilani

2018

Env Prog and Sustain Energy

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Application of evaporative cooling systems for providing thermal comfort conditions is scrutinized. The thermal comfort criterion is mainly used for the optimum design of the air conditioning systems. ISO 7730 as thermal comfort standard is utilized to evaluate the capability and performance of above‐mentioned systems for the variety of climates in Iran. A finite difference method is used to optimize the geometric and operating parameters of evaporative cooling systems. The influences of plate spacing, air flow velocity, and wettability factor of surface are investigated on the air properties and effectiveness of systems. Effectiveness of the evaporative cooling systems increases in the case of using a narrow channel width, reducing relative humidity of air entering into secondary channel, utilizing of substances with more wettability factor of surface, and surging in the ratio of air flow velocity in secondary channel to the primary one. Among nine proposed evaporative cooling systems, co‐current direct evaporative cooler and f‐type, i.e. cross flow indirect evaporative cooler have the highest efficiency with 73% and 40%, respectively. Thus, these systems because of providing cooling demand with high efficiency are combined to make indirect/direct evaporative cooling system, employed for selecting of appropriate evaporative cooling systems in variety of climates of Iran. By generalizing the results of this research, the proper evaporative cooling system can be determined for all climates around the world. ® 2018 American Institute of Chemical Engineers Environ Prog, 38:e13032, 2019

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Section: Methodology Of Researchmentioning

confidence: 99%

“…The convective heat transfer from the water film into the air flow is given by :

{dQ}_{s} = h_{cs} f ((), T_{w} - T_{s}) italicdA

…”

Section: Methodology Of Researchmentioning

confidence: 99%

“…Following equation is derived by substituting Equation into Equation :

\frac{{italicdT}_{p}}{dx} = - U ((), T_{p} - T_{w}) italicdy / ((), m_{p} ((), C_{p} + C_{pv} ω_{f}))

…”

Section: Methodology Of Researchmentioning

confidence: 99%

Section: Process Description Of Evaporative Cooling Systemsmentioning

confidence: 99%

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Effectiveness enhancement and performance evaluation of indirect‐direct evaporative cooling system for a wide variety of climates

Shirmohammadi

Gilani

2018

Env Prog and Sustain Energy

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“…Gilani and Poshtiri [30] evaluated the performance of TSEC numerically in various simulated climatic conditions and designed a proposed guideline to assess the performance under several conditions. They recommended limits of ambient temperature and relative humidity.…”

Section: Fig 4 Schematic Diagram Of Tsecmentioning

confidence: 99%

Theoretical Analysis of Combined Compact Evaporative Cooler

Ismael

Ezzi

2018

Proceeding of 3rd Thermal and Fluids Engineering Conference (TFEC)

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An evaporative cooling system (ECS) has a number of benefits. First and foremost, it will use only a fraction of the energy of typical compressor-based cooling systems. ECS's is divided into three different types: 1) direct evaporative coolers (DECs), 2) indirect evaporative coolers (IECs), and (3) a combined system of direct and indirect evaporative coolers (DIECs). Although the DEC is simple and economical, the efficiency is low, as it cannot achieve a cooling temperature lower than wet bulb temperature. While some IECs or DIECs can achieve a higher performance, the system is complex and the initial cost is high. This paper presents a theoretical model of a combined compact evaporative cooler (CCEC), which utilizes thin film evaporation. To verify the model, the prediction has compared with experimental data, and results show that the model can be used to predict the effects of relative humidity and air flow rate based on the wet bulb effectiveness and dew point effectiveness in this CCEC system. Most importantly, it shows that this CCEC system can achieve an ultra-high cooling efficiency.

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Experimental Study on Heat and Mass Exchanger of a Dew Point Indirect Evaporative Cooler

Deepak¹,

Naik²,

Prashanth³

2021

Recent Advances in Manufacturing, Automation, Design and Energy Technologies

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Thermal design of two-stage evaporative cooler based on thermal comfort criterion

Cited by 20 publications

References 11 publications

Effectiveness enhancement and performance evaluation of indirect‐direct evaporative cooling system for a wide variety of climates

Effectiveness enhancement and performance evaluation of indirect‐direct evaporative cooling system for a wide variety of climates

Theoretical Analysis of Combined Compact Evaporative Cooler

Experimental Study on Heat and Mass Exchanger of a Dew Point Indirect Evaporative Cooler

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