| 摘要 |
<p>The present invention provides an energy efficient air conditioner that can provide a continuous supply of air at dew point that is several degrees Celsius below zero, without requiring a defrost cycle. The air conditioner in accordance to present invention comprises a plurality of cooling coils with interconnecting refrigerant piping, refrigeration circuit consisting of compressor and condenser coils, control circuit and one or more electric motor driven centrifugal fan. The present invention uses two cooling systems. The first cooling system having single coil cools the air to a temperature just above zero deg. C, say four deg. C. so that the second stage gets a steady supply of cold air. The second stage has two coils, each being half the size of the first stage coil, thus taking half the air from it so that all the air from stagel passes through stage 2. In operation, only one coil of the second stage is active arid chills the air going through it to say minus 14 Deg. C. The other coil, being inactive, passes on the +4 Deg. C. air coming from the first stage. In order to prevent the active coil from icing up, a control circuit diverts the refrigerant to the second coil within a period short enough to prevent any significant ice build up in that coil. This goes on so that the total air flow is a steady 50% mixture of air at 4 Deg. C. and minus 14 deg. C. This works out to minus 5 Deg. C. at the output.</p> |
