A small manufacturing process consists of 2 single machine workstations as pictured below.Workstation 1Workstation 2The warehouse management system has collected data and the summary statistics computed.The average arrival rate to this process is 15 jobs and hour and the coefficient of variation of theinter-arrival times is 0.8. Workstation statistics are found in the following table:w/s 1w/s 23.75Average effective processing time (min)CV of processing times3.51.01.5What is the average time between job arrivals to w/s 2? What is the CV of these times?Compute the following:Average time jobs spend waiting in w/s 1Average time it takes to process a job in w/s 1Average time jobs spend waiting in w/s 2Average time it takes to process a job in w/s 2What is the average WIP in the entire system?

A small manufacturing process consists of 2 single machine workstations as pictured below. Workstation 1 Workstation 2 The warehouse management system has collected data and the summary statistics computed. The average arrival rate to this process is 15 jobs and hour and the coefficient of variation of the inter-arrival times is 0.8. Workstation statistics are found in the following table: w/s 1 w/s 2 3.75 1.5 Average effective processing time (min) CV of processing times What is the average time between job arrivals to w/s 2? What is the CV of these times? Compute the following: Average time jobs spend waiting in w/s 1 • Average time it takes to process a job in w/s 1 Average time jobs spend waiting in w/s 2 Average time it takes to process a job in w/s 2 What is the average WIP in the entire system? 3.5 1.0

A small manufacturing process consists of 2 single machine workstations as pictured below. Workstation 1 Workstation 2 The warehouse management system has collected data and the summary statistics computed. The average arrival rate to this process is 15 jobs and hour and the coefficient of variation of the inter-arrival times is 0.8. Workstation statistics are found in the following table: w/s 1 w/s 2 3.75 1.5 Average effective processing time (min) CV of processing times What is the average time between job arrivals to w/s 2? What is the CV of these times? Compute the following: Average time jobs spend waiting in w/s 1 • Average time it takes to process a job in w/s 1 Average time jobs spend waiting in w/s 2 Average time it takes to process a job in w/s 2 What is the average WIP in the entire system? 3.5 1.0

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter1: Basic Modes Of Heat Transfer

Section: Chapter Questions

Problem 1.23P: Using the information in Problem 1.22, estimate the ambient air temperature that could cause...

