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The model mainly relies on the sun position and tower and heliostat geometrical relations, namely, tower height and the ground distance of the concerned heliostats. This paper presents a mathematical model to design a small heliostat field with 3 dual-axis heliostat units located in Universiti Teknologi PETRONAS, Malaysia.
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These outcomes show that the prime system could succeed a yearly solar fraction of 0.58.Ībstract: Solar Power Tower systems have attracted the worldwide interest since the early 1980s and heliostat fields have been an area for development due to their high cost and important function.
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As a result of the method simplifying for the varying climate and different orientation of the components are analyzed. The suggested model operates with concentrating parabolic collectors, a NH 3-H 2O single effect absorption air-conditioning system, hot water storage with PCM and an external auxiliary boiler. The maximum hourly thermal load reaches 165 kW. This paper shows the results of the TRNSYS modeling and simulation of a solar absorption cooling system under the weather conditions of Chennai in order to partially satisfy the thermal demand of a building room. Refrigerant vapour is generated from the weak refrigerant-absorbent solution takes place in the middle tube of the generator, when hot water through the outer side is used as boiling medium and the pipe arrays inserted is the phase change material containment.
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The average tank temperature is found to be 50☌.Ībstract: A model has been established based on numerical calculation to analyze a vertical tube in tube stainless steel generator with forced convective boiling. The electrical efficiency, thermal efficiency, overall thermal efficiency, equivalent thermal efficiency, exergy efficiency are found to be 10%, 34%, 60%, 35% and 13% respectively. The simulated results of the Solar PV/T hybrid system are analyzed for the optimum water flow rate of 25 kg/hr. The prominent parameters used for determining the electrical efficiency, thermal efficiency, overall thermal efficiency, electrical thermal efficiency and exergy efficiency are the solar radiation, voltage, current, ambient temperature, mass flow rate of water, area of the PV module etc. In the present work, the modeling and simulation of a Solar Photovoltaic/Thermal (PV/T) hybrid system is carried out for 5 kWp using TRNSYS for electrical energy and thermal energy for domestic hot water applications. The PV/T system consists of PV panels with a battery bank, inverter etc., and the thermal system consists of a hot water storage tank, pump and differential thermostats. It is shown that night flushing reduces annual end-use cooling energy and peak cooling load of mechanical air conditioning systems by 55% and 15%, respectively.Ībstract: The PV/T hybrid system is a combined system consisting of PV panel behind which heat exchanger with fins are embedded. The office building is located in Germany with a highly glazed façade and night ventilation for passive cooling. The aim of this paper is to demonstrate the use of TRNLizard, an integrated thermal, daylight and airflow simulation tool based on Rhinoceros 5, Grasshopper, TRNSYS18, DaySIM and TRNFlow to develop and validate the concept for an energy efficient office building with a healthy, comfortable environment. However, some passive measures such as natural ventilation are more difficult to simulate and validate due to the complex, non-linear relationship between wind forces and thermal buoyancy. To help drive first decisions, an accurate and fast simulation tool that considers dynamic thermal, daylight and airflow models is required. Such design needs special considerations at the early stages that significantly affect decisions regarding passive strategies. It is shown that measures to create an exceptional, healthy environment for occupants drive conservation and energy efficiency. This paper argues that wellness and energy savings are not contradictory aspects of design. Some practitioners, therefore, prefer a fully sealed façade with a low glazing ratio to reduce energy consumption. However, their energy efficiency and impact on occupant comfort – thermal, glare and visual – are questioned. Designers and architects tend to lean towards fully glazed buildings in a multi-floor office building due to its light structure, transparency and more access to daylight compared to traditional buildings. Abstract: Despite growing interest in sustainable office buildings and technological advancements, often either comfort or energy is sacrificed at the expense of the other in the conventional approach.