Experimental Performance of a Membrane Desorber Operating under Simulated Warm Weather Condensation Temperatures

Membranes

Rosenberg J. Romero¹  Sandra Daniela Nanco-Mejía²  Jonathan Ibarra-Bahena³  Ulises Dehesa-Carrasco³  Eduardo Venegas-Reyes³  Wilfrido Rivera⁴ 

[1] Centro de Ingeniería y Ciencias Aplicadas, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, Cuernavaca 62209, Morelos, Mexico;Facultad de Ciencias Químicas e Ingeniería, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, Cuernavaca 62209, Morelos, Mexico;Instituto Mexicano de Tecnología del Agua, Paseo Cuauhnáhuac 8532, Colonia Progreso, Jiutepec 62550, Morelos, Mexico;Instituto de Energías Renovables, Universidad Nacional Autónoma de México, Privada Xochicalco S/N, Col. Centro, Temixco 62580, Morelos, Mexico;

关键词: desorption process;    air gap membrane distillation;    water/LiBr mixture;    absorption cooling systems;   

DOI  :  10.3390/membranes11070474

来源: DOAJ

【 摘 要 】

In absorption systems using the aqueous lithium bromide mixture, the Coefficient of Performance is affected by the desorber. The main function of this component is to separate the refrigerant fluid from the working mixture. In conventional boiling desorbers, constant heat flux and vacuum pressure conditions are necessary to carry out the desorption process, and usually, the absorbers are heavy and bulky; thus, they are not suitable in compact systems. In this study, a membrane desorber was evaluated, operating at atmospheric pressure conditions with a water/lithium bromide solution with a concentration of 49.6% w/w. The effects of the solution temperature, solution mass flow, and condensation temperature on the desorption rate were analyzed. The maximum desorption rate value was 6.1 kg/m²h with the following operation conditions: the solution temperature at 95.2 °C, the solution mass flow at 4.00 × 10⁻² kg/s, and the cooling water temperature at 30.1 °C. On the other hand, the minimum value was 1.1 kg/m²h with the solution temperature at 80.2 °C, the solution mass flow at 2.50 × 10⁻² kg/s, and the cooling water temperature at 45.1 °C. The thermal energy efficiency, defined as the ratio between the thermal energy used to evaporate the refrigerant fluid with respect to the total thermal energy entering the membrane desorber, varied from 0.08 to 0.30. According to the results, a high solution mass flow, a high solution temperature, and a low condensation temperature lead to an increase in the desorption rate; however, a low solution mass flow enhanced the thermal energy efficiency. The proposed membrane desorber could replace a conventional boiling desorber, especially in absorption cooling systems that operate at high condensation temperatures as in warm weather regions.

【 授权许可】

Unknown