EXPERIENCES WITH DOMESTIC HEAT PUMPS.

THE AUTHOR DISCUSSES THE PERFORMANCES OF VARIOUS PLANT AND CONCLUDES THAT WATER-WATER HEAT PUMPS ARE SUITABLE FOR MASS PRODUCTION AND GIVE THE MOST FLEXIBLE USE OF ENERGY. TESTS WERE CARRIED OUT ON GROUND WATER. BY USING AN EVAPORATOR AND A SPECIAL CONDENSER, THE POWER CONSUMPTION OF CIRCULATING PUMPS WAS DECREASED SIGNIFICANTLY. THE PRODUCTION OF HEAT PUMPS USING GROUND WATER WAS UNDERTAKEN IN DENMARK. THE EVAPORATOR HAS A LARGE SURFACE AREA, GIVING TEMPERATURE DIFFERENCES OF 5 K AT THE EVAPORATOR AND 1 K AT THE CONDENSER AND A CARNOT EFFICIENCY OF 0.6 AND 0.67 WITH SUBCOOLING.