Imagine, this.. My water solar array has a cold & hot storage. Now the storage is in two different places, and very well insulated. My plan is to use all the wasted heat from the heat exchanger off the Ammonia system to supplement the water solar array. Now this would obvious be hooked up to the cold storage side of the array. The temps off the internals box ( Where the flame is is close to 270 degrees) It's very small in surface area. I know it's not much heat off the ammonia system but it add up. My tanks are underground.. It's an old septic system I cleaned. That was a nasty job.. The previous owner had two big septic tanks. Old one, built in the 50's still in good shape but had leaks. and the second one built in the 80's.. I have One 750 Gallon and 1000 Gallon tanks in each septic hole.. Now these were old boilers tanks. These tanks came with Amtrol expansion tanks. and all the guages, controls were Antune. It was to much control for me but I will find a use for some of the controls someday One nice thing about these tanks. They have no leaks. They had an Inspection tag. It pass all test. They were replaced only to get more efficent units.
As a quick answer: It will work where generator temperatures are greater than ambient (WB, if evaperator cooling is employed) by any amount greater than the difference between Ambient DB and the refrigeration Evaporating Temperature....
That is a quick calc and will leave some portion of the system working at a sub atmospheric pressure, which of course leads to some terrible heat transfer conditions, thus a very large condensing heat exchanger, if the heat rejection for the "weak" vapor is to the ambient.
The "weak" condenser will obviously be at positive pressure for PP-Equivalent condensing above 100 Deg. C.
With a lot of waste heat and a ready source of cooling water, they can be made to work at 130 Deg. C. waste heat temperature.
Economical? Scale will be a very large player in one designed for 130 Heat Source, and its still not going to be a very flexible system, would need a lot of controls. Or if you think about it. Another way would be a very small kerosene flame, Hydroxy Flame, Candle, Bio Diesel
Non-electric appliances such as a gas refrigerator / freezer are must-have items for "off-the-grid" sustainable living. When you're generating your own electricity, it's not cost effective to operate large "energy hog" conventional electric kitchen appliances. In order to keep your photovoltaic array and battery collection at a reasonable size, you'll need to buy an all-gas range, a gas hot water heater, and a non-electric refrigerator. Inverters and generators simply can't be run non-stop and expected to last for any length of time. Gas powered absorption cooling systems are very quiet and much more dependable than an electric refrigerator with no compressor or other moving parts to ever wear out. A tiny pilot light is all that's needed to keep your food cold without electricity!