An empty greenhouse with a volume of 60m³ has cracks around doors and windows so that air can flow through and allowing the pressure inside to always remain equal to that of the surrounding environment. On a particular day when the atmospheric pressure is 100kPa, the air in the greenhouse changes temperature from 10℃ to 40℃ by means of radiative heating from the sun. Assume that the air can be modeled as an ideal gas with constant properties cᵥ=715.9J/kg*K and R?=286J/kg*K.  (1) What is the change in energy stored by the system?  (2) Treating the greenhouse as an open system, determine the heat transfer necessary to produce this temperature change.  (3) Is the process totally reversible? Justify your answer. If it is not totally reversible, identify the source(s) of irreversibility.

Q: elium gas initially has a volume of 50 liters, a pressure of 2 x 10⁵ N/m², and a temperature of 300…

A: Given:V1=50 L =50*10-3 m3P1=2*105 N/m2T1=300 KV2=100 L =100*10-3 m3

Q: Three cubic meter of air at a pressure of 20 kPag and 20 0 C is compressed at constant volume to a…

A:

Q: t=280 degrees celsius and s=5.72 KJ/KG determine enthalpy and specific internal energy

A: To determine enthalpy and specific internal energy at T=280 degrees celsius and s=5.72 KJ/KG

Q: Air is compressed into a 90 ft3 rigid tank until the pressure is 30.5 psia and the temperature…

A:

Q: A rigid vessel of volume 0.02 m3 contains 0.054 kg of steam at an initial pressure of 4 bar. Heat is…

A:

Q: 2. Steam at a temperature of 300°C has a specific volume of 0.09765 m³/kg. Determine the pressure,…

A: Given       Temperature, T = 300oC  Specific volume, v = 0.09765 m3/kg Find  Pressure, P Specific…

Q: A monatomic ideal gas initially fills a V0 = 0.35 m3 container at P0 = 75 kPa. The gas undergoes an…

A:

Q: The fluid is heated from 125 degrees Fahrenheit to 225 degrees Fahrenheit. Consider an ideal gas…

A: Given data A fluid is heated from 125°F to 225°F, R = 85 ft-lbf/lbm-R CP = 0.35 + 0.000325T…

Q: In a central air-conditioning system, 72 kg per hour of air at 15 degree celsius and 1.1 bar enters…

A: Given data: mass flow rate of air = 72 kg/hr = 0.02 kg/s Temperature of air = 15oC =15+273=288 K…

Q: Problem No 1: A 1.5 kg of gas expands in a closed system from 6.5 kPaa and 60 liters to 100 liters.…

A: Given : Initial pressure P1 = 6.5 kPa V1 = 60 litres = 60/1000 =0.06 m3 V2 = 100 litres = 100/1000 =…

Q: 5. Determine the density of the balloon just before it bursts.

A:

Q: A rigid tank with a volume of 4 m contains superheated steam at 500 kPa and 500 °C. Part A Determine…

A:

Q: Nitrogen (N2) at 100C and 600 kPa expands in such a way that it can be approximated by a…

A: Given data: Initial temperature, T1=100°C=373 KInitial Pressure, P1=600 kPaPolytropic constant,…

Q: An insulated evacuated tank of 1.75-m> volume is attached to a line containing steam at 400 Wa and…

A: Given Data  The volume of the tank, V=1.75 m3 Steam pressure, P=400KPa Steam temperature, T=513.15K…

Q: Determine the quality of 170 kPa of steam when 470 kJ / kg of energy is lost from the saturated…

A:

Q: A rigid vessel contains 5kg of wet steam (water) at 0.4 MPa. After the addition of 9585 kJ of heat…

A: Given Data  Mass, m=5Kg P1=0.4MPa=400 KPa P2=2MPa  T2=700°C Heat Addition, Qadd=9585 KJ By using…

Q: Consider 0.5 kg of Refrigerant -134a contained in a piston-cylinder assembly with initial…

A: Given data:initial temperature =80°cpressure=7baradiabatic expansion=48°cpressure=2barso, from the…

Q: The decrease in internal energy of a 1.25-kg ideal gas is 345 kJ when the pressure decreases from…

A: State 1: P1 = 690 kPa, V1 = 0.05 m3 State2: P2 = 138 kPa, V2 = 0.14 m3    mass, m = 1.25 kg decrease…

