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Hot air for a large-scale drying operation is to be produced by routing the air over a tube bank (unmixed), while products of combustion are routed through the tubes. The surface area of the cross-flow heat exchanger is A = 25 m2, and for the proposed operating conditions, the manufacturer specifies an overall heat transfer coefficient of V = 35 W/m2 · K. The air and the combustion gases may each be assumed to have a specific heat of cp = 1040 J/kg · K. Consider conditions for which combustion gases flowing at 1 kg/s enter the heat exchanger at 800 K, while air at 5 kg/s has an inlet temperature of 300 K.
(a) What are the air and gas outlet temperatures?
(b) After extended operation, deposits on the inner tube surfaces are expected to provide a fouling resistance of R'f = 0.004 m2 · K/W. Should operation be suspended in order to clean the tubes?
(c) The heat exchanger performance may be improved by increasing the surface area and/or the overall heat transfer coefficient. Explore the effect of such changes on the air outlet temperature for 500 < ua="">< 2500="" w/k.="">
In a simple model of the hydrogen atom an electron has a circular orbit of radius 5.0 x 10-11 m around a stationary proton.(a) the magnitude of the electrical force exerted by the proton on the electron, (b) the speed of the electron in its motion ar..
An electroencephalographic (EEG) signal x(t) is recorded from the surface of the head (scalp) via an EEG recording machine. The EEG machine has a bank of 4 ideal band-pass (BP) analog filters, H1(jω), H2(jω), H3(jω) and H4(jω)
It is difficult to compute the Laplace transform X(s) of signal x(t)=1/t* u(t) by direct integration.Instead, properties provide a simpler method. a) Use Laplace transform properties to expressthe Laplace transform of tx(t) in terms of an unknown q..
If wind power at this site varies as the ratio of heights raised to the 1/7 power, compute the ratio of power in the wind that appears at the tip of the top blade relative to the power that appears at the elevation at the tip of the bottom blades.
If a power supply has a no-load voltage output of 100V and a 96V output under full load, what is the percentage regulation of the supply?
Flip-flops must be in what mode (Set, Reset, Hold, or Toggle) in order to divide a clock's frequency when building a counter What is the advantage of a synchronous counter as compared to a ripple counter
How Automatic UPS system wiring circuit diagram for Home or Office works in both cases when the supply is available and when its not .
U.S. Cenus Bureau statistics show that the annual earnings for persons with a high school diploma are $35,220 versus $57,925 for someone with a bachleor's degree. If the cost of attending college is asumed to be 30,000 per year for 4 years
Using the results of (1) design a resistive network with an equivalent resistance of 3 kohms using 2 resistors with the same value from those: 1k, 1.2k, 1.5k, 1.8k, 2.2k, 2.7k, 3.3k, 3.9k, 4.7k, 5.6k, 6.8k. Find an expression for the equivalent res..
Two resistors are given: R1 = 470 ohms and R2 = 1.20 k ohms. (a) The two resistors are connected in series with a 48 V source. Calculate the series equivalent resistance. Sketch the schematic diagram of the circuit with the two resistors.
the discrete-time systems, where y[n] and x[n] are, respectively the output and the imput sequences, determine whether or not the system is (1) linear, (2) causal, (3) stable, and (4) shift-invariant: y[n] = x[n+3];
Baseball cards are two and a half inches by three and a half inches how many baseball cards. On a bulletin board that is 45 inches long by 36 inches wide
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