Diffusion-absorption type refrigerator which is called absorption type refrigerator for short hereinafter is one eco-friendly high-tech product.
There is no freon involved to destroy ozonosphere and no compressor or any mechanism driving accessory to make noise. So, it’s praised by the Environment Protection Organization as double green environment friendly product.
The absorption type refrigerator consists of diffusion-absorption refrigeration core, box and relative accessories. The pivotal part is the refrigeration core which is composed of curly shaped steel tubes. Those tubes are assembled and sealed together to a completely closed system. Ammonia, helium and water are poured in proportion into that system. Among them, ammonia is used as refrigerant, water as absorbent and helium as the diffusion agent. The core utilized heat resource as motivity to promote the circulation of refrigerant for the purpose of refrigeration. According to heat-siphon theory, the refrigeration system works continuously without any mechanical transmission.
Working principle of refrigeration core
The refrigeration core is mainly composed of generator, condenser and evaporator. Under the environment of low press in the evaporator, liquid ammonia evaporates into helium and mixes with gas helium together. In the absorber, gas ammonia is released from the mixture and is absorbed by water to be strong ammonia solution. Then, in the heater it is heated and the ammonia evaporates from the solution. Passing through the condenser, steam ammonia is cooled down to ammonia.After that, ammonia water reenters the evaporator. As a result of physical changes, endothermic-exothermic reaction is brought into being time and time again.
NH4OH→NH3+H20
NH3+H2O→NH4OH
Not any mechanical transmission is involved in the whole circulation system, so there is not any noise. Just under the condition of heat energy, ammonia will steam from ammonia water. So, many kinds of energies could be used in the circulation system, which is out of the ability of compressor.
