Different temperature control sensors
Household refrigerators generally have only one temperature sensor, and the temperature of the refrigerator varies greatly when the compressor starts and when it stops. Household refrigerators only need to ensure that food is fresh and does not deteriorate, so the temperature fluctuates greatly.
The medical refrigerator has 2 to 3 temperature sensors. The temperature sensor, electronic temperature controller and microcomputer controller are used to ensure the accuracy of the temperature in the cabinet. Even if the door is opened frequently, the temperature control system can quickly adjust to keep the temperature in the cabinet stable.
Different compressor types
In order to save electricity, household refrigerators use low-pressure compressors. The refrigeration evaporates instantaneously and the temperature drops a lot. Therefore, it is easy to cause freezing and overcooling of the items in the refrigerator.
In order to ensure that the temperature in the refrigerator space drops steadily, the medical refrigerator uses a medium double pressure compressor. The low-temperature system is also equipped with a gas heat exchanger, which can make the low-pressure gas from the evaporator enter the high-pressure gas before the condensing evaporator. Carry out heat exchange, which can reduce the heat load of the condensing evaporator and make full use of the heat. It also ensures the stability of the refrigerator.
Different cooling methods
In order to save energy and save costs, domestic refrigerators often use direct cooling and auxiliary air cooling. High-end domestic refrigerators will use air cooling. The evaporator of direct cooling refrigerators is close to the inner wall of the refrigerator, making the temperature of the inner wall of the refrigerator very low (far below the operating temperature). Heat is transferred inward by natural convection, and the temperature in the box varies greatly. When medicines or vaccines are stacked too much close to the inner wall, cold damage will occur. This type of refrigerator is cold on the bottom and hot on the top.
In order to make the temperature of each part of the refrigerator consistent, the medical refrigerator has a comprehensive layout of the evaporator or the selection of a suitable fan to circulate the temperature. This type of refrigerators are all air-cooled, and air-cooling has strict requirements on the temperature uniformity and volatility of the refrigerator. There is a dedicated air duct in the air-cooled refrigerator box to isolate the cold source, which can ensure a uniform and constant temperature, and at the same time ensure that biological products such as medicines and vaccines are not damaged by freezing. The refrigeration system of the ultra-low temperature refrigerator basically adopts the working principle of cascade or refrigeration.
Different types of alarms
Household refrigerators generally have no alarm function, and occasionally they only have an over-temperature alarm function.
The medical refrigerator has the functions of over-temperature alarm and fault alarm, and some products also have the function of storing electricity, which increases the safety of storing biological products. The medical refrigerator has multiple alarm devices for the door is not closed, the condenser is dirty, the condenser is often high temperature, the sensor is faulty, and the power is off. The alarm mode can also be used to remind users to observe by sound buzzer and light flashing.
Temperature display is different
The temperature display resolution of household refrigerators is generally 10°C, which can only be displayed briefly.
Medical refrigerators have electronic digital temperature display and temperature adjustment functions. The digital temperature display can directly express the temperature in the cabinet, which is convenient for monitoring and reading the temperature in the cabinet. The temperature adjustment is equipped with a high and low temperature alarm device. In addition to displaying the real-time temperature in the cabinet, the medical refrigerator can also display the minimum and maximum of the refrigerator. average temperature. The resolution of the temperature display is 0.1°C.
Different insulation thickness
The thickness of the insulation layer of household refrigerators is generally 3.5～4mm foamed polyurethane.
The thickness of the insulation layer of the medical refrigerator is 45-60mm or even thicker.
Remote monitoring
Household refrigerators currently have no remote monitoring function.
The medical refrigerator can be connected to a remote alarm. By setting the upper/lower limit of the temperature of the medical refrigerator, when the temperature exceeds the range, the abnormal device can be notified by email, mobile phone text message, and the status of the device can be notified according to the setting regardless of whether there is an abnormality. The machine can be set remotely even if it is no longer next to the machine.
