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Magnetic gear pump Filter Tube in tube subcooler Plate heat exchanger Shell and tube heat exchanger Charging port Pressure relief valve p C T W Pressure relief valve Dielectric fitting Liquid reservoir TEMPER loop TEMPER loop TEMPER loop Pressure relief valve Expansion vessel Preheater SENSORS C: Coriolis mass flow meter p: absolute pressure sensor T: resistance thermometer ∆p: differential pressure sensor W: wattmeter V: voltage gauge Throttling valve Dielectric fitting p p ∆p2 ∆p Diabatic test section Adiabatic test section ∆p ∆p T Measure section M V +− Figure 1. Experimental apparatus scheme. 9000 8000 7000 6000 5000 4000 3000 2000 1000 0 0.0 R134a - G=198 kg/m2 s tsat=4.2 °C q=8.5 kW/m2 R134a - G=252 kg/m2 s t =5.8 °C q=10.0 kW/m2 a) sat R134a - G=301 kg/m2 s tsat=5.8 °C q=10.0 kW/m2 R134a - G=350 kg/m2 s tsat=5.0 °C q=9.9 kW/m2 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 Vapour Quality 9000 8000 7000 6000 5000 4000 3000 2000 1000 0 0.0 0.1 0.2 0.3 b) R744 - G=202 kg/m2 s tsat=4.2 °C q=10.1 kW/m2 R744 - G=252 kg/m 2s tsat=5.7 °C q=10.2 kW/m2 R744 - G=300 kg/m2 s tsat=5.8 °C q=10.3 kW/m2 R744 - G=348 kg/m2 s tsat=5.0 °C q=10.0 kW/m2 0.4 0.5 0.6 0.7 0.8 0.9 1.0 Vapour quality 6000 5500 5000 4500 4000 3500 3000 2500 2000 1500 1000 500 0 0.0 0.1 R134a - G=349 kg/m2s t c) =-8.8 °C q=10.1 kW/m2 sat 0.2 0.3 R134a - G=353 kg/m2s tsat=-6.8 °C q=10.0 kW/m2 R134a - G=337 kg/m2 s tsat=-1.3 °C q=10.2 kW/m2 R134a - G=350 kg/m2 s tsat=5.0 °C q=9.9 kW/m2 R134a - G=351 kg/m2s tsat=12.5 °C q=10.1 kW/m2 R134a - G=350 kg/m2s tsat=19.9 °C q=10.1 kW/m2 0.4 0.5 0.6 0.7 0.8 0.9 1.0 Vapour quality 9000 8000 7000 6000 5000 4000 3000 2000 1000 0 0.0 0.1 0.2 0.3 d) R744 - G=349 kg/m2 s tsat=-7.8 °C q=10.1 kW/m2 R744 - G=349 kg/m2 s tsat=-3.2 °C q=10.1 kW/m2 R744 - G=348 kg/m2 s tsat=5.0 °C q=10.0 kW/m2 0.4 0.5 0.6 0.7 0.8 0.9 1.0 Vapor Quality Figure 2. Flow boiling heat transfer coefficients for q (heat flux) equal to 10 kW/m2: at tsat (saturation temperature) almost equal to 5.0 °C varying G (mass flux) between 200 and 350 kg/m2s for R134a [a)] and R744 [b)]; at G = 350 kg/m2s varying tsat between -9.0 °C and +20 °C for R134a [c)] and between -8.0 °C and +5.0 °C R744 [d)]. https://doi.org/10.24084/repqj07.436 580 RE&PQJ, Vol. 1, No.7, April 2009 h [W/m2 K] h [W/m2 K] h [W/m2 K] hM [W/m2 K]PDF Image | Comparison of R744 and R134a
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