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Using the information in Problem 1.22, estimate the ambient air temperature that could cause frostbite on a calm day on the ski slopes. 1.22 In order to prevent frostbite to skiers on chair lifts, the weather report at most ski areas gives both an air temperature and the wind-chill temperature. The air temperature is measured with a thermometer that is not affected by the wind. However, the rate of heat loss from the skier increases with wind velocity, and the wind-chill temperature is the temperature that would result in the same rate of heat loss in still air as occurs at the measured air temperature with the existing wind. Suppose that the inner temperature of a 3-mm-thick layer of skin with a thermal conductivity of 0.35W/mKis35C and the air temperature is 20C. Under calm ambient conditions the heat transfer coefficient at the outer skin surface is about 20W/m2K (see Table 1.4), but in a 40-mph wind it increases to 75W/m2K. If frostbite occurs when the skin temperature drops to about 10C, do you advise the skier to wear a face mask? What is the skin temperature drop due to the wind?
To determine the thermal conductivity of a structural material, a large 15-cm-thick slab of the material is subjected to a uniform heat flux of 2500 W/m2 while thermocouples embedded in the wall at 2.5 cm. intervals are read over a period of time. After the system had reached equilibrium, an operator recorded the thermocouple readings shown below for two different environmental conditions: Distance from the Surface (cm) Temperature (C) Test 1 0 40 5 65 10 97 15 132 Test 2 0 95 5 130 10 168 15 208 From these data, determine an approximate expression for the thermal conductivity as a function of temperature between 40 and 208C.
1.22 In order to prevent frostbite to skiers on chair lifts, the weather report at most ski areas gives both an air temperature and the wind-chill temperature. The air temperature is measured with a thermometer that is not affected by the wind. However, the rate of heat loss from the skier increases with wind velocity, and the wind-chill temperature is the temperature that would result in the same rate of heat loss in still air as occurs at the measured air temperature with the existing wind. Suppose that the inner temperature of a 3-mm-thick layer of skin with a thermal conductivity of 0.35 W/m K is and the air temperature is . Under calm ambient conditions the heat transfer coefficient at the outer skin surface is about (see Table 1.4), but in a 40-mph wind it increases to . (a) If frostbite occurs when the skin temperature drops to about , do you advise the skier to wear a face mask? (b) What is the skin temperature drop due to the wind?
1.77 Explain each in your own words. (a) What is the mode of heat transfer through a large steel plate that has its surfaces at specified temperatures? (b) What are the modes when the temperature on one surface of the steel plate is not specified, but the surface is exposed to a fluid at a specified temperature?
A free-falling object such as a bungee jumper is subject to the upward force of air resistance. We assumed that this force was proportional to some power b of velocity as in FU=CdVb where FU = the upward force of air resistance [N = kg m/s2 ], Cd = drag coefficient (kg/m), and V = velocity [m/s]. An individual is suspended in a wind tunnel and the force measured for various levels of wind velocity. The result might be as listed in Table 1
The data listed below is from a passenger hot air balloon. The balloon is designed to lift 10-people (80 kg each person). The balloon consists of a basket, a burner- propane tank system. It will lift up when the cold air trapped inside warms up by the burner. Density of air inside the balloon is 99°C: 0.9486 kg/m³, density of air outside balloon is 20°C (ambient): 1.2041 kg/m³ Mass (kg) Balloon Basket Burner Propane tank 113.4 kg 63.5 kg 22.7 kg 183.7 kg Assume the balloon is a sphere shape, volume =(4/3)pi R3. a. Determine the minimum diameter of the balloon that would have a total lifting force to balance the weight of balloon, basket, burner, propane tank and 10 people? b. If the balloon is converted to survey the weather, it will be filled with hydrogen gas (H2). Assume the weight of the people (800kg) is now replaced by onboard equipment, what is minimum diameter needed to keep it afloat at 18km above the surface of the earth?
A wind turbine has the maximum power output at the rated speed of 12 m/s and a rotor diameter of 82 meters. The cut-in and cut-out speeds for this type of wind turbine are 4 m/s and 23 m/s, respectively. The table below shows the annual wind data near a potential site for setting up a wind farm using this type of wind turbine and the power coefficient of the wind turbine at the specific wind speed. The air density is 1.22 kg/m3. (a). What is the maximum power output of this wind turbine, assuming Betz limit? (b). What is the average power output if the wind turbine is installed at this site?. (c). What is the capacity factor of the wind turbine at this site? (d). If a wind farm consisting of 100 such wind turbines is built at the site, how much energy does this wind farm generate in a year (in the unit of kWh)? (e). Is this a good site for using this particular type of wind turbine?
Suppose city 1 leaves an entire block (100 mm ×× 100 mm) as a park with trees and grass (emissivity 0.96) while city 2 paves the same area over with asphalt (emissivity 1.0). Sunlight heats each surface to 41.5 ∘C∘C by sunset, and then the surface radiates its heat into a cube of air 100 mm on a side and at 30.0 ∘C∘C. If each city block maintains the same radiated power for 2.1 hh and there are no other energy losses, what is the final temperature of the cube of air above the block in city 1? The density of air at 30.0 ∘C∘C is 1.16 kg/m3kg/m3. Express your answer to three significant figures and include appropriate units. If each city block maintains the same radiated power for 2.1 hh and there are no other energy losses, what is the final temperature of the cube of air above the block in city 2? The density of air at 30.0 ∘C∘C is 1.16 kg/m3kg/m3. Express your answer to three significant figures and include appropriate units.
A work group of 5 workers in a certainmonth produced 500 units of output working 8hr/day for 22 days in the month. (a) Whatproductivity measures could be used for thissituation, and what are the values of theirrespective productivity ratios? hint (moth, day,and hours) (b) Suppose that in the next month,the same work group produced 600 units butthere were only 20 workdays in the month.Using the same productivity measures asbefore, determine the productivity index usingthe prior month as a base.
1. Residual oil, with a heating value of 18,480 BTU/bm, is used as a fuel in a power plant which produces 947,870 BTU/s of electricity. The overall efficiency of the power plant is 52 Determine the: a. Heat input, in BTUs b. Daily fuel consumption, in lbm C. Dimensions of the cylindrical storage (assuming length is equal to the diameter), in ft. d. Heat rejected the environment, in BTU/s. The density of the oil is 62 ID/ft.
In the United States, energy for household heating is generally sold using English units, e.g., therm, gal, and cord. A house in Wisconsin uses 1200 therms of thermal energy during the heating season. Calculate the cost of fuel if the furnace uses (a) natural gas with an efficiency of 70%; (b) No. 2 fuel oil, efficiency 65%; (c) kerosene, efficiency 99.9% (unvented); and (d) wood with l5% moisture with an efficiency of 50%. Use the data in Tables 2.2, 2.7, and 2.13. The efficiencies are based on the HHV. Assume the cost of natural gas is $8/MBtu, the cost of No. 2 fuel oil is $3/gal, the cost of kerosene is $3.50/gal, and the cost of wood is $100/cord. Assume the bulk density of cord wood is 30 lbm/ft3 .
I need help solving for the solutions. A closed system undergoes a cycle consisting of 3 processed. Fill in the table below with the missing data: Process Q(kJ) W(kJ) ΔE (kJ) 1-2 500 0 2-3 0 200 3-1 -400 Net