The Experts below are selected from a list of 9462 Experts worldwide ranked by ideXlab platform

Yanjun Dai - One of the best experts on this subject based on the ideXlab platform.

  • A technical review on use of liquid-desiccant dehumidification for Air-Conditioning Application
    Renewable & Sustainable Energy Reviews, 2008
    Co-Authors: L. Mei, Yanjun Dai
    Abstract:

    Liquid-desiccant dehumidification has been proved to be an effective method to extract the moisture of Air with relatively less energy consumption, especially compared with conventional vapour compression system. To date, the conventional dehumidification mode with desiccant solution has been improved or replaced by newly emerged energy-saving systems with better performance. This paper gives a detailed account of the general features of the major desiccant dehumidification techniques and configurations of the related systems; meanwhile, attention has been paid to both technological and theoretical development of regenerator, which is an indispensable component of the liquid-desiccant dehumidification system. Moreover, a summary of the experimental and analytical studies to optimize the system performance has been made. Some new hybrid systems that greatly expand the desiccant dehumidification technique in industrial and residential Applications, as well as effectively promoting the single system's performance, are also introduced. Finally, future study and Application for liquid-desiccant dehumidification techniques are concluded.

Hadeed Ashraf - One of the best experts on this subject based on the ideXlab platform.

  • dynamic evaluation of desiccant dehumidification evaporative cooling options for greenhouse Air Conditioning Application in multan pakistan
    Energies, 2021
    Co-Authors: Hadeed Ashraf, Muhammad Sultan, Redmond R Shamshiri, Farrukh Abbas, Muhammad Farooq, Uzair Sajjad, Hafiz Mdtahir, Muhammad H Mahmood, Fiaz Ahmad, Yousaf R Taseer
    Abstract:

    This study provides insights into the feasibility of a desiccant dehumidification-based Maisotsenko cycle evaporative cooling (M-DAC) system for greenhouse Air-Conditioning Application. Conventional cooling techniques include direct evaporative cooling, refrigeration systems, and passive/active ventilation. which are commonly used in Pakistan; however, they are either not feasible due to their energy cost, or they cannot efficiently provide an optimum microclimate depending on the regions, the growing seasons, and the crop being cultivated. The M-DAC system was therefore proposed and evaluated as an alternative solution for Air Conditioning to achieve optimum levels of vapor pressure deficit (VPD) for greenhouse crop production. The objective of this study was to investigate the thermodynamic performance of the proposed system from the viewpoints of the temperature gradient, relative humidity level, VPD, and dehumidification gradient. Results showed that the standalone desiccant Air-Conditioning (DAC) system created maximum dehumidification gradient (i.e., 16.8 g/kg) and maximum temperature gradient (i.e., 8.4 °C) at 24.3 g/kg and 38.6 °C ambient Air conditions, respectively. The DAC coupled with a heat exchanger (DAC+HX) created a temperature gradient nearly equal to ambient Air conditions, which is not in the optimal range for greenhouse growing conditions. Analysis of the M-DAC system showed that a maximum Air temperature gradient, i.e., 21.9 °C at 39.2 °C ambient Air condition, can be achieved, and is considered optimal for most greenhouse crops. Results were validated with two microclimate models (OptDeg and Cft) by taking into account the optimality of VPD at different growth stages of tomato plants. This study suggests that the M-DAC system is a feasible method to be considered as an efficient solution for greenhouse Air-Conditioning under the climate conditions of Multan (Pakistan).

  • investigating solid and liquid desiccant dehumidification options for room Air Conditioning and drying Applications
    Sustainability, 2020
    Co-Authors: Muhammad Sultan, Takahiko Miyazaki, Kiran B Naik, Mullapudi Joshi, P Muthukumar, Redmond R Shamshiri, Hadeed Ashraf
    Abstract:

    This study reports on the investigation of the performance of single and two-stage liquid and solid desiccant dehumidification systems and two-stage combined liquid and solid desiccant dehumidification systems with reference to humid climates. The research focus is on a dehumidification system capacity of 25 kW designed for room Air Conditioning Application using the thermal models reported in the literature. RD-type silica gel and LiCl are used as solid and liquid desiccant materials, respectively. In this study, the Application of proposed system for deep drying Application is also explored. Condensation rate and moisture removal efficiency are chosen as performance parameters for room Air Conditioning Application, whereas Air outlet temperature is chosen as performance parameter for deep drying Application. Further, for a given range of operating parameters, influences of Air inlet humidity ratio, flow rate, and inlet temperature on performance parameters of the systems are investigated. In humid climatic conditions, it has been observed that a two-stage liquid desiccant dehumidification system is more effective for room Air Conditioning Application, and two-stage solid desiccant dehumidification system is more suitable for deep drying Application in the temperature range of 50 to 70 °C, while single-stage solid desiccant and two-stage combined liquid and solid desiccant dehumidification systems are more effective for low temperature, i.e., 30 to 50 °C deep drying Application.

L. Mei - One of the best experts on this subject based on the ideXlab platform.

  • A technical review on use of liquid-desiccant dehumidification for Air-Conditioning Application
    Renewable & Sustainable Energy Reviews, 2008
    Co-Authors: L. Mei, Yanjun Dai
    Abstract:

    Liquid-desiccant dehumidification has been proved to be an effective method to extract the moisture of Air with relatively less energy consumption, especially compared with conventional vapour compression system. To date, the conventional dehumidification mode with desiccant solution has been improved or replaced by newly emerged energy-saving systems with better performance. This paper gives a detailed account of the general features of the major desiccant dehumidification techniques and configurations of the related systems; meanwhile, attention has been paid to both technological and theoretical development of regenerator, which is an indispensable component of the liquid-desiccant dehumidification system. Moreover, a summary of the experimental and analytical studies to optimize the system performance has been made. Some new hybrid systems that greatly expand the desiccant dehumidification technique in industrial and residential Applications, as well as effectively promoting the single system's performance, are also introduced. Finally, future study and Application for liquid-desiccant dehumidification techniques are concluded.

