Water Heating Efficiency

Go to Spirax Sarco site www.spiraxsarco.com and look up for 3-way Mixing Temperature control Valve with Sensor. Each of these valves will have 3 ports. Port A - cold water, Port B - steam, Port AB - mixed hot water at desired temperature 50c, 60c, 70c, 80c, 82c, 92c or whatever depending on the sensor range that you select.Since you are not returning condensate but using direct injection system for heating up one tank therefore they will all take direct steam injection mixing with the cold water.These will be mechanical valve with oil filled capillary for the sensor. A one time fit & forget equipment and should be ideal for your application of controlling at different set temperature.

Hi whezmabeer,

Direct steam injection is always more efficient than a heat exchanger. If you can live with the added water, I would go with that.

Mike

What is your quantity in gallons of water per minute for each temp. What is your starting temp. Do you need to bring any return water back to the boiler. Answer these questions and I will size a "one way" hot water boiler that will take 100% make-up with out chemical treatment or concern.

Email direct to miketheboilerguy@aol.com

Let me know what you are using the water for too please.

Thanks

mike how come you are coming as a guest?

to achieve different temperature, permanent solution is to use boiler temperature controller which can control desire temperature of more than one boiler at a time. for more information contact concurrent engineering solutions. contact kamal thummar email: thummarkamal@gmail.com kamal@cosmosindia.net

The present system looks simple and good. Your proposal of heating the water at 70c and then further heating at the point of use would definitely reduce heat losses if the quantity of water is signifiant and you are in a cold climate.

I would prefer these alternatives to the heat exchanger to heat water and return condensate to save on water treatment cost. This would be advisable if you are using ground water with very high hardness and your water treatment costs are high.

We have a 8MW steam boiler which is used for processes other than heating water. We are not in a position to buy a hot water boiler. The places that the higher temp water is required, has steam pipes in the area, so basically I am asking if it would be more efficient to have direct steam injection into smaller tanks at the use point. If we go for heat exchangers then we will have to install condensate return pipes.

Our water for the Boiler is not too bad and chemical costs are not that high.

Direct steam injection at point of use would be definitely the most efficient system.

In case of hot water boiler, you will gain on heat losses but lose on pumping depending on distance. Also, you will need to invest in hot water boiler and piping. Even maintnance wise, direct steam injection would be ideal.

whezmabeer = where's my beer...is it? coz i'm wondering myself.

mate, I'm still looking for my beer. I always seem to out it down and lose it. Half full stubbies often found at my place.

Is also a name I use on Planet Rugby.

Hello whezmabeer,

Sounds like a pretty good offer from "Mike the boiler guy? And there have been other interesting posts as well.

Good luck

bb

Hi bb,

isn't mine interesting? it's hot out there at the moment.

Hello Isti80,

I do not recall 'talking to you before. How are you?

And, of course your posts are interesting! Just that I was getting tired of typing and could not recall everyones names, you know?

And BTW, is does sound like the OP is asking a question, "where my beer"?!

Seems pretty slow today, but, then most peeps will be on holiday or at work at this time?

Take care...........

bb

Hi bb,

Howdy?

I am very disappointed that you don't remember me . You're the one who made a positive remark about my comment 'I hate political correctness' remember?

Doesn't matter it was long ago and who wants to know it anyway.

Today and yesterday we had nice sunny days in London (UK) and the 'where's my beer' was an apt question I thought after seeing the OPs avatar title.

cheers

Hello Isti80,

I do kind of recall you know, or that should be, I recall the threads you mention.

This is not a 'slap in the face' (the way I have phrased it), but, there is two reasons why I find it hard to recall.

1) I kept copies of all answers given and all correspondence on my windows XP computer, which is now not working at all. I cannot even load a copy of XP onto it.

2) I had a nervous breakdown about two months ago and my short term memory is even worse!

The reason I kept a ref' to any correspondence is so I can get back to those people, Unfortunately, on trying to copy the letters and files from my email account, everything froze on my computer and, on the 'stick' I was recording to. Sorry. I will keep in touch with everyone I am in touch with from now on.

Take care..............bb

How you feeeling now, are you OK? I was wondering lately why you not participating. I suppose life can be quite fragile at times so much so that we can loose each other at the blink of an eye without even realising it, despite the advent of the internet.

There was a man once, about a couple of years ago, he asked a question on 'how to use Oscilloscope' and he had what I could gather a physical disability because he had a seven year old assistant to help him even to type his question and his answers. Later, I have tried to get hold of him, with the help of another cr4 member, but I haven't been able to and I feel it's sad.

Hi Isti80,

how are you?

Yes life can seem a little fragile at times for sure! I cannot manage the clever stuff yet! LOL! But I will get there!

bb

How much heat is going up the chimney of your steam boiler? You are heating your boilers makeup water because you have no condensate return and you are also heating this process water. I would suggest preheating this water with the waste heat that is going up the chimney with a Sidel SRU flue gas condenser. The gas that came down the boilers gas train the company bought. The heat that is is being vented up the chimney the company also bought. Make this boiler operate as efficient as a condensing boiler and utilize every last BTU possible by putting this flue gas heat into this water stream. The condensate that will be created from this heat recovery process can also be treated and used as boiler feed water.

For every decatherm of energy that is recovered from these waste flue gases and utilized back in the facility, 118 lbs of CO2 will NOT be emitted into the atmosphere. Help your company to also reduce it's carbon footprint.

The air temp leaving the Boiler stack is anywhere from 180-245 oC. It was suggested to use this air to preheat the water, but wasn't sure how to go about it.

With Australian Govt pushing their CPRS for 2010 or 2011, the return on installing efficiient energy sytems will increase. It is timely to investigate.

Hi Whezmabeer

Contact me thru www.sidelsystems.com We can help you to increase your boilers energy efficiency hopfully to well over 90%, reduce your companies carbon footprint, preheat your boilers makeup water and your process water, and produce some blue -gold to reduce your companies water consumption.

I look forward to hear from you.