太阳能热水系统热性能与流动性能研究

STUDY ON THERMAL PERFORMANCE AND FLOW CHARACTERISTIC OF SOLAR WATER HEATING SYSTEM

直流式比自然循环式太阳能热水系统有许多优点,温控阀控制的直流式热水系统更具竞争力。必须重视流动性能和阻力特性对直流系统的影响。应采用热性能与流动性能相结合的方法对直流式热水系统进行评价。

Once-through solar water heating stystem has many advantages over the conventional natural circulation system,by comparing the system using magnet-valve with the system using temperature regulating valve,we find the latter system has more competitiveness in utilization.With the analysis of the results of a long-term investigation of once-through system in series,it is pointed out that the influence of flow and resistance characteristic on the thermal performance of once-through system should be considered seriously.A research method based on the compositing of thermal performance and flow characteristic and the combining of theory and practice is given for once-through system study.