Capture waste heat from diesel electric generators

In summary, a cogeneration plant can be used to heat water for a small hotel, using engines to recover heat. The plant is likely commercially viable, but needs a specialist to visit the site to determine this.
  • #1
paulo
6
0
Need help to find a way to capture waste heat from diesel electric generators (45 KW) to heat water for small hotel use (45 rooms + kitchen). Exploring all options: jacket water, oil, exhaust. Anyone please help.
 
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  • #2
Look up CHP plants; your idea is readily available and commercially viable.

If you already have the generator, you'll likely be looking at the following:

Boiler to capture exhaust heat
Heat exchanger(s) to capture jacket water heat

If the engine has an oil cooler, you'll be able to capture heat from that too; it probably uses the jacket water circuit anyway.
 
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  • #3
Thank you for the input. Do you know if this piece of equipment useful for both the water and the oil?
http://www.heatexchangers.ca/pl.html
 
  • #4
Possibly. It depends on how you're going to run the engine, and the heat/hot water requirements of the building. You also need to factor in what you're using to back up / supplement the engine when it's not running.

Those heat exchangers are the right kind of thing though.

Are you doing this project yourself, or getting a cogen specialist in?
 
  • #5
Dont know of a cogen specialist to contact, are you such a person?
 
  • #6
Well I regularly work with such systems, but can't come out and specify, quote for, and install such a thing for you!

What country are you in? I'll see about recommending some companies to talk to.
 
  • #7
have 3 diesel engines. 2 are 45 kw gens and one is 120 kw. one of them is running at all times in a 24 h cycle. hot water is for a 45 room rural hotel + kitchen. water does not need to be above 60 celsius. someone also mentioned running exhaust gases into a hot water heater. and hot water into an insulated tank for holding and recirculating in the hot water insulated pipe network the hotel has. hotel is near sea, water has 2600 ppm solids.
 
  • #8
hotel is in tulum, mexico. tulum is 130 kms, 1.5 hours from cancun airport.
 
  • #9
need a vacation? maybe we can barter.
 
  • #10
Well you don't want to use seawater!

If you're planning on using existing engines then I take it you've already got boilers and want to use the engines to supplement these? The exhaust boiler is an extremely good way of recovering heat, along with jacket water. Do the engines not already have oil coolers?

In any case, you need a specialist to visit the site. I don't know of any in Mexico, I'm sure an internet search would yield some positive results though (search for cogeneration, trigeneration, combined heat and power, CHP etc). Firstly, they'll be able to tell you whether such a project is economically viable (based on heat requirements of the hotel, fuel costs, electricity prices and capital). Secondly, they'll be able to advise of the best solution to suit your needs, based on all the above factors, plus the type of engines, their location on the site, what the electricity is used for, and the heat demand profile of the building. Thirdly, they'll be able to specify, design, commission and maintain the plant.


Yes I do need a vacation. Specifying a cogen plant doesn't sound like much of one to me though!
 

1. How does capturing waste heat from diesel electric generators work?

Capturing waste heat from diesel electric generators involves using a heat recovery system to collect and store the excess heat produced during the generator's operation. This heat can then be used for various purposes, such as heating buildings or water.

2. What are the benefits of capturing waste heat from diesel electric generators?

Capturing waste heat from diesel electric generators can lead to significant energy and cost savings. It also reduces the environmental impact of the generator by decreasing the amount of fuel needed to produce the same amount of energy.

3. Can waste heat from diesel electric generators be used for other purposes?

Yes, waste heat from diesel electric generators can be utilized for a variety of purposes, such as heating water, buildings, or even powering other equipment through a heat-to-power conversion process.

4. Are there any limitations to capturing waste heat from diesel electric generators?

One limitation is the initial cost of installing a heat recovery system, which may be expensive. Additionally, the efficiency of the heat recovery system may depend on the specific conditions and design of the generator.

5. How can I determine if capturing waste heat from diesel electric generators is feasible for my situation?

It is best to consult with a professional to assess the feasibility of capturing waste heat from diesel electric generators for your specific situation. Factors such as the size and type of generator, energy needs, and available space for a heat recovery system should be considered.

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