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- Which curve has a greater slope, representing an isothermal or adiabatic process. Jusity mathematicallyDraw the PV and TS diagram: Process 1-2: constant volume heat addition Process 2-3: adiabatic expansion Process 3-1: constant pressure heat rejection12. 3 kg of liquid water initially at 12°C is to be heated at 95°C in a teapot equipped with a 1200-W electric heating element inside. The specific heat of water can be taken to be 4.18 kJ/kg · °C, and the heat loss from the water during heating can be neglected. Solve for the time it takes to heat water to the desired temperature. (3 DECIMAL IN FINAL ANSWER PLS)
- THERMOFLUID A student living in a 3-m X 4-m X 4-m dormitory room turns on her 100-W fan before she leaves the room on a summer day, hoping that the room will be cooler when she comes back in the evening. Assuming all the doors and heat trans windows are tightly closed and disregarding any heat fer let through the walls and the windows, determine the temperature in the room when she comes back 8 h later. Use specific heat values at room temperature, and assume room to be at 100 kPa and 20°C in the morning she leaves.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 processquestionsQuestion 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.
- There is saturated water vapor at 135 ° C in an insulated, constant volume closed container. It is cooled until the temperature in the container is 95 ° C. What is the dryness degree of the water vapor at the end of the process? A) 0,67 B) 0,29 C) 0,71 D) 0,51 E) 0,08A mass of ice at -7 C is needed to cool 224 kg of vegetables (Cp = 3.35 KJ /kg.K )in a bunker for 24 hours. The initial temperature of the vegetables is assumed to be 29 C . It is also assumed that the average temperature in the bunker is 7C within the 24 -hour period . If the heat gained per hour in the bunker is 25% of the heat removed to the vegetables from 29 C to 7C, what would be the required mass of ice ? show t-s diagramThe fluid is heated from 125 degrees Fahrenheit to 225 degrees Fahrenheit. Consider an ideal gas with the following characteristics: R = 85 ft-lbf/lbm-R Cp = 0.35 + 0.000325T BTU/lbm-R If the heating is at constant pressure, (e) the value of k at 160 degrees Celsius. If the fluid undergoes an isentropic process, determine (f) non-flow work and (g) steady-flow work. (For item f and g, use the value of k at 160 degrees Celsius).
- 3. A classroom that normally contains 40 people is to be air-conditioned with window air-conditioning units of 5-kW cooling capacity. A person at rest may be assumed to dissipate heat at a rate of about 360 kJ/h. There are 10 light bulbs in the room, each with a rating of 100 W. The rate of heat transfer to the classroom through the walls and the windows is estimated to be 15,000 kJ/h. If the room air is to be maintained at a constant temperature of 210C, determine the number of window air-conditioning units required. draw a figure also, and explain each step by step solution.A passive solar house that is losing heat to the outdoors at an average rate of 50,000 kJ/h is maintained at 22°C at all times during a winter night for 10 h. The house is to be heated by 50 glass containers each containing 20 L of water that is heated to 80°C during the day by absorbing solar energy. A thermostat-controlled 15-kW back-up electric resistance heater turns on whenever necessary to keep the house at 22°C. (a) How long did the electric heating system run that night? (b) How long would the electric heater run that night if the house incorporated no solar heating?3. A lumped system with a volume of 0.003 m³ and a surface area of 0.08 m² is made of a material with density of 3800 kg/m³, thermal conductivity of 300 W/m K, and specific heat of 200 J/kg K. If the system is exposed to a convection environment with h = 60 W/m2 K, what is the approximate time it will take for this system to reach equilibrium with the environment? Express your answer in minutes.