scholarly journals The Functioning of The Hybrid Integrated Partially Solar-Vapor-Compression Fridge

2021 ◽  
Vol 16 ◽  
pp. 141-157
Author(s):  
Mohammad Awwad Ali Al-Dabbas
Keyword(s):  
Solar Collector ◽  
Capillary Tube ◽  
Photovoltaic System ◽  
Vapor Compression ◽  
Solar Thermal Energy ◽  
Night Time ◽  
Collector System ◽  
Different Temperatures ◽  
The Difference ◽  
Flat Plate Solar Collector

The main purpose of our research is to increase the utilization of solar thermal energy to supply a refrigerator with vapor compression and reduce the refrigeration power needed for cooling. Combined Hybrid Solar - the vapor- compression refrigerating unit has been built and operates under Mutah University's environment in Jordan. The systems were made up of a capillary tube, condenser, evaporator, and collector. The vapor-pressure refrigerator was incorporated with the classic water-solar system to minimize the compressor's duty and to reduce power consumption in heating the amount of water held in the pipe to be sent along the tube outside the evaporator. After that, it will be returned to the compressor, But at a lesser temperature, to minimize compressor workload and enhance cooling performance. Before the compressor was developed, a solar collector system had been created to maximize its temperature before reaching the compressor to improve C.O.P, and the difference in temperature was remarkable. The vapor-compression refrigerator unit was powered by many generators: solar collector that has been discharged, photovoltaic system, flat plate solar collector. Two groups of tests have been performed experimentally on the partial solar compression refrigerator integrated into a hybrid system. First in the vapor compression refrigerator only, and the second in the Hybrid solar compression refrigerator incorporated. Total sunlight and different temperatures, current, and voltage were measured for many months each hour of the day. The performance coefficient was determined found 2.019, 2.432 respectively. Many auxiliary instruments are utilized to measure the temperature in irradiation networks, voltage, and night-time current every hour.

Solar Water Heater Design for Houses in Arid Zones

2013 ◽  
Author(s):  
Ramses Vega ◽  
Hector E. Campbell ◽  
Juan de Dios Ocampo ◽  
Diego R. Bonilla G.
Keyword(s):  
Solar Collector ◽  
Extreme Temperature ◽  
Hot Water ◽  
Arid Zones ◽  
Water Heater ◽  
Collector System ◽  
End Use ◽  
Flat Plate Solar Collector ◽  
Demand Profile ◽  
Heater Design

This paper shows the simulation and design of a flat plate solar collector system, used to feed hot water to a typical home located in the city of Mexicali, Baja California, México. The system consists of a solar collector, a storage tank, a water pump and accessories and special tools that allow its proper operation. Analyzing the consumption and end use of water in a typical House, a demand profile is established, which combined with the weather information of the region, constitutes the input parameters required for the simulation of the system, which is performed with the software package TRNSYS. Mexicali, due to its location (latitude 32 °, longitude 114 °) and semi-desert condition presents high temperatures in the summer and low in winter, so the design and operation of such systems require special features, not always considered in the conventional ratings. This paper presents methods for simulation and design oriented to optimize the dimensioning and operation of this type of solar heaters in regions with extreme temperature conditions.

SIMULATION STUDY ON ENHANCING HYDROGEN PRODUCTION IN AN OCEAN THERMAL ENERGY (OTEC) SYSTEM UTILIZING A SOLAR COLLECTOR

2015 ◽  
Vol 77 (1) ◽  
Author(s):  
Amyra MY ◽  
Nor'azizi Othman ◽  
Shamsul Sarip ◽  
Yasuyuki Ikegami ◽  
Mohd Alshafiq Tambi Chik ◽  
...  
Keyword(s):  
Thermal Energy ◽  
Simulation Study ◽  
Solar Collector ◽  
Hydrogen Generation ◽  
Thermodynamic Efficiency ◽  
Control Parameters ◽  
Solar Thermal Energy ◽  
Flat Plate Solar Collector ◽  
Ocean Thermal Energy ◽  
Net Power Output

