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Chapter 10, Problem 11RQ

What is the main difference between a zeotropic and an azeotropic refrigerant blend?

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A window in a tall building experiences a horizontal wind flow parallel to the surface at a velocity of 8 m/s. The window measures 2 m high, 1.5 m wide and 6.5 mm thick. The transition from the building wall to the window glass surface is not smooth. The window casement that surrounds the edge of glass pane is raised 10 mm above the surface of the glass and adjacent wall structure. Inside the building, the air temperature and heat transfer coefficient for the interior surface are 21 °C and 9 W/m² K respectively. The window has a uniform thermal conductivity of 1.4 W/m K. If the outdoor air temperature is 5 °C, determine the rate of convective heat loss from the window. Develop a thermal resistance network for the window system. Please state and justify all assumptions. Neglect any conduction through the casement. Assume the following air properties: kair =0.0248 W/m K, v= 14.20 x 106 m²/s, Pr = 0.712. Outside Air u=8m/s T=5°C casement glass Inside 2 m T=21°C h=9W/m² K 6.5 mm 1.5 m…
A thin electrical heater that dissipates 2 kW of thermal energy is position between two plane walls. The thickness of each wall is shown in the figure below. The thermal conductivities of sections A and B are 3 W/m C and 0.8 W/m C respectively. The electrical heater is assumed to be highly conductive (k=200 W/m C). The exterior surface of each wall experiences convective conditions as summarized below. (a) Construct the thermal circuit representing the steady state heat transfer for the system. Label all nodes, resistances and relevant terms. (b) Determine the temperate of the electrical heater. T = 50 C h = 200 W/m² C A 10 cm 6 cm B Electrical Heater T_ = 20 C h = 50 W/m² C K₁ = 3 W/m²K 0.05 cm k₁ = 0.08 W/m² K
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