Waste heat evaps on yachts

Alfa Laval

I don't know if this has reached any yachts. They would need to be fairly large I believe to support technology like this, but Alfa Laval does make such units for large ships and offshore rigs.

Desalt fresh water generators

They work just fine. I have used the Maxim units referenced in the link below on yacht sized vessels. They ran off generator coolant and were great little units. They knew when there was enough heat to make water and when there wasn't and sent good water to the tanks and bad water overboard.

http://www.maximevaporators.com/products.html

There are also several manufacturers of plate type evaps like the Nirex distillers mentioned in the previous post but I have no experience with their smaller units, though they are available down to 4 or 5 hundred gallons per day. The large ones are fantastic, easy to use, require little service, come online quickly and are easy to automate.

If you consider the operational pattern of most yachts, there are not many places a low temperature evaporator should be used. The boat spends most of its life floating in sewage at a dock and rarely goes far enough offshore or long enough to get away from contaminated feedwater. While an RO unit "filters" out bacteria and even most viruses, the low temperature process of a distiller makes incredibly pure water from a chemical standpoint but it can carry a load of nasty organisms from the feedwater and requires very good post-treatment to ensure safe drinking water.

If I were outfitting a yacht for an extended world cruise I would seriously consider an evaporator or two in addition to an RO. After all, the energy to run it is "free" and it doesn't need the TLC and expensive consumables an RO demands.

Hi,

I imagine you must be bored and trying to see if there is anyone else awake on here with that statement

While I agree there is no additional fuel cost with the use of this "energy" it has actually cost the ship Owner and or operator money to produce and if it were not used for this would be pumped over the wall anyway.

This therefore could be looked at as a form of recycling on yachts..... it has to start somewhere.

Woke you up did it?

No additional cost because the heat was going over the side anyway, and the cost of fuel to make electricity to run an RO stays in the owner's pocket.

It certainly is recycling. If we monitored energy use on yachts like we do on ships we would see the plant efficiency go up a notch when the waste heat evap was on vs the RO. That is why we use waste heat boilers to make steam to drive turbine generators, heat the hotel, and replace electricity for a number of other heating jobs. Fuel tanks hold lots of little dollar bills. Heat going up the stack or over the side is little dollar bills fluttering away. The more we capture the longer the tanks stay full.

Hi,

No some nameless cretin did that with the phone at 0550 this morning so I have already been awake for a few hours getting ready to head back to the real world- If that is what I do for a living can be called.

Hope all is as well as can be. Also hope you are stopping by on your way back.

Hi,

You would not be able to do this on a UK Flagged Vessel where UV Sterilization is only suitable for use as the water goes to the consumers NOT before it goes into the storage tanks.

Hi,

It is not specifically banned as such, an auto chlorinator or Silver Ion treatment system must be fitted to all new ones since 1986 or if your boat is older and doesn't have one fitted a regular chlorine dosing routine must be applied.