Performance evaluation and comparison of multistage indirect evaporative cooling systems in two operation modes

Cui, Xin; Yang, Xiaohu; Kong, Qiongxiang; Meng, Xiangzhao; Jin, Liwen

doi:10.1002/er.4803

Cited by 6 publications

(3 citation statements)

References 50 publications

(51 reference statements)

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“…To improve the simple IEC, Maisotsenko proposed a new flow arrangement for IEC, termed as Maisotsenko-cycle (M-cycle) IEC. This concept made a great contribution to the IEC development [33][34][35]. M-cycle IEC theoretically could decrease the minimum temperature from DEC's wet-bulb temperature down to the dew temperature of the intake air while avoiding the addition of moisture into the supply air [36][37][38].…”

Section: Indirect Evaporative Cooling (Iec)mentioning

confidence: 99%

Evaporative Cooling Integrated with Solid Desiccant Systems: A Review

et al. 2021

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Evaporative cooling technology (ECT) has been deemed as an alternative to the conventional vapor-compression air conditioning system for dry climates in recent years due to its simple structure and low operating cost. Generally speaking, the ECT includes two types of different technologies, direct evaporative cooling (DEC) and indirect evaporative cooling (IEC). Both technologies can theoretically reduce the air temperature to the wet-bulb temperature of outdoor air. The major difference between these two technologies is that DEC will introduce extra moisture to the supply air while IEC will not. The enhanced IEC, Maisotsenko-cycle (M-cyle) IEC, can even bring down the air temperature to the dew point temperature. The ECT integrated with solid desiccant systems, i.e., solid desiccant-assisted evaporative cooling technologies (SDECT), could make the technology applicable to a wider range of weather conditions, e.g., weather with high humidity. In this paper, the recent development of various evaporative cooling technologies (ECT), solid desiccant material and the integration of these two technologies, the SDECT, were thoroughly reviewed with respect to their configuration, optimization and desiccant unit improvement. Furthermore, modeling techniques for simulating SDECT with their pros and cons were also reviewed. Potential opportunities and research recommendations were indicated, which include improving the structure and material of M-cycle IEC, developing novel desiccant material and optimizing configuration, water consumption rate and operation strategy of SDECT system. This review paper indicated that the SDECT system could be a potential replacement for the conventional vapor-compressed cooling system and could be applied in hot and humid environments with proper arrangements.

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Section: Indirect Evaporative Cooling (Iec)mentioning

confidence: 99%

Evaporative Cooling Integrated with Solid Desiccant Systems: A Review

et al. 2021

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“…The indirect evaporation cooler was already given a mathematical basis (IEC). Following validation, the mathematical model had been utilized to examine the assessment criteria while simultaneously considering the effects of the cooling capacity, pressure drop, and multi-stages IEC functioning in two modes [10]. The Mode-2 IEC has a regenerative M-cycle system, whereas the Mode-1 IEC is a typical counter flow device.…”

Section: Introductionmentioning

confidence: 99%

Efficiency Analysis of a Two-Stage Evaporative Cooling System with Sustainable Water Pad

Salman,

Jasim,

Aljuboori

et al. 2024

IJHT

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The efficiency of evaporative media typically ranges from 80% to 90%. The most effective systems can reduce the temperature of dry air to 95% of the wet-bulb temperature, while the least effective systems can only accomplish 50%. The rate of evaporation efficiency experiences little decline over time. The climate in Iraq has a more extended period of summer in comparison to other nations. The ambient temperature during this season exceeds 50 o C, making the evaporative cooling system appropriate for this region. The evaporative cooler in this study is created by incorporating multiple heat exchanger stages (water-air) to cool the input air indirectly and indirectly before cooling directly inside the traditional evaporative cooler. When compared to compression refrigeration systems, the multistage evaporative cooler helps to reduce energy use, environmental pollution, the effects of global warming, and manufacturing costs. The multistage evaporative cooler is appropriate for use in homes and sizable structures with high relative humidity and temperatures. The developed evaporative cooler's experimental findings demonstrated that the addition of a cooling stage to a conventional cooler reduces the out-dry bulb temperature by about 50% and the specific humidity by about 80%.

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“…Pakari et al 13 compared one-dimensional and three-dimensional models of REC with the experimental result and concluded that the one-dimensional model is adequate enough to predict the performance. Cui et al 14 simulated multistage evaporative cooler and found some trade-off between performance and fan power. Wang et al 15 conducted a combined energy–exergy analysis of IEC and optimized for thermal performance.…”

Section: Introductionmentioning

confidence: 99%

Energy, exergy and economic assessments of the dual-mode evaporative cooler for various international climate zones

Kashyap

Sarkar

Kumar

2021

Building Services Engineering Research and Technology

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The conventional desert cooler is effective for dry seasons and the regenerative evaporative cooler (REC) is an effective device for humid seasons in composite climate zones. Hence, the dual-mode evaporative cooler (a two-in-one device) is an intelligent choice for air conditioning, which can operate in both direct and regenerative modes depending on the seasonal climatic condition. The exergy and economic analyses of this novel device for global climatic conditions are performed to check the suitability in different regions of the world. An experimental prototype of a dual-mode evaporative cooler is developed and tested to validate the simulation model. The effectiveness, coefficient of performance, exergy destruction, exergy efficiency, operating cost, and specific total cost (STC) are evaluated for both (direct and regenerative) modes of operation. The annual and month-wise performances of dual-mode evaporative cooler have been assessed for five cities of international climate zones. The operating cost of both modes is compared by considering electricity charges in different countries. The dual-mode device is compared with the single-mode device as well. The specific cost is similar for both modes in most of the ASHRAE climatic zones. The present study reveals that significant energy and cost savings are possible by using the dual-mode evaporative cooler. Practical application: This article considers the application of a dual-mode evaporative cooler (direct as well as regenerative mode) in different climate zones and, through investigating the exergy and economic performances, allows designers and operators to understand the potential benefits of employing various operating modes in particular climates.

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Performance evaluation and comparison of multistage indirect evaporative cooling systems in two operation modes

Cited by 6 publications

References 50 publications

Evaporative Cooling Integrated with Solid Desiccant Systems: A Review

Evaporative Cooling Integrated with Solid Desiccant Systems: A Review

Efficiency Analysis of a Two-Stage Evaporative Cooling System with Sustainable Water Pad

Energy, exergy and economic assessments of the dual-mode evaporative cooler for various international climate zones

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