Traditionally, refrigerant-grade ammonia has been used as a 99.98% pure substance, free of water and other impurities. It is readily available, inexpensive, and capable of absorbing LARGE amounts of heat when it evaporates. Lately, new blends incorporating ammonia have been shown to provide ADDITIONAL benefits in TERMS of LOWER discharge outlet temperature, a lower compression ratio, and a higher refrigeration capacity. Blends include the hydrocarbons propane (R290), octafluoropropane (R218), octafluorocyclobutane (RC318), or isobutane (R600a). The blend R723 - consisting of 60% ammonia and 40% dimethyl ether - promises further potential in high temperature heat pumps.

Traditionally, refrigerant-grade ammonia has been used as a 99.98% pure substance, free of water and other impurities. It is readily available, inexpensive, and capable of absorbing large amounts of heat when it evaporates. Lately, new blends incorporating ammonia have been shown to provide additional benefits in terms of lower discharge outlet temperature, a lower compression ratio, and a higher refrigeration capacity. Blends include the hydrocarbons propane (R290), octafluoropropane (R218), octafluorocyclobutane (RC318), or isobutane (R600a). The blend R723 - consisting of 60% ammonia and 40% dimethyl ether - promises further potential in high temperature heat pumps.