How does gas work in thermal oil heaters?

How does gas work in a thermal oil heater?

The main body of an air heat exchanger consists of a finned tube bundle, a pressure tube sheet, a pressure tube box, side panels, air inlet and outlet pipes, and air inlet and outlet reducers. The air inlet and outlet are connected to the air duct, and air is forced into the pipes by a draft fan. The air inlet should be located above the equipment, while the condensate outlet should be located near the bottom. The air inlet should be close to the condensate outlet, and the air outlet should be close to the air inlet. Although this arrangement does not achieve perfect countercurrent flow, it can improve the heat transfer temperature difference to a certain extent, achieving efficient heat transfer.

An air heat exchanger uses air as a heating source to heat the air. It primarily utilizes the air's latent heat of vaporization. During condensation, the air releases a large amount of heat, which is transferred through the tube walls to raise the air temperature to the desired level. During the condensation process, the air vapor condenses into condensate, which is discharged through a steam trap or collected and sent to a boiler for further heating and recycling.

Air should be introduced slowly, and the air and gas levels should be kept relatively stable during normal operation of the air heat exchanger. Especially during the initial introduction of air, it is important to prevent the temperature inside the air heat exchanger from rising rapidly. This rapid temperature increase can cause the air heat exchanger to expand rapidly, reducing its material's fracture toughness and even causing brittle fracture of the tubes. Because air heat exchangers are more complex than fresh air units in terms of air treatment technology, air conditioning units are often used in large public areas where fan coil units cannot be installed, while fresh air units are often used in smaller spaces where fan coil units can be installed.