HEAT+MASS TRANSFER:FUND.+APPL.
6th Edition
ISBN: 9780073398198
Author: CENGEL
Publisher: RENT MCG
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Chapter 1, Problem 121P
A
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A piston-cylinder device as shown in Figure 1-7, initially contains 0.75 kg of refrigerant-
134a at 120 kPa and 20°C. Heat is now transferred to the refrigerant from a source at
150°C, and the piston, which is resting on a set of stops, starts moving when the pressure
inside reaches 140 kPa. Heat transfer continues until the temperature reaches 90°C.
Assuming the surroundings to be at 25°C and 100 kPa, determine:
(a) the work done,
(b) the heat transfer,
(c) the exergy destroyed,
(d) the second law efficiency of this process.
Environment
100 kPa
25°C
R-134a
R-134a
0.75 kg
0.75 kg
Нeat
120 kPa
140 kPa
20°C
90°C
Initial State
Heat Source
Final State
150°C
Figure 1-7 A piston-cylinder device
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.K
A soup is set to boil. When the soup reaches 170°F, remove it from the heat and set it on the kitchen counter. The air in the kitchen is 80°F, and the soup in the bowl is 120°F after two minutes. After removing the soup from the heat, how long will it be 90°F?
Chapter 1 Solutions
HEAT+MASS TRANSFER:FUND.+APPL.
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Ch. 1 - Prob. 11CPCh. 1 - An ideal gas is heated from 50C to 80C (a) at...Ch. 1 - What is heat flux? How is it related to the heat...Ch. 1 - What are the mechanisms of energy transfer to a...Ch. 1 - A logic chip used in a computer dissipates 3 W of...Ch. 1 - Consider a 150-W incandescent lamp. 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What...Ch. 1 - Consider a house in Atlanta, Georgia, that is...Ch. 1 - Prob. 120PCh. 1 - A 4m5m6m and room is to be heated by one ton (1000...Ch. 1 - Engine valves (cp=440J/kg.Kandp=7840kg/m3) are to...Ch. 1 - Prob. 123PCh. 1 - Prob. 124PCh. 1 - A 0.3 -cm-thick, 12-cm-high, and 18-cm-long...Ch. 1 - A 40-cm-long, 800-W electric resistance heating...Ch. 1 - It is well known that wind makes the cold air feel...Ch. 1 - An engine block with a surface area measured to be...Ch. 1 - Prob. 129PCh. 1 - Prob. 130PCh. 1 - Prob. 131PCh. 1 - Consider a person standing in a room maintained at...Ch. 1 - Prob. 133PCh. 1 - Prob. 134PCh. 1 - Prob. 135PCh. 1 - Prob. 136PCh. 1 - Prob. 137PCh. 1 - Prob. 138PCh. 1 - Prob. 139PCh. 1 - Prob. 140PCh. 1 - Prob. 141PCh. 1 - Prob. 142PCh. 1 - A 2-kW electric resistance heater submerged in...Ch. 1 - Prob. 144PCh. 1 - A cold bottled drink (m=2.5kg,cp=4200J/kg.K) at...Ch. 1 - Prob. 146PCh. 1 - Air enters a 12-m-long, 7-cm-diameter pipe at 50oC...Ch. 1 - Prob. 148PCh. 1 - Steady heat conduction occurs through a...Ch. 1 - Heat is lost through a brick wall (k=0.72W/m.K),...Ch. 1 - Prob. 151PCh. 1 - A 40-cm-long, 0.4-cm-diameter electric resistance...Ch. 1 - Prob. 153PCh. 1 - Prob. 154PCh. 1 - Over 90 percent of the energy dissipated by an...Ch. 1 - On a still, cleat night, the sky appears to be a...Ch. 1 - Prob. 157PCh. 1 - Prob. 158PCh. 1 - A persons head can be approximated as a...Ch. 1 - A person standing in a room loses heat to the air...Ch. 1 - Write an essay on how microwave ovens work, and...Ch. 1 - Using information form the utility bill for the...Ch. 1 - It is well know that at the same outdoor air...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.Similar questions