Q: A rigid tank initially contains 1.5 kgm of air at 80 deg F and 50 psia. 25 KJ of heat is transferred…

A:

Q: Calculate the diameter of a spherical balloon required to lift a payload of 20,000 kg. The gas to be…

A: GIVEN DATA- helium at 101.325 kPa and 21.1°C surrounding air is 101.325 kPa and 21.1°C. Load Lift =…

Q: A. Two kg of steam with a quality of 22 percent is heated at a constant pressure of 300 kPa until…

A:

Q: In a cylinder at 400 degrees Celsius and 2 kilograms of superheated water vapor in 600 kilopascals…

A:

Q: A rigid vessel of volume 0.86 m° contains 1 kg of steam at a pressure of 2 bar. Evaluate the…

A: Answer: (a) Specific volume is 0.86 m3/kg. (b) Temperature is 120.21 ℃. (c) Dryness fraction is…

Q: al gas expands adiabatically from a volume of 2.5 x 10- m³ to 3.0 x 10- m. If the initial p

A: given:V1=2.5×10-3m3V2=3×10-3m3p1=5×105paT1=295K

Q: Thermodynamic problem. Determine the work necessary to compress a gas from an initial volume VI=90L…

A:

Q: Show solution: A rigid tank contains 20 lbm of air at 20 psia and 70°F. More air is added to the…

A:

Q: Ten ft^3 of air at 300 psia and 400°F is cooled to 140°F at constant volume. What are a) the final…

A: Given : To determine: a) the final pressure b) work non flow c) change in internal energy d) Heat e)…

Q: The increase of enthalpy of a certain gas is 141.9 kJ/kg when the pressure increases from 103.448…

A:

Q: 6.16 kg of steam at a pressure of 20 bar and temperature of 300 deg C expands isentropically to a…

A:

Q: A rigid vessel contains 5.0 kg of wet steam at 0.4 MPa. After the addition of 9585 kJ the steam has…

A:

Q: e gage pressure of an ideal gas changes from 100 kPa to 200 kPa while maintaining a constant…

A: Given:P1=100 KPa (gauge)P2=200 KPaV1=100 L=0.1 m3

Q: fluid is heated from 125 degrees Fahrenheit to 225 degrees Fahrenheit. Consider an ideal gas with…

A:

Q: Helium gas undergoes an adiabatic process in which the Kelvin temperature doubles. By what factor…

A: Given data: The initial temperature, T1 = To. The final temperature, T2 = 2To. For monoatomic gas,…

Q: 1 kg air is contained in an INSULATED piston-cylinder device. Initially, the temperature and…

A: The insulated system is system from which heat transfer is zero. The reversible process, and…

Q: A compressor receives CO2 with a pressure of 1 ATM and a temperature of 300 K. The compressor…

A:

Q: When an ideal gas undergoes isothermal compression as a closed system, its specific internal energy…

A: Ideal gas is a gas which obeys ideal gas equation PV=mRT. Isothermal compression process is a…

Q: Ammonia with MW=17, weighing 22kg is confirmed inside a cylinder equipped with a piston has initial…

A:

Q: Air is expanded from 300 psia and 500°F to 100 psia and 50°F. Assuming constant specific heats,…

A: Given:P1=300 psiaT1=500°P2=100 psiaT2=50°F

Q: Air inside a cylinder has increased its pressure from 100 KPa to 200 KPa. Evaluate the amount of…

A:

Q: Q3/ Steam at 500 kPa and a quality of 90 percent occupied a rigid vessel of volume 0.3m'. Calculate…

A:

Q: Question : Air undergoes isentropic compression from the initial temperature and pressure T1 = 25°C…

A:

Q: wer 2. Ammonia weighing 22 kgs is confirmed inside a cylinder equipped with a piston has an initial…

A:

Q: Q1. A piston cylinder contains an ideal gas. The gas expands isothermally. Which statement is true…

A: Given a piston cylinder contains an ideal gas Given process is isothermal Which means constant…

Work and Heat Transfer

It is generally related to thermal engineering which tells about the use, creation, conversion and transfer of heat energy between the systems. It is also considered that to transfer heat from one source to another, transfer of masses is also required. There are various mechanisms by which, transfer of heat takes place i.e. thermal conduction, convection, radiation or by change of phase. All these mechanisms have their own specific features which sometimes occur simultaneously within the same system.