# ass3 - ENGRD 221 ENGINEERING THERMODYNAMICS Problem Set 3...

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ENGRD 221: E NGINEERING T HERMODYNAMICS Problem Set 3 Due: Feb 13 th 2009, Upson Room 123 (5 Questions) Question 1 (4.8): A carburetor in an internal combustion engine mixes air with fuel to achieve a combustible mixture in which the air-to-fuel ratio is 20kg (air) per kg (fuel). For a fuel mass flow rate of 5×10 -3 kg/s, determine the mass flow rate of the mixture, in kg/s. Question 2 (4.19): Figure 1 shows a cooling tower operating at steady state. Warm water from an air conditioning unit enters at 120 o F with a mass flow rate of 4000 lb/h. Dry air enters the tower at 70 o F, 1 atm with a volumetric flow rate of 3000 ft 3 /min. Because of evaporation within the tower, humid air exits at the top of the tower with a mass flow rate of 14,000 lb/h. Cooled liquid water is collected at the bottom of the tower for return to the air conditioning unit together with makeup water. Determine the mass flow rate of the makeup water, in lb/h. Figure 1

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ass3 - ENGRD 221 ENGINEERING THERMODYNAMICS Problem Set 3...

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