Table 3 Specific heat of KNO3 and the nanofluids obtained with 1.0 wt.% of different nanoparticles
KNO3 | KNO3 + SiO2 | KNO3 + Al2O3 | KNO3 + SiO2-Al2O3 | |||||
---|---|---|---|---|---|---|---|---|
C p (J/g °C) | C p (J/g °C) | C p (J/g °C) | C p (J/g °C) | |||||
Solid | Liquid | Solid | Liquid | Solid | Liquid | Solid | Liquid | |
First run | 1.169 | 1.196 | 1.294 | 1.281 | 0.996 | 1.123 | 1.369 | 1.386 |
Second run | 1.197 | 1.205 | 1.298 | 1.286 | 1.194 | 1.185 | 1.385 | 1.390 |
Third run | 1.199 | 1.210 | 1.307 | 1.287 | 1.206 | 1.182 | 1.396 | 1.363 |
Fourth run | 1.173 | 1.198 | 1.290 | 1.267 | 1.150 | 1.114 | 1.347 | 1.306 |
Fifth run | 1.121 | 1.136 | 1.263 | 1.240 | 1.120 | 1.082 | 1.283 | 1.256 |
Sixth run | 1.118 | 1.134 | 1.224 | 1.203 | 1.068 | 1.043 | 1.171 | 1.095 |
Enhancement (%) | – | – | 9.5 | 6.1 | −4.5 | −7.8 | 4.7 | −3.4 |