太阳能斯特林热机循环热损失及热效率数值分析

基于实用施密特循环理论,在考虑流动阻力损失的基础上,建立太阳能斯特林热机的循环热损失及热效率数学模型.运用碟式太阳能斯特林热机的一个实例,着重分析了太阳能斯特林热机的各种热损失及热效率.研究结果表明：在各种热损失中,导热损失和穿梭传热损失所占的幅度相对较大,其中导热损失最显著.各种热损失与太阳能斯特林发动机的多种结构参数和设计性能参数密切相关,增加加热管内壁的温度,降低转速值可提高循环热效率.当热腔的温度大于750 K时,太阳能斯特林热机的循环热效率值将在卡诺效率值的65%~80%之间浮动.

Numerical analysis of heat loss impact on the thermalefficiency of the solar stirling heat engine

A model of stirling heat engine was established on application of practical schmidt cycle theory. The influence of heat loss based on the pressure loss for the thermal efficiency of the stirling heat engine with the use of an instance of the solar stirling heat engine was analyzed particularly. Results indicate that heat conduction loss and shuttle heat loss are more amount than all kinds of heat loss and heat conduction loss is the most significant. A variety of heat loss is closely related to structural parameters and performance parameters of the stirling engine. Increasing the temperature of heat pipe wall and decreasing the speed value would improve cycle thermal efficiency. When the temperature of the heater is more than 750K, the value of cycle thermal efficiency of the solar stirling engine will be very close to 65%~80% Carnot efficiency approximately.