Chapter 6, Problem 6.64P

Still Air, 101.3 kPa, 15°C The image above is of a jet engine flying to the right at speed 254 meters/sec through still air. The engine inlet area is 0.9 m². Determine the mass flow rate of the air into the engine in kg/sec. You answer should include one unit after the decimal place.

1. As shown in the figure below, Refrigerant 134a enters a condenser operating at steady state at 70 lbf/in2, 160 °F and is condensed to saturated liquid at 60 lbf/in on the outside of tubes through which cooling water flows. In passing through the tubes, the cooling water increases in temperature by 20 'F and experiences no significant pressure drop. Cooling water can be modeled as incompressible with v-0.0161 ft'/lb and c = 1 Btu/lb R. The mass flow rate of the refrigerant is 3100 lb/h. Neglecting kinetic and potential energy effects and ignoring heat transfer from the outside of the condenser, determine: (a) The volumetric flow rate of the entering cooling water, in gal/min (b) The rate of heat transfer, in Btu/h, to the cooling water from the condensing refrigerant (5 points) Refrigerant 134a P= 70 in. T= 160 F 3100 heh 7,-7,-20F-20R Reirigerant 134a [P-60 lbin V Saturated liquid

Refrigerant 134a enters an insulated diffuser as a saturated vapor at 120°F with a velocity of 1200 ft/s. The inlet area is 1.4 in?. At the exit, the pressure is 400 Ibf/in? and the velocity is negligible. The diffuser operates at steady state and potential energy effects can be neglected. Determine the mass flow rate, in Ib/s, and the exit temperature, in °F.