Numerical analysis of a multi-channel active cooling system for densely packed concentrating photovoltaic cells

To seek the fan operating point on a cooling system with fans, it is very important to determine the system impedance curve and it has been usually examined with the fan tester based on ASHRAE standard and AMCA standard. This leads to a large investment in time and cost, because it could not be executed until the system is made actually. Therefore it is necessary to predict the system impedance curve through numerical analysis so that we could reduce the measurement time and effort. This paper presents how the system impedance curve (pressure drop curve) is computed by CFD in substitute for experiment. In reverse order to the experimental principle of the fan tester, pressure difference was adopted first as inlet and outlet boundary conditions of the system and then flow rate was calculated. After determining the system impedance curve, it was compared with experimental results. Also the computational domain of the system was investigated to minimize computational time.

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Modeling a Passive Cooling System for Photovoltaic Cells Under Concentration

ASME/JSME 2007 Thermal Engineering Heat Transfer Summer Conference, Volume 2 ◽

10.1115/ht2007-32693 ◽

2007 ◽

Cited By ~ 9

Author(s):

Allison Gray ◽

Robert Boehm ◽

Kenneth W. Stone

Keyword(s):

Solar Irradiance ◽

Waste Heat ◽

Cooling System ◽

Photovoltaic Cells ◽

Theoretical Data ◽

Photovoltaic System ◽

Passive Cooling ◽

Cell Temperature ◽

Worst Case ◽

Passive Cooling System

Cooling of photovoltaic cells under high intensity solar irradiance is a major concern when designing concentrating photovoltaic systems. The cell temperature will increase if the waste heat is not removed and the cell voltage/power will decrease with increasing cell temperature. This paper presents an analysis of the passive cooling system on the Amonix high concentration photovoltaic system (HCPV). The concentrator geometry is described. A model of the HCPV passive cooling system was made using Gambit. Assumptions are discussed that were made to create the numerical model based on the actual system, the methods for drawing the model is discussed, and images of the model are shown. Fluent was used to compute the numerical results. In addition to the theoretical results that were computed, measurements were made on a system in the field. These data are compared to the theoretical data and differences are calculated. Theoretical conditions that were studied included uniform cell temperatures and worst case weather scenarios, i.e., no wind, high ambient conditions, and high solar irradiance. The performance of the Amonix high concentrating system could be improved if more waste heat were removed from the cell. Now that a theoretical model has been developed and verified, it will be used to investigate different designs and material for increasing the cooling of the system.

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Active cooling photovoltaic with IoT facility

International Journal of Power Electronics and Drive Systems (IJPEDS) ◽

10.11591/ijpeds.v12.i3.pp1494-1504 ◽

2021 ◽

Vol 12 (3) ◽

pp. 1494

Author(s):

Muhammad Nizam Kamarudin ◽

Sahazati Md. Rozali ◽

Mohd Saifuzam Jamri

Keyword(s):

Real Time ◽

Cooling System ◽

Solar Panel ◽

State Of Charge ◽

Photovoltaic System ◽

Passive Cooling ◽

Active Cooling ◽

Passive Cooling System ◽

Pv Power Generation ◽

Sunlight Intensity

Harvesting energy from the sun makes the photovoltaic (PV) power generation a promising technology. To obtain a consistent state of charge (SOC), consistent energy must be harvested and efficiently directed to the battery. Overcharging or undercharging phenomena decreases the lifetime of the battery. Besides, the effect of irradiance toward solar in term of sunlight intensity effects the efficiency and hence, sluggish the SOC. The main problem of the solar panel revealed when the temperature has increased, the efficiency of solar panel will also be decreased. This manuscript reports the finding of developing an automatic active cooling system for a solar panel with a real time energy monitoring system with internet-of-things (IoT) facility. The IoT technology assists user to measure the efficiency of the solar panel and SOC of the battery in real time from any locations. The automatic active cooling system is designed to improve the efficiency of the solar panel. The effectiveness of the proposed system is proven via the analysis of the effect of active cooling toward efficiency and SOC of photovoltaic system. The results also tabulate the comparative studies of active-to-passive cooling system, as well as the effect of cooling towards SOC and efficiency of the solar panel.

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Active cooling system for downhole electronics in high temperature environments

Journal of Thermal Science and Engineering Applications ◽

10.1115/1.4053120 ◽

2021 ◽

pp. 1-16

Author(s):

Wei Minghui ◽

Cai Wei ◽

Xu Mingze ◽

Deng Shuang

Keyword(s):

High Temperature ◽

Cooling System ◽

Capillary Tube ◽

Thermal Characteristics ◽

Electric Circuit ◽

Passive Cooling ◽

Electronic Components ◽

Active Cooling ◽

Temperature Environment ◽

High Temperature Environment

Abstract Downhole high temperature environment is an important factor affecting the performance of downhole instrument electronic system.At present, various active cooling technologies and passive cooling technologies have been proposed to reduce the temperature of downhole electric circuit system.However, passive cooling technologies can only provide limited cooling capacity for drilling tools under high temperature environment, and the duration of cooling is short, which can not meet the long-time drilling task.This paper presents an Active cooling system(ACS)for downhole electronics and the effects of different temperatures on the performance of electronic components are analyzed.The ACS mainly includes a micro supercharger, condenser tube, evaporation pipe, capillary tube and refrigerant.The theoretical analysis of heat transfer and refrigerant capacity in high temperature environment is carried out.The thermal characteristics of the ACS is evaluated experimentally.The results show that the temperature of electronic components can be reduced to below 163°C in the 200°C downhole environment and components.The geomagnetic field data measured by electronic components at room temperature, 200 °C and with ACS are compared.The results show that ACS can keep electronic components working normally.

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