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Operational analysis of open intake technology in untreated sewage source heat pump system

As a new renewable energy, urban sewage has the characteristics of the widely distribution and the huge amount when using in the heat pump system, as well as the significant advantages on energy-saving and environmental protection. However, considering of the complexity of its components, the heat exchanger will be blocked in a short time for the large-scale contamination in the sewage without any anti-clogging method, then the operation of the system will be unsafe. Therefore, the effective sewage intake technology is the precondition to work reliably in the untreated sewage source heat pump system. In view of the insufficiency of current sewage intake technologies, an open sewage intake integration technology is proposed. Through the definition of some important operating parameters, such as the blocking coefficient, the contamination density, the section coefficient, the mathematical model and the distinguish basis of critical state are established for the sewage intake characteristic, then the change rule of each critical operation parameter is observed along with the various initial parameters. The obtained analysis result can provide the theory foundation to the design of the open intake integration technology.