摘要
Abstract
Water storage tank is widely applied in solar heating systems and domestic electrical water heaters. It is one of the key points which determine the performance of the system and the heater. A better stratification can improve the efficiency of solar heating system and the discharge amount of hot water in electrical water heaters. A new stratifier was designed and installed at the bottom of a cylindrical water storage tank. The test rig was established to measure the stratification characteristics of the tank. The initial temperature of the water in the tank is 50℃,the inlet temperature of the water is 20℃,the flow rate is 0.69L/min,2.14L/min,6.17L/min,respectively. The results showed that,when the larger the flow rate is,the larger is the slope of the sudden change in temperature curves,and the speed of temperature decrease is faster. Based on the thermodynamic laws,extraction efficiency, discharge efficiency and exergy efficiency were used to describe the stratification characteristics of the tank. The results showed that,when the flow rate is 0.69L/min,2.14L/min,6.17L/min,the extraction efficiency is 91.8%,95.7%,94.3%,the discharge efficiency is 96.6%,98.6%,97.5%,the exergy efficiency is 78.5%,83.1%,77.0%.关键词
储热水箱/分层/效率/流动/热力学Key words
water storage tank/stratification/efficiency/exergy/flow/thermodynamics分类
能源科技
