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A high temperature heat pump comprising a low temperature heat exchanger to produce vapor of a first fluid from heat transferred from a second fluid to a mixture of liquid and vapor of the first fluid; a compressor to increase the pressure and temperature of the produced vapor; a high temperature he

A high temperature heat pump comprising a low temperature heat exchanger to produce vapor of a first fluid from heat transferred from a second fluid to a mixture of liquid and vapor of the first fluid; a compressor to increase the pressure and temperature of the produced vapor; a high temperature heat exchanger to heat the second fluid to useful, high temperatures from the condensation of the first fluid; and an expander to lower the pressure and temperature of the first fluid producing a mixture of vapor and liquid.

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1. A high temperature heat pump comprising:a) a low temperature heat exchanging means for producing vapor from a first fluid using heat transferred from a second fluid to a mixture of liquid and vapor of the first fluid,b) a compressing means for receiving the produced vapor to increase the pressure

1. A high temperature heat pump comprising:a) a low temperature heat exchanging means for producing vapor from a first fluid using heat transferred from a second fluid to a mixture of liquid and vapor of the first fluid,b) a compressing means for receiving the produced vapor to increase the pressure and temperature of the produced vapor,c) a high temperature heat exchanging means for receiving the second fluid to heat the second fluid,d) an expansion means for lowering the pressure and temperature of the first fluid to produce a mixture of vapor and liquid of the first fluid,e) wherein the second fluid is vaporized in the high temperature heat exchanger, there being additional load defining means for receiving said second fluid vapor.2. The high temperature heat pump of claim 1 where the expansion means is a two-phase turbine generating useful power from the expansion.3. The high temperature heat pump of claim 1 where the expansion means is an expansion valve.4. The high temperature heat pump of claim 2 where the two-phase turbine is mechanically attached to a motor or a compressor shaft of the compressing means to reduce the required compressing power.5. The high temperature heat pump of claim 1 where the first fluid is refrigerant R245a.6. The high temperature heat pump of claim 1 where the second fluid is water.7. The high temperature heat pump of claim 1 where the second fluid is recycled.8. The high temperature heat pump of claim 1 wherein said first fluid consists essentially of refrigerant R245a.9. The high temperature heat pump of claim 1 wherein said second fluid consists essentially of water.10. The high temperature heat pump of claim 8 wherein said second fluid consists essentially of water.11. The high temperature heat pump of claim 1 including recycling means for recycling said second fluid from the output side of said high temperature heat exchanger to the input side of said high temperature heat exchanger.12. The method of operating heat pump apparatus which comprises:a) providing and operating first means including a low temperature heat exchanger receiving first and second fluids for producing a vapor of the first fluid by heat transfer from the second fluid to a mixture of fluid and vapor of the first fluid,b) providing and operating second means including a compressor connected with the first means to receive said first fluid vapor for compressing said vapor, thereby increasing the pressure and temperature of said first fluid,c) providing and operating third means including a high temperature heat exchanger for receiving the second fluid and said first fluid compressed vapor for heating the received second fluid by heat from condensation of the first fluid vapor,d) providing and operating fourth means including an expansion means for receiving the first fluid vapor condensate and for lowering the pressure and temperature of said first fluid and producing said mixture of liquid and vapor of the first fluid,e) wherein the second fluid is vaporized in the high temperature heat exchanger, there being additional load defining means for receiving said second fluid vapor.13. The method of claim 12 wherein said expansion means comprises a power generating two-phase turbine.14. The method of claim 13 wherein said turbine drives an electric generator.15. The method of claim 12 wherein said second fluid consists essentially of water.16. The method of claim 12 wherein said second fluid comprises water, and said second fluid vapor comprises steam.17. High temperature heat pump apparatus comprising, in combination:a) first means including a low temperature heat exchanger for receiving first and second fluids for producing vapor of the first fluid by heat transfer from the second fluid, said first fluid as received by that heat exchanger being a waste fluid,b) second means including a compressor connected with the first means for receiving said first fluid vapor for compressing said vapor, thereby increasing the pressure and temperature of the first fluid,c) third means including a high temperature heat exchanger for receiving the second fluid and said first fluid compressed vapor for heating the received second fluid by heat transfer from condensation of the first fluid vapor, andd) fourth means including an expansion means for receiving the first fluid vapor condensate and for lowering the pressure and temperature of said first fluid and producing said mixture of liquid and vapor of the first fluid,e) wherein the second fluid is vaporized by heat transfer in the high temperature heat exchanger, there being additional load defining means for receiving said second fluid vapor.18. The combination of claim 17 wherein said expansion means comprises a power generating two-phase turbine.19. The combination of claim 18 including an electrical generator driven by said turbine.20. The combination of claim 18 wherein said expansion means comprises a liquid expansion valve.21. The combination of claim 18 wherein said compressor is driven by power produced by the turbine.22. The combination of claim 19 including a motor receiving power from said generator and operatively coupled to said compressor.23. A high temperature heat pump comprising:a) a low temperature heat exchanging means for producing vapor from a first fluid using heat transferred from a second fluid to a mixture of liquid and vapor of the first fluid,b) a compressing means for receiving the produced vapor to increase the pressure and temperature of the produced vapor,c) a high temperature heat exchanging means receiving the second fluid to heat the second fluid to,d) an expansion means for lowering the pressure and temperature of the first fluid produce a mixture of vapor and liquid,e) wherein the second fluid is vaporized in the high temperature heat exchanger, there being additional load defining means for receiving said second fluid vapor,f) said compressing means and expansion means being rotary devices rotatively coupled together, and including a motor rotatively coupled to at least one of said devices.24. The high temperature heat pump of claim 23 wherein said second fluid comprises water, and said second fluid vapor comprises steam.25. The high temperature heat pump of claim 24 wherein said additional means comprises a system selected from the group consisting of:vi) a heating systemvii) a building heating systemviii) a building heating system also served by a district heating systemix) a building heating system also served by a boilerx) an industrial process employing heat input.