Research of Solar High-Temperature Air Heating System

• Main Authors: Jhen-Yao Hong, 洪振堯
• Other Authors: 李文興
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/b352t8

碩士 === 國立臺北科技大學 === 能源與冷凍空調工程系碩士班 === 100 === The main purpose of solar thermal energy focuses on domestic the hot water at present. The hot water energy will be transferred to the air by using the heat exchanger. The air will be turned into the high temperature, and it can be used in drying or heating process. Generally speaking, outside air runs through the heat exchanger, and the temperature is about 40~50℃. This study uses new design of high-temperature air heating system with solar collector system, and the air can be increased to more than 80℃. Solar high-temperature air heating system chose the specification of pump according to the standard flow rate. This may result in waste of electricity energy. This study uses the optimal performance point tracking control system. The pump and fan are minimum energy consumption, and the COP is Maximum. The definition of coefficient of performance is the ratio of air energy with pump and fan energy. The test results show that the COP of solar high-temperature air heating system is 25 by frequency conversion control, and it is 5.2 by not frequency conversion control. Under different solar radiation, the efficiency of the collector and the air are different. The definition of efficiency is ratio of collector (or air) and solar energy. The test results show that the average solar radiation is 511W/m^2 and it is steady in sometime. The pump and fan are running at full speed, the efficiency of collector can attain 62%, and the efficiency of air is 51%. When the average solar radiation is 790W/m^2 and steady, the pump and fan are running at frequency conversion. The efficiency of collector is 59%, and the efficiency of air is 46%. Use of frequency conversion control, the pump energy consumption is from 7.7MJ to 2.2MJ by frequency conversion control, and save 71.4 % of pump energy consumption. The fan energy consumption is from 21.2MJ to 5MJ by frequency conversion control, and save 76.4 % of fan energy consumption. It effectively increases the application value.