??????????????????????????????????????35 kW ????

1
?? ???

• ???????????
• ?????????
• ??????????????????????????????????????35 kW ????
• ?????????????????

2
?????

• ??????
• ?????????????
• ???11.8mm??
• ??????
• 1.?????
• 2.??????
• (????????????)
• capillary tube-suc-tion line heat exchanger.

3
?????????

• ???????????????????
• ?????????????????????,?????????????????????
  ????????, ?????????
• ????????????????????????

4
???????

• 0-1 ????
• 1-2 ???
• 2 bubble point
• 2-3 ?????
• 3 ??
• 3-4 ????
• 0-1-2 ??
• 0-2 liquid length
• 2-3 two-phase length

5
????? (chock)
6
??????

• ???????????????
• ??????????????????????
• ??????????????????????????
• ???????????????????????????
• ???????Liquid trapping??????????????

7
????????????

• seamless copper tube Standard
• ASTM B 75
• hand-drawn copper tubes Standard
• ASTM B 360
• standard diameters and wall thicknesses
• airflow capacity rating
• ASHRAE Standard 28

8
???????

9
???????

10
???????

• ?? ????????
• ???? 
• ????Rmax 1 µm? 
• ???0.2 mg/m ? 
• ???0.5 mg/m ? 
• ???0.5 mg/m ? 
• ???7 PPM ?
• ?? ??2.0 m/m ? 0.05 m/m
• ??0.8 m/m ? 0.02 m/m

11
????????????

• ??????? 
• ????ø 0.5 m/m ø 2.0 m/m
• ???????? 1040 mmHg 
• ???? 800 mmHg 
• ???? 800 mmHg
• ??????

12
????????????

• ????? 
• ????ø 0.5 m/m ø 1.2 m/m
• ????
• ???? 12Kgf/cm2
• ???? 0.5Kgf/cm2 9Kgf/cm2
• ??????

13
????????????

• ?????? 
• ????
• 0 liters/min 20 liters/min
  20 liters/min 40 liters/min
• Selectable
• ????
• ???? 1.2Kgf/cm2
• ???? 1.0Kgf/cm2
• ??????

14
??????????????????

15
???????????

16
R-134a ??????

17
R-134a ??????

18
R-410A ??????

19
R-410A ??????

20
Generalized Prediction Equations
21
Generalized Prediction Equationsby Wolf et al.

• ?????

22
Generalized Prediction Equationsby Wolf et al.

• ?????

23
Generalized Prediction Equationsby Melo.

• ?????
• R12

24
Sample Calculations

• Example 1. Determine the mass flow rate of R-134a
  through a capillary tube of 1.10 mm ID, 3.0 m
  long, operating without heat exchange at 1.4 MPa
  inlet pressure and 15 K subcooling.
• Solution From Figure 41, at 1.4 MPa and 15 K
  subcooling, the flow rate of HFC-134a for a
  capillary tube 0.864 mm ID and 3.302 m long is
• 7.5 kg/h. The flow factor f from Figure 42 for a
  capillary tube of 1.10 mm ID and 3.0 m long is
  2.0. The predicted R-134a flow rate is then 7.5
  2.0 15.0 kg/h.

25
????????????

0.052 lt Dc/L lt 0.13 0.001 lt di/L lt 0.0016.
26
????

1. 1998 ASHARE HANDBOOK CHAPTER 45.21 CAPILLARY
   TUBES
2. ???????? 1995/12 ????????
3. A Performance Comparison Between Coiled and
   Straight Capillary Tubes Chung-Szu Wei, Yur-Tsai
   Lin, and Chi-Chuan Wang
4. ??????????? ??? ???