electric water heater is fed with an input stream of 15.0 kg/min of water at 17.5°C. Hot water is then provided as two different output streams, one at 43.0°C ar ater in the tank remains constant and the mass flowrate of the outlet stream at 43.0°C is 10.5 kg/min. rform the following activities, i. ii. Draw a detailed flowchart for this process with all given information. Calculate the power, Q (in kW) that the electric heater must provide in order to keep the temperatures of the outlet streams at 43.0°C and at 60 d energy balances and show your calculation. ven:

electric water heater is fed with an input stream of 15.0 kg/min of water at 17.5°C. Hot water is then provided as two different output streams, one at 43.0°C ar ater in the tank remains constant and the mass flowrate of the outlet stream at 43.0°C is 10.5 kg/min. rform the following activities, i. ii. Draw a detailed flowchart for this process with all given information. Calculate the power, Q (in kW) that the electric heater must provide in order to keep the temperatures of the outlet streams at 43.0°C and at 60 d energy balances and show your calculation. ven:

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Concept explainers

Forms of Energy

Energy is described as the capability to accomplish a task, like the ability to push a block by applying force on it. It is a quantitative property that is used to accomplish work on an object.

Question

An electric water heater is fed with an input stream of 15.0 kg/min of water at 17.5°C. Hot water is then provided as two different output streams, one at 43.0°C and the other at 60.0°C. The volume of the
water in the tank remains constant and the mass flowrate of the outlet stream at 43.0°C is 10.5 kg/min.
Perform the following activities,
i.
Draw a detailed flowchart for this process with all given information.
ii.
Calculate the power, Q (in kW) that the electric heater must provide in order to keep the temperatures of the outlet streams at 43.0°C and at 60.0°C, respectively. You must write the mass
and energy balances and show your calculation.
Given:
AH + AĖK + AĖ, = Q – W, where AH stands for the difference in enthalpy;
ΔΗ- ΣΗoal -ΣΗit ial s
As AH = H; – H,ref = mC,(T; – Tref), if the reference temperature Tref is
selected as 0°C, the absolute enthalpy is given by AH¡ = H¡ = mC,T-
%3D
-
%3D
k]
The specific heat of water is constant and is 4.182
within the range of
kgºC
temperature from 0°C to 100°C.
The kinetic and potential energy are negligible in this process.

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