Factor Analysis for Evaluating Energy-Saving Potential of Electric-Driven Seawater Source Heat Pump District Heating System Over Boiler House District Heating System

摘要

Although the seawater source heat pump district heating system is often regarded as a renewable energy utilization system, it cannot be guaranteed to obtain the energy-saving effect. The authors provided an energy-saving judgement method for the electric-driven seawater source heat pump district heating system over the conventional boiler house district heating system in former research. However, many factors will influence the energy efficiency of the system. In order to enhance its energy efficiency and make the best use of the system, detail analysis of those factors is conducted in the paper. First, an energy-saving potential evaluation model is derived for the system with part-time operation mode. Then all the factors influencing the energy efficiency of the system are ascertained and analyzed. These factors include the electricity generation efficiency, energy performance of seawater source heat pump units, the seawater temperature, the energy consumption of the seawater pump, the local outdoor air temperature, and the heating district radius. The research results are expected to provide clear directions for the seawater source heat pump system to raise its energy efficiency.