Answered: A closed tank containing hot air has an…

A closed tank containing hot air has an initial internal energy of 400 kJ. During the next 5 min, the tank loses heat to the surroundings at a rate of 1.5 kW,

Sustainable Energy

2nd Edition

ISBN:9781337551663

Author:DUNLAP, Richard A.

Publisher:DUNLAP, Richard A.

Chapter8: Direct Use Of Solar Energy

Section: Chapter Questions

Problem 15P

See similar textbooks

Related questions

Q: A 1 lbm/s fluid enters a machine at 170 m/s. 800 kPa, and with a specific volume of 0.3 m³/kg. The…

A: Determine workdone by the fluid?

Q: Kerosene flows at 25 ° C, at a rate of 1200 L / min, from the lower tank (A) to the upper tank (B)…

A: Given data Q=1200 L/min=0.02m3/sA=π4d2=π4×0.0482 =1.809×10-3m2Velocity at pipe exit,…

Q: A refrigerator is to remove heat from the cooled space at a rate of 300.74 kJ/min to maintain its…

A: A type of elastic collision in which two objects of equal mass initially move in the same direction…

Q: Oil of specific gravity of 0.72 flows through a 7.5 cm diameter orifice with Cv = 0.95, Cc = 0.65.…

A: Given data;-specific gravity of an oil(G)0.72Diameter of an orifice (D)=7.5 cmCo-efficient of…

Q: A liquid of specific gravity SG = 1.62 flows in a 75 mm diameter horizontal pipe. The total energy…

A: Specific gravity of liquid, SG =1.62Diamteter of pipe, D=75mm =0.075mThe total energy at a point, E…

Q: Q1; If a system has 30J of heat added to it, and the total change in its internal energy is 10J, how…

A: Given, Heat ,Q = 30 J Change, In internal energy, ∆U…

Q: 1. A thin wall double tube heat exchanger should be used to cool oil (Cp = 2200 J / Kg * K) from 149…

A: LMTD and NTU are used to analyse heat exchangers. LMTD is Log mean temperature difference and NTU…

Q: 9. Find the specific energy of flowing water through a rectangular channel of width 5 m when the…

Q: Q2: Air stream at 27°C moving at 0.3 m/s across 100 W incandescent bulb, glowing at 127 °C. If the…

Q: A well-insulated and perfectly sealed room is installed with 4-hp fan to circulate air for 1.5…

Q: The air in a certain room 150’ x 50’ x 12’ tested 0.2% CO2. Fresh air containing 0.05% CO2 was then…

Q: in of a light oil are to be heated from 20C to 100C (with zero vaporization) in an exchanger using…

A: Given:- heated temperature=20 degree Celsius to 100 degree Celsius quantity of light oil =2m3/min…

Q: Find the specific energy of flowing water through a rectangular channel of width 5 m when the…

A: The answer is found to be Specific energy =3.0226 m For explanation please refer the attached…

Q: A heat pump supplies heat energy to a house at the rate of 140,000 kJ/h when the house is maintained…

A: It is required to determine the maximum Coefficient Of Performance for air. We know that, 0oC = 273…

Q: The compressed air requirements of a textile factory are met by a large compressor that draws in 0.6…

A: Q = 0.6m3/s g= 9.81m/s2 l (length) = 83m mu = 2*10-5 kg/m-s D (diameter) =30cm = 0.3m & r =…

Q: Steam enters a long, horizontal pipe with an inlet diameter of D1=12 cm with a velocity of 2 m/s.…

A: mass flow rate is (density *Q) that is (density*AV) so Q=(3.14*.12*.12*2/4)*_(1/0.25799) =.0877kg/s

Q: A classroom that normally contains 40 people is to be air-conditioned with window air-conditioning…

A: Given: The total number of people in the classroom is 40. The cooling capacity of window…

Q: certain fluid has an enthalpy 1800 KJ/kg and 500 KJ/kg work flow. Find the internal energy.

