Bench and method for testing heat conductivity coefficient of heat exchange tube of EGR cooler

The invention discloses a test bench and method for testing the heat conductivity coefficient of the heat exchange tube of an EGR cooler. The test bench comprises a base body, a water storage chamber, a piston and a spring fixing bolt, wherein the base body is of an externally-sealed structure, the water storage chamber is arranged on the left in the base body, and a piston chamber and the spring fixing bolt which are sequentially connected are arranged on the right in the base body; the piston and a spring are arranged in the piston chamber, and the spring is arranged on the right of the piston; the spring is connected with the spring fixing bolt on the right of the spring; the heat exchange tube is arranged in the water storage chamber, the outside of the gas inlet end of the heat exchange tube is connected with the base body, and the outside of the gas outlet end of the heat exchange tube is connected with the piston; the gas outlet end of the heat exchange tube is connected with a hot air source outlet tube; a gas temperature sensor probe is arranged in the heat exchange tube, and a surface-mounted temperature sensor is arranged on the outer wall of the heat exchange tube; Each of the water inlet and the water outlet of the water storage chamber is provided with a temperature sensor. The test bench has the advantages that the heat conductivity coefficient of the heat exchange tube can be measured without destroying the heat exchange tube, the polluted heat exchange tube can also be measured, and the test bench is simple in structure, convenient to use and high in practicality.