친환경 냉매 R407C 냉방기의 냉방효율 향상방안 연구

1 2015 ksr2015a144 R407C A Study on Improving Cooling Efficiency of environment-friendly refrigerant R407C air conditioners * , *, *, *, * Kyung Seob Kim , See Young Park*, Duk Soo Choi*, Myung Gon Bae*, Yu Son Ji* Abstract This study was applied to the existing R22 Freon gas instead of the environmental-friendly refrigerant 407C to the 21,000 /h air conditioners used in Seoulmetro Line 4. CFCs to escape from a bad influence on a greenhouse gas, and was performed for the purpose of improving efficiency of cooling cycle.

2 It was carried out, such as wind passes through the evaporator and condenser coils testing, compatibility with existing air condition system was designed so that there is no hindrance. The supplementary problems such as noise, leaks, and the condensed water be applied to the most efficient environment-friendly air conditioning was subjected cooling capacity design. Heat the 21,000 /h are absorbed in the cooling capacity of the evaporator which was the same per 1 unit through the design capacity, condensate and leakage of noise is remarkably improved effect could be obtained.

3 Keywords : Environment friendly refrigerants, Freon gas, Cooling cycle, Capacity design 4 21,000 /h R22 R407C , . , . , . 1 Unit 21,000 /h , . : , , , 1.. IPCC 4 (2007) 1 21.

4 (IPCC:Intergovernmental Panel on Climate Change) 4 [1] 280ppm 2005 379ppm , 1970 2004 80% . 2030 2000 : * 110% . 77% . , .. 2010 7 , 2009 2030 30%.

5 , . , 2015 . , , . 2. ( ) [2,3] 1 Unit 21,000 /h , , , , 21,000 /h . Table 1 Review of the environmental-friendly air conditioning performance.

6 (Kcal) 1 21,000 (10,700) 2EA =>21,400 Kcal 2 24,000 29,850 Kcal 20% 120 CMM 118 CMM 3 21,000 21,668 Kcal 3% 74 CMM 4 21,000 , 2EA => 21,170 Kcal Table 2 Compressor parts specifications Table 3 The capacity selection 1 (Kcal)10,700 2 3 4 H73A423 DWA5 (60Hz) 380 V 6 (W)4,100 7 EER/(COP) 8 (%) 68 9 (Kg) 10 (mm) 379 11 (m /h) Moliere diagram of cooling cycle.

7 (FIN & TUBE) , INNER GROOVED( ) . 1. AL. PIN & : (PIPE , AL,Cu ) 2. : C (Kcal) 1 (qe : / ) ia - ie 21,000 2 (AW : / ) ib - ia 3,440 3 (qc : / ) qe + AW 24,440 3. : 4. COIL : 5.

8 : 30% ( - + ), , , , Table 4 Condesing coil condenser capacity calculation 1. (A/m ) UNIT PIPE 4R 22S 2 2. K (Kcal/m h C) : - ( ). 3m/s (K = 40 ) 40 - 3. ( Tm)( C) Td(Td1-Td2) (54 .4C) (47 C) (35 C) 35 12 4. (Kcal/h) K x A x Tm (=40 x x ) 29,85029,850/24,400 = (22% ) (24,440 Kcal/h) Q( ) = G C t Q : (kcal/h) G : (Kg/h) - ( Kg/m ) C : ((Kcal/ C) - ( ) t : (t - t ) ( C) - 24,440 = G (47 - 35) -> G = (Kg/h) = 8,486 ,072(m /h)=> ( 80%) 40 CMM 4 ( 400) 4.)

9 1 Q = CMM, (CMM) / ( x ) , . COIL (1 UNIT : 21,000 Kcal/h) Table 5 Motor shaft power calculation : 4 15 , 1300mm, Al PIN PITCH (1EA) Kw . Table 6 Evaporator coil condensate capacity calculation (m ) (A) UNIT PIPE : 4R 15S 1 K (Kcal/m h C).

10 - 4m/s (K = 45 ) 45 - ( Tm, C) Td (Td1-Td2) 15 - :28 C - :12 C 5 28 16 23 (Kcal/h) K x A x Tm (= 45 x x 15) 21,668 21,000 Kcal (IUnit ) Table 7 The evaporator fan/motor specifications 1 FAN 180, 4EA ( ): 2 MOTOR 3 380V, 200W 4 4 EA : 21,000 Kcal/h.