Objective
A THERMO-ELECTRIC HEAT PUMP HAS BEEN DEVELOPED WHICH IS BASED ON THE PELTIER EFFECT. WHEN TWO DIFFERENT METALS FORM A CIRCUIT, A CURRENT IN THAT CIRCUIT WILL INDUCE A TEMPERATURE DIFFERENCE BETWEEN THE TWO METAL INTERFACES (PELTIER EFFECT). SUCH THERMO-ELEMENTS WERE PRODUCED WITH TWO TYPES OF PELLETS WHERE ONE INTERFACE IS CONNECTED WITH A HEAT EXCHANGER WHICH EXTRACTS WASTE HEAT FROM EXHAUST AIR AND THE OTHER INTERFACE WITH A HEAT EXCHANGER BY WHICH HEAT OF 35 DEGREES C IS DELIVERED TO A WATER CURRENT USED FOR FLOOR HEATING. PELLETS OF 170 MM2, CONSISTING OF TELLURIUM, BISMUTH AND ANTIMONY (TYPE P) AND TELLURIUM, SELENIUM (TYPE N), HAVE BEEN DEVELOPED AND WERE FOUND TO OPERATE SATISFACTORILY.
A THERMO-ELECTRIC HEAT PUMP OF 3.8 KW HEAT PRODUCTION HAS BEEN CONSTRUCTED WHERE AN ELECTRIC CURRENT THROUGH A CIRCUIT OF PELLETS INDUCES A TEMPERATURE DIFFERENCE BETWEEN THE HEAT EXTRACTION AND HEAT DISCHARGE SIDE. EXPERIMENTS SHOWED THAT THE COP VALUE (POWER TO HEAT) VARIED BETWEEN 1,5 AND 2,0. THOUGH THIS IS NOT VERY HIGH, THE HEAT PUMP HAS ADVANTAGES SUCH AS SILENT OPERATION, SIMPLE MAINTENANCE, AND A SIMPLE AND CONTINUOUS REGULATION OF THE HEAT OUTPUT BY VARYING THE CURRENT IN THE THERMO-ELEMENT. THE COST IS APPROXIMATELY THE SAME AS FOR ELECTRICAL HEAT PUMPS OF EQUAL SIZE.
THIS RESEARCH IS MADE UNDER TWO CONTRACTS REF. EE-A4-044 AND EE-A4-066 RESPECTIVELY 15 MONTHS AND 12 MONTHS.
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91460 Marcoussis
France