Performance Analysis of Solar Desiccant-Evaporative Cooling for a Commercial Building under Different Australian Climates

Ma, Yunlong; Guan, Lisa

doi:10.1016/j.proeng.2015.08.1024

Cited by 29 publications

(24 citation statements)

References 21 publications

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“…Khan et al [47] found out that based on various collector areas, for Chennai city, the solar desiccant-assisted Dedicated Outdoor Air System (DOAS) integrated radiant cooling system could achieve 7.4% to 28.6% energy savings in comparison with the cooling coil-assisted DOAS radiant cooling system. In the last several decades, solar-assisted cooling technology has widely been evaluated worldwide, including solar electric cooling powered by PV [15][16][17], solar absorption cooling [18][19][20][21][22][23], solar adsorption cooling [24,25], and solar desiccant cooling [26][27][28][29][30][31][32][33][34][35]. A theoretical modelling with experimental validation studied by Nie et al [36] demonstrated that the solid desiccant cooling assisted by heat pump was more efficient than the conventional cooling system due to high efficient dehumidification capacity.…”

Section: Solar Air Conditioning Technology Reviewmentioning

confidence: 99%

Comparison of Different Solar-Assisted Air Conditioning Systems for Australian Office Buildings

Saha

Miller

et al. 2017

Energies

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Abstract:This study has investigated the feasibility of three different solar-assisted air conditioning systems for typical medium-sized office buildings in all eight Australian capital cities using the whole building energy simulation software EnergyPlus. The studied solar cooling systems include: solar desiccant-evaporative cooling (SDEC) system, hybrid solar desiccant-compression cooling (SDCC) system, and solar absorption cooling (SAC) system. A referenced conventional vapor compression variable-air-volume (VAV) system has also been investigated for comparison purpose. The technical, environmental, and economic performances of each solar cooling system have been evaluated in terms of solar fraction (SF), system coefficient of performance (COP), annual HVAC (heating, ventilation, and air conditioning) electricity consumption, annual CO 2 emissions reduction, payback period (PBP), and net present value (NPV). The results demonstrate that the SDEC system consumes the least energy in Brisbane and Darwin, achieving 56.9% and 82.1% annual energy savings, respectively, compared to the conventional VAV system, while for the other six cities, the SAC system is the most energy efficient. However, from both energy and economic aspects, the SDEC system is more feasible in Adelaide, Brisbane, Darwin, Melbourne, Perth, and Sydney because of high annual SF and COP, low yearly energy consumption, short PBP and positive NPV, while for Canberra and Hobart, although the SAC system achieves considerable energy savings, it is not economically beneficial due to high initial cost. Therefore, the SDEC system is the most economically beneficial for most of Australian cities, especially in hot and humid climates. The SAC system is also energy efficient, but is not as economic as the SDEC system. However, for Canberra and Hobart, reducing initial cost is the key point to achieve economic feasibility of solar cooling applications.

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Section: Solar Air Conditioning Technology Reviewmentioning

confidence: 99%

Comparison of Different Solar-Assisted Air Conditioning Systems for Australian Office Buildings

Saha

Miller

et al. 2017

Energies

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“…The total conditioned window-to-wall ratio (WWR) is 0.4, with the North and South facades of 36.5 m × 1.35 m, and the East and West facades of 18.3 m × 0.54 m for each floor. The selection of this building model is because it is recommended by the Australian building codes board (ABCB) to be a representative medium-sized commercial building in the central business district in Australia for energy modelling [16], and it is widely studied in other projects [16][17][18][19][20][21]. The climatic location is Brisbane, Australia.…”

Section: Building Characteristicsmentioning

confidence: 99%

Parametric Analysis of Design Parameter Effects on the Performance of a Solar Desiccant Evaporative Cooling System in Brisbane, Australia

Saha

Miller

et al. 2017

Energies

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Solar desiccant cooling is widely considered as an attractive replacement for conventional vapor compression air conditioning systems because of its environmental friendliness and energy efficiency advantages. The system performance of solar desiccant cooling strongly depends on the input parameters associated with the system components, such as the solar collector, storage tank and backup heater, etc. In order to understand the implications of different design parameters on the system performance, this study has conducted a parametric analysis on the solar collector area, storage tank volume, and backup heater capacity of a solid solar desiccant cooling system for an office building in Brisbane, Australia climate. In addition, a parametric analysis on the outdoor air humidity ratio control set-point which triggers the operation of the desiccant wheel has also been investigated. The simulation results have shown that either increasing the storage tank volume or increasing solar collector area would result in both increased solar fraction (SF) and system coefficient of performance (COP), while at the same time reduce the backup heater energy consumption. However, the storage tank volume is more sensitive to the system performance than the collector area. From the economic aspect, a storage capacity of 30 m 3 /576 m 2 has the lowest life cycle cost (LCC) of $405,954 for the solar subsystem. In addition, 100 kW backup heater capacity is preferable for the satisfaction of the design regeneration heating coil hot water inlet temperature set-point with relatively low backup heater energy consumption. Moreover, an outdoor air humidity ratio control set-point of 0.008 kgWater/kgDryAir is more reasonable, as it could both guarantee the indoor design conditions and achieve low backup heater energy consumption.

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“…Recently, there have been several research works on solid desiccant assisted air conditioning which investigate various related technical and economic performances of the systems and different components like as dehumidifier, heat wheel, sensible cooling coil etc. [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. Earlier, Henning [15] conducted a review on various possible system configurations based on different operating conditions suitable for variable ambient climate for the tropical regions whilst Camargo and Ebinuma [16] developed thermodynamic equations of the system with focus on the hot and humid climatic conditions.…”

Section: Introductionmentioning

confidence: 99%

An overview on use of desiccant dehumidifiers in modern air-conditioning

2019

Open J Archit Eng

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The solid desiccant based dehumidifier used in conjunction with the conventional HVAC combines the dehumidification of solid desiccant system and with the cooling capacity of the conventional air conditioning system. This hybrid cooling system provides thermal comfort to the occupants of the conditioned space. The hybrid systems main appeal lies in the fact that, it consumes much lesser high grade electrical energy as compared to the dedicated standalone traditional air conditioning systems. The electrical energy usage is possible still lower by use of primary energy sources for to supply the thermal energy needed for the desiccant regeneration. For this purpose freely available renewable solar energy or industrial waste heat can also be used for the regeneration heat source. Sometimes it is also possible to provide condenser waste heat for the part of desiccant reactivation heat supply may increase the overall performance of the system. It was also found that this cooling system with use of air to air waste heat recovery wheel performed better than without it in terms of dehumidification as well as cooling performance. The present study report important literature survey on the dehumidification potentials of desiccant integrated hybrid cooling system operating in hot and humid climates. Keywords: Hybrid air-conditioning; Rotary desiccant dehumidifier; Heat recovery wheel; Regeneration heat; Renewable solar energy; Waste heat

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Performance Analysis of Solar Desiccant-Evaporative Cooling for a Commercial Building under Different Australian Climates

Cited by 29 publications

References 21 publications

Comparison of Different Solar-Assisted Air Conditioning Systems for Australian Office Buildings

Comparison of Different Solar-Assisted Air Conditioning Systems for Australian Office Buildings

Parametric Analysis of Design Parameter Effects on the Performance of a Solar Desiccant Evaporative Cooling System in Brisbane, Australia

An overview on use of desiccant dehumidifiers in modern air-conditioning

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