Q: A point in a water pipe line, velocity is 3.5m/s, the pressure reading is 20 kPa and the elevation…

A: P1=20kPa V1=3.5m/s

Q: Q2: A compounded impulse turbine has two rows of moving blades separated by a fixed row of blades.…

Q: In a test to determine the three orifice coefficients under constant head of water of 1.8 m, it was…

Q: 1-34 A 4-kW resistance heater in a water heater runs for 2 hours to raise the water temperature to…

A: E = 4 KW x 2 hrs E = 8 kWh

Q: The inlet and exit temperatures of the air expanded at an adiabatic turbine are 50 Cand -30 C,…

Q: Determine the work done by an electric motor lifting an elevator weighing 4 kN through five floors;…

A: Given: Weight of lift, W = 4 kN = 4000 N Number of floors, n = 5 Distance between each floor, d = 3…

Q: Water is flowing through a pipe of 5 cm diameter under a pressure of 29.43 N/cm (gauge) and with…

Q: A pump is attached to a fire hydrant to produce a jet that rises to a minimum height of 13.5 m at a…

A: The fundamental point of hydraulics is to comprehend, and control to serve society, the event,…

Q: On a hot summer day, the flat roof of a tall building reaches 50° C in temperature. The area of the…

A: The rate of heat energy radiation (R) Joule/sec/m2 or watt/m2 Depends upon certain parameters, they…

Q: What is the energy loss through a length of pipe from which all the discharge is taken out uniformly…

Q: A 75 gal. electric hot water heater provides 9000 Watts of power to heat water. If the heater is…

A: Solution: Given Data: Power=9000 watts Initial temp= 50° F The amount of heat required to heat…

Q: 100°? air flows through a round aluminum tube of ID 60mm and OD 80mm at 4 ?? .The tube is covered in…

A: Take 25 °C as room temperature r1=30 mmr2 = 40 mmr3 = 45 mm Assume unit length of the tube Thermal…

Q: 1 kg of steam undergoes a reversible isothermal process from 20 bar and 250 °C to pressure of 30…

A: Given Mass=1kg P1=20bar T1=250℃ P2=30bar

Q: Calculate the values of critical height and critical velocity for water flowing through a…

A: Given: Width of channel, b = 5 m Flow rate, Q = 15 m3/sec

Q: It takes 60 kW to keep the interior of a certain house at 60°C when the outside temperature is 10°C.…

Q: 1. During which case will the power loss be maximum? a) High viscosity oil b) Low viscosity oil c)…

A: correct ans:-(a) high viscosity oil

Q: An incandescent lamp filament has area 40 mm' and operates at a temperature of 1127°C. Assume that…

Q: 38 degrees celsius and 218 kpa gage, the specific weight of a certain gas was 15.0 n/m^3. determine…

A: Answer: Given: Temperature, T = 38 deg. C. = 38+273 = 311K Pressure, P = 218 kPa Specific Weight of…

Q: A long rectangular bar (cross section size: 0.36 m x0.13 m, k = 57 W/m K, a= 4.40x10 m/s) is…

Q: Residential annual energy use. For a house with: Air exchange rate of 0.5 h−1 Cp = 1000 J/kg.K…

A: Given data- Air exchange rate of 0.5 h−1 Cp = 1000 J/kg.K Density of air = 1.2 kg/m3 Roof area = 144…

Q: Suppose the pump of Fig. is situated between two water tanks with their free surfaces open to the…

A: The graph shown below indicates the net head as a function of the volume flow rate.

Concept explainers

Temperature as a Fundamental Dimension

There are certain rules to write dimensions of a physical quantity using the fundamental dimensions. They are outlined below.

Question

A closed tank containing hot air has an initial internal energy of 400 kJ. During the next 5 min, the tank loses heat to the surroundings at a rate of 1.5 kW, while an electrical element supplies 1000 W to the air. Find the final internal energy of the air.

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

SEE SOLUTION Check out a sample Q&A here

Step 1

VIEW

Step 2

VIEW

Step by step

Solved in 2 steps

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, civil-engineering and related others by exploring similar questions and additional content below.

