What is the principle difference between lithium bromide and ammonia water absorption cycles?

The principle difference between lithium bromide and ammonia water absorption cycles lies in the pressure range of the cycle. Lithium bromide absorption systems operate primarily at lower pressures, which makes them suitable for applications where lower temperature refrigeration is sufficient. They are especially effective in systems where waste heat or low-grade heat is available, as they require lower operating pressures to facilitate the absorption process.

On the other hand, ammonia-water absorption systems operate at higher pressures, allowing them to be more efficient in applications that demand higher cooling capacities or temperature differences. This higher pressure enables ammonia to have a stronger thermodynamic performance in producing refrigeration.

Understanding this distinction is crucial for refrigeration engineers, as it influences the selection of the appropriate cycle for specific applications, based on the required cooling load and the available energy sources. The pressure range not only affects the efficiency of the absorption cycle but also impacts the material selection and design of system components.