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HEAT+MASS TRANSFER:FUND.+APPL.
- 169 g of solid water (i.e. ice), at -17 °C, is placed into a sealed, insulated container with a volume of 0.29 m^3. A 1457 W heater is used to heat and change the phase of the sample until it is a gaseous water (i.e. steam). The heater runs for 433 s. What is the pressure, in kPa, of the gaseous water in the container at the end of the heating process? Round your answer to the first decimal place.arrow_forwardConsider a heat engine with a piston chamber that has a diameter of 30 mm, a cold reservoir at 285 K and hot reservoir at 350 K. It is also equipped with a metal can cylinder that has a volume of 0.0002 m3. How many moles of air are present in the system if the metal cylinder is in the cold tank and the measured pressure and the total air volume are 104160 and 0.00015 m3, respectively?arrow_forward6 In a boiler test, the following observations wcre made: 358 A Text Book of Thermal Engineering Feed water temperaturç e= 12" C; Pressure of steam = 11 bar; Dryness fraction of steam 095 Mass of coal burnt 300 kg/h, Calorific value of coal 32 000 kJkg of coal; Mass of water supplied to boiler in 7 hrs 14 min= 14 625 kg. The mass of w ster in the boiler at the end of the test was less than that at the commencement by 900kg. Calculate I. Actual evaporation per kg of coal: 2 Equivalent evaporation from and at 100 C per kg [Ans. 7 15 kg, 8 33 kg: 58.75 % of coal ; and 3. Thermal efficiency of the boilerarrow_forward
- The heat engine shown in the figure uses 2.0 mol of a monatomic gas as the working substance. (Figure 1) Figure p (kPa) 600 400 200 0 0 ہے۔ 0.025 0.050 -V (m³) 1 of 1 Part A Determine T₁, T2, and T3. Enter your answers numerically separated by commas. Express your answer using two significant figures. T₁, T₂, T3 = Submit Request Answer Part B 17 ΑΣΦ AEth: Ws, Q = Submit Determine AEth, Ws, and Q for 1-2. Enter your answers numerically separated by commas. Express your answer using two significant figures. [VD ΑΣΦ ? Request Answer K ? Jarrow_forwardBenzene at 20 0C is pumped from one storage tank to a reactor (density=878 kg/ m3 ). Volumetric flow rate of benzene is 9.5x 10-4 m3 /s. The difference in the elevations of the two unit is 40m. The tank whichserves as a source is open to the atmosphere while the tank which receives the benzene has a pressure of P2 kPa abs in the vapor space above the benzene. 1‐in, schedule‐40 steel pipe and 2‐in Sch‐40 steel pipe isused in suction and discharge line respectively. Total friction loss of the system given as 135 J/kg . Pressure gauges in the pipeline at the inlet and outlet of the pump read (P3) 34.5kPa and (P4) 1051.6kPa, respectively. Efficiency of pump is %75 a) Calculate the power of pump (kW). (Fluid Mechanics Question) (Please answer it detailed and step by step)arrow_forwardQUESTION 10 Consider a water-to-water counter-flow heat ex-changer with these specifications. Hot water enters at 95 °C while cold water enters at 20 °C. The exit temperature of hot water is 15 °C greater than that of cold water, and the mass flow rate of hot water is 50 percent greater than that of cold water. The product of heat transfer surface area and the overall heat transfer coefficient is 1400 W/m².ºC. Taking the specific heat of both cold and hot water to be Cp = 4180 J/kg.ºC, determine i. the outlet temperature of the cold water, ii. the effective-ness of the heat exchanger, iii. the mass flow rate of the cold water, and iv. the heat transfer rate.arrow_forward
- SOLVE THE PROBLEM AND SHOW THE DETAILED SOLUTION A steam condenser receives 10 kg per second of steam with an enthalpy of 2,570-kJ/kg. The steam condenses into liquid and leaves with an enthalpy of 160kJ/kg. Cooling water passes through the condenser with temperature increases from 13 to 24 Calculate the cooling water flow rate in kg/s.arrow_forwardA classroom type room with 45students taking an exam in thermodynamics is expected to release a body heat of about 8kJ/hr per person. In order to compensate this heat dissipation, an air-conditioning unit is to be installed. If specific heat capacity and density of air is 1.0062kJ/kg-K and 1.2kg/m3, determine the volume of air flow required in examination room if the air is to be cooled down from 290C to 200C. a. 8.5177Li/s b. 9.1262Li/s c. 9.2022Li/s d. 9.0501Li/sarrow_forwardA weighted piston (total masa of 17 kg)., resting on stops in a cylnder (radius of 0.05 m) divides a container into two regions. 0.075 kg of saturated liquid water at 50 Cis contained beneath the piston. The rest of the cylinder and container is evacuated. Heat is applied to the water until the piston is lifted off of the stops and moved a distance () of 0.6 m. As the piston reaches the mouth of the cylinder, the hermetic seal is broken and the cylinder contents can now expand to fil the remainder of the evacuated space. At this instant, no additional heat is added to or removed from the system. When the system fully equilibrates, its absolute pressure is measured to be 0.01 MPa vacuum y -E Cre 20 What is the state of the water when the piston begins to rise off of the stops? ? bị What is the water temperature when the piston reaches the mouth of the cylinder? c) What is the final volume of the water (after the seal is brokenj?arrow_forward
- A tray of liquid water is placed in a freezer where it cools from 20 dgeC to -5 degC. What is the total amount of energy needed to freeze per unit of liquid water? The specific heat of ice is half of the specific heat of liquid water. The latent heat of fusion for water is 335 kJ/kgarrow_forwardquestionsQuestion 1: consider two metal containers (A and B) with different volumes that are very well insulated. Containersit is connected by a small pipe and one valve in the pipe connection between the two tanksis available. Initially with a volume of 0.5 m 'A 1 MPa pressure and a temperature of 409"Cthere is water. B with a volume of 0.6 m and a pressure of 0.1 MPa and 250 ° Cthere is water at the temperature, the valve opens and water flows from container A to container B.The valve is closed when the pressure in Tank A is 0.6 MPa. B what happens in the final state of pressure in container?Draw the system schematically.arrow_forwardDetermine the quantity (volume) of saline water in a steam generator. The heat energy of 1525 kJ is supplied to saline water in the steam generator to heat from 25°C to 114°C for the generation of water vapor, Take the density & specific heat of the solution as 1031 kg/m' & 4.5 J/kg°K respectively. Solution: Change in Temperature (in K) Mass of the saltwater (in kg) Quantity (Volume) of saltwater (in m2) earch 立arrow_forward
- Principles of Heat Transfer (Activate Learning wi...Mechanical EngineeringISBN:9781305387102Author:Kreith, Frank; Manglik, Raj M.Publisher:Cengage Learning