The compressor of constant temperature and humidity incubator is the heart of refrigeration system. It inhales low temperature and low pressure gas and becomes high temperature and high pressure gas. It releases heat through condensation into liquid and takes heat away through fan. Therefore, under the incubator of constant temperature and humidity incubator is the cause of hot air. Then it throttles to low pressure liquid, and then becomes low temperature through evaporator. The low pressure gas finally returns to the compressor; the refrigerant absorbs heat in the evaporator to complete the gasification process and absorbs heat, so as to achieve the purpose of refrigeration and complete the cooling process of the incubator with constant temperature and humidity.
Under the condition of ultra-low temperature and high temperature of constant temperature and humidity equipment constant temperature box, because the added vapor and gas are not sufficiently mixed or touch with the wall of the box, some cold suspicion appears, which not only reduces the amount of added vapor, but also releases heat to raise the temperature of humid air in the box; with the above-mentioned epsilon'> epsilon, it is not isothermal heating. During the wet process, the temperature in the box will rise. Steam humidification, such as electrothermal humidification, separated open and closed. Open-type response is slow, often lagging phenomenon, so the humidity fluctuation is large, but the structure is simple and reliable. The working pressure of closed steam exceeds atmospheric pressure, which is between 0.1 MPa and 0.3 MPa. There is no lagging behind, but it needs to be equipped with pressure regulating valves, relays, drainage pipes and so on. The structure is tedious and most of them are used in large and medium-sized artificial climate chambers. Open multi-purpose for medium and small constant temperature and humidity incubator. In the past, the constant temperature and humidity incubator manufactured by Sida Experimental Instrument Factory used open electric heating steam humidification.
When the gas in the thermostat of constant temperature and humidity equipment touches the river surface immediately, when it approaches the river surface, a saturated gas boundary layer corresponding to the temperature of the river surface is produced as a result of irregular exercise of oxygen molecules. The concentration value of the molecular structure of water vapor or the working pressure of water vapor are in the saturated state of the boundary layer. Temperature of gaseous state. When air passes through open water surface, it exchanges heat and moisture with water surface. According to the water temperature, there may be only sensible heat exchange, sensible heat exchange, wet heat exchange and latent heat exchange. Sensible heat exchange is the difference of temperature between air and water, which is heat exchanged by conduction, convection and radiation. Latent heat exchange is the result of vaporization latent heat absorbed by vapor evaporation in air. The total heat exchange is the algebraic sum of sensible heat exchange and latent heat exchange.
If the temperature of the boundary layer is higher than that of the gas above it, the heat conduction from the boundary layer to the gas is carried out; on the contrary, the heat conduction from the gas to the boundary layer is carried out. If the molecular structure concentration of water vapor in the boundary layer exceeds the molecular structure concentration of water vapor in the gas above, the number of molecular structure of water vapor in the gas will increase; otherwise, it will decrease. The former is called "evaporation" and the latter is called "condensation". In the evaporation process, the reduced water vapor molecules in the boundary layer are supplemented by the water molecules leaping from the water surface; in the condensation process, excessive water vapor molecules in the boundary layer will return to the water surface. Thus, the sensible heat exchange between air and water depends on the temperature difference between the boundary layer and the air above it, while the moisture exchange and the latent heat exchange caused by it depend on the concentration difference or partial pressure difference of water vapor molecules between them. The wet principle is based on the electric heater water, which causes vapor in the stainless steel water tank. The steam enters the constant temperature and humidity equipment thermostat according to the spray tube, and carries out the humidifier for the gas in the box. The steam from the steam boiler which is higher than atmospheric pressure is decompressed and injected into the incubator of constant temperature and humidity for humidification.
The cyclone in the thermostat is exchanged between cold and humidity according to the surface layer of the shallow water plate in the thermostat, which corresponds to the saturated gas boundary area of the river surface temperature. When the molecule structure concentration of vapor in the boundary residential area exceeds the molecule structure concentration of water vapor passing through the cyclone, it is humidifier, on the contrary, it is dehumidifier.