Simulation and Analysis of Small-Scale Solar Adsorption Cooling System for Cold Climate (original) (raw)
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Environmental Engineering Science, 2013
This article presents a transient model of a solar adsorption cooling system. A computer program has been developed to simulate the operation of a two bed silica gel- water adsorption cooling system as well as flat plate collectors and the hot water storage tank. This program is then utilized to simulate the performance of a sample solar adsorption cooling system used for cooling a set of rooms that comprises an area of 52 m2 located in Ahwaz city in Iran. The system has been simulated with typical weather data of solar radiation and ambient temperatures of Ahwaz. The results include the temperature profiles of hot, cooling and chilled water in addition to Temperature profiles of adsorption/desorption beds, evaporator and condenser. Also the effects of the cycle time, switching time and hot water temperature on COP and refrigeration capacity are studied. Furthermore, the effects of solar collectors’ surface area and the storage tank volume on total cost of the system are investigate...
Performance Analysis of Solar Adsorption Cooling System-Effect of Position of Heat Storage Tank
2016
An insulated storage tank has been added with adsorption cooling system run by solar heat collected by CPC panel. It has been expected and seen that the storage tank has a vital contribution in the performance of the chiller. The storage tank is connected with a solar heat driven single stage two bed basic adsorption chillers activated with silica gel-water pair in two ways. The tank is connected in such a way that (i) the solar collectors supply hot water to the desorption bed, the outflow of the desorber is collected in the reserve tank. The reserve tank supplies water to the collector and complete the heat transfer cycle. (ii) The solar collector supply hot water which is collected in the storage tank first and then supplied to the desorber. The outflow of the desorber is carried to the collector again. Comparative studies have been conducted at the steady state for both of the systems with heat storage. It has been observed that the system is robust with design (i) while with de...
Performance of a small-scale solar-powered adsorption cooling system
International Journal of Green Energy, 2017
The aim of this study is to identify the optimal design parameters of a fully solar-powered adsorption cooling system for residential buildings located in hot arid areas. The proposed system consists of solar collectors, hot water tank, watersilica gel adsorption chiller of 8 kW cooling capacity, cold water tank, fan coil unit, and cooling tower. An optimization based on computer simulation has been conducted for achieving the aim of this study. The proposed system was applied to Assiut, Egypt as a case study. The optimization shows that the optimal design parameters of the proposed system are as follows: 58 m 2 solar collecting area, 5.5 m 3 hot water tank and 1 m 3 cold water tank. The simulation of the proposed system with the optimal design parameters during the design day shows that the chilled water temperature leaving the chiller is between 17 and 18 °C with high cooling water temperature of 34.5 °C. This makes the system unable to achieve the indoor thermal design conditions. However, the system is able to meet the cooling demand in most days of the cooling season except for about 9.15% representing extreme hot days. The simulation also shows that during the design day, the proposed system achieves daily solar collecting efficiency of 56% and can produce chilling energy of 113.3 kWh with 7.35 kW energy rate and daily COP of 0.41. In addition, the cold water tank enables the system to extend the operation period for 110 min after switching off the chiller.
SN Applied Sciences, 2019
The aim of this study is to identify the optimal design parameters of a fully solar-powered adsorption cooling system for residential buildings located in hot arid areas. The proposed system consists of solar collectors, hot water tank, watersilica gel adsorption chiller of 8 kW cooling capacity, cold water tank, fan coil unit, and cooling tower. An optimization based on computer simulation has been conducted for achieving the aim of this study. The proposed system was applied to Assiut, Egypt as a case study. The optimization shows that the optimal design parameters of the proposed system are as follows: 58 m 2 solar collecting area, 5.5 m 3 hot water tank and 1 m 3 cold water tank. The simulation of the proposed system with the optimal design parameters during the design day shows that the chilled water temperature leaving the chiller is between 17 and 18 °C with high cooling water temperature of 34.5 °C. This makes the system unable to achieve the indoor thermal design conditions. However, the system is able to meet the cooling demand in most days of the cooling season except for about 9.15% representing extreme hot days. The simulation also shows that during the design day, the proposed system achieves daily solar collecting efficiency of 56% and can produce chilling energy of 113.3 kWh with 7.35 kW energy rate and daily COP of 0.41. In addition, the cold water tank enables the system to extend the operation period for 110 min after switching off the chiller.
