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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