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Chapter 1 Solutions
Introduction to Heat Transfer
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- Q (16)A constant area combustion chamber is supplied by air at 223k and 70kpa the air stream velocity is 130 m/s. Determine (M₁, To2, T2, P2) if heat of 140 Kw/Kg is added in the combustion process and the chamber handles the maximum possible amount of air see figure: (2) Combustion chamber Q=140 KWarrow_forward45. A saturated steam at 410K is being transported in a pipeline (brass drawing tubing) at a rate of 1 grams/second. Pipe has inside diameter of 0.025 m. The tube is 100m long. The pressure at the entrance is 80kPa. It will under compressible or incompressible criteria. (use Perry's Handbook for the properties and constants) R = 8314J/kgmol.K; MW=18.02g/mol * Mark only one oval. Compressible Incompressiblearrow_forwardK2 please help with my reviewer. Provide me the full solution and answer thank you SN=40arrow_forward
- Q6//(14 Marks) In a boiler trail of one hour duration the following observations were made: Steam generated =5250 kg, coal burnt = 695 kg, calorific value of coal 30200 kJ/kg, dryness fraction of %3D steam =0.94, pressure of the boiler = 15 bar, temperature of steam leaving the super heater =400°C, temperature of feed water = 80°C. Calculate: (a) Thermal efficiency of the boiler without super heater. (b) Thermal efficiency of the boiler with super heater. Ans(58%;73%)arrow_forwardA heat exchanger, shown below, is used to cool an air flow from 550 K to 250 K, both states at 1 MPa. The coolant is a water flow at 30 °C, 0.1 MPa. If the water leaves as saturated vapor, 0.1 MPa. 1 air 3 water The initial state enthalpy for air (h;(kJ/kg)) is equal to: The final state enthalpy for air (h2(kJ/kg)) is equal to: The initial state enthalpy for water (h3(kJ/kg)) is equal to: The final state enthalpy for water (ha(kJ/kg)) is equal to: Mµ20/Mair| The ratio of the flow ratesarrow_forwardSN = 9 X = 20arrow_forward
- A factory uses superheated steam (P = 15 bar, T = 250 oC) for heating purposes of 20,000 tons/month. Steam is made in a boiler-furnace using 2 (two) types of fuel, namely coal fuel (LHV = 5500 kcal/kg) and heavy fuel oil (137129 Btu/ft3, density = 0.98 m3/kg) Question: a. How much coal fuel is needed to produce steam with the above specifications if the overall efficiency of the system (boiler-furnace = 75%)! b. How much heavy fuel oil is needed to produce steam with the above specifications (boiler-furnace = 75%)! answer every month... Help pleasee.. fast pleasearrow_forward(a) An Ocean Thermal Energy Converter (OTEC) pumps 200 m^3/s through a heat exchanger in which the temperature (expressed in Kelvins) drops by 1%. All the heat extracted is delivered to the ammonia boiler [11. The ammonia temperature. THT at turbine inlet is equal to the mean temperature of the water in the warm water heat exchanger minus 1 °K. The temperature, TCT, of the ammonia leaving the turbine is kept at 10 °C by the cooling effect of 250 m³/s of cold water. The efficiency of turbine/generator system is 90% of the Carnot efficiency of a heat engine working between THT and TCT . 12 MW of the produced electricity is used for pumping. Heat capacity of water is 4.2 MJ m³ K-1. Calculate the intake temperature of the warm water for the following cases: i) A total of 20 MW of electricity is available for sale? ii) The OTEC produces exactly equal to the amount of power needed for pumping?arrow_forwardPlease use Book: Introduction to Chemical Engineering Thermodynamics 8 edition, 2018 (Smith, J.M., Van Ness, H.C., Abbot, M.M., Swihart.)arrow_forward
- I need help with some review problemsfor thermo! thank you Air at 100 kPa and 280K is compressed steadily to 600 kPa and 400K in an air compressor. The mass flow rate of air through the compressor is 0.02 kg/s and the compressor a heat loss of 16 kJ/kg from the compressor occurs. Assuming steady state steady flow conditions and ideal gas behavior (with constant specific heats, Cp=1.009 kJ/kgK, R=0.287 kJ/kgK, determine: a)The necessary power input to the compressor (kW).b)The volumetric flow rate of air at the exit of the compressor (m3/s).arrow_forwardWet saturated steam (x = 94.305 %) at 16 bar (hf = 859 kJ/kg, hfg = 1935 kJ/kg) reducing valve is throttled at a pressure of 8 bar (hf = 721 kJ/kg, hfg = 2048 kJ/kg). Determine the dryness fraction of the reduced pressure steam in %. If the steam table is needed, please use the green book entitled "Thermodynamics Properties of Water Including Vapor, Liquid, and Solid Phases" by Keenan, Keyes, Hill, and Moore.arrow_forward#2 Separate streams of steam and air flow through the turbine and heat exchanger arrangement shown in the figure below, where the air stream mass rate m'5 ranges from 1500 kg/min to 3500 kg/min in increments of 500 kg/min and Wt1= 10,000 kW,. Steady-state operating data are provided on the figure. Heat transfer with the surroundings can be neglected, as can all kinetic and potential energy effects. Steam in 1500 kg/min 2000 kg/min 2500 kg/min Mass Rate of Air M5 in kg/min 3000 kg/min 3500 kg/min Turbine T₁ = 600°C P₁ = 20 bar W₁ T3 T₂=400°C P2 10 bar Temperature T6 = 1200 K P6 = 1 bar tmt tm Heat exchanger TWO TURBINE PROBLEM Py = 10 bar T3 = ? Analyze the two-compressor system for different air mass flow rates into the heat exchanger. Provide clearly detailed professional written sample of the calculations needed to analyze each component of the system and the overall system. Complete the following table and plot the mass of air M5 against the Temperate T3, plot the mass rate M5…arrow_forward
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