| Title |
Comparison of Condenser Characteristics Using R407C and R22 on the Same Inlet Temperature Condition |
| Keywords |
Alternative refrigerant ; 대체냉매 ; R407C, Condensation ; 응축 ; Heat transfer rate ; 열전달률 ; Pressure drop ; 압력강하 |
| Abstract |
R407C is considered as an alternative refrigerant to R22 for air conditioners. An experimental investigation was made to study the characteristics of the condensation heat transfer and pressure drop for R407C flowing in a fin-and-tube heat exchanger used for commercial air-conditioning units. Experiments were carried out under the conditions of inlet refrigerant temperature of 60℃ and refrigerant mass flux varying from 150 to 250kg/m2s for refrigerant side. The inlet air has dry bulb temperature of 35℃, relative humidity of 50% and air velocity varying from 0.8 to 1.6m/s. Experiments show that air velocity increased by 25% is needed for R407C than that of R22 for subcooling temperature of 5℃, which resulted in air-side pressure drop increase of 28.8% for R407C as compared to R22. As a consequence, in order to provide the same design condition of a condenser, the fan requires higher electric- power consumption with R407C than that with R22. |