9.16 Daily Question – Commonly Used in the Pharmaceutical and Chemical Industries – High and Low Temperature Cycling Unit – Prize for Every Correct Answer (Pharmaceutical Engineering Edition)
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This post was last edited by sumanl on 2017-9-19 at 12:19. (Answers must be submitted within 24 hours.) Open-ended question: The diagram shows the workflow of a high and low temperature cycling unit. Please describe its working process or principle based on your own understanding.
An electric heating system consists of an expansion tank, a circulation pump (including oil supply and return circuits), and an electric heater; the latter is used to heat the jacket of the reactor in order to meet the temperature rise requirements. To meet the cooling needs of the reactor, a refrigeration unit cools the oil within the circulation system through a heat exchanger~~
This post was last edited by *xlx on 2017-9-16 13:31. The high and low temperature cycling device is a combination of a low-temperature coolant circulation pump and a high-temperature oil bath. 1. The high and low temperature cycling unit uses original fully enclosed compressors from internationally renowned manufacturers, featuring advanced performance and reliable quality. 2. The relays, protectors, capacitors, and other components used in the refrigeration unit are all high-quality original imported items, ensuring reliable performance and a long service life. 3. The heating chamber and fluid delivery pipelines are made of Cr316 pressure-resistant stainless steel, which is resistant to high temperatures and corrosion, thereby enhancing the performance of the entire device. 4. High-temperature control is achieved through an air switch start button, along with a solid-state relay that enables efficient and intelligent temperature regulation; there is no open flame during startup or operation, ensuring safety and reliability. It also features various protection devices such as delay, overheat, overvoltage, and overcurrent protection. 5. Pt100 thermistors are used for temperature measurement, with a digital intelligent temperature controller for control; it offers high precision, simple operation, and clear display.
It is widely applicable in fields such as colleges and universities, environmental protection, biochemistry, medicine, chemical engineering, and scientific research. The product features a rational structure, simple operation, and good stability, making it an ideal device for experimental pilot testing. High and low temperature circulation tanks, high and low temperature oil bath circulation tanks, and high and low temperature circulation pumps belong to high and low temperature oil bath external circulation devices. Its working principle is as follows: By programming the intelligent temperature controller of the device, and with the temperature sensing system providing feedback on the temperature of the container, the controller regulates the compressor to carry out cooling, thereby reducing the temperature of the medium in the cold tank. The heater is used to raise the temperature of the medium in the chamber, and through rapid heating and cooling processes, the temperature of the medium in the tank is adjusted to meet the user’s requirements. Finally, a leak-proof shielded circulation pump is used to transfer the medium to external devices such as reaction vessels; once the reflux is established and the valve is opened, heat circulation and exchange can be achieved. When it is necessary to rapidly increase or decrease the temperature of devices such as glass reactors, reactors, rotary evaporators, and extraction equipment used in high and low temperature cycling systems, this equipment can quickly bring them to the desired temperature. This device can quickly switch between heating and cooling modes, using the same medium (heat transfer oil), which completely eliminates the drawback of previously requiring two separate devices for heating and cooling. The entire liquid circulation in the high and low temperature cycling device is enclosed; it features an expansion vessel. The expansion vessel and the liquid circulation system are insulated from each other and do not participate in the liquid circulation process – they are only mechanically connected. Regardless of whether the temperature of the liquid circulation is high or low, the temperature of the fluid inside the expansion vessel remains below 60 degrees. The entire liquid circulation system is also a sealed system, which prevents water vapor absorption at low temperatures and oil mist formation at high temperatures; the whole circulation system is sealed with no leaks.
It is widely applicable in fields such as colleges and universities, environmental protection, biochemistry, medicine, chemical engineering, and scientific research. The product features a rational structure, simple operation, and good stability, making it an ideal device for experimental pilot testing. High and low temperature circulation tanks, high and low temperature oil bath circulation tanks, and high and low temperature circulation pumps belong to high and low temperature oil bath external circulation devices. Its working principle is as follows: By programming the intelligent temperature controller of the device, and with the temperature sensing system providing feedback on the temperature of the container, the controller regulates the compressor to carry out cooling, thereby reducing the temperature of the medium in the cold tank. The heater is used to raise the temperature of the medium in the chamber, and through rapid heating and cooling processes, the temperature of the medium in the tank is adjusted to meet the user’s requirements. Finally, a leak-proof shielded circulation pump is used to transfer the medium to external devices such as reaction vessels; once the reflux is established and the valve is opened, heat circulation and exchange can be achieved. When it is necessary to rapidly increase or decrease the temperature of devices such as glass reactors, reactors, rotary evaporators, and extraction equipment used in high and low temperature cycling systems, this equipment can quickly bring them to the desired temperature. This device can quickly switch between heating and cooling modes, using the same medium (heat transfer oil), which completely eliminates the drawback of previously requiring two separate devices for heating and cooling. The entire liquid circulation in the high and low temperature cycling device is enclosed; it features an expansion vessel. The expansion vessel and the liquid circulation system are insulated from each other and do not participate in the liquid circulation process – they are only mechanically connected. Regardless of whether the temperature of the liquid circulation is high or low, the temperature of the fluid inside the expansion vessel remains below 60 degrees. The entire liquid circulation system is also a sealed system, which prevents water vapor absorption at low temperatures and oil mist formation at high temperatures; the whole circulation system is sealed with no leaks.
A high and low temperature cycling device is a combination of a low-temperature coolant circulation pump and a high-temperature oil bath. 1. The high and low temperature cycling unit uses original fully enclosed compressors from internationally renowned manufacturers, featuring advanced performance and reliable quality. 2. The relays, protectors, capacitors, and other components used in the refrigeration unit are all high-quality original imported items, ensuring reliable performance and a long service life. 3. The heating chamber and fluid delivery pipelines are made of Cr316 pressure-resistant stainless steel, which is resistant to high temperatures and corrosion, thereby enhancing the performance of the entire device. 4. High-temperature control is achieved through an air switch start button, along with a solid-state relay that enables efficient and intelligent temperature regulation; there is no open flame during startup or operation, ensuring safety and reliability. It also features various protection devices such as delay, overheat, overvoltage, and overcurrent protection. 5. Temperature measurement is carried out using a Pt100 thermistor, with digital intelligent temperature controllers for control; it features high precision, simple operation, and clear display
During high-temperature cycling, turn off the refrigeration unit and raise the temperature to the desired level using electric heating； During low-temperature cycling, turn off the electric heater and activate the refrigeration unit to lower the oil temperature through the heat exchanger. This is a superficial way of putting it. . Looking forward to a detailed answer from an expert