Performance Assessment of a Solar-Assisted Desiccant-Based Air Handling Unit Considering Different Scenarios

Angrisani, Giovanni; Roselli, Carlo; Sasso, Maurizio; Tariello, Francesco; Vanoli, Giuseppe Peter

doi:10.3390/en9090724

Cited by 13 publications

(6 citation statements)

References 29 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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“…Ghulam Qadar Chaudhary et al found that solar energy contributes 70% of the regenerative heat in the system [17]. Other scholars have proved the high utilization rate of solar thermal energy through solar fraction [18], which can also reach 0.67 in March [19]. However, with regard to solar energy, there is no sufficient regeneration heat to ensure the effective operation of the desiccant wheel in days of high humidity and low solar radiation [20].…”

Section: Introductionmentioning

confidence: 99%

Effect of Evaporator Position on Heat Pump Assisted Solid Desiccant Cooling Systems

2020

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The packaged terminal air conditioning with reheat (PTACR) system, as a commonly used dehumidification system, faces the problem of extra energy consumption in the deep-cooling and reheating processes. Therefore, different heat pump assisted hybrid solid desiccant cooling (HPDC) systems were proposed and their characteristics were investigated via EnergyPlus simulations. The system energy efficiency presents an upward trend with the increase in outdoor temperature and humidity. A high-humidity climate leads to the improvement of system performance. The dehumidification performance of the desiccant wheel in the HPDC system declines when outdoor humidity increases. Compared with the PTACR system, the energy consumption of the HPDC system in which the evaporator was placed upstream of the desiccant wheel is reduced by 36%, 66%, and 64%, respectively, under different high-humidity climates. The system maintained the indoor environment within the comfort zone, and eliminated the need for a heat source for desiccant regeneration. In conclusion, the HPDC system is an available alternative that considers both energy consumption and system performance. Placing the evaporator upstream of the desiccant wheel is more advantageous in high-temperature and high-humidity climates.

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“…Therefore, an efficient cooling system to reduce the high air temperatures generated in the dehumidification process and control the supply air temperature, would allow the sensible and latent heat to be decoupled. Numerous hybrid HVAC systems have been analysed by some authors in the available literature [11][12][13][14]. A DW integrated with a vapour compression system was analysed, where the evaporator was used to cool the process air and the condenser to thermally activate the DW [15,16], but these systems almost always depend on electrical energy.…”

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confidence: 99%

Experimental energy performance assessment of a solar desiccant cooling system in Southern Europe climates

Comino

Castillo-González²,

Navas‐Martos³

2020

Applied Thermal Engineering

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Solar desiccant cooling systems, SDEC, could be an effective alternative to conventional cooling systems, which mainly depend on electrical energy. The main objective of this work was to determine experimentally the seasonal coefficient of performance, SCOP, of a SDEC system composed of a desiccant wheel, an indirect evaporative cooler and a thermal solar system, to control indoor conditions in a research lab room. The dependence of coefficient of performance on outdoor air conditions and percentage of renewable energy used by the SDEC system were also analysed. Experimental tests were carried out for six weeks during spring and summer seasons in Martos, Spain.The experimental results showed that the SDEC system independently adjusted the temperature and humidity of the supply air. 75% of the energy consumed by this air handling system comes from renewable sources. A seasonal coefficient of performance of the SDEC system of 2 was obtained for the period analysed. It is shown that the higher the outdoor temperature, the higher instantaneous COPs is. These results suggest that the use of SDEC systems in hot climates, such as southern European climates, could contribute to achieve the EU's energy goals within the frame of Nearly Zero Energy Buildings.

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Performance Assessment of a Solar-Assisted Desiccant-Based Air Handling Unit Considering Different Scenarios

Cited by 13 publications

References 29 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

Effect of Evaporator Position on Heat Pump Assisted Solid Desiccant Cooling Systems

Experimental energy performance assessment of a solar desiccant cooling system in Southern Europe climates

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