Research On The Generator And Roots Pump In Small Solar Absorption Refrigeration System

Solar energy as a clean and inexhaustible energy has attracted more and more attention in the world. In the air-conditioning areas, compared with traditional compression refrigeration, Solar-driven lithium bromide absorption refrigeration system develops fast, because it does not damage the ozone layer and does not produce greenhouse gases. With the popularization of domestic air-conditioning, lithium bromide air-conditioning plant develops towards miniaturization.In the absorption air conditioning system, the occurrence of generator directly impact on the operation of the system. The heat transfer of small generators is not good because of the restrictions of the equipment size and flow state. Thus we choose plain tube,shape T fin tub and porous surface tube to use in the submerged generator. By the research, we can see the superiority of porous surface tube. At the same time, studied on the heat transfer characteristics and operating conditions on porous surface tube in ray-type generator, and compared with submerged generator, finally choose the submerged generator with porous surface tube for improving heat transfer inside the generator and reducing the size of the equipment.In the solar single-effect lithium bromide absorption air-conditioni system, because of the limited heat source temperature, the cooling load and coefficient of performance is very low, so we utilize pressurized circulating to improve steam pressure in the export of generator. We choose a roots pump as the supercharger. In this paper, we designed a small roots pump with the line of arc, and simulate pressure distribution and velocity distribution in the pump cavity in order to improve the rotor profile.