Abstract
To examine the effects of solar heat utilization, it is necessary to classify the solar-use climate in East Asia based on climatic factors that affect load reduction by solar heating systems. In this study, annual load simulations are performed on weather data in 842 sites in Japan to analyze the climatic factors that impact the load reduction effect of the solar heating system. The analysis results were based on three climatic factors that strongly affect the heating load of a building: heating degree day (HDD18-18), daily solar global horizontal irradiance, and solar-heat available days. Furthermore, to distinguish the climate for the use of solar heat in East Asia, climate classification was done according to three climatic factors using the weather data of 1176 sites in East Asia. Consequently, the climate of solar thermal utilization in East Asia can be classified into 88 areas. Based on the regional classification for solar heat utilization proposed in this study, it will be possible to examine the effect of load reduction and applicability according to the use of solar heat in each region in the future.
Highlights
In recent years, the demand for the utilization of natural energy has been on the rise, owing to mandatory energy efficiency standards and global warming
Based on the climatic factors that affect the effectiveness of the solar heating system, climate classification was done for the use of solar heating in East Asia
In order to examine the heating load reduction effect of the solar heating system for varying climate characteristics in each region of East Asia, climate classification in East Asia is conducted based on three climatic factors
Summary
The demand for the utilization of natural energy has been on the rise, owing to mandatory energy efficiency standards and global warming. Through simulation, Yeh and Ho evaluated the method of increasing fluid velocity to reduce heat transfer resistance and decrease the temperature difference [11] Because these solar-use systems vary considerably in performance, depending on local climatic conditions, consumers are questioned about the effect of the system on initial costs. We aim to calculate the annual heating and hot water load reduction effect by experimenting with the liquid-type collecting system and the air-based collecting system in East Asia (China, Korea, and Japan). Based on these results, the feasibility of the solar heating system according to the climatic conditions in each region was examined. Based on the climatic factors that affect the effectiveness of the solar heating system, climate classification was done for the use of solar heating in East Asia
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