6) The cooling water from the condenser of a power plant enters a wet cooling tower at 35°C at a rate of 120 kg/s. The water is cooled to 25°C in the cooling tower by air that enters the tower at 1atm, 20°C, and 50% relative humidity and leaves saturated at 30°C. Neglecting the power input to the fan, determine a) the volume flow rate of air into the cooling tower and b) the mass flow rate of the required makeup water. Air exit Warm water Cool water 4 3 1111 2 Fan AAAAAA 1 Air inlet

6) The cooling water from the condenser of a power plant enters a wet cooling tower at 35°C at a rate of 120 kg/s. The water is cooled to 25°C in the cooling tower by air that enters the tower at 1atm, 20°C, and 50% relative humidity and leaves saturated at 30°C. Neglecting the power input to the fan, determine a) the volume flow rate of air into the cooling tower and b) the mass flow rate of the required makeup water. Air exit Warm water Cool water 4 3 1111 2 Fan AAAAAA 1 Air inlet

Practical Management Science

6th Edition

ISBN:9781337406659

Author:WINSTON, Wayne L.

Publisher:WINSTON, Wayne L.

Chapter10: Introduction To Simulation Modeling

Section: Chapter Questions

Problem 41P: At the beginning of each week, a machine is in one of four conditions: 1 = excellent; 2 = good; 3 =...

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At the beginning of each week, a machine is in one of four conditions: 1 = excellent; 2 = good; 3 = average; 4 = bad. The weekly revenue earned by a machine in state 1, 2, 3, or 4 is 100, 90, 50, or 10, respectively. After observing the condition of the machine at the beginning of the week, the company has the option, for a cost of 200, of instantaneously replacing the machine with an excellent machine. The quality of the machine deteriorates over time, as shown in the file P10 41.xlsx. Four maintenance policies are under consideration: Policy 1: Never replace a machine. Policy 2: Immediately replace a bad machine. Policy 3: Immediately replace a bad or average machine. Policy 4: Immediately replace a bad, average, or good machine. Simulate each of these policies for 50 weeks (using at least 250 iterations each) to determine the policy that maximizes expected weekly profit. Assume that the machine at the beginning of week 1 is excellent.
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Consider the mixing process shown in the figure. A mixing chamber initially contains 4 liters of a clear liquid. Clear liquid flows into the chamber at a rate of 10 liters per minute. A dye solution having a concentration of 0.25 kilograms per liter is injected into the mixing chamber at a constant rate of liters per minute. When the mixing process is started, the well-stirred mixture is pumped from the chamber at a rate of 10 + r liters per minute. (a) Develop a mathematical model for the mixing process. Let Q represent the amount of dye in kilograms in the mixture. (dQ/dt)=? (b) The objective is to obtain a dye concentration in the outflow mixture of 0.1 kilograms per liter. What injection rate r is required to achieve this equilibrium solution? r = ? Would this equilibrium value of r be different if the fluid in the chamber at time t=0 contained some dye? yes, no or maybe? (c) Assume the mixing chamber contains 4 liters of clear liquid at time t. How many minutes will it take…