In a lithium bromide absorption system producing chilled water, what is the lowest possible temperature leaving the evaporator?

In a lithium bromide absorption refrigeration system, the temperature leaving the evaporator is directly related to the refrigerant properties and the operational principles of the system. The evaporator in such a system functions by absorbing heat from the chilled water, causing the refrigerant (lithium bromide and water solution) to evaporate and cool the water.

The lowest achievable temperature at the evaporator outlet is typically limited by the properties of the solution and the need to avoid freezing conditions. While temperatures from 31°F to 38°F are conceivable within such systems, a discharge temperature of 38°F is realistic and often considered the practical limit to ensure effective operation without risking freezing the water in the evaporator or causing any operational issues.

Temperatures lower than this may introduce risks in system performance, as lower temperatures can lead to crystallization problems with the lithium bromide solution and negatively impact the efficiency and reliability of the absorption cycle. Thus, 38°F represents a safe and operationally effective temperature leaving the evaporator in this context.