Piping network performance of secondary pump water systems under part loads

Uses the software Flowmaster for analysing the piping network performance of secondary pump variable water volume system under terminal loop pressure difference control and pressure difference control between supply and return mains. The results show that every passage of the system appears underflow under part loads when using the former control method,while overflow when using the latter control mode, and that the flow allocation of central air conditioning water system relates to not only the unilization ratio of thermal users but also the location pattern of them. Puts forward a variable pressure difference control method, and the results of simulating and analysing show that the flow allocation of every passage improves obviously under the part load.