Theoretical Studies on Start-up Characteristics of a High-pressure Generator for LiBr Absorption Chiller

摘要

Dynamic models and simulation of a gas-fired bouble-effect lithium bromide absorption chiller and heat transfer character of high pressure generator are presented. The dynamic mathematical models of each component, as well as the whole system of the absorption chiller, have been established. Researches are done to study on the startup characteristics of a 106kW chiller through utilizing the dynamic model of the whole system. It can be discovered that the initial mass of LiBr solution in the high pressure generator has an apparent effect on the performance of the high pressure generator and the whole unit in the startup. When the lithium bromide solution mass is reduced 15% than the designed value, the delay time of the high pressure generator is shortened as well as the first stable time in the startup and the crystallization will not occur, which surely will be beneficial to the performance of the unit. The researches can provide with important reference for the design of optimization as well as technical support for on-line control of absorption chiller.