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A tank contains 50 litres of water at 20°C. An electrical heating element is switched on and the temperature increased to 100°C without boiling the water. a) If the heat capacity of water is 4.2 kJ/kg K and the density of water is 1000 kg/m², calculate the energy in kJ required to carry out this heating. Assume no heat loss to the surroundings. b) The heating operation takes 26 minutes. Assuming 100% heater efficiency, calculate the power of the heater in kW. The heater is left on for a further 30 minutes. If the latent heat of vaporisation of water is 2260 kJ/kg, calculate the mass of water vaporised. Again, assume no heat loss to the surroundings. c)

A tank contains 50 litres of water at 20°C. An electrical heating element is switched on and the temperature increased to 100°C without boiling the water. a) If the heat capacity of water is 4.2 kJ/kg K and the density of water is 1000 kg/m², calculate the energy in kJ required to carry out this heating. Assume no heat loss to the surroundings. b) The heating operation takes 26 minutes. Assuming 100% heater efficiency, calculate the power of the heater in kW. The heater is left on for a further 30 minutes. If the latent heat of vaporisation of water is 2260 kJ/kg, calculate the mass of water vaporised. Again, assume no heat loss to the surroundings. c)

Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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In a part, l found that Q=16800kJ

In b part Power=10.77kW/hr.

In c part l know, Latent heat= latent heat of vaporization(2260kJ/kg) × mass. But couldn't solve this part.

 

 

 

 

A tank contains 50 litres of water at 20°C. An electrical heating element is switched on and the temperature increased to 100°C without boiling the water. 8. a) If the heat capacity of water is 4.2 kJ/kg K and the density of water is 1000 kg/m², calculate the energy in kJ required to carry out this heating. Assume no heat loss to the surroundings. b) The heating operation takes 26 minutes. Assuming 100% heater efficiency, calculate the power of the heater in kW. The heater is left on for a further 30 minutes. If the latent heat of vaporisation of water is 2260 kJ/kg, calculate the mass of water vaporised. Again, assume no heat loss to the surroundings. c)
Transcribed Image Text:A tank contains 50 litres of water at 20°C. An electrical heating element is switched on and the temperature increased to 100°C without boiling the water. 8. a) If the heat capacity of water is 4.2 kJ/kg K and the density of water is 1000 kg/m², calculate the energy in kJ required to carry out this heating. Assume no heat loss to the surroundings. b) The heating operation takes 26 minutes. Assuming 100% heater efficiency, calculate the power of the heater in kW. The heater is left on for a further 30 minutes. If the latent heat of vaporisation of water is 2260 kJ/kg, calculate the mass of water vaporised. Again, assume no heat loss to the surroundings. c)
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