Introduction to Ducted Inverter Heat Pump

Ducted inverter heat pump, also known as tube-and-tube heat exchanger, is a wall-mounted heat exchanger that is closed on the wall of the tube bundle in the casing as a heat transfer surface. The heat exchanger has a simple structure and reliable operation, can be manufactured by various structural materials (mainly metal materials), can be used under high temperature and high pressure, and is the most widely used type at present.

Ducted inverter heat pump is composed of a casing, a heat transfer tube bundle, a tube sheet, a baffle (baffle), and a pipe box. The housing is mostly cylindrical, and a tube bundle is installed inside, and both ends of the tube bundle are fixed on the tube sheet. Among the two types of hot and cold fluids that perform heat exchange, one flows inside the tube and is called a tube-flow fluid; the other flows outside the tube and is called a shell-side fluid. In order to increase the heat transfer coefficient of the fluid outside the tube, a number of baffles are usually installed in the housing.  The baffle increases the speed of the shell-side fluid, forcing the fluid to pass laterally through the tube bundle multiple times over a specified path, thus enhancing fluid turbulence. Ducted inverter heat pump can be arranged on the tube sheets in equilateral triangles or squares. The equilateral triangles are arranged in a compact manner, the fluid outside the tube is highly turbulent, and the heat transfer coefficient is large; the square arrangement is convenient for cleaning outside the tube, and is suitable for fluids that are easy to scale.
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