PeterAX Posted April 29, 2021 Author Report Posted April 29, 2021 (edited) The text below is a copy of our post of 03/12/2021 04:41 PM. (The text below has been published many times in this forum topic.) ---------------------------- Have a look again at the book "Solved Problems in Physics", 2004, Volume 2, p. 876, solved problem 12.97. The author of this book is Prof. S. L. Srivastava (Ph.D.) The same book can be found at the link https://books.google.bg/books?id=rrKFzLB9KQ8C&pg=PA876&lpg=PA876&dq=%22electrochemical+equivalent+of+hydrogen%22&source=bl&ots=tQ8PSMLet3&sig=ACfU3U2HOLB78XHl2o3q-JanapzSK-McJA&hl=bg&sa=X&ved=2ahUKEwjDpp2-zZXhAhWT5OAKHUfuBzUQ6AEwBHoECAkQAQ#v=onepage&q=%22electrochemical%20equivalent%20of%20hydrogen%22&f=false -------------------------- For your convenience I am giving below the text of the problem and its solution. -------------------------- 12.97. In the electrolysis of sulphuric acid solution, 100 mg of hydrogen is liberated in a period of 20 minutes. The resistance of the electrolyte is 0.5 Ohm. Calculate the power consumed. Electrochemical equivalent of hydrogen is 1.044 x 10 -8 kg/C. SOLUTION. Prof. S. L. Srivastava's solution is given below. Prof. S. L. Srivastava's solution consists of two lines only. LINE 1. Current through the electrolyte is given by I = (m)/(Z x t). LINE 2. Power consumed = (I) x (I) x (R) = ((m)/(Z x t)) x ((m)/(Z x t)) x (R) = 31.86 W. --------------------------- Prof. S. L. Srivastava stops here his calculations. (The related solution's set of equations is not given here in order to save time and space. This set of equations however can be found in the book or in the link above.) -------------------------- WE DEVELOPED FURTHER PROF. SRIVASTAVA'S SOLVED PROBLEM IN A NON-STANDARD MANNER. OUR FURTHER DEVELOPMENT OF PROF. SRIVASTAVA'S SOLVED PROBLEM LED TO COP > 1. HERE IS THE ESSENCE OF OUR APPROACH. -------------------------- 1) Let us calculate the inlet energy, that is, inlet energy = (31.86 W) x (1200 s) = 38232 Ws = 38232 J. 2) The Joule's heat, generated in the process of electrolysis is given by Q = (I) x (I) x (R) x (t) = ((m)/(Z x t)) x ((m)/(Z x t)) x (R) x (t) = (31.86 W) x (1200 s) = 38232 Ws = 38232 J = outlet energy 1. 3) HHV of hydrogen is 142 000 000 J/kg. Therefore the heat H, generated by burning/exploding of 0.0001 kg of hydrogen, is given by H = (HHV) x (m) = (142 000 000) x (0.0001) = 14200 J = outlet energy 2, where m = mass of the released hydrogen HHV = higher heating value oh hydrogen 4) Therefore we can write down the equalities: 4A) outlet energy 1 + outlet energy 2 = 38232 J + 14200 J = 52432 J 4B) inlet energy = 38232 J. 5) Therefore COP is given by COP = 52432 J/38232 J = 1.37 <=> COP = 1.37 <=> COP > 1. ------------------------------ IMPORTANT NOTE. Constant pure water and cooling agent supply could keep constant the electrolyte's temperature, heat exchange, mass and ohmic resistance, respectively. Besides 0.0001 kg of hydrogen (and the related amount of the already split pure water) is small enough and can be neglected as a factor influencing the electrolyte's temperature, mass and ohmic resisitance. ----------------------------- And one more interesting fact. Literally the same solved problem can be found in an old Russian (still from the Soviet times) book "Сборник задач и вопросов по физике", 1986, p. 130, solved example problem 71. The authors of this book are Р. А. Гладкова and Н. И. Кутиловская. In the Russian version the data is a little different, that is, time is 25 minutes, the amount of generated hydrogen is 150 mg, Ohmic resisitance is 0.4 Ohm and the calculated power is 37 W. Russians also stopped their calculations at 37 W. Our further development of the Russian version led to the same COP = 1.37, that is, we have again the same COP > 1. ----------------------------- IMPORTANT NOTE. The text above must be evaluated (SOLELY AND ONLY!) by highly qualified experts (Ph.D.) in electric engineering. Otherwise nothing will come out of it. ----------------------------- Looking forward to your comments. Edited April 29, 2021 by PeterAX
PeterAX Posted May 5, 2021 Author Report Posted May 5, 2021 Prof. S. L. Srivastava's solution is given below. Prof. S. L. Srivastava's solution consists of two lines only. LINE 1. Current through the electrolyte is given by I = (m)/(Z x t). LINE 2. Power consumed = (I) x (I) x (R) = ((m)/(Z x t)) x ((m)/(Z x t)) x (R) = 31.86 W. ======================= I am asking a question: Is Prof. S. L. Srivastava's solution correct? Yes or no? Only one word -- either "yes" or "no"! ---------------------------------------- I am waiting for your answer. Only one word -- either "yes" or "no"!
PeterAX Posted May 7, 2021 Author Report Posted May 7, 2021 Still no comments? As if nobody in this forum wants to save some money while heating his/her house during winter season?
PeterAX Posted May 9, 2021 Author Report Posted May 9, 2021 (edited) Do you accept the validity of Prof. S. L. Srivastava's solution? Yes or no? (Only one word -- either "yes" or "no".) Edited May 9, 2021 by PeterAX
PeterAX Posted May 12, 2021 Author Report Posted May 12, 2021 Any standard water-splitting electrolyzer has a COP, which is bigger than 1. Why don't you accept this simple truth?
