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Typical Outdoor Refrigerant Pipe Installation Criteria  
Environment Condition
(1) Outdoor Condition, θm at 35 , 95% RH, Wind Speed=1m/s
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(2) Dew Point, θd=34.3 
Material Technical Factor
(1) Thermal Conductivity, λ<0.037W/m.K (at 20 mean Temp.)
(2) Surface Coefficient, h=13.5 (Black Matt Surface)
(3) Fluid Operating Temperature, θ1=0
Other Factors Considered
(1) Global warming effect
(2) Safety margin
(3) Energy Efficiency
Remarks : The Environment Conditions Extracted From official website : www.eld.emsd.gov.hk of EMSD