5. An electric water heater has a capacity of 2 liters. In this heater, the water is initially found as a saturated liquid at 150 kPa. When the water is in this state, the heater automatically turns on and heats the water, which expands at a constant pressure through a movable cover mechanism at the top of the heater, which has an associated work done by the system (Ws). Additionally, the electrical resistance supplies 2.2 MJ to the water. These types of heaters have very good thermal insulation and the surroundings are at normal conditions (25°C and 100 kPa). Based on this information: a) Determine the states of the working substance. b) Determine the minimum work (Wmin) with which the process can be carried out. c) Determine the exergy destroyed during this process.

5. An electric water heater has a capacity of 2 liters. In this heater, the water is initially found as a saturated liquid at 150 kPa. When the water is in this state, the heater automatically turns on and heats the water, which expands at a constant pressure through a movable cover mechanism at the top of the heater, which has an associated work done by the system (Ws). Additionally, the electrical resistance supplies 2.2 MJ to the water. These types of heaters have very good thermal insulation and the surroundings are at normal conditions (25°C and 100 kPa). Based on this information: a) Determine the states of the working substance. b) Determine the minimum work (Wmin) with which the process can be carried out. c) Determine the exergy destroyed during this process.

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.

Chapter6: Forced Convection Over Exterior Surfaces

Section: Chapter Questions

Problem 6.8P

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