Three innovative methods for extracting the latent heat of solidification of low-temperature cold water are proposed and designed, which belong to three invention patents respectively. They are:
1) invention patent: cold water solidification heat collection device application number: 20061009616.0; 2) Invention patent: method for preparing fluid ice by extracting latent heat of solidification based on elastic deformation of wall. ApplicationNo.: 2006 100096 18.X3) Invention patent: ApplicationNo.: 2006 10096 17.5 curing latent heat pump with low heat source supplying sensible heat for defrosting.
The main content of the first patent is to design a new and practical mechanical ice scraper. The core components of the device are the round tube and the spiral dragon in the tube, and the ice on the inner wall of the tube is scraped off by the rotation of the dragon. The main contents of design and calculation are as follows: a. The temperature difference of icing heat transfer, the amount of icing heat transfer, the required heat transfer area and the corresponding required pipe diameter, length and number; B. Energy consumption of ice scraping. In order to reduce the energy consumption of ice scraping, the optimal pipe diameter (proportional to the ice scraping torque) and the number of revolutions of the dragon are determined, where the pipe diameter is related to the required heat exchange area; C. Arrangement of multiple heat exchange tubes, arrangement of water and refrigerant spaces and isolation between them; D. the driving mode of the dragon rotating in each pipe and the linkage between them. The design calculation shows that the energy consumption of ice scraping is only lower than 1% of the obtained condensation heat, and the volume ratio of ice in the mixed fluid of ice and water can be kept within 2%, so as to ensure that no blockage occurs during the flow. The refrigerant outside the tube is ethylene glycol water, the temperature is controlled at -3℃ ~-5℃, and the evaporation temperature is about -7℃.
The main content of the second patent is to give a new idea and method of peeling ice from the wall. The heat exchange wall is elastically deformed slowly, intermittently or continuously. When the ice on the wall reaches a certain thickness, it will become brittle due to the deformation of the wall, and it can fall off the wall into the water under the action of water flow, air flow, gravity and buoyancy. The author has developed a variety of deformation and ice stripping systems, and an example of elastically deformable heat exchange surface is spiral spring tube. The design and calculation show that although the ice layer always has a certain thickness, its thermal conductivity and thermal resistance still account for only a small proportion of the total thermal resistance of heat transfer. Using mechanical force to make it deform slowly and elastically, the work consumed is very small, which does not constitute an additional energy consumption problem. Elastic deformation evaporative heat exchanger can be used not only for solidification latent heat pump, but also for ice storage and food refrigeration.
The main content of the third patent is to give a new method of making fluid ice. Spray heat source water into the airflow below zero to condense these water droplets into ice particles; The airflow circulates between the ice spraying chamber and the evaporator of the unit, and is constantly taken away by the evaporator to keep the temperature low. When the airflow containing ice particles leaves the spray icing chamber, most of the ice particles are separated into the return water of the heat source by inertial force and separation device. Residual ice particles and airflow with relative humidity close to 100% enter the evaporator and are cooled to keep the temperature low. It is conceivable that the metal surface of the evaporator will be severely frosted when such airflow is cooled. In order to solve the defrosting problem, the method of this patent is to set two evaporators to work alternately. When one evaporator cools the airflow, the supply of refrigerant in the other evaporator stops and is used for defrosting. This method makes full use of the inherent resources of the system, with low energy consumption and reliable operation.