Performance study of a solar absorption power-cooling system

In the present paper, an innovative low energy-intensive evaporative cooling system has been proposed for greenhouse application in near-tropical regions dominated by hot climate. The system can operate under dual- ventilation mode to maintain a favourable microclimate inside the greenhouse. A single ridge type un-even span greenhouse has been considered, targeting a few species of Indian tropical flowers. The greenhouse has a continuous roof vent as well as adjustable side vents and is equipped with exhaust fans on top and roll-up curtains on the sides. The greenhouse is surrounded by shallow water ponds outside its longitudinal walls and evaporative surfaces partially cover the free water surface. Inside the pond, low cost evaporative surfaces are so placed that they form air channels. Thus, outside air flows through the channels formed by the wetted surfaces over the water surface and undergoes evaporative cooling before entering the greenhouse. A simplified theoretical model has been presented in this paper to predict the inside greenhouse air temperature while ambient weather data are used as model inputs. The study reveals that during average radiation periods, the greenhouse can depends solely on natural ventilation and during peak radiation hours fan-induced ventilation is needed to maintain the required level of temperature. It is seen that under dual-ventilation mode greenhouse, temperature can be kept 3-6 oC lower than ambient temperature when saturation effectiveness is 0.7 and with 75% shading. Keywords: Greenhouse, Evaporative Cooling, Ventilation, Saturation Effectiveness, Wetted SurfaceArticle History: Received February 25th 2017; Received in revised form April 14th 2017; Accepted May 4th 2017; Available onlineHow to Cite This Article: Misra, D. and Ghosh, S., (2017) Performance Study of a Floricultural Greenhouse Surrounded by Shallow Water Ponds. International Journal of Renewable Energy Develeopment, 6(2), 137-144.https://doi.org/10.14710/ijred.6.2.137-144

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Exergoeconomic design criterion of solar absorption-subcooled compression hybrid cooling system based on the variable working conditions

Energy Conversion and Management ◽

10.1016/j.enconman.2018.11.004 ◽

2019 ◽

Vol 180 ◽

pp. 889-903 ◽

Cited By ~ 16

Author(s):

Yue Jing ◽

Zeyu Li ◽

Hongkai Chen ◽

Shengzi Lu ◽

Shiliang Lv

Keyword(s):

Working Conditions ◽

Cooling System ◽

Design Criterion ◽

Solar Absorption ◽

Hybrid Cooling

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A New Design of an Integrated Solar Absorption Cooling System Driven by an Evacuated Tube Collector: A Case Study for Baghdad, Iraq

Applied Sciences ◽

10.3390/app10103622 ◽

2020 ◽

Vol 10 (10) ◽

pp. 3622 ◽

Cited By ~ 1

Author(s):

Adil Al-Falahi ◽

Falah Alobaid ◽

Bernd Epple

Keyword(s):

Thermal Performance ◽

Air Conditioning ◽

Cooling System ◽

Electrical Power ◽

Energy Performance ◽

Coefficient Of Performance ◽

Solar Absorption ◽

Air Conditioning System ◽

Solar Fraction ◽

Design Variables

The electrical power consumption of refrigeration equipment leads to a significant influence on the supply network, especially on the hottest days during the cooling season (and this is besides the conventional electricity problem in Iraq). The aim of this work is to investigate the energy performance of a solar-driven air-conditioning system utilizing absorption technology under climate in Baghdad, Iraq. The solar fraction and the thermal performance of the solar air-conditioning system were analyzed for various months in the cooling season. It was found that the system operating in August shows the best monthly average solar fraction (of 59.4%) and coefficient of performance (COP) (of 0.52) due to the high solar potential in this month. Moreover, the seasonal integrated collector efficiency was 54%, providing a seasonal solar fraction of 58%, and the COP of the absorption chiller was 0.44, which was in limit, as reported in the literature for similar systems. A detailed parametric analysis was carried out to evaluate the thermal performance of the system and analyses, and the effect of design variables on the solar fraction of the system during the cooling season.

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Modelling and simulation of a solar absorption cooling system for India

Journal of Energy in Southern Africa ◽

10.17159/2413-3051/2006/v17i3a3290 ◽

2006 ◽

Vol 17 (3) ◽

pp. 65-70 ◽

Cited By ~ 4

Author(s):

V Mittal ◽

K S Kasana ◽

N S Thakur

Keyword(s):

Surface Area ◽

Cooling System ◽

Hot Water ◽

Coefficient Of Performance ◽

Reference Temperature ◽

Inlet Temperature ◽

Solar Absorption ◽

Absorption Cooling ◽

Solar Absorption Cooling ◽

Absorption Cooling System

This paper presents modelling and simulation of a solar absorption cooling system. In this paper, the modelling of a solar-powered, single stage, absorption cooling system, using a flat plate collector and water–lithium bromide solution, is done. A computer program has been developed for the absorption system to simulate various cycle configurations with the help of various weather data for the village Bahal, District Bhiwani, Haryana, India. The effects of hot water inlet temperatures on the coefficient of performance (COP) and the surface area of the absorption cooling component are studied. The hot water inlet temperature is found to affect the surface area of some of the system components. Moreover the effect of the reference temperature which is the minimum allowable hot water inlet temperature on the fraction of total load met by non-purchased energy (FNP) and coefficient of performance (COP) is studied and it is found that high reference temperature increases the system COP and decreases the surface area of system components but lower reference temperature gives better results for FNP than high reference temperatures.

