The main materials used in air source heat pumps vary depending on their core components and functional requirements. Below are the main materials used for key components:
Compressor: Typically uses a high-strength cast iron or aluminum alloy casing. Internal moving parts often use wear-resistant alloy steel to withstand high pressure and high-speed operation.
Evaporator (Finned Heat Exchanger):
Pipes: Commonly uses low-finned internally threaded copper tubes to enhance heat exchange efficiency.
Fin Material: Mostly hydrophilic aluminum foil or smooth aluminum foil. Some high-end products use titanium-plated aluminum foil to improve corrosion resistance.
Condenser (Shell-and-tube Heat Exchanger):
Inner Tubing: Commonly made of copper or 316 stainless steel; the latter offers better corrosion resistance in complex water environments.
Outer Tubing: Mostly made of seamless steel pipe, galvanized to enhance rust resistance and pressure resistance.
Connecting Piping:
Refrigerant Piping: Commonly uses copper pipes; small household models typically use 6.35mm or 9.52mm diameter pipes.
Water Piping: PPR pipes (easy to connect) or seamless steel pipes (high strength) are optional.
Insulation Material: Commonly uses PEF rubber-plastic insulation cotton, typically 15–25mm thick, effectively reducing heat loss.
Outer Shell: Mostly uses corrosion-resistant coated steel plates or stainless steel plates; some products utilize five-fold rust prevention technology to extend lifespan.