Analysis of sewage from trunk canal in urban untreated sewage source heat pump system

Presents the technology of sewage getting from trunk canal in urban untreated sewage source heat pump system, gives the opening mode of trunk canal and the head loss calculation method, analyses the correlation relation between flow rate and other parameters such as gradient in gravity flow, points out the difference between theoretical water depth and practical water depth, deduces the relation between practical depth and the position parameters of openings and diversion tube, and gives a demonstration design. The study result shows that the velocity at opening should be 1.5 to 2 m/s, the head loss is between 180 to 330 mm, and the gradient of water diversion pipe should be determined by flow rate, pipe diameter and practical water depth.