Steam Extract - Heat Recovery - CR4 Discussion Thread

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Food Engineering Participant Join Date: Mar 2013 Posts: 1	Steam Extract - Heat Recovery 03/16/2013 3:12 AM
	Hello, I have a number of large cooker extracts and know the volume and temperature of the steam exhaust but what I am trying to design is a large heat exchanger that will totally condense the steam back to liquid and in exchange heat water to be stored for hygiene. Any suggestions or direction to a design site?
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PWSlack Guru Join Date: Jan 2007 Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on. Posts: 32175 Good Answers: 839	#1 Re: Steam Extract - Heat Recovery 03/16/2013 6:26 AM
	Look at the flowrate and temperature of the steam. Work out the total possible rate of recovery of the energy by using Steam Tables. Compare that with its value in terms of the value of the energy supplied from elsewhere. Then make a judgement as to whether or not it is worthwhile recovering it before proceeding further. __________________ "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
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phoenix911 Guru Join Date: Aug 2007 Posts: 23647 Good Answers: 420	#2 Re: Steam Extract - Heat Recovery 03/16/2013 9:35 AM
	A condenser, but the information you supply we cannot give you an intelligent estimate or suggestion. What is the lbs of steam available you want to condense? What themperature of water do you want? __________________ “ When people get what they want, they are often surprised when they get what they deserve " - James Wood
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MJCronin Power-User Join Date: Oct 2009 Location: Central Midwest Posts: 455 Good Answers: 38	#3 Re: Steam Extract - Heat Recovery 03/16/2013 2:14 PM
	The device you are interested in is called a "waste heat boiler", economizer or recuperator... Attempting to condense exhaust steam will change the amount of flow above the cookers. As the steam condenses, it occupys less volume, induces a slight vacuum and pulls gaseous flow from whatever direction possible. This may reduce the draft ( pull above the cookers. It is considered wise to "leave some heat on the table" ( you cannot take out all of the heat from the stream or you will not get adequate draft. Pre-heating of inlet water streams is considered to be a good application for this waste heat. Be prepared for increased corrosion on the surfaces of this new heat exchanger. Have a properly designed condensate drainage system. I assume that there are non-condensibles and that there must be adequate draft for the cookers after the modification. What are your temperatures and volumes ? How did you measure the steam volume ? __________________ We have met the enemy....and he is us. POGO
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MJCronin (1); phoenix911 (1); PWSlack (1)

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Steam Extract - Heat Recovery