CCHP System Energy Analysis

Heat and power cogeneration is an effective way to conserve energy. With the development of absorption refrigeration technology, the CCHP comes into pepole’s view. Resource conservation and clean production are imperative in terms of current energy use and environmental issues. CCHP technology which distinguishes the quality between power, heat and cooling realizes the cascade utilization of energy, and reduces emissions. This technology has caused great attention, and develops rapidly.In this paper, the system’s research status, the system’s operational principle and energy-saving feature of CCHP system are introduced. CCHP which starts comparatively late in China although has certain restrictions, it has some foundation for development. CCHP systems use high-grade heat to produce electricity, use low-grade heat to achieve heat and cooling supply. The system which realizes the scientific principle of energy use according to quality, improves energy efficiency, and saves primary energy. In order to highlight the energy-saving characteristic of CCHP systems, theoretical analysis is taken advantage of in this paper. This paper also introduces some evaluation indexes which are commonly used for energy-saving characteristic. Primary energy rate is based on the first law of thermodynamics. Energy efficiency is based on the second law of thermodynamic.The performance and the equivalent thermal coefficiency of refrigerator are about the cooling part of CCHP. Energy cascade utilization rate is a new evaluation index. Coal-saving amount is a direct evaluation index. In order to validate the CCHP system’s economy, this paper also makes the comparative calculation between CCHP and generation systems, the result confirms that CCHP systems have energy-saving characteristic.