An insulated tank contains 10 litres of water at 100 kPa and 20°C A 2 kW electric resistance heater is immersed in water Considering all the electrical energy is used to raise the temperature of water, find the time required to raise the water temperature to 70°C Water can be considered as a constant density flund with density 1000 kg/m³ and the specific heat is constant as 4.2 kJ/kg C in the given range of temperature

An insulated tank contains 10 litres of water at 100 kPa and 20°C A 2 kW electric resistance heater is immersed in water Considering all the electrical energy is used to raise the temperature of water, find the time required to raise the water temperature to 70°C Water can be considered as a constant density flund with density 1000 kg/m³ and the specific heat is constant as 4.2 kJ/kg C in the given range of temperature

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter8: Natural Convection

Section: Chapter Questions

Problem 8.12P: 8.12 An electric room heater has been designed in the shape of a vertical cylinder 2 m tall and 30...

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Concept explainers

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.

Question

An insulated tank contains 10 litres of water at 100 kPa

and 20°C A 2 kW electric resistance heater is immersed in water Considering all the electrical energy is used to raise the temperature of water, find the time required to raise the water temperature to 70°C Water can be considered as a constant density flund with density 1000 kg/m³ and the specific heat is constant as

4.2 kJ/kg C in the given range of temperature

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