A 1.8 kg/s of steam expands in a turbine producing 550 kw of power output. The steam enters at a velocity of 18 m/s and exits at 70 m/s. The reduction of specific enthalpy is 400 kJ/kg. Determine that the heat flow per second when the inlet of the turbine is located 900 mm above the outlet.
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- Hello! I'd like help with the following exercise, from Levenspiel's "Engineering Flow and Heat Exchange". Leftover air at 20ºC and 100kPa is driven by a fan through a horizontal galvanized conduit of 1 m in diameter and 10m in length at a speed of 10 m/s. What size motor should be used if its efficiency is 90% and that of the fan is 20%? I'm not sure where to start. My professor hasn't explained much about this subject.For an exhaust valve, the mass flow rate through the valve is 1.26 kg/s. The flow coefficient is 0.65 and the cylinder pressure and temperature are 625 kPa and 820 K. Assume exhaust system pressure is 103 kPa, the specific heat ratio is 1.4 and R =287J/ kg.K. The effective area of the valve is (SI unit): Select one: O a. 3.45*10-2 O b. 0.85*10-2 O c. 2.2*10-3 O d. 1.85*10-3 O e. 1.42*10-3The maximum velocity of an air flow (v= 700 ms-1 and T=160 oC
- Water with a specific heat of 1 BTU/lbmoF is pumped using a 1-hp jet pump from a well that is 20 ft deep into a vented water vessel 160 ft above the ground. In the process, 400 BTU/min of heat is lost from the system. What is the temperature (oF) of the water as it enters the vessel if the flow rate of the water is 5 gal/min? Assume the temperature of water in the well is (35oF).Identify what is the system in this problem and write the general energy balance equation (no need to solve) A turbine is driven by a system that enters the turbine at the ff. conditions: 200 kg/h, 39 atm, 501 deg C, 49 m/s linear speed. The steam exits at a point 8 meters below the inlet stream of the turbine with the following conditions: atmospheric pressure, 290 m/s speed. 69000 W of shft work is delivered by the turbine while 100 kcal/h heat is lost. What is the specific delta H?Your second customer wants to determine the required electrical power, which will be used to pump waterwith the following design specifications: The pump loses 3 kW in the form of heat to its surrounding. The inlet and the exit conditions of the water are as indicated in Figure 2. The pipe diameter is 5 cm. P2 = 150 kPa V2= 1 m/s Zz= 105 m Q - 3 kW Motor Welectrical | Water P:= 100 kPa O Vi= 1 m/s Zı= 5 m Figure 2: Schematic for task 2. You must follow the following parts to do your task: Part 1 Derive the steady flow energy equation (SFEE) from the first principles. You are required to show all the steps in deriving the SFEE and using both the principles of mass and energy conversation. Part 2 Produce specific steady state energy equation (SFEE) by stating all the stated assumption in this equipment in order to be used in later stages without further analysis. Then calculate the pump power.
- Your second customer wants to determine the required electrical power, which will be used to pump water with the following design specifications: - The pump loses 3 kW in the form of heat to its surrounding. The inlet and the exit conditions of the water are as indicated in Figure 2. The pipe diameter is 5 cm.2nd Quiz: (Answer only one question of the following two questions) Q1) Find: (a) inlet temperature (T1 =?), (b) mass flow rate of R-134a (m =?), (c) exit diameter (D2 =?), (d) the rate of heat transferred to the surroundings (Qout =? ). P2 = 1MPA T2 = 70°C m Y2 = 70 = Compressor W in = 100 (W) R-134a P = 500KP. Qout (sat. vapor)(1) m. Y1 = 20 () D = 0.5 (cm)Given • 1 million people in Hong Kong using low-flush toilet and low-flow shower head.• 1 million leaky toilet and Faucet. Energy needed to treat waterAverage energy use for water treatment drawn from southern California studies is 652 kWh per acre-foot (AF), where one AF = 325,853 gallons.Thermal Energy in CoalThe thermal power plants consume about 0.45 kg of coal per kWh.Energy output/fire power plantA typical 500 megawatt coal power plant produces 3.5 billion kWh per year.CO2 EmissionTaking coal to contain 50 percent carbon, which combines with oxygen during burning to form CO2, we can arrive at 1.83 kg CO2 for every 1 kg of coal burned. Find 4. How many African children (1 liter/kid/day) we can support?
- Given • 1 million people in Hong Kong using low-flush toilet and low-flow shower head.• 1 million leaky toilet and Faucet. Energy needed to treat waterAverage energy use for water treatment drawn from southern California studies is 652 kWh per acre-foot (AF), where one AF = 325,853 gallons.Thermal Energy in CoalThe thermal power plants consume about 0.45 kg of coal per kWh.Energy output/fire power plantA typical 500 megawatt coal power plant produces 3.5 billion kWh per year.CO2 EmissionTaking coal to contain 50 percent carbon, which combines with oxygen during burning to form CO2, we can arrive at 1.83 kg CO2 for every 1 kg of coal burned. Find 3. How much CO2 we can reduce?Given • 1 million people in Hong Kong using low-flush toilet and low-flow shower head.• 1 million leaky toilet and Faucet. Energy needed to treat waterAverage energy use for water treatment drawn from southern California studies is 652 kWh per acre-foot (AF), where one AF = 325,853 gallons.Thermal Energy in CoalThe thermal power plants consume about 0.45 kg of coal per kWh.Energy output/fire power plantA typical 500 megawatt coal power plant produces 3.5 billion kWh per year.CO2 EmissionTaking coal to contain 50 percent carbon, which combines with oxygen during burning to form CO2, we can arrive at 1.83 kg CO2 for every 1 kg of coal burned. Find 2. How much coal (Kg) we can save?Given• 1 million people in Hong Kong using low-flush toilet and low-flow shower head.• 1 million leaky toilet and Faucet. Energy needed to treat waterAverage energy use for water treatment drawn from southern California studies is 652 kWh per acre-foot (AF), where one AF = 325,853 gallons.Thermal Energy in CoalThe thermal power plants consume about 0.45 kg of coal per kWh.Energy output/fire power plantA typical 500 megawatt coal power plant produces 3.5 billion kWh per year.CO2 EmissionTaking coal to contain 50 percent carbon, which combines with oxygen during burning to form CO2, we can arrive at 1.83 kg CO2 for every 1 kg of coal burned. Find1. How much energy we can save?