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The Effect of Increasing Sub-Cooling on Air-Cooled A/C System's Capacity | ||
| Journal of Engineering and Sustainable Development | ||
| Article 1, Volume 13, Issue 1, 2009, Pages 58-72 | ||
| Authors | ||
| Arkan F. Said; M. N. Hamid; Ghanim K. Abdul Sada | ||
| Abstract | ||
| The present research covers the effect of adding extra water-cooled condenser in series with the main vapor compression refrigeration system as a heat sink source for system sub-cooling. An experimental laboratory study has been done on a split unit air-conditioner with a (24000 Btu/hr) nominal capacity, taking into consideration the effect of outdoor ambient temperature and cooling load. A high accuracy fully instrumented experimental rig interfaced with a computer has been constructed, especially designed for refrigerant R22, using a capillary tube with size chosen according to ASHRAE to control the refrigerant mass flow rate. The extra refrigerant sub-cooling temperature difference was between TSC= 5 oC and 10 oC, this value was chosen in order to not to exceed the limits of the original system sub-cooling. The experimental results show that there is an increase in the system capacity by +1.37% to +7.065% when TSC= 5 oC, for ambient temperature between Tamb=30 oC and 46 oC, and +4.1% to +14.13% when TSC= 10 oC for the same previous Tamb. The power consumed per ton of refrigeration shows a decrease by -0.948% to -3.417% for TSC= 5 oC, and -2.84% to -7.745% for TSC= 10 oC for the same ambient temperature previously mentioned. The benefit from the sub-cooling technique is higher in regions with high and constant-year round temperatures, where there is no previous analytical and experimental study for systems with air-cooled condensers, but still covers the installation of the extra equipments costs. Moreover, the compressor and the condenser can be downsized due to the increase in the effective capacity | ||
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