TASK# 1. Solve problems involving heat transfer by convection processes. Problem Solving Instructions: Analyze and solve the following problems. Enclose your final answer in a box. In a hot air heating system, the furnace heats air from 66°F to 120°F. If the air is then circulated at the rate of 510 ft³/min by the blower, how much thermal energy is transferred per hour? 1. Note: the specific heat of air at constant pressure is 0.250 Btu/lb°F, the density of air is 0.0806 lb/ft³ at atmospheric pressure. 2. Calculate the quantity of heat in kJ to be transferred to 9.5 lb of brass to raise its temperature from 30°C to 485°F taking the specific heat of the brass as 0.394 kJ/kg- К. 3. At an average temperature of 212°F, hot air flows through a 9 ft long tube with an inside diameter of 55 mm. The temperature of the tube is 70°F along its entire length. Convective film coefficient is 20.1 W/m²-K. Determine the convective heat transfer from air to tube. Brine enters a cooler at a rate of 58 m /hr at 63°F and leaves at 1°C. Specific heat and specific gravity of brine are 1.117 kJ/kg-Kand 1.5 respectively. Calculate the 4. heat transferred in kW. 5. For heat transfer purposes, a standing man can be modeled as a 30 cm diameter, 170 cm long vertical cylinder with both the top and bottom surfaces insulated and with the side surface at an average temperature of 34°C. For a convection heat transfer coefficient of 15 W/m2 -°C, determine the rate of heat loss from this man by convection in an environment at 20°C.

Q2/A) The system is shown in the next page: 1. Find the value of (m) when the damping ratio () is (0.7). Then obtain the maximum over shoot, peak time, rise time, and settling time. 2. Determine (on) and (C) when (m) equal zero. 3. Calculate the value of steady state error for this system if the input is a unit ramp. X(s) 250 Y(s) S(S+10) 3m S + 1

One of the primary functions of engineers is making capital-budgetingdecisions.True or false?

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