Swiss Contributions to Heat Pump Technology and Other Links
 

These are just a few links related to refrigeration history I think are quite interesting. I encourage you to check them out and reply with any of your own. OpenLibrary is an excellent source for older texts. Don't be afraid to do a "refrigeration" search and date it prior to 1935. These books are rich with common sense theory and expertise hard to find in modern textbooks.

History of Heat Pumps Swiss Contributions and International Milestones

Household Refrigeration - 1924; I have two editions of this book. It is excellent.

SEWAGE WATER: INTERESTING HEAT SOURCE FOR HEAT PUMPS AND CHILLERS

HVACR Heritage Center of Canada; Amazing collection.

Practical Ice Making and Refrigerating - 1897

Refrigeration - 1913

The Refrigeration Compressor - The Steps to Maturity

A friend of mine made a household waste heat HP which used mostly exhaust for the the HRV (which he invented in the 70s) and drain water/sewage. He was too far ahead of his time......oh well.

I would like to build a wastewater heat recovery system for domestic hot water. I would think a high COP would be attainable. Any more details/pictures you can provide for your friend's heat pump? I'm definitely interested.

I'm working on it.....