Abstract
The energy efficiency analysis is a prerequisite for the construction of the integrated energy system (IES). In this study, a novel energy efficiency analysis method is proposed considering different energy subsystems in the IES. First, the energy efficiency index of the subsystems and conversion devices is formed for elaborating their influence on the IES. The IES is composed of four energy subsystems, i.e., power/gas/heat/cooling subsystems, and six energy conversion devices. Next, the energy efficiency contribution models of energy subsystems and conversion devices are proposed based on their energy efficiency index, respectively. Then, in order to calculate the energy flow in the IES, an equivalent topological model of the IES weighted directed graph is proposed to calculate the energy efficiency contribution. Finally, an actual park is employed to illustrate the validity of the proposed analysis method.
Highlights
Energy is the fundamental and motivation of society development
It is assumed that the configured capacity of the combined heat and power (CHP) unit is equal to its operating power, the energy efficiency contribution of the park is calculated by using the energy efficiency contribution equation, and the evaluation period is 24 h
The results prove the validity of the calculation method of energy efficiency contribution
Summary
Energy is the fundamental and motivation of society development. With the rapid growth of the economy, the energy demand has a sharp increase. The energy efficiency represents the ratio of the demand to the supply of the power/natural gas/cooling/heat subsystem. The output is usually provided for power load and storage battery; otherwise, it is converted into other energy, i.e., natural gas, heat, and cooling energy: Wp,out
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