scholarly journals Increasing photovoltaic panel power through water cooling technique

2017 ◽  
Vol 2 (1) ◽  
Author(s):  
Calebe Abrenhosa Matias ◽  
Licínio M. Santos ◽  
Aylton J. Alves ◽  
Wesley P. Calixto
Keyword(s):  
Water Flow ◽  
Cooling System ◽  
Water Flow Rate ◽  
Front Surface ◽  
Climatic Conditions ◽  
Net Energy ◽  
Water Cooling ◽  
Photovoltaic Panel ◽  
Reuse Water ◽  
Pv Panel

This paper presents the development of a cooling apparatus using water in a commercial photovoltaic panel in order to analyze the increased efficiency through decreased operating temperature. The system enables the application of reuse water flow, at ambient temperature, on the front surface of PV panel and is composed of an inclined plane support, a perforated aluminum profile and a water gutter. A luminaire was specially developed to simulate the solar radiation over the module under test in a closed room, free from the influence of external climatic conditions, to carry out the repetition of the experiment in controlled situations. The panel was submitted to different rates of water flow. The best water flow rate was of 0.6 L/min and net energy of 77.41Wh. Gain of 22.69% compared to the panel without the cooling system.

scholarly journals Experimental investigations of spray flow rate and angle in enhancing the performance of PV panels by steady and pulsating water spray system

2021 ◽  
Vol 3 (1) ◽  
Author(s):  
Mojtaba Nateqi ◽  
Mehran Rajabi Zargarabadi ◽  
Roohollah Rafee
Keyword(s):  
Cooling System ◽  
Spray Cooling ◽  
Spray Angle ◽  
Experimental Investigations ◽  
Water Spray ◽  
Maximum Increase ◽  
Photovoltaic Panel ◽  
Electrical Efficiency ◽  
Spray System ◽  
Pv Panel

AbstractIn this study, a spray cooling system is experimentally investigated to increase the photovoltaic panel efficiency. Cooling of photovoltaic panels is one of the important parameters that affects the PV panel performance. In this experiment the effects of spray angle, nozzles to PV panel distance, number of nozzles, and pulsating water spray on the PV panel performance are investigated. For this purpose, an experimental setup was made. The spray angles varied from 15° to 50°. The comparison between the spray angles shows that by decreasing the spray angle to 15° increases the electrical efficiency of PV panel to 19.78% and simultaneously the average PV panel temperature decreases from 64 (for non-cooled PV) to 24 °C. Also, nozzle to PV panel distance was changed from 10 to 50 cm. The best result was obtained for the lowest distance by 25.86% increase in power output. Study of various frequency also show that due to the surface evaporation and the intensity of the radiation, increasing the water spraying frequency can increase or decrease the electrical efficiency. The On–Off water spray system results show that the maximum increase in efficiency was obtained with frequency of 0.2 Hz which it was 16.84%. Water consumption also decreased to half.

scholarly journals Numerical and Experimental Study on Energy Performance of Photovoltaic-Heat Pipe Solar Collector in Northern China

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Hongbing Chen ◽  
Xilin Chen ◽  
Sai Chu ◽  
Lei Zhang ◽  
Yaxuan Xiong
Keyword(s):  
Heat Pipe ◽  
Water Flow ◽  
Thermal Efficiency ◽  
Solar Collector ◽  
Water Flow Rate ◽  
Northern China ◽  
Energy Performance ◽  
Good Choice ◽  
Water Type ◽  
Pv Panel

Several studies have found that the decrease of photovoltaic (PV) cell temperature would increase the solar-to-electricity conversion efficiency. Water type PV/thermal (PV/T) system was a good choice but it could become freezing in cold areas of Northern China. This paper proposed a simple combination of common-used PV panel and heat pipe, called PV-heat pipe (PV-HP) solar collector, for both electrical and thermal energy generation. A simplified one-dimensional steady state model was developed to study the electrical and thermal performance of the PV-HP solar collector under different solar radiations, water flow rates, and water temperatures at the inlet of manifold. A testing rig was conducted to verify the model and the testing data matched very well with the simulation values. The results indicated that the thermal efficiency could be minus in the afternoon. The thermal and electrical efficiencies decreased linearly as the inlet water temperature and water flow rate increased. The thermal efficiency increased while the electrical efficiency decreased linearly as the solar radiation increased.

