c) A piston cylinder assembly initially contains water at 75 kPa and 8 percent quality (x = 0.08) with a volume of 2 m'. The water is then heated until its pressure is 400 kPa. During this process, the pressure and volume are related by P = av +b, where a = 50 kPa/m' and b = -25 kPa. Both 'a' and 'b' are constants. i) Determine the specific volume (m/kg), specific internal energy (k)/kg) and mass (kg) of water at the initial state. ii) Determine the specific volume (m/kg) and specific internal energy (kJ/kg) of water at the

c) A piston cylinder assembly initially contains water at 75 kPa and 8 percent quality (x = 0.08) with a volume of 2 m'. The water is then heated until its pressure is 400 kPa. During this process, the pressure and volume are related by P = av +b, where a = 50 kPa/m' and b = -25 kPa. Both 'a' and 'b' are constants. i) Determine the specific volume (m/kg), specific internal energy (k)/kg) and mass (kg) of water at the initial state. ii) Determine the specific volume (m/kg) and specific internal energy (kJ/kg) of water at the

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter2: Matter And Energy

Section: Chapter Questions

Problem 29RQ: If 3000 ft3 of air is crossing an evaporator coil and iscooled from 75F to 55F, what would be the...

See similar textbooks

Similar questions

3. A 2-kg steam water mixture at 1.0 MPaa is contained in an inflexible tank. Heat is added until the pressure rises to 3.5 MPaa and the temperature to 400 °C. Determine: a) Heat transferred (kJ), b) AH (kJ), c)AS (kJ/k)
Saturated liquid water contains in a rigid tank at pressure 150 kPa. Mass of liquid water in the tank is 30 kg. Find the temperature in the tank and the volume of the tank. a) T =111.35°C and V = 0.03159 m³ b) T = 211.35°C and V = 0.03159 m³ c) T =111.35°C and V = 0.3159 m³ d) T = 211.35°C and V = 0.3159 m³
You are analyzing a piston-cylinder assembly that contains air at an initial pressure and temperature of 500 kPa and 600°C respectively. The air undergoes a polytropic process with the polytropic gas exponent n = 1.2 until the pressure reaches 100 kPa. Assuming the air behaves as an ideal gas (Rair = 0.287 kJ/kg-K). a) Determine the initial specific volume. b) Determine the final specific volume. c) Determine the work per unit mass of air. d) Draw a p-v diagram to qualitatively show the process
Question #1 a) The absolute pressure inside a tank is 0.13bar, and the surrounding atmospheric pressure is 98 kPa. A Bourdon gage is mounted in the tank wall to measure the pressure, in kPa? Is this a vacuum or gage reading? b) (967)kJ of heat is transferred from the system to the surroundings when a closed system of mass (28)kg undergoes a process. During the process, 200kJ work is done on the system. If the initial specific internal energy of the system is 300 kJ/kg, Describe the process and determine the final specific internal energy, in kJ/kg? Neglect changes in kinetic and potential energy.
A 100 liter tank contains a mixture of saturated liquid water and saturated steam at 370 °C. a) Find the mass of each phase if their volumes are equal b) Find the volume occupied by each phase if their masses are equal. Given: v+ = 2.213x10-3 m=/kg; Vg = 4.925x10-3 m%/kg
The volume of the passenger compartment of an aircraft is 2100 m'. A piece of automatic equipment maintains the air inside the plane at a pressure of 98 kPa and a temperature of 23°C. a) Calculate the mass of the air inside the plane. b) Determine the percent increase in the mass of the air if the pressure is increased to 101 kPa and the temperature drops to 20°C.
If a piston-cylinder system has V = 0.8m^3 of saturated water vapor at P1 = 250 kPa, at which the piston is sitting on a number of stops. The heat is slowly transferred to steam until the piston begins to move off of the stops at a pressure of P2 = 300 kPa, the heat transfer to steam continues until the volume doubles. a) draw the control volume, with assumed direction of work and heat transfers b) draw P-v diagram c) find final temperature
2) a) A container filled with water (p= 1000 kg/m³) sits on a scale. The scale shows a reading of 15.0 N. Afterward, a weight with a mass of 0.2 kg and a volume of 2.35 × 10-5 m³ is submerged in the water without any water spilling out. Neither the weight nor the string it hangs from is in contact with the container or the scale. Refer to the figure on the next page. b) What does the scale show when the weight is freely suspended in the water? c) What does the scale show when the weight is lowered to the bottom of the container? Fo THE
Inside a piston-cylinder device there is 5 kg of a moist water vapor at 125 kPa. At the beginning there are 2 kg of water in the liquid phase, and the rest is in the vapor phase. Then, heat is transferred to the water; the plunger, which rests on a set of stops, begins to rise when the pressure inside reaches 300 kPa. Heat transfer continues until the total volume increases by 20 percent. a) the start and final temperatures b) the mass of liquid water when the plunger starts to rise c) the work done during this process. Also plot the process on a P-v diagram
Question 1 The volume of the passenger compartment of an aircraft is 2100 m³. A piece of automatic equipment maintains the air inside the plane at a pressure of 98 kPa and a temperature of 23°C. a) Calculate the mass of the air inside the plane. b) Determine the percent increase in the mass of the air if the pressure is increased to 101 kPa and the temperature drops to 20°C.
Liquid is held into two components Separated by a membrane.the total volume is 775ft3 and the volume of compartment Y is 300ft3 and it’s specific volume is 9.55ft3/lb.the membrane breaks and the resulting specific volume is 12.5 ft3/lb. a) determine the original specific volume in compartment X b)after breaking the membrane,the temperature of the liquid is 3 degree centigrade.if the absolute temperature of this reading is doubled and decreased by 239 degrees,what would be the final temperature of the maximum degree Celsius and degree Rankine
Question 1 a) Initially, the wheel was filled with Nitrogen at temperature of 20°C and a pressure gage of 200 kPa. The volume of the wheel was considered to remain unchanged and equals to 18 L. i) Obtain the gage pressure in the wheel when the Nitrogen temperature in the wheel rises to 45°C. ii) Obtain the mass of Nitrogen that must be removed in order to restore pressure to its original value at this new temperature. b) Calculate the gage pressure at points A, B, C and D. Take air density as 1.21 kg/m.