Optimization of solar collector surface in solar desiccant wheel cycle

Hatami, Zahra; Saidi, Mohammad Hassan; Mohammadian, Masoud; Aghanajafi, Cyrus

doi:10.1016/j.enbuild.2011.11.002

Cited by 24 publications

(7 citation statements)

References 9 publications

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“…The electrical COP could be greater than 20 when the regeneration temperature was 70 • C, supply and regeneration airflow ratio was 0.67 and the extraction air ratio of IEC was 0.3. Hatami et al [65] conducted an optimization study of the solar collector surface requirement in a desiccant evaporative cooling cycle. They concluded that after considering the design parameters and operating conditions of the desiccant wheel, the compulsory solar collector areas could decrease by 45% compared to an empirical model.…”

Section: Development Of the Integrated Cooling Systemmentioning

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: Development Of the Integrated Cooling Systemmentioning

confidence: 99%

Evaporative Cooling Integrated with Solid Desiccant Systems: A Review

et al. 2021

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“…where functions f i and g i are simulation functions that are achieved by means of numerical modeling of the desiccant wheel in order to provide a correlation between di erent desiccant wheel parameters and outlet temperature, T out , and e ectiveness, " [27]. These functions are themselves composed of desiccant wheel variables and can be given as follows [4,27]:…”

Section: Flow Model For the Process Air (1-2)mentioning

confidence: 99%

“…Due to the exibility of the application and e ciency of desiccant cooling systems, studying their characteristics and performance and also investigating the potentiality of using them in di erent climates have engrossed a great deal of attention among researchers recently. Hatami et al [4] presented a mathematical procedure to optimize the solar collector surface in solar desiccant wheel cycle. In their proposed cooling cycle, the thermal solar energy is used to provide the energy required for regeneration of air of desiccant wheel cycle.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of novel trombe wall-assisted desiccant wheel

et al. 2019

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In the present study, a novel Trombe wall-assisted desiccant wheel system is modeled, in which the trombe wall is divided into three equal parts and provides the heat required for regeneration of the desiccant wheel. Separate mathematical models have been proposed for di erent components of the system such as desiccant wheel and Trombe wall. The mathematical models of di erent parts have been assembled. E ects of the geometrical parameters of the Trombe wall on the regeneration temperature of the desiccant wheel have been investigated based on the integrated model. The results of the present study for some special cases have been compared with results available in open literature. The optimal surface area of the Trombe wall has been extracted according to the parameters of the desiccant wheel. Results show that the solar energy received by the Trombe wall is 600-740 W/m 2 (1 May-15 August) in the warm and humid climate of Gilan (Iran), the temperature of the wall surface is obtained 77-86 C, and the outlet temperature of regeneration air stream from Trombe wall is obtained 60-70 C; however, the output humidity of the desiccant wheel is reduced from 23 gw/kga to 10-12 gw/kga in the studied region (Gilan, Iran).

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“…Tsay et al 17 studied the noncondensing air-conditioning system performance, Li et al 18 studied the effects of pore sizes of porous silica gels on desorption, and Majumdar and Worek 19 studied the performance of an open-cycle desiccant cooling system. Sphaier and N obrega, 20 Hatamia et al 21 and Chung et al 22 studied the optimization of desiccant cooling system and Ge et al 23 reviewed the applicability of using solar energy. To improve the solid desiccant wheel systems, several researchers have proposed desiccant-coated heat exchangers (DCHEs) recently, 24,25 in which the adsorption material can be coated or sprayed directly onto the surface of a fin tube heat exchanger.…”

Section: Introductionmentioning

confidence: 99%

Investigation on heat and mass transfer characteristics for a zeolite-coated heat exchanger using comparatively low-temperature energy: Heating humidification mode and cooling dehumidification mode

Park¹,

Lee

2020

Indoor and Built Environment

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Desiccant-based hybrid air-conditioning technologies are currently being developed to reduce energy consumption and enhance the effectiveness of indoor thermal environmental control in buildings. The purpose of this study is to propose a compact desiccant-based outdoor air-conditioning system that directly uses heated desorption and cooled adsorption with comparatively low-temperature energy, and to propose a mathematical model for the system by investigating the heat and mass transfer characteristics of a zeolite-coated heat exchanger (ZCHE). To study the heat and mass transfer characteristics of the ZCHE, the moisture removal capacity and the moisture removal regeneration were measured at various heat source temperatures and water flow rates using an experimental model. The measured values were adopted as boundary condition for mathematical model. The results show that the air-conditioning performance of the ZCHE is strongly dependent on the water temperature under constant air conditions. The humidification capacity of the ZCHE was measured 25.0 g at 5 kW heat capacity and the humidification capacity was measured 10.2 g at 0.6 kW cooling capacity. The relative errors of mass transfer coefficient and heat transfer coefficient are ±3.6% and ±3.8%, respectively. Moreover, the proposed mathematical model fitted well with measured values.

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Optimization of solar collector surface in solar desiccant wheel cycle

Cited by 24 publications

References 9 publications

Evaporative Cooling Integrated with Solid Desiccant Systems: A Review

Evaporative Cooling Integrated with Solid Desiccant Systems: A Review

Numerical simulation of novel trombe wall-assisted desiccant wheel

Investigation on heat and mass transfer characteristics for a zeolite-coated heat exchanger using comparatively low-temperature energy: Heating humidification mode and cooling dehumidification mode

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