Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
Thermosyphon applied as thermal reservoir to chemisorption chillers
Submission Author:
Marcos Vinício Oro , SC
Co-Authors:
Marcos Vinício Oro, Rogério Gomes de Oliveira, Edson Bazzo
Presenter: Marcos Vinício Oro
doi://10.26678/ABCM.COBEM2017.COB17-1980
Abstract
Waste heat from a device or a process can be used to produce cooling power when integrated with sorption refrigeration systems. Hence, we analyzed through numeric simulation the thermal energy integration between a chemisorption chiller and a generic waste heat source by a two-phase closed thermosyphon, which acted as thermal reservoir to reduce temperature drop in the chiller heating fluid and also heat fluctuations delivered by the waste heat device or process. The chiller mathematical model assumed that ammonia was the refrigerant and NaBr impregnated in expanded graphite was the adsorbent, and it was validated by experimental results. Water was considered as working fluid for the thermosyphon. Three levels in the flow rate of the heat transfer fluid (water at 70 °C) between the waste heat source and the thermosyphon were simulated: 5, 10 and 20 L/min. The system reached cooling powers of about 300 W and coefficient of performance of about 0.30. A power interruption of 5 min from the waste heat was also simulated, wherein the thermosyphon was able to provide the required heat for heating the chiller during the desorption stage, keeping in operation the system.
Keywords
heat recovery, Refrigeration, Sorption, Thermosyphon, Waste heat
