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With the recent decreasing trend in solar PV module pricing, this work evokes a development of 3-tier solar PV drying chamber with multiple heater combination for heat dissipation effect. The temperature performance are measured based on 360 Wp and 540 Wp DC power supply. The construction of the PV dryer is designed with 0.66 m × 0.66 m × 0.8 m dimension, comprising three trays with an effective area...
In this experimental study two solar technologies concentration and the flat plate collector were combined in one solar air heater with a Linear Fresnel Reflector (SAHLFR). A rectangular useful duct with 2.32 [m] length and 0.2 [m] width is equipped with and without artificial roughness. This roughness has wrought of steel galvanized 0.4 [mm] thickness to create a turbulent flow of air and ensure...
This paper presents an output feedback control for distributed parabolic solar collectors. The controller aims at forcing the outlet temperature to track a desired reference in order to manage the produced heat despite the external disturbances. The proposed control strategy is derived using the distributed physical model of the system to avoid the loss of information due to model approximation schemes...
Energy in various forms has played an increasingly important role in world-wide economic progress and industrialization. Sunlight available freely as a direct and perennial source of energy provides a non-polluting reservoir of fuel. The simplest and the most efficient ways to utilize solar energy are to convert it into thermal energy for heating applications by using solar collectors. The thermal...
Solar air heaters form the major component of solar energy utilization systems which absorb the incoming solar radiation, converting it into thermal energy at the absorbing surface, and transferring the energy to a fluid flowing through the collector. This paper presents the outline of an experimental investigation of the performance of a flat plate air solar collector for use with solar desalination...
In this research paper, an attempt has been made to come across the effect of multiple glazing covers on the efficiency of a solar thermal collector. This experimental investigation was carried out on an active solar energy demonstration system (ET 200), illuminated with a halogen lamp. Three commercial glass panes of 3 mm thickness, having the same dimensions as that of the apparatus glazing, were...
The paper presents a study on heat transfer, friction loss and thermal performance behaviors in a solar air heater channel fitted with baffle turbulator (BT) or triangular-winglet vortex generator (WVG) at various winglet/baffle to channel-height or blockage ratios (BR=b/H=0.1 0.15 and 0.2). The BT and the WVG were placed only on the upper wall/absorber plate of the test channel at a single axial...
Packed beds are generally used for storage of thermal energy from solar air heaters. In this paper experimental study has been conducted on a porous packed bed solar air heater using iron chips as packing material. The parameters used for study include equivalent diameter of packing material ( iron chips) 1.51 mm, porosity 0.652 and 0.816, mass flow rate from 0.014 - 0.0365 kg/s and packing Reynolds...
Accurate performance and reliability evaluation of utility-scale photovoltaic (PV) systems requires accountability of solar gain contributions. A novel solar gain utility-scale inverter model has been developed to characterize inverter efficiency with respect to solar resource, general ambient conditions and thermal system losses. A sensitivity analysis was performed to evaluate the robustness of...
Today the market is open to new solutions that integrate solar thermal and photovoltaic (PV) devices into a single element in order to generate electricity and heat, the so-called photovoltaic thermal (PV/T or PVT) hybrid solar collectors. The PVT modules improve the performance of PV modules keeping the cells cooled, increasing the overall efficiency of the panel. One stand test for hybrid PVT systems...
A high-concentration photovoltaic (HCPV) system with high optic-electric transition efficiency was developed in order to increase the electrical energy generated by a photovoltaic system. However, device temperature rises quickly because of the solar cell operating under concentrated-light operation conditions. Therefore, system output power or energy-conversion efficiency decreases as the temperature...
In present study two identical with same dimensions, experimental set up of flat plate collectors using -heat pipes were fabricated. In each set up three identical wickless copper heat pipes are used having length 620 mm and outer diameter of 18 mm. The working fluid used in one set up is pure water and in another pure water with nanoparticles.
Solar heat receiver is currently one of the important research topics of renewable energy. In present article, experimental measurements and numerical analyses are conducted to investigate the heat transfer performances of high temperature molten salt in spirally grooved solar receiver tube. The molten salt is used as a working medium to study the heat transfer coefficients of spirally grooved solar...
A simplified mathematical model of heat transfer process in double skin façade was presented in this paper. The effects of outside environmental parameters and dimension of façade on the temperature of interior and exterior façade were analyzed and calculated. The results show that the main factor affecting façade temperature is solar irradiance, the temperature of interior and exterior façade would...
The sustainable development energy strategy in China is a low carbon energy strategy. Based on it, several new schemes about energy-saving of air-conditioned train are discussed in this article. Such as: change the existing air-flow organization in the air-conditioning system; using the plate-fin heat exchangers to pre-treat the fresh air; according to the change of outdoor weather conditions, effectively...
A study of the function performance of paraffin material in phase change thermal storing was presented. An experimental device was set up for the performance tests of the concentric tube-type phase-change heat store and for the investigation of the phase transition temperature field changing over time under constant temperature condition. Comparisons were carried out between the effects of changing...
Three roof types including single roof without solar collector and two types of integration of flat solar collectors and roof are considered and researched by experimental testing during daytime and nighttime. Through analysis of data from experimental testing, the following conclusions are obtained: (1) During summer daytime, heat flow into the building through the integration of flat solar collector...
With the help of LHTS (Latent Heat Thermal Storage) tank to primary Air Conditioning, a fresh air system of solar energy storage with LHTS is presented. In this paper, heat transfer characteristics of the system and Energy-saving optimizing design method for the compounded system were firstly studied. Then the structure of hardware and software were designed for, and the field and remote monitoring...
The field-synergy theory has been applied for convective heat transfer analysis of fluid flow inside solar wall, the factors affected convective heat transfer was discussed. The results indicate that increasing the gradient of heat flux along the vertical direction of solar wall-, increasing the ratio of vertical velocity u to horizontal velocity v(u/v>5) ^ and changing the direction of temperature...
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