Abstract Experimental study on the effects of solid volume fraction and temperature on thermal conductivity of DWCNT(inner diameter of 3 nm)-ZnO(diameter of 10-30 nm)/water-ethylene glycol (60:40) nanofluids have been performed using KD2-Pro thermal analyzer in details. The experiments are carried out at solid concentration up to 1% and temperature ranging from 25 to 50 °C. Based on experimental results, using non-linear regression on results of experiments, a correlation as a function of temperature and solid volume fraction has been proposed. Measured data show that the relative thermal conductivity enhances with increasing concentration of nanoparticles. The increasing temperatures also increase the thermal conductivity of nanofluids, although its effect on the thermal conductivity compared to the effect of volume fraction is lower.