An aluminum bucket contains 0.800 kg of water at an equilibrium temperature of 25.0 °C. The water is cooled uniformly at a constant rate by addition of 200 g of ice at -5.00 °C. Assume no heat exchange to the aluminum bucket and environment. Determine the final temperature (in °C) of the water.
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- A long roll of 2-m-wide and 0.5-cm-thick 1-Mn manganesesteel plate (ρ = 7854 kg/m3 and cp = 0.434 kJ/kg·°C)coming off a furnace at 820°C is to be quenched in an oil bathat 45°C to a temperature of 51.1°C. If the metal sheet is movingat a steady velocity of 10 m/min, determine the requiredrate of heat removal from the oil to keep its temperature constantat 45°C.Determine the quantity (volume) of saline water in a steam generator. The heat energy of 1738 kJ is supplied to saline water in the steam generator to heat from 26ºC to 111ºC for the generation of water vapor, Take the density & specific heat of the solution as 1031 kg/m3 & 3.6 J/kgºK respectively. Solution: Change in Temperature (in K) Answer for part 1 Mass of the saltwater (in kg) Answer for part 2 Quantity (Volume) of saltwater (in m3) Answer for part 3A solution containing 20%(w/w) substance A is cooled prior to process B. The solution leaves an evaporator at a rate of 2000 kg h-1and must be cooled from 90°C to 6°C. Cooling is achieved by heat exchange with 2700 kg h-1water initially at 2°C. If the final temperature of the cooling water is50°C, what is th rate of heat loss from the solution A to the surroundings? Assume the heat capacity of substance A is 0.35 cal g-1C-. asap please
- 3.0 kg of steam at a pressure of 100 kPa are contained in a rigid sealed tank of volume 5.95 m3. The steam begins to cool as heat is transferred to the atmosphere. When the internal pressure reaches 10 kPa, the tank walls will collapse.a) What is the initial temperature of the steam in the tank (in oC)?b) What will the temperature be in the tank when the walls collapse (in oC)?c) Attheinstantofcollapse,whatisthemassofwaterinthevapourandliquidstate (in kg)?d) Deduce the work done for this processA tank containing 100 kg of water. copper tube wound in a coil with 4.0 m length of 15 mm-O.D, 2 mm-wall-thickness, The tank contains a stirrer driven by a small electric motor, and the walls of the tank are well insulated. If the initial temperature of the water is 20°C, A stream of 1 g/s of hydrogen gas at 1 MPa and 80°C is to be cooled, the H2 gas is passed through the coil, will the outlet temperature be less than 28°C after 2 hours of operation?To cool a piece of glass, initially at a temperature of 93°C, it is immersed in an aluminum tray, initially filled (to the brim) with water at 12°C. Assuming that the assembly (tray + water + glass piece) is an isolated system, determine the final temperature of the glass piece. Data:Glass pieceShape: solid parallelepipedDimensions: L = 1.2 m, L = 0.6 m and h = 0.5 mDensity: 2490 kg/m3Constant pressure mass heat: 840 J.kg-1.K-1 Initial temperature: 93°CAluminum trayShape: hollow block without lid External dimensions: L = 2 m, W = 1 m, h = 0.8 m Wall thickness: e = 12 mmDensity: 2800 kg/m3Constant Pressure Mass Heat: 910 J.kg-1.K-1 Initial Temperature: 12°CWaterDensity: 1000 kg/m3Constant pressure mass heat: 4180 J.kg-1.K-1 Initial temperature: 12°C
- THERMOFLUID Air is contained in a cylinder device fitted with a piston-cylinder. The piston initially rests on a set of stops, and a pressure of 200 kPa is required to move the piston. Initially, the air is at 100 kPa and 23°C and occupies a volume of 0.25 m2. Determine the amount of heat transferred to the air, in KJ, while increasing the temperature to 700 K. Assume air has constant specific heats evaluated at 300 K.A 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/s41.394 kg per second of water at 0.03398675 kbarg and internal energy of 15000 kW is heated at constant pressure to saturated vapor and further heated at constant volume process until the pressure is quadrupled. Determine the ratio of the heat added during the constant volume process to the heat added during the constant pressure process. For the steam table, please refer to the green book entitled " Thermodynamic Properties of Water Including Vapor, Liquid, and Solid Phases"
- Water is heated with the aid of a diesel furnace. 2kg of diesel fuel is required for every 300 litres of water. If the heat transfer efficiency is 85%, determine the final temperature of the water. The initial temperature of the water is 200C. assume the calorific heat value of diesel to be 31,5MJ/kg.2) Two glass bulbs, one on the left with a volume of 2 liters and the other on the right with avolume of 6 liters, are connected to one another by a thin tube that is initially closed by astopcock. The bulb on the left has 0.1 moles of ideal gas, and the bulb on the right isevacuated. The system is in thermal equilibrium with the surroundings at 300K. When thestopcock is opened, the gas flows out to fill both bulbs. Calculate A for this process. If wewere to insert a propeller to extract work as the gas flows from left to right, what is themaximum amount of work that we could possibly extract?A mass of 3 kg of saturated liquid-vapor mixture of water is contained in a piston-cylinder device at 200 kPa. Initially, 0.5 kg of water is in the liquid phase and the rest is in the vapor phase. Heat is now transferred to the water, and the piston, which is resting on a set of stops, starts moving when the pressure inside reaches 400 kPA. Heat transfer continues until the total volume increases by 10 percent. Determine (a) the initial and final temperatures, (b) the mass of liquid water when the piston first starts moving, and (c) the work done during this process. Also, show the process on a P−vP-vP−v diagram