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Introduction.

The growing trend of distributed energy systems projects in China

The Distributed Energy System can meet the diverse needs of the user (heat, cooling and electricity) while reducing the loss of efficiency during the transport of energy.

The analysis of the life cycle becomes a mainstream of evaluation methods.

1. investigates the difference in emission between the Distributed Energy System and the traditional energy system, which provides information on sensitivity factors such as HPR (relationship between heat and energy) and discussing several specific scenarios.

2. investigates 5 cases (Distributed Energy Systems in green buildings) in Spain and evaluates their performance. The investigation eliminates the scenarios. of sale of electricity to the grid and storage of energy, but it includes scenarios of different fuel prices, using LCA Method to evaluate the influence on the environment.
3. uses the calculation of the NPV to evaluate the performance of heat-electricity cogeneration projects, with scenarios of residual fuel sales.

4. Analyzes the economic viability of projects of distributed energy systems based on natural gas, simulating oil and gas prices as well as operating scenarios. The research makes several interesting assumptions to derive the point of equilibrium.

5. Investigate the integral value of the distributed energy system based on gas projects, with detailed calculation methods of economic value, user value, system value and environmental value.

6-7. They use the configuration of the machine to simulate and compare environmental performance.

8. Carry out a case study, comparing the emission of the project and that in an alternative case where heat, refrigeration and electricity are provided individually.

Our research framework is based on life cycle analysis (LCA). With output (electricity, heat and remained constant, we analyzed the input required by different technologies and we compared the life cycle) Energy consumption and GHG emission.

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The natural gas project saves 8% of energy and reduces GHG emissions by 38% compared to the traditional project using coal and electricity grid.

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The life cycle assessment (LCA) is a tool that can be used to evaluate the environmental impacts of a product, process or service from design to disposal, that is, throughout its life cycle, the so-called approach from the cradle to the grave. investigates the difference in emission between the distributed energy system and traditional energy system, which provides information on sensitivity factors such as HPR (relationship between heat and energy) and discussing several specific scenarios.

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You can observe six different cases that are exposed for distributed energy systems, and compare traditional coal projects with comprehensive electricity or generated for central electricity solar.

The energies generated by coal are still dominant for China and the systems of home and representation 85%. Solar energy and biomass is limited, but it is also more efficient, since it involves transport or other processes.

Sichuan energies such as solar energy and solar energy part of the consumption of the city and others that most of the normal electrical energy, and according to the studies of investment in the information of the city. It is best to take advantage of this situation, as well as the losses are up to 10% of this system.

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The life cycle analysis ACV

Application of LCA for GHG emitted and energy consumption in China's brewery by means of power generation with natural gas compared to traditional energy generation

It gave very important results in the reduction of GHG and energy savings, it can be concluded that with the implementation of new forms of energy generation through clean technologies the reduction of air pollution can reach 100% and the Application of clean energy to the brewery can exceed 50% of energy savings.

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We derive the energy consumption of the life cycle and the emission of GHG

Step 1:  Convert the output to energy input, as Eq. (1) shows. Ejk denotes the jth energy input (when

converted to electricity or heat) of the system in technology K.

Ejk=ΣiYijk/Cijk

Step 2: Use energy input to calculate life cycle energy consumption and GHG emission based on Former literatura GHG.
*Emission is measured as CO2 equivalent, as described in eq

GHGk=EMCO2+23EMCH4+296EMN2O=Ejk*bj

Step 3: Calculate the energy saving and emission reduction rate by comparing case k and case k.

REkk’=1-ΣjEjk/ΣjEjk’

RLCkk’=1-LCk/LCk’

RGHGkk’=1-GHGk/GHGk’

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Standards ISO 14040 and 14044

These standards are designed to that impacts to the environment in the production of any product or services during all the process from the acquisition of the raw material to the final disposition of the container or remains of the product and its derivatives, this is done through the life cycle analysis (LCA), which takes into account all aspects and impacts  that may affect the environment.