摘要
本文通过实验研究了水/氧化锌纳米流体作为工作流体对太阳能集热器性能的影响,其中纳米粒子的体积浓度为0.4%,粒径为40 nm,流体的质量流量为1~3 kg/min。平板集热器吸收的太阳能被水/氧化锌纳米流体吸收,纳米流体被泵送到热交换器对水进行加热。测量设备不同部位的温度、辐射水平、流量和压力,使用ASHRAE标准来计算效率,结果表明:与水相比,使用水/氧化锌纳米流体可提高集热器的性能;当质量流量为1 kg/min时,与水相比,纳米流体可使集热器效率提高16%。
In this article,the effect of using water/zinc oxide nanofluid as a working fluid on the performance of solar collector is investigated experimentally.The volumetric concentration of nanoparticles is 0.4%,and the particle size is 40 nm,and the mass flow rate of the fluid varies from 1 to 3 kg/min.For this experiment,a device has been prepared with appropriate measuring instruments whose energy source is solar radiation.The solar energy absorbed by the flat plate collector is absorbed by the nanofluid of water/zinc oxide.The nanofluid is pumped to the consumer,a heat exchanger,where it heats the water.The temperature,radiation level,flow rate,and pressure in different parts of the device were measured.The pressure drop and the heat transferred are the most important results of this experimental work.The ASHRAE standard is used to calculate efficiency.The results showed that the use of water/zinc oxide nanofluid increases the collector performance compared to water.For 1 kg/min of mass flow rate,the nanofluids have a 16% increase in efficiency compared to water.From the results,it can be concluded that the choice of optimum mass flow rate in both water and nanofluid cases increases efficiency.
