A completely insulated mixing vessel is designed to deliver water at 60 ⁰C and atmospheric pressure at a rate of 4 kg/s by mixing two streams of incoming water in an environment at 25 ⁰C. Saturated steam at atmospheric pressure is inserted on the hot side. Two options are being considered for the cold side: (a) chilled water from the plant at 3 ⁰C or (b) water from the tap at 20 ⁰C (both at atmospheric pressure). (i) Determine the mass flow rate of steam and chilled water in each case. (ii) Determine the thermal efficiency of each process. (iii) Determine the exergetic efficiency of each process, defined here as exergy out divided by exergy in. (iv) Based on the previous answers, discuss which process makes better use of available resources and why.
A completely insulated mixing vessel is designed to deliver water at 60 ⁰C and atmospheric pressure at a rate of 4 kg/s by mixing two streams of incoming water in an environment at 25 ⁰C. Saturated steam at atmospheric pressure is inserted on the hot side. Two options are being considered for the cold side: (a) chilled water from the plant at 3 ⁰C or (b) water from the tap at 20 ⁰C (both at atmospheric pressure). (i) Determine the mass flow rate of steam and chilled water in each case. (ii) Determine the thermal efficiency of each process. (iii) Determine the exergetic efficiency of each process, defined here as exergy out divided by exergy in. (iv) Based on the previous answers, discuss which process makes better use of available resources and why.
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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Question
A completely insulated mixing vessel is designed to deliver water at 60 ⁰C
and atmospheric pressure at a rate of 4 kg/s by mixing two streams of incoming
water in an environment at 25 ⁰C. Saturated steam at atmospheric pressure is
inserted on the hot side. Two options are being considered for the cold side: (a)
chilled water from the plant at 3 ⁰C or (b) water from the tap at 20 ⁰C (both at
atmospheric pressure).
(i) Determine the mass flow rate of steam and chilled water in each case.
(ii) Determine the thermal efficiency of each process.
(iii) Determine the exergetic efficiency of each process, defined here as exergy out
divided by exergy in.
(iv) Based on the previous answers, discuss which process makes better use of
available resources and why.
and atmospheric pressure at a rate of 4 kg/s by mixing two streams of incoming
water in an environment at 25 ⁰C. Saturated steam at atmospheric pressure is
inserted on the hot side. Two options are being considered for the cold side: (a)
chilled water from the plant at 3 ⁰C or (b) water from the tap at 20 ⁰C (both at
atmospheric pressure).
(i) Determine the mass flow rate of steam and chilled water in each case.
(ii) Determine the thermal efficiency of each process.
(iii) Determine the exergetic efficiency of each process, defined here as exergy out
divided by exergy in.
(iv) Based on the previous answers, discuss which process makes better use of
available resources and why.
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