Temperature losses versus pressure losses Progress of pressure curve-At/Ap [K/Pa] 0.2 。Loss in saturation 一R.12 temperature due to -R13 given pressure loss 0.15 -R290 -R-407C (tU△pj)for CO2is5to 一-R22 10 times lower than dyAv R407C R-717 HFC and ammonia --R41M 0.1 --R-744 Dimensioning of heat exchangers with R410A R134a relative high pressure. Gives high heat 0.05 R12 transfer. CO2 Pipes can be designed N R290 for high velocities -20 2n 100 without having high Saturation temperature,t[C] temperature loss ONTNU 17 ②SINTEF Mixtures of working fluids with HFC Binary or tertiary mixtures for use in heat pump systems ·R404A -HFC-125(44%),HFC-143a(52%),HFC-134a(4%) -Temperature glide approx 0.7 K(approximately azec ·R407C -HFC-125(25%),HFC-32(23%),HFC-134a(52%) -Temperature glide approx.7.5 K(zeotrope) ·R410A -HFC-125(50%),HFC-32(50%) -Temperature glide approx.0.2 K(approximately azeotrop) 回NTNU 18 SINTEF17 Temperature losses versus pressure losses Progress of pressure curve – Dt/Dp [K/Pa] • Loss in saturation temperature due to given pressure loss (Dt/Dp) for CO2 is 5 to 10 times lower than HFC and ammonia • Dimensioning of heat exchangers with relative high pressure. Gives high heat transfer. • Pipes can be designed for high velocities without having high temperature loss CO2 NH3 R12 R290 Metningstemperatur [°C] Dt/Dp [k/kPa] Saturation temperature, t [oC] 18 Mixtures of working fluids with HFC Binary or tertiary mixtures for use in heat pump systems • R404A – HFC-125 (44%), HFC-143a (52%), HFC-134a (4%) – Temperature glide approx 0.7 K (approximately azeotrope) • R407C – HFC-125 (25%), HFC-32 (23%), HFC-134a (52%) – Temperature glide approx. 7.5 K (zeotrope) • R410A – HFC-125 (50%), HFC-32 (50%) – Temperature glide approx. 0.2 K (approximately azeotrop)