PeterAX Posted May 16, 2021 Author Report Posted May 16, 2021 Can't you accept the simple obvious truth that any standard water-splitting electrolyzer has a COP, which is bigger than 1?
PeterAX Posted May 18, 2021 Author Report Posted May 18, 2021 Any standard water-splitting electrolyzer has a COP, which is bigger than 1. Isn't there at least one brave member of this forum who dares to accept this simple obvious truth?
PeterAX Posted May 20, 2021 Author Report Posted May 20, 2021 Any comments related to our new electric heater concept?
PeterAX Posted May 21, 2021 Author Report Posted May 21, 2021 Still waiting for your comments related to our water-splitting electrolysis heater.
PeterAX Posted May 26, 2021 Author Report Posted May 26, 2021 COP > 1 for any standard water-splitting electrolysis process. Looking forward to your comments.
PeterAX Posted May 28, 2021 Author Report Posted May 28, 2021 Still no comments? Deep silence again?:)
PeterAX Posted May 31, 2021 Author Report Posted May 31, 2021 The text below is a copy of our post of 03/12/2021 04:41 PM. (The text below has been published many times in this forum topic.) ---------------------------- Have a look again at the book "Solved Problems in Physics", 2004, Volume 2, p. 876, solved problem 12.97. The author of this book is Prof. S. L. Srivastava (Ph.D.) The same book can be found at the link https://books.google.bg/books?id=rrKFzLB9KQ8C&pg=PA876&lpg=PA876&dq=%22electrochemical+equivalent+of+hydrogen%22&source=bl&ots=tQ8PSMLet3&sig=ACfU3U2HOLB78XHl2o3q-JanapzSK-McJA&hl=bg&sa=X&ved=2ahUKEwjDpp2-zZXhAhWT5OAKHUfuBzUQ6AEwBHoECAkQAQ#v=onepage&q=%22electrochemical%20equivalent%20of%20hydrogen%22&f=false -------------------------- For your convenience I am giving below the text of the problem and its solution. -------------------------- 12.97. In the electrolysis of sulphuric acid solution, 100 mg of hydrogen is liberated in a period of 20 minutes. The resistance of the electrolyte is 0.5 Ohm. Calculate the power consumed. Electrochemical equivalent of hydrogen is 1.044 x 10 -8 kg/C. SOLUTION. Prof. S. L. Srivastava's solution is given below. Prof. S. L. Srivastava's solution consists of two lines only. LINE 1. Current through the electrolyte is given by I = (m)/(Z x t). LINE 2. Power consumed = (I) x (I) x (R) = ((m)/(Z x t)) x ((m)/(Z x t)) x (R) = 31.86 W. --------------------------- Prof. S. L. Srivastava stops here his calculations. (The related solution's set of equations is not given here in order to save time and space. This set of equations however can be found in the book or in the link above.) -------------------------- WE DEVELOPED FURTHER PROF. SRIVASTAVA'S SOLVED PROBLEM IN A NON-STANDARD MANNER. OUR FURTHER DEVELOPMENT OF PROF. SRIVASTAVA'S SOLVED PROBLEM LED TO COP > 1. HERE IS THE ESSENCE OF OUR APPROACH. -------------------------- 1) Let us calculate the inlet energy, that is, inlet energy = (31.86 W) x (1200 s) = 38232 Ws = 38232 J. 2) The Joule's heat, generated in the process of electrolysis is given by Q = (I) x (I) x (R) x (t) = ((m)/(Z x t)) x ((m)/(Z x t)) x (R) x (t) = (31.86 W) x (1200 s) = 38232 Ws = 38232 J = outlet energy 1. 3) HHV of hydrogen is 142 000 000 J/kg. Therefore the heat H, generated by burning/exploding of 0.0001 kg of hydrogen, is given by H = (HHV) x (m) = (142 000 000) x (0.0001) = 14200 J = outlet energy 2, where m = mass of the released hydrogen HHV = higher heating value oh hydrogen 4) Therefore we can write down the equalities: 4A) outlet energy 1 + outlet energy 2 = 38232 J + 14200 J = 52432 J 4B) inlet energy = 38232 J. 5) Therefore COP is given by COP = 52432 J/38232 J = 1.37 <=> COP = 1.37 <=> COP > 1. ------------------------------ IMPORTANT NOTE. Constant pure water and cooling agent supply could keep constant the electrolyte's temperature, heat exchange, mass and ohmic resistance, respectively. Besides 0.0001 kg of hydrogen (and the related amount of the already split pure water) is small enough and can be neglected as a factor influencing the electrolyte's temperature, mass and ohmic resisitance. ----------------------------- And one more interesting fact. Literally the same solved problem can be found in an old Russian (still from the Soviet times) book "Сборник задач и вопросов по физике", 1986, p. 130, solved example problem 71. The authors of this book are Р. А. Гладкова and Н. И. Кутиловская. In the Russian version the data is a little different, that is, time is 25 minutes, the amount of generated hydrogen is 150 mg, Ohmic resisitance is 0.4 Ohm and the calculated power is 37 W. Russians also stopped their calculations at 37 W. Our further development of the Russian version led to the same COP = 1.37, that is, we have again the same COP > 1. ----------------------------- IMPORTANT NOTE. The text above must be evaluated (SOLELY AND ONLY!) by highly qualified experts (Ph.D.) in electric engineering. Otherwise nothing will come out of it. ----------------------------- Looking forward to your comments.
Recommended Posts