Fundamentals Of Engineering Thermodynamics
9th Edition
ISBN: 9781119391388
Author: MORAN, Michael J., SHAPIRO, Howard N., Boettner, Daisie D., Bailey, Margaret B.
Publisher: Wiley,
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Chapter 4, Problem 4.52P
a.
To determine
The volumetric flow rate of entering cooling water, in gal/min.
b.
To determine
The heat transfer rate from condensing refrigerant to cooling water.
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4.10
In an air conditioning system running at steady-state, m ̇ = 0.7 kg/s of refrigerant 3
134a in saturated liquid state at 48◦C flow through a throttling valve reducing its pressure
to a value of p4 = 4 bars. The system is shown in Fig. 1. Then the refrigerant flows through
the internal side of a heat exchanger exiting at saturated vapor with p5 = p4. Air enters the
external side of the heat exchanger at T1 = 300 K and exits at T2 = 295 K moved by a fan ̇
Figure 1: Problem 1
that consumes WCV = 0.15 kW. Determine the mass flow rate of the air, in kg/s
A 300-lb iron casting. initially at 600°F, is quenched in a tank filled with 2121 lb of oil, initially at 80°F. The iron casting and oil can be
modeled as incompressible with specific heats 0.10 Btu/lb - °R. and 0.45 Btu/lb - °R, respectively.
(a) For the iron casting and oil as the system.determine the final equilibrium temperature, in °F.
Ignore heat transfer between the system and its surroundings.
°F
(b) For the iron casting and oil as the system,determine the amount of entropy produced within the tank, in Btu/°R.
Ignore heat transfer between the system and its surroundings.
Btu/°R
Chapter 4 Solutions
Fundamentals Of Engineering Thermodynamics
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- = 95°F and m3 = 1.5 lb/s. Refrigerant 134a The figure belows shows three components of an air-conditioning system, where T3 flows through a throttling valve and a heat exchanger while air flows through a fan and the same heat exchanger. Data for steady- state operation are given on the figure. There is no significant heat transfer between any of the components and the surroundings. Kinetic and potential energy effects are negligible. Air Tj = 535°R C,= 0.240 Btu/I6•°R Saturated liquid R-134a T3, ṁ3 Fan Wey = -0.2 hp Throttling valve 4 Saturated vapor P5=P4 P4 = 60 lbf/in.2 T = 528°R -Heat exchanger Modeling air as an ideal gas with constant c, = 0.240 Btu/lb· °R, determine the mass flow rate of the air, in Ib/s. i Ib/sarrow_forwardConsider you have an insulated mixing chamber at steady state. This control volume receives two liquid streams at T1 and T2 (with mass flow rates of m1,and m2) and delivers a single stream as an output at T3 and m3.Use the incompressible substance model (with constant specific heat c), neglect the kinetic and potential energy effects, and obtain an expression for T3 in terms of T2, T1 and m1/m3.arrow_forwardA 300-lb iron casting, initially at 600°F, is quenched in a tank filled with 2121 lb of oil, initially at 80°F. The iron casting and oil can be modeled as incompressible with specific heats 0.10 Btu/lb. °R, and 0.45 Btu/lb. °R, respectively. (a) For the iron casting and oil as the system,determine the final equilibrium temperature, in °F. Ignore heat transfer between the system and its surroundings. T₁ = i (b) For the iron casting and oil as the system,determine the amount of entropy produced within the tank, in Btu/°R. Ignore heat transfer between the system and its surroundings. J = °F Mi Btu/ºRarrow_forward
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