Studies on solid desiccant based hybrid air-conditioning systems

Dhar, Purbarun; Singh, Sunaina

doi:10.1016/s1359-4311(00)00035-1

Cited by 98 publications

(34 citation statements)

References 3 publications

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“…9, electrical energy in average decreases 20% by HDCS. The results confirm the findings of earlier studies about electrical energy saving of HDCS (Dhar and Singh 2001;Subramanyam et al 2004a, b;Jia et al 2006;Saidi and Vazirifard 2007;Dai et al 2001).…”

Section: Resultssupporting

confidence: 91%

“…Compressor consumes 65% of the total energy, and the residue is used by the fans and the desiccant wheel that are not commonly considered in the modeling of HDCS. Even in most of the modeling, compressor energy consumption is calculated by approximating correlations that consequently decreases precision of the results (Dhar and Singh 2001;Subramanyam et al 2004a;Dai et al 2001).…”

Section: Design and Operation Of Experimental Setupmentioning

confidence: 99%

“…They have assessed that energy savings come about developing hybrid desiccant/vapor compression air-conditioning systems; also they have made recommendations for further research into the concept (Schlepp and Schultz 1984). Dhar cycles, which include a new proposed cycle, for typical hot-dry and hot-humid weather conditions (Dhar and Singh 2001). Subramanyam et al have applied desiccant wheel to control humidity in airconditioning systems.…”

Section: Introductionmentioning

confidence: 99%

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Performance assessment of hybrid desiccant cooling system at various climates

Mandegari¹,

Pahlavanzadeh²

2009

Energy Efficiency

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In our work, operation of hybrid desiccant cooling system (HDCS) has been investigated based on experimental studies. Different climates have been created by changing the temperature and humidity of HDCS inlet air, using an electrical heater and a centrifuge humidifier. Input energies, temperature of various points, and their relative humidity have been measured at the created climates. Coefficient of performance (COP), thermal coefficient of performance, and electrical coefficient of performance (ECOP) of the HDCS have been calculated. As a reference situation, vapor compression system (VCS) was examined at the same condition as HDCS. Results show that COP of HDCS in comparison with VCS decreased about 36% and 28% in hot-dry and hot-humid climates, respectively, which is due to the thermal energy consumption in HDCS. In contrast its ECOP increased, which means that by using HDCS some electrical energy would be saved. Defining operating cost index (OCI) parameter, operation costs of VCS and HDCS have been compared. Analyzing the OCI results shows that in HDCS, although decreasing the electricity consumption results in more usage of natural gas, these systems are economical especially in those countries with low natural gas prices.

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Section: Resultssupporting

confidence: 91%

Section: Design and Operation Of Experimental Setupmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Performance assessment of hybrid desiccant cooling system at various climates

Mandegari¹,

Pahlavanzadeh²

2009

Energy Efficiency

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“…[18][19][20][21][22][23]). While most of the systems rely on vapour compression chillers, further heat sinks are enabled through the possible increase of the required cold water temperature.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of a ground-coupled desiccant assisted air conditioning system

Speerforck

Schmitz

2016

Applied Energy

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h i g h l i g h t sA ground-coupled desiccant assisted air conditioning system is evaluated experimentally. The evaluation is carried out for steady state operation and the cooling period as a whole. The suitability of the system to provide comfort conditions is examined demonstrated. Energy comparisons with other air-conditioning systems are performed. The performance of the borehole heat exchangers for cooling is evaluated. a b s t r a c tIn a pilot installation at Hamburg University of Technology the coupled operation of an open cycle desiccant assisted air conditioning system with borehole heat exchangers is investigated. The paper presents experimental data recorded during the cooling period 2014. Results show that the electricity demand of the system can be reduced to the parasitic consumption of the fans, wheels and pumps. An electric energy efficiency ratio of 6.63 is achieved, enabling electricity savings of more than 70% compared to a conventional reference system and 54% compared to a desiccant assisted hybrid system relying on an electric chiller. Comfort conditions can be maintained during the whole cooling period. The borehole heat exchangers work highly efficient, exhibiting a seasonal performance factor of 192.

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“…Alternatively a desiccant adsorption system such as a rotary dehumidifier can be used. Both technologies have wide application in building service applications for air conditioning system [3][4][5][6][7]. The use of regeneration heating in desiccant rotary dryers has a limitations in energy saving.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of an Energy Efficient Hybrid System for Surface Drying

Wang

Calay

Chen

2010

Proceedings of the International Symposium on Innovative Materials for Processes in Energy Systems 2010

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Rapid surface drying is an important and energy intensive process in food and beverage packaging industry. Usually these products are dried at low dew point temperatures (DPT) -10 ~ -20°C and low dry ball temperatures (DBT) 20 ~ 30°C for product quality optimization. The conveyor moves at very high speeds and it is necessary to expose as much of the drying surface to the drying effect in a shortest time possible. Re-condensation is a big problem in these systems and a good drying system is that preserves the quality of the product and is energy efficient. This paper presents a feasibility study to obtain the design parameters of a hybrid dryer suited for rapid drying applications. Drying process of a recirculation heat pump is integrated with rotary dehumidifier (desiccant wheel) system. The system employed a refrigerant circuit in conjunction with a heat reactivated desiccant wheel to provide efficient drying capability and supply low DPT conditions. To increase the economic practicality of such a hybrid system, the combined system utilises the heat dissipated by the condenser in regenerating the desiccant wheel. The study shows that the proposed hybrid system can deliver supply air at much lower DPT compared to the single refrigerant circuit and a desiccant wheel. By operating the combined system in tandem, greater amount of dehumidification could be realised due to the improved ratio of latent to total load at the hybrid. Up to 60% heat energy can be saved in rapid surface drying applications by using the proposed hybrid system.

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Studies on solid desiccant based hybrid air-conditioning systems

Cited by 98 publications

References 3 publications

Performance assessment of hybrid desiccant cooling system at various climates

Performance assessment of hybrid desiccant cooling system at various climates

Experimental investigation of a ground-coupled desiccant assisted air conditioning system

Experimental Study of an Energy Efficient Hybrid System for Surface Drying

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