Study Of The Cold Energy Utilization Of The Adsorption Refrigeration System Powered By Ship’s Waste Steam

In recent years, solid adsorption refrigeration has been paid more and more attention.Application of adsorption refrigeration in the ship has more tremendous development potentialfrom the aspects of energy-saving and environmental protection. Adsorption refrigeration hasbeen applied on the fishing boats for ice making. However, the application on oceangoing shipshas not yet reached the practical stage. In order to promote application of the solid adsorptionrefrigeration technology on oceangoing ships, the verification work has been carried out in thisthesis as follows:Optimization of the scheme for designing the cold energy utilization of the adsorptionrefrigeration system powered by ship’s waste steam was carried out. According to thelaboratory’s specific construction data, the heat load of the air conditioning and the cold storageunder typical condition were calculated. Based on currently performance of anammonia-composite adsorption refrigeration system, the efficiency of exergy of the system wasanalyzed in the direct and indirect cooling mode to be adopted for air conditioning. The glycolsolution was selected as coolant and the double-layer louver ventilation and the single shutterreturn was applied due to much even distribution of temperature within air conditioning room.Construction of the cooling capacity of ammonia-composite adsorption refrigeration systempowered by marine waste. According to the determined value of the heat load and its variationtendency, the heat from steam was used to power adsorbent bed, running water was introduced asthe cooling water, the composite adsorbent-ammonia was selected as working pair, the unit tubeadsorbent bed was employed to construct the adsorbers for a cold energy utilization systempowered by ship’s waste steam. Moreover, the automatic control of pneumatic valves wasachieved by PLC programmable controller.Verification tests were carried out for the performance analysis of the adsorptionrefrigeration utilization system. The adaptability of system’s cooling capacity to the externalenvironmental temperature, the flow rate and the temperature of cooling water as well as theflow rate of the steam was firstly evaluated by comparing the heat load with the cooling capacity.The temperature of the cooling water out-letting from the adsorbent bed was then also recordedfor studying the interaction mechanism between ammonia molecules and composite adsorbent.Results show that selection of the temperature of cooling water should be matched in terms of heat balance resulted from the adsorption and desorption of the adsorbate; the outlet temperatureof the cooling water changes rapidly during the changeover of the adsorbent bed from adsorptionto desorption. The variation curve of the temperature of the cold storage room decreases quicklyin initial stage and becomes even while the temperature drop down to near-20℃, which revealsthe fact that the mass transfer of the ammonia molecules is difficult due to a slower dynamicunder a lower pressure. Conclusions are drawn that the verification of the interaction mechanismbetween ammonia molecules and the adsorbent is crucial to the further development of thesystem.