Journal of Solar Energy Research Updates

Design and Testing of Transmissive Fresnel Concentration and Thermoelectric Power Generation System

2025-02-06T10:57:41+00:00

In this paper, a concentrating photovoltaic and temperature difference combined power generation device is designed. The device is guided by the problem of low power generation efficiency of solar cells at high temperature, and transfers the heat of photovoltaic cells to thermoelectric cells to achieve secondary power generation. The research takes the cold end of the thermoelectric battery as the entry point, and studies its influence on the device by controlling the flow rate and temperature of the cooling liquid in the water-cooled radiator. The results show that when the flow rate is 0.5L/min ~ 2.5L/min, the photovoltaic current increases linearly and then increases nonlinearly, while the photovoltaic voltage decreases linearly and then increases nonlinearly. When the water temperature increases from 15°C to 27°C, the photovoltaic current, photovoltaic voltage and thermoelectric voltage decrease with the increase of water temperature, while the thermoelectric current increases with the increase of water temperature. Therefore, selecting the appropriate flow rate and water temperature can further improve the power generation efficiency and performance of the system.

Using Point of Common Coupling (PCC) for Power Shaving in Grid Connected Hybridized Network

2025-03-20T15:42:11+00:00

A network that connects all components together is referred to as a grid. A study has been conducted over hybrid system which is a self-sustainable grid. The hybrid system is connected with the grid at Point of Common Coupling (PCC). The aim of this paper is to focus on the behavior of different intermittent energy sources, which are complementary to each other or not. For this purpose, research papers related to different intermittent energy sources are considered, and the behavior of renewable sources in different regions are discussed. Integration of solar, wind and battery sources to main grid, and a suitable control system for the PCC is presented that provides uninterrupted power flow from the hybrid system to load and the main power grid. The current and voltage regulator on PCC are optimized by Particle swarm optimization (PSO) algorithm. The hybrid system in this paper contains multiple power generator sources that include photovoltaic cells (PV), wind turbine and battery. Negative impact on main power grid by changing power through PCC are also examined.

Retrofitting Sunspaces in Qinghai-Tibet Plateau Vernacular Dwellings: A Mini Review of Solar Gain Enhancement Strategies and Cultural Preservation Challenges

2025-03-27T04:44:06+00:00

In the context of climate change and the depletion of traditional energy sources, it is significant to explore passive building technologies that are suitable for specific climatic and geographical conditions. This paper reviews strategies for retrofitting sunspaces in vernacular dwellings on the Qinghai-Tibet Plateau, focusing on enhancing solar gain and addressing cultural preservation challenges. The unique solar utilization characteristics and architectural forms are discussed, highlighting the need for tailored retrofit technologies. The paper analyzes the technological typology of sunspaces, including sun passageways, sunrooms, and sun courts, and evaluates their performance in terms of temperature rise, economic viability, user acceptance, and cultural adaptability. Implementation barriers, such as technical, social, and economical constraints, are identified, and emerging solutions are proposed to overcome these challenges. The study aims to provide insights for future retrofit projects that balance thermal performance improvement with cultural integrity preservation in high-altitude region.