Customized Heat Exchanger for Water Dispenser

Customized Heat Exchanger for Water Dispenser

Tubes:

Material: Usually copper tubes are used. Copper has excellent thermal conductivity (1.8 times that of aluminum and 8 times that of steel), is easy to bend and process, and is corrosion resistant.

Internal flow: The refrigerant of the refrigeration system (e.g. R134a) flows and evaporates inside the copper tubes, absorbing a large amount of heat.

Fin (Fins):

Material: Aluminum foil is usually used. Aluminum has good thermal conductivity, light weight, low cost, and is easy to process into complex shapes.

Role: The fins are tightly set on the copper tubes, which greatly increases the external area of the heat exchanger, thus strengthening the heat exchange with the external medium.

External flow: The cold water from the water dispenser fills the tank outside the heat exchanger and comes into direct contact with the fins and the tube walls.

Principle of operation (refrigeration as an example):

The refrigerant, driven by the compressor, enters the tube-fin heat exchanger (which at this point acts as an evaporator) in a low-temperature, low-pressure liquid state. The water filled in the tank is at a higher temperature, and the heat is transferred to the refrigerant inside the tube through the aluminum fins and the copper tube wall. The refrigerant absorbs heat and evaporates, becoming a low-temperature, low-pressure gaseous state, and at the same time, the heat of the water will be taken away, so that the water temperature drops rapidly to the set temperature (usually 5-15 ℃).