A New Concept of Refrigerant Control for Heat Pumps

The major problems encountered with conventional heat pump refrigerant cycles, how the new cycle works, and how it overcomes many of these problems are discussed. Operating limits of different types of systems are described and the reasons why these limits should not be exceeded are pointed out. Pressureanthalpy diagrams are explained, showing the difference between refrigerant cycles, and the problems with oil return from the evaporator are described. A performance comparison between different cycles is made and the wide application limits of the new cycle are illustrated.