The fully automatic heat exchange unit is a device that converts the heat energy of the primary network into heat energy of the secondary network to meet the heating needs of users, with the following main functions:
Heat exchange function
Through the heat exchanger, the heat of high-temperature hot water or steam in the primary network (such as a centralized heating network) is transferred to the cold water in the secondary network (the heating system at the user end), so that the water temperature in the secondary network is increased, achieving the purpose of heating for users.
Temperature regulation function
The supply water temperature of the secondary network can be automatically regulated according to user needs and actual working conditions. The water temperature of the secondary network is monitored in real time by a temperature sensor, and the signal is fed back to the control system. The control system automatically regulates the flow of the primary network or the operation parameters of the heat exchange equipment according to the set temperature value, so that the water temperature of the secondary network remains within the set range, meeting the requirements of different users for heating temperature in different seasons and different usage scenarios.
Pressure control function
Monitor and control the pressure of the primary and secondary networks. On the one hand, ensure the stability of the pressure in the primary network to guarantee the normal supply of heat from the heat source and the transmission of heat; on the other hand, control the pressure in the secondary network within a safe range to avoid pipeline rupture or equipment damage due to excessive pressure, and prevent the pressure from being too low to affect the heating effect. Through pressure sensors and corresponding pressure regulating devices, such as pressure reducing valves, make-up water pumps, etc., achieve automatic regulation and stable control of the network pressure.
Flow regulation function
It is able to automatically regulate the flow of the primary and secondary networks according to the change of heat load. When the heat demand of users increases, the system will automatically increase the flow of hot water in the primary network to improve the heat exchange, and at the same time, the flow of the secondary network will be regulated accordingly to ensure that the heat can be evenly and timely allocated to each user terminal. On the contrary, when the heat demand decreases, the flow will also be reduced accordingly. Flow regulation is realized through devices such as electric control valves, which has the characteristics of high regulation accuracy and fast response speed.
Automatic control function
The automated control system is adopted to monitor and automatically control the heat exchange unit. The operator only needs to set the relevant parameters, such as temperature, pressure, flow rate, etc., on the control cabinet, and the system can automatically adjust the operation state of each device according to the actual operation conditions, without the need for frequent manual intervention. In addition, the automatic control system also has the fault diagnosis and alarm function, which can monitor the operation status of the equipment in real time. Once a fault is detected, it immediately sends out an alarm signal and takes corresponding protective measures, such as automatic shutdown, power cut, etc., to ensure the safe operation of the equipment and the system.
Water treatment function
To prevent scaling, corrosion and other issues from causing damage to heat exchange equipment and pipelines, fully automatic heat exchange units are usually equipped with water treatment devices. Common water treatment functions include the preparation of softened water, deoxygenation, dosing, etc. The softened water preparation device removes calcium, magnesium and other ions from the water through ion exchange and other methods, reducing the hardness of the water and preventing the formation of scale; the deoxygenation device removes dissolved oxygen from the water, reducing the corrosion of oxygen on pipelines and equipment; the dosing device adds appropriate amounts of corrosion inhibitors, scale inhibitors and other chemical agents to the water according to the water quality conditions, further protecting the equipment and pipelines and extending their service life.