Performance Evaluation of Photovoltaic Power-Generation System Equipped With a Cooling Device Utilizing Siphonage

2005 ◽  
Vol 128 (2) ◽  
pp. 146-151 ◽  
Author(s):  
Kaoru Furushima ◽  
Yutaka Nawata
Keyword(s):  
Power Generation ◽  
Cooling Water ◽  
Ground Level ◽  
Hot Water ◽  
Generation System ◽  
Cooling Device ◽  
Pv System ◽  
Pv Modules ◽  
Power Generation System ◽  
Hot Water Supply System

In order to construct an efficient photovoltaic (PV) power-generation system, we have developed a new system equipped with a cooling device utilizing siphonage. The major components of the system are an array of PV modules and cooling panels attached to the backside of the PV modules. The PV modules are cooled with cooling water flowing through a narrow gap in each cooling panel, and hot water discharged from the cooling panel can be reused. In order to save energy for introducing cooling water into the panel, siphonage from an upper level of a building to the ground level is utilized. From long-term monitoring tests in summer for the PV system, we confirmed that the cooling of the PV modules increases the electric power and that the reuse of hot water from the cooling panel contributes very much for saving energy consumed in a hot-water-supply system.

Performance Evaluation of Photovoltaic Power-Generation System Equipped With a Cooling Device Utilizing Siphonage

Solar Energy ◽  
2004 ◽  
Author(s):  
Kaoru Furushima ◽  
Yutaka Nawata
Keyword(s):  
Power Generation ◽  
Cooling Water ◽  
Hot Water ◽  
Test Facility ◽  
Generation System ◽  
Cooling Device ◽  
Pv Module ◽  
Pv Modules ◽  
Power Generation System ◽  
Pv Power Generation

Recently, the photovoltaic (PV) power generation system has attracted attention as one of clean energies. Especially, residential roofing PV system connected with power grids has been popularized as a result of increasing concerns over global warming and continuing decline in PV manufacturing costs. The power generated by the PV module increases with irradiance, but it decreases as PV module temperature becomes high. The PV temperature depends on ambient temperature, and becomes more than 60°C in summer. Therefore, the power generated does not necessarily increase even if the irradiance increases in summer. However, if the PV modules were cooled under such a high PV temperature condition, more electrical power would be obtained from PV modules. In this study, a PV power generating system equipped with a cooling device has been developed. The major components of the system are an array of PV modules and cooling panels attached to the backside of the PV modules. The respective PV module is cooled with cooling water flowing through a narrow gap in each cooling panel. Hot water discharged from the cooling panel is delivered to a storage tank and can be reused in anywhere. In order to save energy for introducing cooling water into the panel, a siphonage from an upper level of a building to the ground level is utilized. A siphon tube is connected to a discharge port of the cooling panel, thus the pressure at the discharge port becomes negative. Cooling water enters into the bottom end of the cooling panel at atmospheric pressure and goes up to the top, discharge side. By adopting this cooling water system, we could spread the cooling water evenly over the entire backside of the PV module and thus realized an effective cooling device. In addition, we could make the cooling device light and smaller because no auxiliary pumping system is needed for introducing cooling water. To provide field performance data for the present PV power generation system equipped with the special cooling device mentioned above, long-term monitoring tests in a natural environment were conducted in summer for a test facility constructed at the Yatsushiro National College of Technology (YNCT), Japan. As a result, it was confirmed that the cooling of the PV modules increases the electric power and that the reuse of hot water from the cooling panel contributes very much for saving energy consumed for heating water.

Performance Evaluation of Photovoltaic Power-Generation System Equipped With a Cooling Device Utilizing Siphonage: 2nd Report — Improvement of a PV System Placed on a Residential Rooftop

Solar Energy ◽  
2005 ◽  
Author(s):  
Kaoru Furushima ◽  
Yutaka Nawata ◽  
Michio Sadatomi
Keyword(s):  
Cooling System ◽  
Cooling Water ◽  
Hot Water ◽  
Present System ◽  
Cooling Device ◽  
Pv System ◽  
Pv Module ◽  
Power Generation System ◽  
Pv Cooling

PV modules have a problem that the power generated decreases with the rise of the PV module temperature. In order to solve the problem, we recently developed a new PV cooling device utilizing siphonage. In the first report [1] of this series, we presented the experimental results on the PV mounted on an open rack and that the cooling system is effective in both the improvement of the PV efficiency and the reduction of fuel consumption by reusing hot water from the system. In this study, we conducted long-term monitoring tests on the open rack-mount PV system with a cooling panel behind the PV module and with an insulation board (made of foam polystyrene) behind the cooling panel, simulating the residential rooftop PV system. The data obtained in the experiment have been compared with those obtained for the previous system with the cooling panel but without the insulation board. The comparison shows that the increment in energy production after equipping the cooling panel is much more for the present system with the insulation board irrespective of the cooling start temperature, being the PV temperature when cooling water was started to flow. This result suggests that the installation of the cooling system is more useful for the residential rooftop PV system than the open rack-mount system.

