Impact of lubricant in the performance of variable speed heat pumps working with R290

Numerical Simulation of Foundation Pit Dewatering Based on FEFLOW-taking Pumping Station a as an Example

“…There is a large population concentration in cities, and if the drainage system is not perfect, it will have a constraining effect on urban development. Therefore, to ensure the safety of urban flood control and drainage, it has become a key focus of river flood control [1][2][3][4]. Urban flood control and drainage engineering facilities are an important component of urban infrastructure.…”