Geographical Effect on Auxiliary Power of Solar Water Heaters in Taiwan

  • 黃 于城

Student thesis: Doctoral Thesis

Abstract

In response to global warming and climate change renewable energy has become an important topic Therefore the governments of various countries are actively promoting renewable energy sources such as wind power water power ocean currents biomass energy and solar energy Among them photovoltaic and solar heat play important roles in renewable energy applications Since Taiwan is located across the Tropic of Cancer and has long hours of sunshine it has considerable advantages in terms of promoting solar water heaters With the implementation of governmental subsidies for energy-saving equipment and policies supporting their use the installation of solar water heaters by the private sector is also quite common in Taiwan In order to meet the hot water needs of users a solar water heater has to be accompanied with a supplementary electrical heating device However different climatic conditions in various places in Taiwan such as locational differences the ambient temperature in different seasons solar radiation intensity and demand temperature settings etc will affect the demand for auxiliary electrical heat TRNSYS software which is commonly used in academia and industry is used in this research to calculate the solar energy absorbed by a solar water heater based on meteorological data collected for typical meteorological years The supplementary heat required to reach the setting water temperature for bathing is determined with the difference between the setting temperature and the hot-water-tank temperature at the time of 18:00 If the hot-water-tank temperature is not lower than the setting temperature no supplementary heat is required The short part is heated by an auxiliary electrical heater The overall annual power consumption performance showed a trend suggesting that the northeastern part of Taiwan has higher consumption than the central and southern parts and that the outlying islands consume more than the Taiwan Main Island The overall annual solar fraction performance showed a trend indicating that the central and southern parts of Taiwan have higher solar fractions than the northeast and that the Taiwan Main Island is higher than the outlying islands At the same time the annual simulated power consumption and solar fraction were found to be approximately linearly negatively correlated; that is to say a higher solar fraction means lower annual power consumption Overall whether one considers the annual power consumption or the solar fraction in terms of quantitative trends the overall performance of the central and southern regions was found to be significantly better than the other regions under consideration It is hoped that results of this research will be helpful in understanding the distribution of the supplementary heat demand for use of solar water heater in Taiwan
Date of Award2020
Original languageEnglish
SupervisorKeh-Chin Chang (Supervisor)

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