Similar questions

Problem 2 Refrigerant-134a enters the compressor of a refrigeration system as saturated vapor at 0.16 MPa, and leaves as superheated vapor at 0.9 MPa and 70°C at a rate of 0.08 kg/s. Determine the rates of energy transfers by mass into and out of the compressor. Assume the kinetic and potential energies are negligible.
Steam enters a turbine at 30 bar, 300°C (u = 2750 kJ/kg, h = 2993 kJ/kg) and exits the condenser as saturated liquid at 15 kPa (u = 225 kJ/kg. h = 226 kJ/kg). Heat loss to the surrounding is 50kJ/kg of steam flowing through the turbine. Neglecting changes in kinetic energy and potential energy, the work output of the turbine (in kJ/kg of steam) is
An incandescent lamp filament has area 40 mm and operates at a temperature of 1127°C. Assume that all the energy furnished to the bulb is radiated from it. If the filament's emissivity is 0.83, how much power must be furnished to the bulb when it is operating? (b)
2-64 Nitrogen enters a steady-flow heat exchanger at 150 kPa, 10°C, and 100 m/s, and it receives heat in the amount of 120 kJ/kg as it flows through it. Nitrogen leaves the heat exchanger at 100 kPa with a velocity of 200 m/s. Determine the Mach number of the nitrogen at the inlet and the exit of the heat exchanger.
Steam enters a turbine at 15bar and 600°C with a rate of 0.371 kg/s. The steam expands to 0.08 bar with quality at 90%. Stray heat transfer and kinetic and potential energy effects are negligible. For operation at steady state, • the volume flowrate at the turbine outlet is m³/s, ⚫the power developed by the turbine is ⚫and the temperature at the turbine exit is kW, °C.
One single phase energy meter operating on 230 V and 5 A for 5 hours makes 1940 revolutions. Meter constant in revolution is 400. The power factor of the load will be:
A 150-mm-diameter jet of water is discharging from a nozzle into the air at a velocity of 45 m/s. Find the power in the jet with respect to a datum at the jet.
1) A cylinder of volume 50cm made of Pyrex glass is full to the brim with acetone. Suppose the cylinder and acetone are warmed by 30°C. (Coefficient of linear expansion of glass, 3.2 x 10-6K-1 and acetone, 5.0 x 10-5K-1) i. Calculate the change in volume of the glass. ii. Calculate the change in volume of the acetone. ii. Will any acetone spill out of the cylinder? Explain.
An oil of viscosity 5 poise is used for lubrication between a shaft and sleeve. The diameter of the shaft is 0.5 m and it rotates at 200 r.p.m. Calculate the power lost in oil for a sleeve length of 100 mm. The thickness of oil is 1 mm.
A reversible power cycle operating as in the figure receives energy QH by heat transfer from a hot reservoir at TH and rejects energy Qc-16 Btu by heat transfer to a cold reservoir at Te -40°F. The work for the cycle Wcycle - 30 Btu. Determine the thermal efficiency and TH, in °F. Hot reservoir Cold reservoir M OH Wis
B. A Carnot engine operates between two temperature reservoirs maintained at 200°C and 20 °C, respectively. If the desired output of the engine is 15 kW, as shown in Fig. below, determine the heat transfer from the high-temperature reservoir and the heat transfer to the low-temperature reservoir. TH-200°C On Engine QL T₁ - 20°C W 15 kW
A 50-L electrical radiator containing heating oil is placed in a 50-m³ room. Both the room and the oil in the radiator are initially at 5°C. The radiator with a rating of 3 kW is now turned on. At the same time, heat is lost from the room at an average rate of 0.3 kJ/s. After some time, the average temperature is measured to be 20°C for the air in the room, and 60°C for the oil in the radiator. Taking the density and the specific heat of the oil to be 950kg/m³ and 2.2kJ/(kg °C), respectively, determine how long the heater is kept on. Assume the room is well-sealed so that there are no air leaks.