This article reports the simulation study on the performance of utilizing a solar collector at the inlet of an evaporator to provide auxiliary heat into a system for hydrogen generation in an OTEC cycle. The conventional method of OTEC is simulated by FORTRAN programming and the results were compared with the presence of solar collector on the system. In the simulation experimental, the incoming temperature of warm seawater was boosted by using a flat plate solar collector. For the purpose of the experiment, a 100 kW OTEC cycle that was designed incorporated a solar boosting capability. Its thermodynamic efficiency was then compared through a series of simulation involving several control parameters. The results reveal that the proposed solar boosted OTEC enhanced the thermal efficiency, TE. Increase in solar power absorption can increase the net power output, thus increasing the amount of hydrogen produced. The results obtained provided insights, from a thermodynamic perspective, on the outcome of combining sustainable energy with solar thermal energy to improve the system performance.

Potential of Size Reduction of Flat-Plate Solar Collectors when Applying Al2O3 Nanofluid

2013 ◽  
Vol 832 ◽  
pp. 149-153 ◽  
Author(s):  
Mohd Faizal ◽  
Rahman Saidur ◽  
Saad Mekhilef ◽  
M Faizal
Keyword(s):  
Thermal Conductivity ◽  
Flat Plate ◽  
Solar Collector ◽  
Fossil Fuel ◽  
Size Reduction ◽  
Solar Thermal Energy ◽  
Absorbing Medium ◽  
Renewable Source ◽  
Original Size ◽  
Flat Plate Solar Collector

The source of fossil fuel is decreasing. The price increased rapidly. Population and demand of energy increased significantly over the years. Carbon pollution and global warming are becoming major issues. The best way to overcome this problem is by changing to renewable source of energy. One of it is solar thermal energy. However, a solar technology is currently still expensive, low in efficiency and takes up a lot of space. Nanofluid is recognized as a solution to overcome this problem. Due to the high thermal conductivity of nanofluids, the thermal efficiency of a solar collector can be increased and thus decreasing the size of the system. This paper analyzes the efficiency of using the Al2O3nanofluid as absorbing medium in flat-plate solar collector and estimated the potential of size reduction. When applying the same output temperature of Al2O3nanofluid as with water, it can be observed that the collectors size can be reduced up to 24% of its original size.

scholarly journals The viscosity of carbon dioxide

1912 ◽  
Vol 87 (592) ◽  
pp. 48-61 ◽  
Keyword(s):  
Carbon Dioxide ◽  
Critical Temperature ◽  
Continuous Flow ◽  
Critical Pressure ◽  
Capillary Tube ◽  
Saturated Vapour ◽  
Different Temperatures ◽  
Temperature And Pressure ◽  
The Difference ◽  
Continuous Flow Method

The viscosity of carbon dioxide was determined under considerable variation of temperature and pressure by Warburg and Babo* in 1882, but their results are rather incomplete. They determined a few viscosity pressure isothermals at temperatures above the critical temperature, one such isothermal for the liquid at 25° C., and a few values of the viscosity of the liquid under the pressure of its saturated vapour at different temperatures. Recently E. N. da C. Andrade, working at University College, began to determine the viscosity of carbon dioxide at different temperatures under the critical pressure by a continuous flow method. This involved the use of large quantities of CO 2 , which he obtained in the usual trade cylinders, and which he kept at the critical pressure by immersing the cylinder in a bath at the critical temperature. The cylinder communicated with the capillary tube, which was surrounded by water at any desired temperature, and through which the CO 2 was slowly allowed to escape into weighed potash bulbs. The mass of CO 2 absorbed in a certain time gave the quantity of CO 2 flowing through the capillary tube per second, and a manometer gave the difference of pressure at the two ends of the capillary. The weakest point in the method was the use of CO 2 from the ordinary cylinders, for it contains a considerable amount of moisture, which has a large effect on the viscosity, especially near the critical point.

Study on the PCM flat-plate solar collector system with antifreeze characteristics

2019 ◽  
Vol 129 ◽  
pp. 357-366 ◽  
Author(s):  
Fan Zhou ◽  
Jie Ji ◽  
Weiqi Yuan ◽  
Xudong Zhao ◽  
Shengjuan Huang
Keyword(s):  
Flat Plate ◽  
Solar Collector ◽  
Collector System ◽  
Flat Plate Solar Collector
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