- Initially, 200 L of saturated vapor refrigerant-134a in a piston. The piston is free to move, and its mass is such that it maintains a pressure of 900 kPa on the refrigerant. The refrigerant is now heated until its temperature rises to 60°C. The work done during this process is Select one: 73.55 kJ 37.55 kJ 27.49 kJ O 72.49 kJarrow_forwardRefrigerant-134a (R-134a) enters the expansion valve of a refrigeration system at 650 kPa with a quality of 20%. The pressure of R-134a at the outlet is 200 kPa. a)Determine the temperature of R-134a at the outlet in oC. Calculate the difference of internal energy between the outlet and inlet in kJ/kgarrow_forwardQ1/ A frictionless piston–cylinder device initially contains 200 L of saturated liquid refrigerant-134a. The piston is free to move, and its mass is such that it maintains a pressure of 900 kPa on the refrigerant. The refrigerant is now heated until its temperature rises to 70°C. Calculate the work done during this process. Answer: 5571 kJarrow_forward
- A certain quantity of air in a closed vessel with a fixed volume of 0.15 m3 exerts 1 MPa pressure at 500 K. If the vessel is cooled while the pressure is reduced to 350 kPa, determine the heat transfer during the process.arrow_forwardNOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. A piston-cylinder device initially contains 1 kg saturated liquid water at 200°C. Now heat is transferred to the water until the volume quadruples and the cylinder contains saturated vapor only. The saturated liquid properties of water at 200°C 3 are vf= 0.001157 m³/kg and uf= 850.46 kJ/kg (Table A-4). Water 71 kg 200°C Q Determine the internal energy change of the water. The change in internal energy is kJ.arrow_forwardA sealed rigid vessel has volume of 1 m3 and contains 2 kg of water at 100°C. The vessel is now heated. If a safety pressure valve is installed, at what pressure, in bar, should the valve be set to have a maximum temperature of 200°C?arrow_forward
- A piston-cylinder device contains 0.1 m3 of refrigerant 134a at 0.24 MPa and 40ºC. Initially the piston is fixed with a pin. Heat is transferred now to the refrigerant from a source at 100ºC until the pressure rises to 0.28 MPa. Then, heat is given to an environment with a temperature of 25ºC at a constant pressure (the pin is pulled and in this case, the mass of the piston and the masses on it and the pressure created by the atmospheric pressure are equal to the pressure inside the cylinder) the temperature is brought to a temperature of 50ºC. a) Determine the heat and work interaction for each process b) Sketch the P-v and T-s diagrams of the processes with respect to the saturation lines c) Determine the entropy change of the refrigerant 134a during these two processes d) Determine the entropy generation during these processes. Are these processes appropriate to 2. law of thermodynamics, explainarrow_forwardThermodynamics: 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.arrow_forwardMention table no or attach the tablearrow_forward
- A piston-cylinder device whose piston is resting on top of a set of stops initially contains 0.6 kg of helium gas at 100 kPa and 25°C. The mass of the piston is such that 500 kPa of pressure is required to raise it. How much heat must be transferred to helium before the piston starts rising? The specific heat of helium at room temperature is cy= 3.1156 kJ/kg-K (Table A-2). The amount of heat to be transferred to helium is kJ.arrow_forwardA 5-kg saturated liquid water contained in a piston-cylinder arrangement at 200 kPa is heated by passing a current of 8 A through an electric resistance heater kept within the cylinder for 46 min. Water is stirred by a paddle wheel which does a work of 500 kJ. If one-half of the liquid is evaporated at constant pressure, what is the voltage of the electric source?arrow_forwardA piston cylinder assembly initially contains 25g of saturated water vapor at 600kpa pressure. Then, an electric heater in the cylinder is switched on and a current of 0.2A from the 0.12kv source flows through the heater for 18 minutes. Calculate the final temperature of the system if 4.17 Wh heat is transferred from the fixed cylinder to the environment during this period.arrow_forward
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