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Advanced exergy assessment of a solar absorption power cycle

Renewable Energy ◽

10.1016/j.renene.2021.11.039 ◽

2021 ◽

Author(s):

Yan Cao ◽

Fateme Rostamian ◽

Mohammad Ebadollahi ◽

Mojtaba Bezaatpour ◽

Hadi Ghaebi

Keyword(s):

Solar Absorption ◽

Power Cycle ◽

Absorption Power

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Experimental assessment of solar absorption-subcooled compression hybrid cooling system

Solar Energy ◽

10.1016/j.solener.2019.04.055 ◽

2019 ◽

Vol 185 ◽

pp. 245-254 ◽

Cited By ~ 11

Author(s):

Jianting Yu ◽

Zeyu Li ◽

Erjian Chen ◽

Yongrui Xu ◽

Hongkai Chen ◽

...

Keyword(s):

Cooling System ◽

Experimental Assessment ◽

Solar Absorption ◽

Hybrid Cooling

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Effect of Hot Water Setting Temperature on Performance of Solar Absorption-Subcooled Compression Hybrid Cooling Systems

Applied Sciences ◽

10.3390/app10010258 ◽

2019 ◽

Vol 10 (1) ◽

pp. 258 ◽

Cited By ~ 1

Author(s):

Jinfang Zhang ◽

Zeyu Li ◽

Hongkai Chen ◽

Yongrui Xu

Keyword(s):

Cooling System ◽

Hot Water ◽

Operation Performance ◽

Solar Absorption ◽

Point Temperature ◽

Set Point ◽

Cooling Period ◽

High Rise ◽

Hybrid Cooling ◽

The Impact

The solar absorption-subcooled compression hybrid cooling system (SASCHCS) displays outstanding advantages in high-rise buildings. Since the performance coupling of collectors and absorption subsystems is stronger due to the absence of backup heat and the effect of generator setting temperature has not been realized adequately, it is highly important to study the relationship of SASCHCS operation and the set point temperature of hot water to prevent performance deterioration by inappropriate settings. Therefore, the paper mainly deals with the effect of collector and generator setting temperature. The investigation was based on the entire cooling period of a typical high-rise office building in subtropical Guangzhou. The off-design model of hybrid systems was built at first. Subsequently, the impact mechanism of setting temperature in two hot water cycles on facility operation was analyzed. It was found that the excessive rise of collector setting temperature deteriorated the energy saving, while the appropriate improvement of generator set point temperature was beneficial for the solar cooling. Besides, global optimization by the genetic algorithm displayed that 71.6 °C for the collector setting temperature with 64.5 °C for the generator was optimal for annual operation. The paper is helpful in enhancing the operation performance of SASCHCS.

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Performance Simulation of a Solar Powered Vapor Absorption Cooling System

International Journal of Air-Conditioning and Refrigeration ◽

10.1142/s2010132520500261 ◽

2020 ◽

Vol 28 (03) ◽

pp. 2050026

Author(s):

Syed A. M. Said ◽

Hamza K. Mukhtar ◽

M. El Shaarawi ◽

Umro M. Qutub

Keyword(s):

Saudi Arabia ◽

Cooling System ◽

Dynamic Performance ◽

Thermal Inertia ◽

System Capacity ◽

Auxiliary Heating ◽

Solar Absorption ◽

Absorption Cooling ◽

Study Results ◽

Absorption Cooling System

This paper presents the performance of a single effect absorption cooling system under three different climates in Saudi Arabia. The considered system capacity is 10.5[Formula: see text]kW and uses LiBr/water pair. The study results indicated that considering the dynamic response of the cooling cycle significantly increases (close to 30%) the time taken to reach steady-state operations and that the sensitivity of the system to form precipitation of LiBr also increases. Also, the dynamic performance was investigated under different heat inputs and resulted in shorter transient period with increasing the heat input. In addition, the performance of the solar absorption system was investigated for a representative summer day in different climatic regions in Saudi Arabia. The results indicated the requirement of different areas of collectors to meet the absorber heating demand from 09:00 a.m. to 04:00 p.m. if there is no auxiliary heating. Auxiliary heating is required from 04:00 p.m. to 09:00 a.m. Finally, the results indicated that the system performs better in Riyadh city than in Dhahran and Jeddah. This study emphasizes the importance of taking into consideration the thermal inertia of the system components when analyzing the performance of such systems.

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