Dynamic Performance Analysis for an Absorption Chiller under Different Working Conditions

Abstract

Featured Application: The dynamic performance of the absorption chiller (AC) under different working conditions in this work is significant for the operation of the whole system, of which the stabilization can be affected by the AC transient process.Abstract: Due to the merits of energy saving and environmental protection, the absorption chiller (AC) has attracted a lot of attention, and previous studies only concentrated on the dynamic response of the AC under a single working condition. However, the working conditions are usually variable, and the dynamic performance under different working conditions is beneficial for the adjustment of AC and the control of the whole system, of which the stabilization can be affected by the AC transient process. Therefore, the steady and dynamic models of a single-effect H 2 O-LiBr absorption chiller are built up, the thermal inertia and fluid storage are also taken into consideration. And the dynamic performance analyses of the AC are completed under different external parameters. Furthermore, a whole system using AC in a process plant is analyzed. As a conclusion, the time required to reach a new steady-state (relaxation time) increases when the step change of the generator inlet temperature becomes large, the cooling water inlet temperature rises, or the evaporator inlet temperature decreases. In addition, the control strategy considering the AC dynamic performance is favorable to the operation of the whole system.

Solar Cooling Technologies

“…The thermal compressor consists of absorber and generator. Figure 4 shows the general schematic of a single effect absorption cycle [18]. The absorption chiller cycle consists of the following steps:…”

“…Schematic of the absorption chilling cycle[18].Energy Conversion -Current Technologies and Future Trends…”

Special Issue on Sciences in Heat Pump and Refrigeration

“…Solar cooling with a combination with absorption refrigeration was investigated by Galindo Luna et al [14] and Li et al [15]. In addition, Wang et al [16] studied the dynamic behavior of an absorption chiller under various operating conditions. In the field of the adsorption heat pump, Maeda et al [17] provided a critical review on an adsorption heat pump for automobile applications.…”

Comparison the start-up time of the key parameters of aqua-ammonia and water–lithium bromide absorption chiller (AC) under different heat exchanger configurations

“…Many researchers conducted dynamic model of the absorption cycle by using the mass and energy conservation and momentum equations [7][8][9][10][11]. Investigation the behavior of the absorption cycle in dynamic mode by applying the step change in the cycle [5,6,8,12,13] and during start-up [7,14,15] have been already carried out. Dynamic simulation of ammonia-water heat pump [8,[16][17][18][19] was accomplished to predict the transient performance and design characteristics as well.…”