District heating is an excellent market opportunity for Hybrid Energy Hybrid heat pumps with the working solution water and ammonia. District heating needs large capacity (MW) and usually high temperatures. Most competing heat pumps either have high system pressure, non-natural refrigerants or many smaller compressors in parallel. The hybrid solution have excellent COP and safe environmentally friendly and safe systems because of lower system pressure. BIG heat exchangers at high pressures, can be more unsafe.
The best high temperature heat pumps installations also have a high source temperature and high COP. Below is listed 5 different heat sources for use in hybrid heat pumps when the district heating system is close to the heat source.