FIRST LAW OF THERMODYNAMICS11. A vertical piston-cylinder device contains water and is being heated on top of a range.During the process, 65 Btu of heat is transferred to the water and heat losses from the sidewalls amount to 8 Btu. The piston rises as a result of evaporation, and 5 Btu of work is doneby the vapor. Determine the change in the energy of the water for this process.

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Answered: A vertical piston-cylinder device…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

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Refrigerant 134a expands in a piston–cylinder assembly from p1 = 140 lbf/in2 and T1 = 140°F to p2 = 30 lbf/in2 and T2 = 80 oF. The mass of refrigerant is 0.46 lb. During the process, the work done by the refrigerant is 4.32 Btu. Kinetic and potential energy effects are negligible. Determine the initial volume of the refrigerant, V1, in ft3, and the heat transfer for the process, in Btu.
As shown in the figure below, Refrigerant 134a is contained in a piston-cylinder assembly, initially as saturated vapor. The refrigerant is slowly heated until its temperature is 155°C. During the process, the piston moves smoothly in the cylinder. For the refrigerant, evaluate the work, in kJ/kg. W/m = i kJ/kg. Patm = 1 bar Piston Refrigerant 134a imma - Weight=471.1 N D = 0.02 m Initial: Saturated vapor Final: T₂
Thermodynamics: A rigid cylinder is filled with refrigerant-134a at 18°C. At this state, 40 percent of the mass is vapor. A valve at the bottom is opened, and refrigerant is withdrawn outside.Heat is transferred to the tank such that the temperature in the tank remains constant and the refrigerant fills the tank all the time (V1= V2). Determine the amount of heat that must be transferred by the time one-fourth of the total mass has been withdrawn. The tank volume is 0.1-m3. Clearly show work.
Thermodynamics A Piston-Cylinder system initially contains R-134a refrigerant at a temperature of 2.8 bar and 40 C, and its initial volume is 0.1 m3. First, heat is transferred to the system by keeping the piston constant and this process is continued until the pressure is 3.2 bar. the process is maintained by allowing the volume to change. At the end of this process, the temperature reaches 50C. Assuming the state changes as if balanced, calculate the following: a)He amount of heat transferred during constant pressure operation b)Show the state changes on the P-v diagram.
In a Piston-Cylinder system, it initially contains 2.8 bar and 40 C temperature R-134a refrigerant and the initial volume is 0.1 m3. First, heat is transferred to the system by holding the piston constant and this process is continued until the pressure is 3.2 bar. The process is then continued by allowing the volume to change while the pressure is kept constant. At the end of this process, the temperature reaches 50 C. Assuming stable changes in state, calculate the following. a) R-134a refrigerant mass in the system, b) The amount of heat transferred during the constant volume process, c) Calculate the amount of heat transferred during constant pressure operation. d) Show the processes in the P-v diagram.
Thermodynamics A Piston-Cylinder system initially contains R-134a refrigerant at a temperature of 2.8 bar and 40C° and its initial volume is 0.1 m3. First, heat is transferred to the system by keeping the piston constant and this process is continued until the pressure is 3.2 bar. the process is maintained by allowing the volume to change. At the end of this process, the temperature reaches 50C° . Assuming the state changes as if balanced, calculate the following: a) Calculate the mass of R-134a refrigerant in the system b) the amount of heat transferred during constant volume operation
A closed system of constant volume experiences a temperature rise of 20°C when a certain process occurs. The heat transferred in the process is 18 kJ. The specific heat at constant volume for the pure substance comprising the system is 1.2 kJ/kg°C, and the system contains 2 kg of this substance. Determine the change in internal energy and the work done.The specific heat at constant pressure of one kg fluid undergoing a non-flow constant pressure process is given in kJ/kg ° C by where T is in °C. The pressure during the process is maintained at 2 bar and volume changes from 1 m3to 1.8 m3and temperature changes from 50°C to 450°C. Determine:(i) Heat added (ii) Work done (iii) Change in internal energy(ii) (iv) Change in enthalpy
Water, initially a saturated liquid at 100°C, is contained in a piston-cylinderassembly. The water undergoes a process where it changes to the corresponding saturatedvapor state, during which the piston moves freely in the cylinder. If the change of state isbrought about by heating the water as it undergoes an internally reversible process atconstant pressure and temperature, determine the (a) work and (b) heat transfer per unitmass, each in kJ/kg.
Analyse an industrial thermodynamic system (refrigeration systems) in terms of work done, from first principals. Include a p-v diagram to aid in your explanation.
A gas cylinder with interior volume 11.6 L holds compressed air at 17.4 MPa. The cylinder is joined by a hose of negligible volume to a second cylinder that’s been pumped down to vacuum. When the valve on the full cylinder is opened, the air expands to fill the entire system, all the while maintaining a constant temperature. If the energy that becomes unavailable to do work is 171.8 kJ, what’s the volume of the second cylinder (L)?
Thermodynamics
Consider an air conditioning system which requires periodic air renewal. Therefore, fresh air must be introduced by mixing outside air (state 1) and return air from the conditioned room (state 2). The figure shows the principle of operation and data on the air quantities and the evaporator outlet (state 4). Determine the capacity (Q) of the evaporator coil in kJ/kg of dry air.

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