Definition
Refrigeration thermostatic tank is a laboratory equipment that establishes and maintains a stable and uniform temperature environment in the tank through the combination of mechanical cooling and heating system. Its core function is to provide a controlled temperature field near a set temperature point, providing precise temperature conditions for processes such as sensor calibration, material testing, and chemical reactions.
How it works:
The operation of the refrigeration thermostat is based on the principle of thermodynamic equilibrium and fluid circulation. The system typically consists of a tank, circulation pump, refrigeration unit, heater, temperature sensor, and controller. The controller receives the feedback signal from the temperature sensor, compares it with the set value, and adjusts the power of the refrigeration compressor or the output of the heating element to realize the dynamic increase or decrease of the medium energy in the tank. At the same time, the circulation pump promotes the flow of medium in the tank and in the outer circulation pipeline, ensuring a high degree of uniformity of the temperature in the working area. The temperature control process can be abstracted into closed-loop feedback regulation.
Measurement method
The evaluation of the performance of the refrigeration chamber is mainly based on relevant national and international standards, focusing on its temperature stability, uniformity and fluctuation. For measurement, multiple calibrated, high-precision temperature probes are placed in the tank working area. Stability is assessed by recording changes in center point temperature over a set period of time; The uniformity is determined by calculating the maximum temperature difference between the measurement points at a certain moment. Measurements should be made after the equipment has reached thermal equilibrium, and the effects of ambient temperature and humidity should be taken into account. Its basic uniformity calculation can be expressed as: ΔT = Tmax - Tmin, where ΔT is the temperature uniformity, Tmaxand TminThe maximum and minimum values of the temperature at the same time are respectively.
Influencing factors
The performance of refrigeration thermostatic tanks is affected by various factors. Environmental conditions such as high ambient temperature or poor ventilation can increase the heat load and affect the refrigeration efficiency and temperature control accuracy. The type, purity and liquid level height of the medium in the tank directly affect the heat conduction efficiency and temperature uniformity. The load of the equipment, such as the volume, material and heat capacity of the object to be tested, will disturb the thermal balance in the tank. In addition, the design of the circulation system, the efficiency of the insulation layer, and the accuracy of the control algorithm are all key internal factors that determine the quality of the final temperature field.
Applications:
Refrigeration thermostatic tanks are widely used in industrial testing and scientific research scenarios that require precise temperature fields. In the field of metrology, it is used to calibrate various temperature sensors and temperature gauges. In materials science, it is used to evaluate the physical properties of materials at different temperatures. In the chemical industry, it provides a constant temperature environment for the reaction process. In the field of electronics and electrical products, it is used for temperature characteristics testing of components and battery products. In addition, in laboratories related to food inspection and environmental monitoring, it also provides a stable temperature source for sample preparation or equipment operation.
Equipment selection
When selecting, it is necessary to comprehensively consider technical parameters and actual needs. The first thing is to define the temperature range to ensure that the minimum cooling and maximum heating temperatures of the equipment meet the application limits. Secondly, pay attention to the volume and opening size of the tank body to adapt to the size of the tested item. Temperature field performance indicators, such as uniformity and stability, should be determined according to the accuracy requirements of the standards or experiments performed. It is also necessary to consider the compatibility of the medium to avoid adverse reactions between the medium and the tank material or the test object. Other factors include the temperature rise and fall rate, the external circulation interface requirements, the user-friendly design of the control interface, and the energy consumption and maintenance ease of the equipment. It is recommended to refer to the current and effective national or international technical specifications for comparison and evaluation.