Estimation of Optimal Water Flow Rate of a Steel Roller Shutter with Water Film Cooling System

2014 ◽  
Vol 905 ◽  
pp. 263-267
Author(s):  
Shin Ku Lee ◽  
W.H. Lo ◽  
M.C. Ho ◽  
T.H. Lin
Keyword(s):  
Water Flow ◽  
Flow Rate ◽  
Film Cooling ◽  
Inverse Method ◽  
Cooling System ◽  
Water Flow Rate ◽  
Water Film ◽  
Steel Roller ◽  
Fire Environment ◽  
Hot Surface

The hybrid inverse method to estimate the optimal water flow rate and surface temperature on the hot surface of the steel roller shutter with water film cooling system subjected to a fire environment is presented in this paper. The results show that the effect of the down-flowing water film flow rate on the present estimates cannot be negligible. The water-film system combined with the steel roller shutter can effectively improve the heat resistance and the temperature of the shutter slat surface can be controlled to around 100 °C. The optimal water flow rate is 110 L/min for a typical 3m x 3m steel roller shutter with water film cooling system.

Efficiency Enhancement of Photovoltaic/Thermal Module Using Front Surface Cooling Technique in Winter and Summer Seasons: An Experimental Investigation

2019 ◽  
Vol 141 (9) ◽  
Author(s):  
Himanshu Sainthiya ◽  
Narendra S. Beniwal
Keyword(s):  
Solar Cell ◽  
Surface Water ◽  
Surface Temperature ◽  
Front Surface ◽  
Climatic Conditions ◽  
Back Surface ◽  
Water Cooling ◽  
Performance Parameters ◽  
Surface Cooling ◽  
Overall Efficiency

This paper presents the effect of the front surface water cooling on performance parameters (solar cell temperature, back surface temperature, outlet water temperature, electrical efficiency, overall efficiency, etc.) of photovoltaic/thermal (PV/T) module in both winter and summer seasons in Indian climatic conditions. A mathematical model of PV/T module considering energy balance equations has also been presented. A comparative analysis of performance parameters obtained analytically and experimentally has also been presented. A fair agreement has also been found between analytical and experimental results which is supported by correlation coefficient of approximately unity and root mean square error of 10–14%. By front surface water cooling, solar cell and back surface temperature of PV/T module have been found to decrease considerably which in turn resulted in enhanced electrical and overall efficiency of module in winter and summer seasons.

Performance Study of an Oil-Immersed Power Transformer With Shallow Geothermal Cooling

2015 ◽  
Vol 8 (2) ◽  
Author(s):  
Gerd Schmid ◽  
Chien-Yeh Hsu ◽  
Yu-Ting Chen ◽  
Tai-Her Yang ◽  
Sih-Li Chen
Keyword(s):  
Experimental Data ◽  
Thermal Analysis ◽  
Heat Exchanger ◽  
Water Flow ◽  
Cooling System ◽  
Flow Direction ◽  
Water Flow Rate ◽  
Transformer Oil ◽  
Performance Study ◽  
Cooling Performance

This paper investigates the cooling performance of a shallow geothermal energy method in relation to the cooling system of a 75 kVA oil-immersed transformer. A thermal analysis of the complete system is presented and then validated with experimental data. The cooling performance of the shallow geothermal cooling method is indicated by its cooling capacity and average oil temperature. The results of this study show that the average oil temperature can be reduced by nearly 30 °C with the aid of an 8 m deep U-pipe borehole heat exchanger, thereby making it possible to increase the capacity of the transformer. By increasing the water flow rate from 6 L/m to 15 L/m, the average oil temperature could be lowered by 3 °C. In addition, the effects of changing the circulating water flow direction and the activation time of the shallow geothermal cooling system were investigated. The results of the thermal analysis are consistent with the experimental data, with relative errors below 8%. The results of the study confirm that a larger temperature difference between the cooling water and the transformer oil at the inlet of the heat exchanger can increase the overall heat transfer rate and enhance the cooling performance of the shallow geothermal cooling system.

Theoretical Study and Mathematical Modeling of Plate-Pin Fin Heat Exchanger for Solar Photovoltaic Cooling System

2014 ◽  
Vol 984-985 ◽  
pp. 1138-1146
Author(s):  
R. Vijaykumar ◽  
T. Mukesh ◽  
R. Rudramoorthy
Keyword(s):  
Heat Exchanger ◽  
Cooling System ◽  
Production Capacity ◽  
Climatic Conditions ◽  
Air Cooling ◽  
Solar Photovoltaic ◽  
Water Cooling ◽  
Solar Pv ◽  
Pv System ◽  
Pin Fin

Solar photovoltaic (PV) plays a major role in the renewable energy sector in the field of power production. Production of electricity from solar PV is gaining rapid importance due to its cleaner energy production capacity and it’s adaptability to various climatic conditions. PV cells suffer noticeable drop in efficiency as their operating temperature increases beyond a certain limit. In such cases cooling of the PV cells becomes mandatory. Since the efficiencies of PV cells are in the lower range (a maximum of 18%), a highly effective, inexpensive cooling system is necessary to be employed. Air cooling provides a solution to this cause and is meant to be an better counterpart to water cooling since it overcomes the problems of water cooling such as silt formation, evaporation, soiling and reflection losses. This paper presents a simple mathematical PV/T model to design the cooling system using plate-pin fin extended surface heat exchanger model. A relationship between the heat dissipated and the number of fins along with its dependence on individual fin area is also developed. This model will provide the researchers to design their cooling system according to their PV system geometry.