Applied Energy, 2010
This study presents a design and performance analysis of a point-focus parabolic solar still (PPSS) during seven sunny, relative cloudy and dusty days in October. The variations of hourly and daily production rates were investigated by studying the effect of environmental and operational parameters composed of beam solar insolation, wind speed, air temperature, absorber temperature, preheating and salt concentration of raw water. The results indicated that the most effective parameter is available solar insolation and absorber temperature, as the most average daily production rate of 5.12 −1 was obtained on the day with the average solar insolation of 626.8 −2 and the average absorber temperature of 150.7℃. Whereas no significant effect of the air temperature and salt concentration of raw water was obtained. This means that the acceptable performance rate would be achieved by the solar still with high levels of solar insolation even in in cold and windy days. Based on the performance evaluation, the daily productivity of freshwater was increased up to 13% by preheating of raw water. The average daily efficiency of the still was calculated as 34.69% with the maximum hourly productivity of 1.5 ℎ −1 . The quality of distillate from the still was analyzed to verify the ability of the still to meet the standards required for drinking water.
Solar heat utilization for adsorption cooling device
EPJ Web of Conferences, 2012
This article deals with possibility of solar system connection with adsorption cooling system. Waste heat from solar collectors in summer is possible to utilize in adsorption cooling systems, which desorption temperatures have to be lower than temperature of heat transport medium operation temperature. For verification of work of this system was constructed on the Department of power engineering on University of Zilina solar adsorption cooling device. Solar equipment is used in the summer periods only partially for hot water, whereas is the lowest heat demand for heating, while solar collectors heat profits are currently the highest at this time. Therefore rises the idea of using this excess heat for cooling, because in summer is highest consumption of energy for cooling.
Solar Adsorption Cooling: A Case Study on the Climatic
2013
An analytical investigation has been conducted on the performance of an adsorption chiller driven by solar collector panel for the climatic condition of Dhaka. A set of mathematical model and simulation technique are exploited to investigate the system performances of solar driven basic adsorption chiller with silica gel-water as adsorbent/adsorbate pair. For base run condition, at least 13 collectors (each of area 2.415 2 m) are essential to achieve the required heat source temperature (around 85° C) to provide 10 kW cooling capacity. It is seen that the chiller provide 10kw cooling capacity at noon, while, the system provides solar COP around 0.35. It is also observed that the collector size can be reduced by optimizing cycle time and chilled water outlet temperature can be controlled by setting an appropriate chilled water flow rate.
Energies, 2022
In hot and dry regions such as the Gulf Cooperation Council (GCC) countries, the cooling demand is often responsible for more than 70% of electricity consumption, which places a massive strain on the electricity grid and leads to significant emissions. Solar thermal driven Silica-Gel/Water adsorption chillers, used for space cooling, could provide low carbon emission cooling and reduce the reliance on grid electricity. However, a meticulous design is required to make this both economically and environmentally beneficial. This paper aims to evaluate the solar thermal adsorption chiller performance based on large-scale cooling demand through a TRNSYS simulation for 1 year of operation. The proposed system consists of two main parts: first, the solar loop with evacuated tube solar collectors; and second, the adsorption cooling system with a silica-gel/water adsorption chiller. A neighbourhood of 80 typical 197 m2 villas in Riyadh, the capital city of the Kingdom of Saudi Arabia (KSA), ...
Global Journal of Energy Technology Research Updates, 2015
Solar airconditioning (AC) is a sustainable airconditioning system but a backup heater is needed because a solar AC has intermittent output. This study presents the effect of ratio of heat delivered by solar to the total heat delivered to an adsorption chiller (solar fraction) on the environmental performance of a solar AC system. This AC system need covers cooling demand for an office building in Malaysia. Cooling demand of the building was simulated using well-known building energy analysis software, Equest. Flat-plate collectors and an adsorption chiller were the main component of the solar AC system. Flat-plate collecters were simulated using another software, Watsun, and the adsorption chiller was based on the author simulation model that is comparable with other studies. Environmental performance was analyzed by emission ratio of a boiler and power plants. Solar fraction of 0.33, 0.74 and 0.98 were studied. It was found that solar AC by an adsorption chiller can cover the cooling demand of the office building throughout the year. It was also found that a gas fired boiler is a better auxiliary heater than an electric heater because of the direct conversion of heat from fuel. Less emissions is emited at higher SF compared to conventional AC for all cases of backup heater. A solar AC must has solar fraction higher than 74% to ensure it emits less emissions than a conventional AC system.