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Research Papers

Performance Analysis of Solar-Assisted Desiccant Cooling System Cycles in World Climate Zones

[+] Author and Article Information
Muzaffar Ali

Energy Department,
Austrian Institute of Technology,
Giefinggasse 2,
Vienna 1210, Austria;
Energy/Mechanical Engineering Department,
University of Engineering and Technology,
Taxila 47050, Pakistan

Vladimir Vukovic

Centre for Construction Innovation and Research,
School of Science, Engineering and Design,
Teesside University,
Middlesbrough TS1 3BX, UK

Hafiz Muhammad Ali

Energy/Mechanical Engineering Department,
University of Engineering and Technology,
Taxila 47050, Pakistan
e-mail: h.m.ali@uettaxila.edu.pk

Nadeem Ahmed Sheikh

Mechanical Engineering Department,
HITEC University,
Taxila 47050, Pakistan

1Corresponding author.

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING: INCLUDING WIND ENERGY AND BUILDING ENERGY CONSERVATION. Manuscript received March 21, 2017; final manuscript received January 24, 2018; published online April 9, 2018. Assoc. Editor: Wojciech Lipinski.

J. Sol. Energy Eng 140(4), 041009 (Apr 09, 2018) (14 pages) Paper No: SOL-17-1096; doi: 10.1115/1.4039426 History: Received March 21, 2017; Revised January 24, 2018

The demand for affordable, environment-friendly, and reliable water conditioning systems has led to the introduction of several standalone and/or hybrid alternatives. The technology of desiccant evaporative cooling (DEC) has proven to be dependable and has gained success at places where initially it was deemed unfeasible. Today, a number of related technologies and configurations are available. Among them, solar-assisted desiccant cooling system (SADCS) offers a cheap eco-friendly alternative, especially in hybrid configurations. Most studies have investigated the performance of numerous SADCS configurations in specific climatic conditions; however, at the global- and system-level scale, no such study is available. The current study investigates five different SADCS configurations using equation-based object-oriented modeling and simulation approach in five different climatic conditions. The selected climatic conditions cover a wide range of global weather data including arid/semiarid (Karachi), dry summer tropical (Adelaide), and mesothermal (Sao Paulo, Shanghai) to continental conditions (Vienna). The performance of all selected SADCS configurations (ventilation cycle, recirculation and ventilated-recirculation cycles, dunkle and ventilated-dunkle cycle) is analyzed for specified cooling design day of the selected cities. A uniform system control strategy based on the idea of displacement distribution (ventilation) system is used for each configuration and climatic zone. By monitoring their performances based on the values of cooling capacity (CC) and coefficient of performance (COP), the best SADCS configuration is proposed for each considered climatic condition in the world. The results revealed that the climates of Vienna, Sao Paulo, and Adelaide favor the use of ventilated-dunkle cycle configuration with average COP of 0.36, 0.84, and 0.93, respectively, while ventilation cycle based on DEC configuration suits the climate of Karachi and Shanghai with an average COP of 2.32 and 2.90, respectively.

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Figures

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Fig. 3

Climate conditions of selected cities with respect to cooling design day: dry-bulb temperature (a), relative humidity (b), global horizontal radiation (c), and wind velocity (d)

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Fig. 2

Solar-assisted desiccant cooling system with liquid solar collector, storage tank, and back-up heat source

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Fig. 1

Schematic representation of different DEC system configurations: ventilation (a), recirculation (b), ventilated-recirculation (c), dunkle (d), and dunkle-ventilated cycles (e)

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Fig. 4

Component models of solar thermal collector

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Fig. 5

Dymola representation of solar thermal system model

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Fig. 6

Control strategy of supply humidifier

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Fig. 7

Control strategy of return humidifier

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Fig. 8

Control strategy of heater and solar thermal system combination

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Fig. 9

Overall control strategy of solar-assisted desiccant cooling system

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Fig. 10

Vienna: Performance comparison of three cycles with respect to: cooling capacity (a), COP (b), energy input requirement of three cycles with respect to: heater and solar system (c), temperature at inlet heat exchanger of solar system (d), COP of ventilated-recirculation cycle (e), and COP of ventilated-dunkle cycle (f)

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Fig. 11

Karachi: Performance comparison of three cycles with respect to: cooling capacity (a), COP (b), energy input requirement of three cycles with respect to: heater and solar system (c), temperature at inlet heat exchanger of solar system (d), COP of ventilated-recirculation cycle (e), and COP of ventilated-dunkle cycle (f)

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Fig. 12

Sao Paulo: performance comparison of three cycles with respect to: cooling capacity (a), COP (b), energy input requirement of three cycles with respect to: heater and solar system (c), temperature at inlet heat exchanger of solar system (d), COP of ventilated-recirculation cycle (e), and COP of ventilated-dunkle cycle (f)

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Fig. 13

Shanghai: Performance comparison of three cycles with respect to: cooling capacity (a), COP (b), energy input requirement of three cycles with respect to: heater and solar system (c), temperature at inlet heat exchanger of solar system (d), COP of ventilated-recirculation cycle (e), and COP of ventilated-dunkle cycle (f)

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Fig. 14

Adelaide: Performance comparison of three cycles with respect to: cooling capacity (a), COP (b), energy input requirement of three cycles with respect to: heater and solar system (c), temperature at inlet heat exchanger of solar system (d), COP of ventilated-recirculation cycle (e), and COP of ventilated-dunkle cycle (f)

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Fig. 15

Comparison of average COP and average cooling capacity for all five climatic zones using five SADEC cycles. The averages are calculated for the design day for all three basic cycles (ventilation, recirculation, and dunkle).

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