Research Article
Characterization of Local Nano-Heat Transfer Fluids for Solar Thermal Collection
Table 1
Acronyms, abbreviations, and subscripts.
| Nomenclature | | Viscosity () | | Volume flow rate () | | Temperature efficiency (%) | | Energy efficiency (%) | | Efficiency of nanofluid (%) | | Useful heat (J) | | Solar power intensity (Wm−2) | | Minimum capacity heat rate | | Maximum capacity heat rate | | Prandtl number | | Heat flux | | Specific capacity at constant mass | UA | Overall conductance (W/m2°C) | U | Overall coefficient of heat transfer (W/°C) |
| Abbreviations | HTF | Heat transfer fluid | NTU | Number of heat transfer units | A | Total transfer of heat surface area | | Dimensionless heat capacity ratio | A | Area | T | Temperature | l | Length | | Effectiveness |
| Subscripts | ht | Hot | o, c | Outlet cold stream | i, h | Inlet hot stream | i, c | Inlet cold stream | p, m | Pressure, mass | 2, i | Stream 2, inlet | 2, o | Stream 2, outlet | 1, i | Stream 1, inlet | cm | Value with constant property | r | Direction |
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