Numerical study on performance of a desiccant cooling system with indirect evaporative cooler

Gao, Wenliang; Worek, William M.; Konduru, Vinaykumar; Adensin, Keith

doi:10.1016/j.enbuild.2014.09.049

Cited by 56 publications

(18 citation statements)

References 14 publications

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“…It is the reason why these devices are treated as an environmental friendly solution for cooling energy production. Individual devices based on the M-Cycle technology are implemented for systems which operate especially in hot and dry area for now [3]. In humid and moderate climatic conditions there is a necessity to control the humidity level of the supply airflow.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the multi-stage desiccant cooling system performance in Wrocław (Poland)

et al. 2019

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In this study, the application potential of desiccant cooling system with indirect evaporative precooling is analyzed for moderate climatic conditions. Wrocław (Poland) was selected as a representative city. On the base of summer season weather parameters different system running modes were proposed such as cooling and dehumidification mode (Mode 1) and only cooling mode (Mode 2). The average month Thermal and Electrical COP were established for selected climatic conditions. It was concluded that proposed system allows to cool the air without occurrence of condensation in Mode 2 with high average monthly electrical COP (COPel = 62.2 in August). On the other hand when dehumidification is needed, system operates in Mode 1 and obtains relatively high average Thermal COP values (COPth = 2.2).

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Section: Introductionmentioning

confidence: 99%

Analysis of the multi-stage desiccant cooling system performance in Wrocław (Poland)

et al. 2019

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“…A mathematical model was developed based on the coupled heat and mass transfer to assess the performance of the hybrid system in terms of air rate per unit cooling capacity and coefficient of performance. The impacts of the operation factors and transfer units on the performance of both heat exchanger and indirect evaporative cooler were numerically examined . A method for meaningfully enhancing the operating efficiency of IEC systems was investigated.…”

Section: Introductionmentioning

confidence: 99%

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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“…Additionally, the developed mathematical model was used in a two-stage indirect and direct evaporative cooling unit which showed 50% higher wet-bulb effectiveness, and a counter-flow regenerative evaporative cooling unit showed 60% higher wet-bulb effectiveness, when compared to a one-stage indirect evaporative cooling unit. Gao et al 11 also developed a mathematical model to assess the performance of a solid desiccant indirect evaporative cooling hybrid system with respect to the coefficient of performance and efficiency. They investigated the effects of operating parameters and number of transfer units (NTU) on the performance of the hybrid system, and the results showed that the optimum inlet air temperature and humidity ratio required should be less than 35 C and 18 g/ kg, respectively.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of an ultrasonic regenerative evaporative cooler for a desiccant cooling system

Arun

Mariappan

2018

Building Services Engineering Research and Technology

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This paper presents fabrication of an ultrasonic regenerative evaporative cooler, coupled with a desiccant dehumidifier. Ultrasonic regenerative evaporative cooler consists of several sets of a dry channel and a wet channel. A part of the air from the dry channel is redirected into the wet channel where it is cooled by evaporation of water mist from an ultrasonic atomiser. Air flowing through dry channels is pre-cooled by heat transfer between wet and dry channels, without changing its humidity. In this cooler, the conventional hygroscopic layer for wetting the plate surface is replaced with the water mist. It is observed that the performance of the cooling system significantly depends on the channel spacing, channel length, inlet airflow rate and extraction ratio, and marginally depends upon feed water temperature. The room cooling capacity is eminently responsive to both air mass flow rate and extraction ratio. The maximum available room cooling capacity of 339.8 W is obtained for the optimal values of 0.0488 kg/s mass flow rate of air and 0.37 extraction ratio. The prototype achieved wet-bulb effectiveness values as high as 1.15 and delivered more than 10 C temperature drop. Practical application: An ultrasonic regenerative evaporative cooler can be coupled with a desiccant dehumidification unit for use in hot and humid climate to achieve comfort condition utilising less energy and feed water when compared to the vapour compression refrigeration system. From this prototype researchers and engineers can develop, by combining desiccant regenerators and evaporative coolers which use ultrasonic method for low-temperature dehydration of desiccant substance. Solar thermal energy can also be directly utilised for marginally heating the desiccant substance during the regeneration process. Overall, this system can contribute to the development of energy efficient buildings.

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Numerical study on performance of a desiccant cooling system with indirect evaporative cooler

Cited by 56 publications

References 14 publications

Analysis of the multi-stage desiccant cooling system performance in Wrocław (Poland)

Analysis of the multi-stage desiccant cooling system performance in Wrocław (Poland)

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

Experimental study of an ultrasonic regenerative evaporative cooler for a desiccant cooling system

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