Waste Heat Refrigeration
Waste Heat Refrigeration
(OP)
Where I work we provide heating for systems such as industrial heating, process heating, greenhouses, etc. Often times our clients burn fuel (such as wood) to minimize disposal costs. However, when the heat load is small, like in the summer, they cannot simply burn it, as they have no means of 'getting rid' of the heat. I was instructed to look at absorption refrigeration to use this potential waste heat to cool their buildings to 22degC in the summer.
The heat output of a typical system is ~15mmbtu/hr. 1 ton of refrigeration is 12,000btu/hr. Does that mean that we can provide 1000 refrigeration tonnes?
This is not my area so can anyone tell me if I am over looking something(s) in this calculation I would really appreciate it.
The heat output of a typical system is ~15mmbtu/hr. 1 ton of refrigeration is 12,000btu/hr. Does that mean that we can provide 1000 refrigeration tonnes?
This is not my area so can anyone tell me if I am over looking something(s) in this calculation I would really appreciate it.





RE: Waste Heat Refrigeration
Something about no process being 100% efficient.
RE: Waste Heat Refrigeration
The second law of thermodynamics: you can't even break even
I think the paydown for absorption systems running on recovered heat will be way more than 10 years.....return is better on T-bonds.
RE: Waste Heat Refrigeration
The reason I ended up posting was I got a budget quote and the price was so high I couldn't believe it. Which goes along with what willard3 said, so I guess it was acceptable.
Thanks for the help though
RE: Waste Heat Refrigeration
The operation of absorption may be a different topic. There is a long ramp up and a long ramp down for a lot of this euqipment...it suits a campus-central system arrangement but the delivery of waste fuel may not follow any pattern that would yield continuity to the process. And the fuel prepping and processing itself will be a considerable investment.
RE: Waste Heat Refrigeration
Everyone I have talked to has given me the impression that absorption cooling is not a practical option for us.
Thanx for everyone's help.
RE: Waste Heat Refrigeration
RE: Waste Heat Refrigeration
In this particular case elec. generation has not been mentioned (b/c of the hot water). We do have some potential projects where staffing is available to meet the regulations to produce steam. Often times producing elec. power from is not feasible because we have no heat load for 6 months of the year. We are starting to look at condensing turbines/cooling towers to overcome this but capital cost is too high...but with energy costs increasing this is option is looking better.
If we could use the heat for cooling(or else?) we would have a use for the heat year round and the system would become more economically practical.
RE: Waste Heat Refrigeration
Check out this website:
http://www.energy-concepts.com/
RE: Waste Heat Refrigeration
I have two gas engine driven power plant of 1.4 MW each generating 4.0 TPH of 8.0 bar steam and 300 TR of chilling from engine jacket cooling water at 80 deg.C.
This system can be called a trigeneration system as it generates electricity, steam and cooling.
Absorption chiller can make very good economic sense if your power cost is high. In India, many plants are coming up with trigeneration system.
Regards
Dinesh
RE: Waste Heat Refrigeration
RE: Waste Heat Refrigeration
RE: Waste Heat Refrigeration
The dude who ran the room was ex-german submarine capt.
RE: Waste Heat Refrigeration
HVAC68
RE: Waste Heat Refrigeration