A 50-L electrical radiator containing heating oil is placed in a 50-m³ room. Both the room and the oil in theradiator are initially at 5°C. The radiator with a rating of 3 kW is now turned on. At the same time, heatis lost from the room at an average rate of 0.3 kJ/s. After some time, the average temperature is measuredto be 20°C for the air in the room, and 60°C for the oil in the radiator. Taking the density and the specificheat 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.

Heater is kept on approximately 41 minutes Thankyou! Feel free to ask if you have any…

Answered: A 50-L electrical radiator containing…

Sustainable Energy

2nd Edition

ISBN:9781337551663

Author:DUNLAP, Richard A.

Publisher:DUNLAP, Richard A.

Chapter17: Energy Conservation

Section: Chapter Questions

Problem 11P

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Similar questions

A refrigerator is to remove heat from the cooled space at a rate of 300.74 kJ/min to maintain its temperature at -8 C. If the air surrounding the refrigerator is at 28.91 C, determine the minimum power input (kW) required for this refrigerator.
Residential annual energy use. For a house with: Air exchange rate of 0.5 h−1 Cp = 1000 J/kg.K Density of air = 1.2 kg/m3 Roof area = 144 m2; opaque wall area = 96 m2; window area = 24 m2; volume = 360 m3 Conductivity of Uwall = 0.60 W/(m2-K); Uwin = 3.0 W/(m2-K); Uroof = 0.40 W/(m2-K) Heating system efficiency of 0.85 Heating degree days (HDD) of 3500 K-days Calculate the Ktot for this house. Calculate the annual energy used to heat this house (in GJ).
A wooden shelter has walls constructed of wooden planks 1.00 cm thick. If the exterior temperature is -20.0°C and the interior is 5.00°C, find the rate of energy loss through a wall that has dimensions 1.95 m by 2.30 m.
An electric heater supplies (R+2.5)kW of power in the from of heat to water. If in 5.5 hours, 350kg of water is heated from - 10°C to 60°C, find the work done (W) of heater. Also calculate the amount of heat energy (Q) transferred to the water. Consider the specific heat of water is 4184J/kg k. R= 83
On a hot summer day, the flat roof of a tall building reaches 50° C in temperature. The area of the roof is 400m2. Estimate the heat radiated from this roof to the sky in the evening when the temperature of the surrounding air or sky is at 20° C. The temperature of the roof decreases as it cools down. Estimate the rate of energy radiated from the roof, assuming roof temperatures of 50, 40, 30, and 25° C. Assume ε = 0 9 . for the roof.
The ionization constant for water (Kw) is 9.311 × 10−14 at 60 °C. Calculate [H3O+], [OH−], pH, and pOH for pure water at 60 °C.
Solve the heat equation ut=cuxx on the domaion 0≤x≤2, t>0 subject to u(x,0)=x(x−2), u(0,t)=0,u(2,t)=0
ENERGY CONSERVATION - BERNOULLI EQUATION. 3. Kerosene flows at 25 ° C, at a rate of 1200 L / min, from the lower tank (A) to the upper tank (B) through a 2 ”copper tube. type K. Calculate the air pressure over the fluid.
Compare the masses and volumes of water, concrete, sand, and wood needed to store 106 Btu of heat if the operating temperatures are Tc = 85F and Th = 180F. In each case, calculate the edge length of a square storage unit with a height of 8 ft.
A line was measured using a 50m tape and was recorded as 746.22m. when the average temperature during measurement was 16°C. If the tape is of standard length at 20°C and a coefficient of thermal expansion of 0.0000116m/°C. Compute the correct length of the measured line.
The air in a certain room 150’ x 50’ x 12’ tested 0.2% CO2. Fresh air containing 0.05% CO2 was then admitted by ventilators at the rate of 9000 ft3/min. Find the % of CO2 after 20 min.

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