A device expends 164.65 kJ of energy while pressurizing 8.391 kg of water initially at 17.68°C. The efficiency of the heating device is 68.7%. Inefficiencies are represented by a heat loss from the device casing. Determine the final temperature in °C.

A device expends 164.65 kJ of energy while pressurizing 8.391 kg of water initially at 17.68°C. The efficiency of the heating device is 68.7%. Inefficiencies are represented by a heat loss from the device casing. Determine the final temperature in °C.

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 8.19P

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Properties of Pure Substances

A substance with fixed chemical composition throughout is called a pure substance like water, air, and nitrogen. A pure substance does not have to be a single element or compound. A mixture of two or more phases of a pure substance is also a pure substance as long as the chemical composition is the same for all phases. These substances mainly have a constant/ uniform composition. The substances also have fixed boiling and melting points. A pure substance takes part in a chemical reaction to form predictable products.

Question

A device expends 164.65 kJ of energy while
pressurizing 8.391 kg of water initially at
17.68°C. The efficiency of the heating
device is 68.7%. Inefficiencies are
represented by a heat loss from the device
casing. Determine the final temperature in
°C.

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