scholarly journals Performance Analysis of a Modernized Z-Source Inverter for Robust Boost Control in Photovoltaic Power Conditioning Systems

Electronics ◽  
2019 ◽  
Vol 8 (2) ◽  
pp. 139 ◽  
Author(s):  
Nafis Subhani ◽  
Ramani Kannan ◽  
Md Mahmud ◽  
Mohd Romlie
Keyword(s):  
Power Generation ◽  
Common Ground ◽  
Single Stage ◽  
Solar Irradiation ◽  
Generation System ◽  
Power Conditioning ◽  
Pv System ◽  
Voltage Stress ◽  
Power Generation System ◽  
Pv Power Generation

In this paper, the performance of a new Z-source inverter (ZSI)-based single-stage power conditioning system (PCS) is analyzed for a standalone photovoltaic (PV) power generation system. The proposed ZSI-based PCS includes two main parts: one is the input from PV units and the other is the ZSI. In this work, a new topology, termed the switched inductor-assisted strong boost ZSI (SL-SBZSI), is introduced for improving the performance of the PCS. The proposed topology shows high boosting capability during the voltage sag in PV units due to variations in solar irradiation and temperature. Another key advantage is the reduced capacitor voltage stress and semiconductor switch voltage stress of the inverter bridge, which ultimately minimizes the size and cost of the single-stage PCS. The proposed ZSI topology falls under the doubly grounded category of inverter by sharing the common ground between the input and output. This is an additional feature that can minimize the leakage current of PV units at the ac output end. The operational principles, detailed mathematical modeling, and characteristics of the proposed SL-SBZSI for a standalone photovoltaic (PV) power generation system is presented in this paper for analyzing performance. The simulation results, which are performed in MATLAB/Simulink, demonstrate the improved performance of the proposed SL-SBZSI for the standalone PV system. The performance of the proposed topology is also evaluated through an experimental validation on a laboratory-based PV system.

System Integration for PEM Fuel Cell With Water and Heat Recovered

2003 ◽  
Author(s):  
Y. Y. Yan ◽  
G. S. Chen ◽  
S. C. Chiang ◽  
H. S. Chu ◽  
F. S. Tsu ◽  
...  
Keyword(s):  
Power Generation ◽  
Fuel Cell ◽  
System Integration ◽  
Waste Heat ◽  
Pem Fuel Cell ◽  
Proton Exchange ◽  
Hot Water ◽  
Water Recovery ◽  
Generation System ◽  
Power Generation System

A 1 kW proton exchange membrane (PEM) fuel cell power system with heat and water recovery was successfully integrated. This power generation system is designed for the stationary application. The waste heat can be recovered into hot water, which store in a tank with temperature higher than 60°C. This hot water may be suitable for bath and kitchen use in a small family. The adjustment for the power generation system is now on going and promoting. Now 38% in the electrical efficiency (AC110V output) for the system is achieved. With waste heat recovery involved, the system will potentially have overall energy efficiency more than 70%. In order to optimize the system, some technologies should be studied and pre-tested before integration work, which mainly included water management for the fuel cell stack, water and thermal conditions on the performance of fuel cell, air and water pumping power needed for the fitting of optimum system performance.

scholarly journals Design and performance analysis of PV grid-tied system with energy storage system

2021 ◽  
Vol 11 (2) ◽  
pp. 1077
Author(s):  
Jerry Kumar ◽  
Nanik Ram Parhyar ◽  
Manoj Kumar Panjwani ◽  
Danish Khan
Keyword(s):  
Power Generation ◽  
Energy Storage ◽  
Storage System ◽  
Energy Storage System ◽  
Generation System ◽  
Pv System ◽  
Power Generation System ◽  
New Challenges ◽  
The Stability ◽  
Pv Grid

With the increasing demand for solar energy as a renewable source has brought up new challenges in the field of energy. However, one of the main advantages of photovoltaic (PV) power generation technology is that it can be directly connected to the grid power generation system and meet the demand of increasing energy consumption. Large-scale PV grid-connected power generation system put forward new challenges on the stability and control of the power grid and the grid-tied photovoltaic system with an energy storage system. To overcome these problems, the PV grid-tied system consisted of 8 kW PV array with energy storage system is designed, and in this system, the battery components can be coupled with the power grid by AC or DC mode. In addition, the feasibility and flexibility of the maximum power point tracking (MPPT) charge controller are verified through the dynamic model built in the residential solar PV system. Through the feasibility verification of the model control mode and the strategy control, the grid-connected PV system combined with reserve battery storage can effectively improve the stability of the system and reduce the cost of power generation. To analyze the performance of the grid-tied system, some real-time simulations are performed with the help of the system advisor model (SAM) that ensures the satisfactory working of the designed PV grid-tied System.

scholarly journals Feasibility of Residential Combined Cooling, Heating, and Power Generation System in Canada

2021 ◽  
Author(s):  
Navid Ekrami
Keyword(s):  
Power Generation ◽  
Waste Heat ◽  
Integrated System ◽  
Hot Water ◽  
Coefficient Of Performance ◽  
Generation System ◽  
Thermally Driven ◽  
Cogeneration System ◽  
Power Generation System ◽  
Charging And Discharging Processes

