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Home > Forums > Mechanical Engineers > Activities > HVAC/R engineering Forum

Kitchen Drain Heat Recovery

Read More Threads Like This One

carlosgw (Mechanical)

14 Mar 12 16:43

An architect wanst to use waste heat from a commercial kitchen drain to heat fluid for a small sidewalk snow melt system. It sounds like a bad idea but I feel like I have heard of it before.
Even taking the drainage directly from a dishwasher - I would think grease would be a problem.
Any one heard of the application?

MintJulep (Mechanical)

14 Mar 12 16:48

I would start with a simple heat balance.

My guess is that will show it to be not viable.

SAK9 (Mechanical)

14 Mar 12 20:05

Bad idea as the grease would stick to the pipe once it has cooled down and will eventually choke the pipe.

GMcD (Mechanical)

14 Mar 12 23:15

I think he's another Google sound-bite ADHD architect who saw that GFX copper coil wrapped around the drain line to recover drainwater heat (http://gfxtechnology.com/). As a post above pointed out - do the energy balance and the capital cost of all that copper in the GFX coil and then compare the times that heat "might" be recovered from the warm drain pipe versus when the sidewalk needs heating. Back to basics....

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