A hot dog can be considered to be a cylinder 5 in long and 0.8 in in diameter whose properties
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HEAT+MASS TRANSFER:FUND.+APPL.
- 3. A room is to be heated by 1000 kg of a liquid contained in a tank placed in the room. The room is not well insulated and loses 192, 000 kJ of heat to the outside. The room is kept at a constant temperature of 20°C. If the final temperature of the liquid is 25°C, determine its initial temperature. If needed use: For the liquid Cp= 4 kJ/kg.K For Air: R=0.287 kJ/kg.K liquid tank C₂ = 0.718 kJ/kg.K 192,000 kJ C₂ = 1.005 kJ/kg.Karrow_forwardSection F Type your answer. A sealed rig (1 m3) contains 2 kg of water (liquid PLUS vapour) at 20°C. The rig is heated until the temperature inside is 95°C. Calculate: 44 The quality of steam at 95°C. (%) Type your answer. Тур 1 45 Internal energy at 20°C. (kJ/kg) Type your answer. 46 Internal energy at 95°C. (kJ/kg) Type your answer.arrow_forwardA frictionless piston fitted inside a cylinder containing gas at a pressure of 200 kPa, volume of 1 litre and temperature of 25 °C. Carbon monoxide is to be compressed in the system and the final volume is 0.5 litre. Work is done to move the piston and heat is transferred to the cooling system around the cylinder. Illustrate the importance of expressions for work done in a thermodynamic process by applying the first principles while calculating the work done when the expansion is ADIABATIC, ISOTHERMAL and POLYTROPIC for n=1.5.arrow_forward
- Five kilograms of water in saturated liquid state at 200 kPa (vf=0.00106 m3 /kg, uf=540.0 kJ/kg, hf=505.0 kJ/kg) is heated under constant pressure process until its temperature reaches 400 degrees celcius (v=1.5493 m3/kg, u=2976.0 kJ/kg, h=3277.0 kJ/kg). Solve for the heat added (in Btu) in the processarrow_forwardAs shown in the figure below, you have a system including a Polyethylene vessel with mass Myessel = 0.229 kg. The vessel contains water with mass Mwater = 0.399 kg. Both the vessel and water are initially at a temperature of 54.6 degrees Celsius. You add steam into the system. The steam has an initial temperature of 167.4 degrees Celsius and a mass of Msteam = 10.9564 kg. The system will reach equilibrium with all the water having vaporized at some final temperature above 100 degrees Celsius. Steam water Pressure Vessel Find the system final temperature, Tfinal = Material c (J/(kg K)) Aluminum 897 1820 Beryllium Cadmium Iron Lead 129 Polyethylene 2303 Steel 466 Uranium 116 231 412 All of the water turns to steam. The system reaches equilibrium at T > 100° C Water c (J/(kg K)) ice 2090 4186 2010 water steam degrees Celsius Water L (J/kg) 334000 Fusion Vaporization 2230000arrow_forwarda) A basement refrigerator is used to store cool beverages during the long hot summer. The refrigerator is maintained at 2°C and the ambient basement temperature is 20°C. Glass bottles filled with cola at 25°C are placed in the refrigerator. Each bottle weighs 0.20 kg and there is 0.25 kg of cola in each bottle. Assume the glass bottles are in thermal equilibrium with the cola at all times (i.e. the temperature of the bottles and cola are equal). The available energy (work) to cool the bottles of cola in the refrigerator space is 110 kJ. The coefficient of performance of the refrigerator is 0.20 % of that of a Carnot refrigerator. Assume the bottle has the properties of plate glass, and the cola has the properties of saturated liquid water. How many bottles containing cola can be placed in the refrigerator and cooled to 2°C? b) Define the reversible (Q /Q.)rev ratio in terms of TH and T. Prove that the coefficient of performance of a reversible heat pump () TH TH-TL" revarrow_forward
- The initial state of 1.00 mol of a dilute gas is P1 = 3.00 atm, V1 = 1.00 L, and Eint 1 = 456 J and its final state is P2 = 2.00 atm, V2 = 3.00 L, and Eint2 = 912 J. The gas is first cooled at constant volume until it reaches its final pressure. It is then allowed to expand at constant pressure until it reaches its final volume. (a) Illustrate this process on a PV diagram and calculate the work done by the gas. (b) Find the heat absorbed by the gas during this process.arrow_forward1. A room is filled with saturated steam at 100°C. Now a 5-kg bowling ball at 25°C is brought to the room. Heat is transferred to the ball from the steam, and the temperature of the ball rises to 100°C while some steam condenses on the ball as it loses heat (but it still remains at 100°C). The specific heat of the ball can be taken to be 1.8 kJ/kg · C. Solve for the mass of steam that condensed during this process. (3 DECIMAL IN FINAL ANSWER PLS)arrow_forwardFill in the blanks: Magnolia Dairy product must cool 4000 gallons of fresh milk from the farm from an initial temperature of 80°F to a temperature of 38°F in 5 hours. If the density of the milk is 8.6 lb/gal, sg 1.03 and Cp = 0.935 BTU/lb-R, how much brine must be circulated in gpm, if the change in temperature of brine is 15F°, sg = 1.182 and Cp = 0.729 BTU/lb-R? %3D gpmarrow_forward
- A well insulated piston-cylinder assembly contains one mole of ideal gas. There are two 3000 kg blocks on this well insulated 0.04 m2 piston. Its starting temperature is 600 K and ambient pressure is 4 bar. The gas is compressed by adding another 3000 kg block. Fixed volume heat capacity is given as (5/2) R. (a) What are the initial and final pressures of the gas in the system?(b) Is the temperature expected to rise or fall? Explain.(c) What is the end temperature?(d) Calculate the values of ∆Ssis and ∆Sis.(e) Does this process violate the second law of thermodynamics? Explain.arrow_forward7. During a picnic on a hot summer day, all the cold drinks disappeared quickly, and the only available drinks were those at the ambient temperature of 85°F. In an effort to cool a 12-fluid-oz drink in a can, a person grabs the can and starts shaking it in the iced water of the chest at 32oF. Using the properties of water for the drink, determine the mass of ice that will melt by the time the canned drink cools to 37°F. Draw a figure or FBD that will support the problem. Explain each step by step formula.arrow_forwardThis example focuses on thermodynamicsarrow_forward
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