In order to investigate the feasibility of a combined heating, cooling, and power generation system in the residential sector, an integrated system was designed and installed at the Archetype Sustainable House (ASH) of the Toronto and Region Conservation Authority (TRCA). A Stirling engine based cogeneration unit was used to produce the thermal energy for a thermally driven chiller. The engine supplies hot water up to 95°C. The overall efficiency of up to 90% is determined for the cogeneration system. A thermo-chemical accumulator provided by the ClimateWell AB, was installed and connected to the cogeneration unit. The experimental coefficient of performance (COP) of this chiller during the test period was less than 0.4. Since the ClimateWell chiller rejects heat during both charging and discharging processes, a heat recovery system using three cascade tanks and an outdoor fan coil was designed and installed to utilize the waste heat, for domestic hot water production. A complete TRNSYS model of the tri-generation system was used to verify the experimental results.

Design of a Clamp for a Thermoelectric Generator Using Bimetallic Thermal Properties

2016 ◽  
Author(s):  
Robert Dell ◽  
C. S. Wei ◽  
Nicholas Mitchell ◽  
Runar Unnthorsson
Keyword(s):  
Power Generation ◽  
Thermal Expansion ◽  
Thermoelectric Power ◽  
Coefficient Of Thermal Expansion ◽  
Hot Water ◽  
Leaf Spring ◽  
Generation System ◽  
Thermoelectric Power Generation ◽  
Design Concepts ◽  
Power Generation System

A design team at the Cooper Union for the advancement of Science and Art has developed and patented a robust thermoelectric-based point of use power generation system with no moving parts that is designed to be clamped onto the outer wall of a steam or hot water pipe [1]. Furthermore, in 2013 The Cooper Union for the Advancement of Science received patents for The Bimetallic Leaf Spring and Clamping Device which was designed so that it can compensate for the expected positive expansion and contraction of the thermoelectric power generation system. This paper presents different design concepts evaluated during the development of the clamp and theoretical models for determining the coefficient of thermal expansion of the design concepts. Furthermore, the paper presents experimental results from testing different variations of the selected design concept. Finally, a theoretical thermal expansion model with experimentally obtained parameters is presented. The final clamp design compensates for the expansion and contraction of the thermoelectric power generation system.

Analysis of a 3 kW PEM Fuel Cell Stack Developed by ITRI

2004 ◽  
Author(s):  
M. H. Tsai ◽  
Y. Y. Yan ◽  
H. S. Chu ◽  
R. J. Shyu ◽  
F. Tsau
Keyword(s):  
Power Generation ◽  
Fuel Cell ◽  
Operating Temperature ◽  
Hot Water ◽  
Water Tank ◽  
Water Recovery ◽  
Generation System ◽  
Generation Efficiency ◽  
Fuel Cell Stack ◽  
Power Generation System

A 3kW PEMFC power generation system is developed by Energy and Resources Laboratories in 2002. This system integrates hydrogen storage, fuel reformer, power conversion, hot water tank as well as a 3kW PEMFC stack. The power generation efficiency at 30% and total energy efficiency with hot water recovery at 67% are designed. The stack is key component of this system, and its performance is tested and analyzed before it is integrated into the system. This paper presents its performance in I-V polarization curves with controlling parameters such as fuel cell operating temperature, air humidity, hydrogen humidity and stoichimetric ratio of air. Detailed discussions are given for the effect of each parameter on stack’s performance.

scholarly journals Model predictive control of grid-connected PV power generation system considering optimal MPPT control of PV modules

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Yingying Zhao ◽  
Aimin An ◽  
Yifan Xu ◽  
Qianqian Wang ◽  
Minmin Wang
Keyword(s):  
Power Generation ◽  
Model Predictive Control ◽  
Predictive Control ◽  
Current Control ◽  
Pi Control ◽  
Maximum Output ◽  
Generation System ◽  
Pv Modules ◽  
Power Generation System ◽  
Pv Power Generation

AbstractBecause of system constraints caused by the external environment and grid faults, the conventional maximum power point tracking (MPPT) and inverter control methods of a PV power generation system cannot achieve optimal power output. They can also lead to misjudgments and poor dynamic performance. To address these issues, this paper proposes a new MPPT method of PV modules based on model predictive control (MPC) and a finite control set model predictive current control (FCS-MPCC) of an inverter. Using the identification model of PV arrays, the module-based MPC controller is designed, and maximum output power is achieved by coordinating the optimal combination of spectral wavelength and module temperature. An FCS-MPCC algorithm is then designed to predict the inverter current under different voltage vectors, the optimal voltage vector is selected according to the optimal value function, and the corresponding optimal switching state is applied to power semiconductor devices of the inverter. The MPPT performance of the MPC controller and the responses of the inverter under different constraints are verified, and the steady-state and dynamic control effects of the inverter using FCS-MPCC are compared with the traditional feedforward decoupling PI control in Matlab/Simulink. The results show that MPC has better tracking performance under constraints, and the system has faster and more accurate dynamic response and flexibility than conventional PI control.

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