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

Comino, Francisco; Castillo-González, Jesús; Navas‐Martos, Francisco J.

doi:10.1016/j.applthermaleng.2019.114579

Cited by 46 publications

(13 citation statements)

References 30 publications

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“…It has a cyclic operation. In charging mode, water is heated passively by the solar collector (1) and the hot water is collected in a hot water storage tank (2). The tank is connected to a water to air heat exchanger with a pipeline where the hot water circulates in between (3)(4)(5).…”

Section: Process Designmentioning

confidence: 99%

“…Currently, conventional vapor compression based HVAC systems are widely used. However, these systems present some restrictions due to the environmental problems derived from the use of refrigerant gases and considerable energy consumption [2].…”

Section: Introductionmentioning

confidence: 99%

“…Depending on bed thickness, airflow arrangement and air velocity, the humidity ratio of airflow supplied to the building can be increased from 1.5 g/kg to 4.8 -5.8 g/kg when the indoor humidity ratio is 5.8 g/kg and the regeneration temperature is around 50 °C. Comino et al [2] experimentally determined the seasonal coefficient of performance (SCOP) of a solar driven desiccant cooling system to control indoor conditions in a research lab room. The experimental results showed that the system independently adjusted the temperature and humidity of the supply air.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of a Storage Type Solar-Driven Solid Desiccant Cooling System

Khosravi¹,

Aydın²

2021

Gazi Üniversitesi Fen Bilimleri Dergisi Part C: Tasarım Ve Teknoloji

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Solar-driven solid desiccant assisted evaporative cooling could be an effective alternative to conventional vapour compression cooling systems due to its lower operating costs and lower environmental impact. This technology has been widely investigated for continuous operation through the use of desiccant wheels. However, the investigation of such technology for storing solar radiation in the form of coolth energy is missing in the literature. In that regard, primary objective of the present study is to investigate a fixed bed solar driven desiccant assisted evaporative cooling system, that uses vermiculite-calcium chloride composite sorbent, to be utilized as a coolth storage in hot-humid climate. To achieve this aim, a prototype unit was designed, developed and tested under real climatic conditions of North Cyprus. According to the results, over six hours of charging period, at regeneration temperature between 51 -62 °C and air mass flow rate of 0.03 kg/s, average moisture desorption rate of 3.9 g/min was obtained. On the other hand, over four hours of discharging at air inlet temperature of 32 -35 °C and mass flow rate of 0.06 kg/s, vermiculite-calcium chloride / wood chips couple provided average air temperature drop and cooling capacity of 8.4 °C and 0.49 kW respectively. Hygrothermal efficiency of the system is also found 0.65. Additionally, the average wet-bulb effectiveness and average dew-point effectiveness were obtained as 121.6%, and 90.2% respectively. Furthermore average total and thermal coefficient of performance of 0.35 and 0.6 were achieved over the three consecutive cycles. These results suggest that the proposed system could be a potential technology for storing solar energy to be used in air conditioning applications in buildings.

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Section: Process Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Investigation of a Storage Type Solar-Driven Solid Desiccant Cooling System

Khosravi¹,

Aydın²

2021

Gazi Üniversitesi Fen Bilimleri Dergisi Part C: Tasarım Ve Teknoloji

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“…The energy consumption of different hybrid HVAC systems was analyzed in other research studies [27][28][29][30][31]. A numerical study showed a COP value of 2.1 using a solar desiccant cooling system when operating in cooling mode [28]. The COP value did not decrease significantly, 2.0, when the system worked in cooling-dehumidification mode.…”

Section: Introductionmentioning

confidence: 99%

“…The COP value did not decrease significantly, 2.0, when the system worked in cooling-dehumidification mode. Furthermore, 75% of the total energy consumed came from solar thermal energy and outdoor air [28]. In another work, it was observed that a maximum of 52% energy saving was achieved in an office with occupancy automatic control as compared to the conventional control of cooling systems [29].…”

Section: Introductionmentioning

confidence: 99%

Seasonal Analysis Comparison of Three Air-Cooling Systems in Terms of Thermal Comfort, Air Quality and Energy Consumption for School Buildings in Mediterranean Climates

2021

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Efficient air-cooling systems for hot climatic conditions, such as Southern Europe, are required in the context of nearly Zero Energy Buildings, nZEB. Innovative air-cooling systems such as regenerative indirect evaporative coolers, RIEC and desiccant regenerative indirect evaporative coolers, DRIEC, can be considered an interesting alternative to direct expansion air-cooling systems, DX. The main aim of the present work was to evaluate the seasonal performance of three air-cooling systems in terms of air quality, thermal comfort and energy consumption in a standard classroom. Several annual energy simulations were carried out to evaluate these indexes for four different climate zones in the Mediterranean area. The simulations were carried out with empirically validated models. The results showed that DRIEC and DX improved by 29.8% and 14.6% over RIEC regarding thermal comfort, for the warmest climatic conditions, Lampedusa and Seville. However, DX showed an energy consumption three and four times higher than DRIEC for these climatic conditions, respectively. RIEC provided the highest percentage of hours with favorable indoor air quality for all climate zones, between 46.3% and 67.5%. Therefore, the air-cooling systems DRIEC and RIEC have a significant potential to reduce energy consumption, achieving the user’s thermal comfort and improving indoor air quality.

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