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ABSTRACT
In this research heating, cooling and electrical demands of a residential tower are evaluated for Iran various weather conditions. For this purpose, several cities are selected as the representative of the specific weather conditions. To meet the cooling demand, desiccant cooling system plus alternative systems are applied. To analyze desiccant wheel, outlet humidity and temperature have been modeled. Also, the effect of rotational speed and regeneration temperature on entropy generation of the desiccant wheel has been studied based on the obtained results. It is deduced that the entropy generation may be increased by increasing the regeneration temperature and the rotational speed. To regenerate the desiccant wheel, to meet the electrical demand and also to provide heating load, prime mover in the form of internal combustion engine is selected. Since prime movers do not operate in the full load, their performance in the partial load has been evaluated. By taking into consideration the required regeneration heating, the number of required prime movers has been calculated based on the regeneration temperature and partial load for each city. The results show that the number of required prime movers is increased by increasing the regeneration temperature of the wheel.
Nomenclature
| cp | = | heat capacity (J/kg C) |
| CCHP | = | combined cooling, heating and power |
| db | = | dry bulb |
| = | electrical power (kW) | |
| f | = | friction coefficient |
| H | = | altitude (m) |
| LHV | = | low heat value (kJ/kg) |
| = | mass flow rate (kg/s) | |
| N | = | rotational speed (rpm) |
| n | = | number |
| nom. | = | nominal |
| o | = | output |
| p | = | pressure (pa) |
| = | saturation pressure of water vapor at Tdb (Pa) | |
| = | saturation pressure of water vapor at Twb (Pa) | |
| PL | = | partial load |
| PM | = | prime mover |
| = | heat transfer rate (kW) | |
| R | = | gas constant (J/kg K) |
| RAFV | = | root absolute fraction of variance |
| Re | = | Reynolds number |
| = | entropy (W/K) | |
| s | = | specific entropy (J/kg K) |
| T | = | temperature (C) |
| t | = | target |
| V | = | velocity (m/s) |
| wb | = | wet bulb |
| WJ | = | water jacket |
Greek Letters
| ε | = | effectiveness |
| ρ | = | density (kg/m3) |
| η | = | efficiency |
| = | specific volume (m3/kg) | |
| = | relative humidity | |
| ω | = | humidity ratio (kg/kg) |
Subscripts
| ref. | = | reference |
| amb | = | ambient |
| CC | = | cooling coil |
| d | = | dry |
| e | = | exit |
| EC | = | evaporative cooler |
| Ex | = | exhaust |
| f | = | fuel |
| gen | = | generation |
| i | = | inlet |
| o | = | outlet |
| p | = | process |
| r | = | room |
| reg | = | regeneration |
| s | = | surface |
| v | = | vapor |