Kiran B Naik - One of the best experts on this subject based on the ideXlab platform.

  • investigating solid and liquid desiccant dehumidification options for room Air Conditioning and drying Applications
    Sustainability, 2020
    Co-Authors: Muhammad Sultan, Takahiko Miyazaki, Kiran B Naik, Mullapudi Joshi, P Muthukumar, Redmond R Shamshiri, Hadeed Ashraf
    Abstract:

    This study reports on the investigation of the performance of single and two-stage liquid and solid desiccant dehumidification systems and two-stage combined liquid and solid desiccant dehumidification systems with reference to humid climates. The research focus is on a dehumidification system capacity of 25 kW designed for room Air Conditioning Application using the thermal models reported in the literature. RD-type silica gel and LiCl are used as solid and liquid desiccant materials, respectively. In this study, the Application of proposed system for deep drying Application is also explored. Condensation rate and moisture removal efficiency are chosen as performance parameters for room Air Conditioning Application, whereas Air outlet temperature is chosen as performance parameter for deep drying Application. Further, for a given range of operating parameters, influences of Air inlet humidity ratio, flow rate, and inlet temperature on performance parameters of the systems are investigated. In humid climatic conditions, it has been observed that a two-stage liquid desiccant dehumidification system is more effective for room Air Conditioning Application, and two-stage solid desiccant dehumidification system is more suitable for deep drying Application in the temperature range of 50 to 70 °C, while single-stage solid desiccant and two-stage combined liquid and solid desiccant dehumidification systems are more effective for low temperature, i.e., 30 to 50 °C deep drying Application.

Redmond R Shamshiri - One of the best experts on this subject based on the ideXlab platform.

  • dynamic evaluation of desiccant dehumidification evaporative cooling options for greenhouse Air Conditioning Application in multan pakistan
    Energies, 2021
    Co-Authors: Hadeed Ashraf, Muhammad Sultan, Redmond R Shamshiri, Farrukh Abbas, Muhammad Farooq, Uzair Sajjad, Hafiz Mdtahir, Muhammad H Mahmood, Fiaz Ahmad, Yousaf R Taseer
    Abstract:

    This study provides insights into the feasibility of a desiccant dehumidification-based Maisotsenko cycle evaporative cooling (M-DAC) system for greenhouse Air-Conditioning Application. Conventional cooling techniques include direct evaporative cooling, refrigeration systems, and passive/active ventilation. which are commonly used in Pakistan; however, they are either not feasible due to their energy cost, or they cannot efficiently provide an optimum microclimate depending on the regions, the growing seasons, and the crop being cultivated. The M-DAC system was therefore proposed and evaluated as an alternative solution for Air Conditioning to achieve optimum levels of vapor pressure deficit (VPD) for greenhouse crop production. The objective of this study was to investigate the thermodynamic performance of the proposed system from the viewpoints of the temperature gradient, relative humidity level, VPD, and dehumidification gradient. Results showed that the standalone desiccant Air-Conditioning (DAC) system created maximum dehumidification gradient (i.e., 16.8 g/kg) and maximum temperature gradient (i.e., 8.4 °C) at 24.3 g/kg and 38.6 °C ambient Air conditions, respectively. The DAC coupled with a heat exchanger (DAC+HX) created a temperature gradient nearly equal to ambient Air conditions, which is not in the optimal range for greenhouse growing conditions. Analysis of the M-DAC system showed that a maximum Air temperature gradient, i.e., 21.9 °C at 39.2 °C ambient Air condition, can be achieved, and is considered optimal for most greenhouse crops. Results were validated with two microclimate models (OptDeg and Cft) by taking into account the optimality of VPD at different growth stages of tomato plants. This study suggests that the M-DAC system is a feasible method to be considered as an efficient solution for greenhouse Air-Conditioning under the climate conditions of Multan (Pakistan).

  • investigating solid and liquid desiccant dehumidification options for room Air Conditioning and drying Applications
    Sustainability, 2020
    Co-Authors: Muhammad Sultan, Takahiko Miyazaki, Kiran B Naik, Mullapudi Joshi, P Muthukumar, Redmond R Shamshiri, Hadeed Ashraf
    Abstract:

    This study reports on the investigation of the performance of single and two-stage liquid and solid desiccant dehumidification systems and two-stage combined liquid and solid desiccant dehumidification systems with reference to humid climates. The research focus is on a dehumidification system capacity of 25 kW designed for room Air Conditioning Application using the thermal models reported in the literature. RD-type silica gel and LiCl are used as solid and liquid desiccant materials, respectively. In this study, the Application of proposed system for deep drying Application is also explored. Condensation rate and moisture removal efficiency are chosen as performance parameters for room Air Conditioning Application, whereas Air outlet temperature is chosen as performance parameter for deep drying Application. Further, for a given range of operating parameters, influences of Air inlet humidity ratio, flow rate, and inlet temperature on performance parameters of the systems are investigated. In humid climatic conditions, it has been observed that a two-stage liquid desiccant dehumidification system is more effective for room Air Conditioning Application, and two-stage solid desiccant dehumidification system is more suitable for deep drying Application in the temperature range of 50 to 70 °C, while single-stage solid desiccant and two-stage combined liquid and solid desiccant dehumidification systems are more effective for low temperature, i.e., 30 to 50 °C deep drying Application.