Using a Multiport Pitot Tube in Circulating Water Flow Measurements

2007 ◽  
Author(s):  
Luis R. Figueroa Ibarra ◽  
J. Hugo Rodri´guez Marti´nez ◽  
Marcelino Santaba´rbara Botello
Keyword(s):  
Water Flow ◽  
Flow Rate ◽  
Cooling System ◽  
Thermal Power ◽  
Water Flow Rate ◽  
Pitot Tube ◽  
Flow Measurements ◽  
Circulating Water ◽  
Measurement Results ◽  
Made In

This paper details the design of a Pitot tube used for water flow rate measurements in large pipes. The paper describes first the nowadays commonly used device (simplex pitot), based on standard CTI Code ATC-105 from Cooling Tower Institute [1]. The disadvantages of the simplex pitot are pointed out, and the detailed description of the proposed device (multiport pitot) is explained. The Multiport Pitot, which design is also based on norm ATC-105, is able to perform real-time measurements. The paper also includes the results obtained from the water flow rate measurements made in the cooling system of a thermal power plant in Mexico. These measurement results were compared to simulation results obtained with a computational commercial simulation tool.

Numerical and Experimental Analysis on High Power Density Multi-Fuel Rotary Engine Heat Redistribution Optimization Design

2017 ◽  
Author(s):  
Wenwei Zeng ◽  
Shawn Okun
Keyword(s):  
Water Flow ◽  
Hot Spots ◽  
Optimization Design ◽  
Cooling System ◽  
Water Cooling ◽  
Cold Side ◽  
Rotary Engine ◽  
Rotary Engines ◽  
Current Water ◽  
Water Cooling System

A revolutionary cooling system is designed for a multi-fuel rotary engine (200 cc, 40 hp). The patented cooling system includes a water cooled array of engine housings, an innovative rotor and hydrodynamic bearings set cooled with a secondary oil cooling system. The oil conduits, however, are incorporated into water jackets, therefore the heat is further transferred to the water flow. Numerous fins and ribs are utilized as deflectors in water jackets thus controlling water flow to carry heat from the “hot” side of the engine housing to the “cold” side, which minimize temperature differential over the housing as well as reducing peak temperature. Numerical simulation indicated hot spots and uneven temperature distribution issues were controlled in the water jackets. Testing the optimized water jackets as part of the cooling system was also shown in successful in controlling temperature, hot spots and cavitation on the rotary engine with multi-fuels testing, such as kerosene, JP-5, JP-8, alcohol, gasoline, and E85. The potential of applying current water cooling system in other rotary engines is feasible.

scholarly journals Controlling the Distribution of Cold Water in Air Cooling Systems of Underground Mines

2016 ◽  
Vol 61 (4) ◽  
pp. 793-807 ◽  
Author(s):  
Nikodem Szlązak ◽  
Dariusz Obracaj ◽  
Justyna Swolkień ◽  
Kazimierz Piergies
Keyword(s):  
Automatic Control ◽  
Water Flow ◽  
Flow Rate ◽  
Cold Water ◽  
Cooling System ◽  
Water Flow Rate ◽  
Underground Mines ◽  
Air Cooling ◽  
Cooling Systems ◽  
Pipeline Network

Abstract In Polish underground mines in which excavations are subjected to high heat load, central and group cooling systems based on indirect cooling units are implemented. Chilled water, referred to as cold water and produced in chillers, is distributed through a pipeline network to air coolers located in mining and development districts. The coolers are often moved to other locations and the pipeline network undergoes constant modification. In such a system, parameters of cold water in different branches of the pipeline network need to be controlled. The article presents the principles for controlling the cooling capacity of air coolers installed in an underground mine. Also, the authors propose automatic control of water flow rate in underground pipeline network and in particular coolers, depending on the temporary cooling load in the system. The principles of such a system, controlling cold water distribution, and the functions of its individual components are described. Finally, an example of an automatic control of water flow rate in a central cooling system currently implemented in a mine is presented.

Sign in / Sign up

Export Citation Format

Share Document