Patent ID: 6432319
Filing Date: 2002-08-13
Classification: C09K

Abstract:
A method for improving the efficiency of an absorption heat pump comprising the step of:circulating an aqueous circulation fluid in the absorption heat pump, the aqueous circulation fluid including an absorbent salt and a crystallization-inhibiting additive in the range of about 200 to 5000 molar ppm, selected from the group consisting of 5-amino-2,4,6-trioxo-1,3-perhydrodizine-N,N-diacetic acid (uramil N,N-diacetic acid), 1-hydroxyethlidene-1,1-diphosphonic acid (HEDP), diethylene triamine penta (methylene phosphonic acid) (DTPMP), amino tri (methylene phosphonic acid) (ATMP), and combinations including one or more of the foregoing, the circulation fluid having a high cycle temperature and a low cycle temperature, wherein the low cycle temperature is not higher than âˆ’5Â° C. at an absorbent salt concentration of about 30-85% by weight.