Research Progress of Air Source Heat Pump Defrosting Technology Based on Frost Layer Measurement
The efficient defrosting of air-source heat pump is a technical problem,and accurate measurement of frost layer thickness can provide the most reliable basis for the selection of defrost control points.This paper summarizes and analyzes the existing defrost control methods based on frost layer measurement,including digital micrometer,vernier ruler,scanning probe microscope,laser thickness measurement,neutron ray,photoelectric conversion,sensor,image processing,acoustic signal and artificial intelligence.Its advantages and limitations are compared and analyzed,which provides a reference for the future research direction of defrost control methods based on frost layer measurement.