Qing Rong Liu

Optimal Sizing for the CCHP System Based on Software LINGO

In this paper, a model to optimize the system capacity size of the CCHP system based on a commercial software package LINGO is introduced and an illustrative example is presented. The model calculates the optimal size for the CCHP system applied in ST building and analyzes the variation trend of the annual cost saving ratio which is affected by the annual running and maintenance cost and annual investment cost. The influence of the energy price on the system is also be analyzed. When electricity price rises, the CCHP system is more economic than the conventional energy supply system. The CCHP optimal capacity size increases when electricity price rises. When natural gas price rises, the CCHP optimal capacity size decreases and it has poor economy.

Economic Analysis of Biogas Cogeneration Systems of Medium-Sized Breeding Plants

More and more countries are focusing on the lack of resources with the consumption of large quantities of fossil energy. The Chinese government is actively promoting the policies related to the transformation of the energy structure which will increase the proportion of clean energy consumption and reduce the proportion of fossil energy consumption in order to relieve the pressure on domestic energy. Interest in the generation of biogas from agricultural residues is increasing rapidly due to its climate benefits. This article is committed to analysis the economic performance of the biogas cogeneration energy supply system of livestock and poultry breeding plants in southern China. The model of the biogas cogeneration energy supply system of livestock and poultry breeding plants in southern China and the advices to the government will also been proposed as a result. According to the results, biogas cogeneration system is feasible in economy with reasonable device configuration and operating strategy.

Optimal Option Analysis of Distributed Generation Equipments

In the application of distributed generation technologies, different building have its own heat-to-power ratio, therefore equipment selection is a key point to determine the energy saving ratio. This study analyzes some devices of four different types, from two basic managements, heat-tracking and electricity-tracking. Result shows the optimal heat-to-power ratio of some certain devices and the changing trends were also given out. The energy saving ratio were also calculated.

Running Strategy Optimization of Micro-Cogeneration System in Residential Building

This paper optimizes the running strategy of residential cogeneration system, through discussing the introduction effect of a hypothetical cogeneration system for a detached house. Based on the seasonally electricity and thermal load characteristics, several annual running strategies were set considering the cogeneration equipment’s efficiency (electricity generation and thermal recover efficiencies). By simulating hourly operation condition, the yearly energy consumption, CO2 emission and energy cost were discussed. Then, the effect of running strategy were evaluated in the view of energy saving, energy cost and environmental effects. Analysis results is that the optimal running strategy is different for different co-generation equipment’s efficiency, and then the running strategy design should considering not only energy demand but also the equipment’s efficiency performance for residential cogeneration system.

Feasibility Study on Combined Heat and Power with Different Distributed Generation Technologies for Various Commercial Buildings

This paper has examined the energy consumption characteristics for six different buildings including apartments, offices, commercial buildings, hospitals, hotels and educational facilities. Then 50000m2 development site for respective building’s type has been assumed as case study to evaluate the introduction effect of Combined Heat and Power (CHP). All kinds of CHP systems with different distributed generation technologies including Gas Turbine (GT), Gas Engine (GE), Diesel Engine (DE), Solid Oxide Fuel Cell (SOFC) and Polymer Electrolyte Fuel Cell (PEFC), have been simulated by using HEATMAP, CHP system analysis software. And their primary energy utilization efficiency, energy saving ratio and CO2 reduction ratio have evaluated and compared respectively. The results can be summarized as follows: various buildings have their special heat to power ratio characteristics. Matching the heat to power ratio demanded from an individual building with that supplied from a CHP system is very important. It is necessary to select a reasonable distributed generation technologies according to the load characteristics of various buildings. Distributed generation technologies with high energy generating efficiency and low heat to power ratio, like SOFC and PEFC is more reasonable selection for Building Combined Heat and Power (BCHP). CHP system is an attractive option for hotels, hospitals and apartments. The users can achieve high energy saving and environmental benefit by introducing a CHP systems. In others buildings, especially like commercial buildings and offices, the introduction of CHP system is unreasonable.