为解决海洋温差能发电中换热器的计算问题,基于 MATLAB软件,提出一种应用于海洋温差能发电(ocean thermal energy conversion,OTEC)满液式换热器沸腾传热与凝结传热的传热计算方法,并建立海洋温差能满液式换热器数学模型.在此模型的基础上,针对表层 25～30℃温海水、深层 4～6℃冷海水的OTEC循环工况,分析不同循环工况下换热器传热系数的变化情况;针对进水温度、进水流量、壳程压力对换热效率的影响进行数值计算,得出OTEC循环工况下不同因素对满液式换热器传热系数的影响.研究表明,OTEC循环工况下蒸发器传热系数与温海水的进水温度、流量、壳程压力呈正相关;冷凝器传热系数与冷海水的流量呈正相关,与进水温度、壳程压力呈负相关.通过海洋温差循环试验平台进行试验,将试验结果与数学模型相对比,验证了数学模型的准确性.
Heat transfer calculation method and experimental study on ocean thermal en-ergy conversion flooded heat exchanger
In order to solve the calculation problem of heat exchanger in ocean temperature difference energy generation,we proposed a heat transfer calculation method applied to the boiling heat transfer and condensation heat transfer of ocean thermal energy conversion(OTEC)full-liquid heat exchanger based on MATLAB software,and established a mathematical model of ocean thermal energy full-liquid heat exchanger,and analyzed the change of heat transfer coefficient under different cycle qualities on the basis of this model.On the basis of this model,the changes of heat transfer coefficients of heat exchangers under different circulating qualities were analyzed for the OTEC circulating conditions of 25-30℃for surface warm seawater and 4-6℃for deep cold seawater.At the same time,the influence of inlet water temperature,inlet water flow rate and shell pressure on the heat transfer efficiency was calculated,and the influence of different factors on the heat transfer coefficient of the full-liquid heat exchanger under the OTEC cycle condition was obtained.The study showed that the heat transfer coefficient of the evaporator was positively correlated with the inlet water temperature,flow rate and shell pressure of warm seawater under OTEC cycle condition;the heat transfer coefficient of the condenser was positively correlated with the flow rate of cold seawater,and negatively correlated with the inlet water temperature and shell pressure.The test was carried out through the ocean temperature differential cycle test platform,and the test results were compared with the mathematical model to verify the accuracy of the mathematical model.
ocean thermal energy conversionflooded heat exchangerboiling heat transfercondensation heat transferheat transfer calculation
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