Simulation and optimization of SOFC-BCHP system

As the prime motor of dispersed energy system, the high-temperature solid oxide fuel cells (SOFC) are high efficient with large heat recovery. This study presents a simulation of SOFC building-based cooling, heat and power (BCHP) system, which can meet basic requirements in power and heating (cooling) of the designated customers. The peak power load can be met by power grid, while the peak heating (cooling) load requirement can be met by backup equipments. In order to solve the economic dispatch problem of the energy system, a restricted nonlinear optimization model has been developed. The production costs can be minimized via both the equality constraints of customer’s heat and power demands, and other inequality constrains of equipments’ capacities. The sequential quadratic programming method has been used to search the solution. The study indicates that the model can be used to optimize the system’s capacities and run strategy. An office building case has been computed, and it is indicated that the model can be served in design and optimization of SOFC-BCHP system.     

Parametric analysis and optimization of a building cooling heating power system driven by solar energy based on organic working fluid

Building cooling heating power (BCHP) systems as a kind of distributed energy resource have shown a great potential in improving energy efficiency and meeting multiple energy demands in buildings. In this paper, we present a BCHP system driven by solar energy with flat‐plate solar collectors. A modified system efficiency is introduced to evaluate the whole day performance of the system more accurately. Based on the mathematical models and simulation platform established, we have investigated the influences of some key thermodynamic parameters, namely condensation temperature, turbine inlet temperature and turbine inlet pressure on the system performance. In order to find the optimum combination of these parameters that leads to the best performance, we have performed parametric optimization by means of the genetic algorithm. Results indicate that the best performance and the highest efficiency of the system are achieved when the working fluid reaches its saturated state and the corresponding efficiencies of the system operating in the combined heating power mode, the combined cooling power mode and the power production mode turn out to be 19.10%, 27.24% and 10.47%, respectively. Copyright © 2012 John Wiley & Sons, Ltd.     

Particle swarm optimization for redundant building cooling heating and power system

An optimal and redundant building cooling heating and power (BCHP) system can yield economical savings, but more importantly can save energy as well as reduce the emission of pollutants. This paper presents the energy flow analysis of the conventional separation production (SP) system and the redundant BCHP system. Four decision variables (the capacity of power generation unit (PGU), the capacity of heat storage tank, the on–off coefficient of PGU and the ratio of electric cooling to cool load) to be optimized are selected in consideration of the design and the operation strategy of BCHP system. An objective function to simultaneously measure the energetic, economical and environmental benefits achieved by BCHP system in comparison to SP system is constructed and maximized. Particle swarm optimization algorithm (PSOA) is employed to search the optimal solutions. A case study of BCHP system with thermal storage unit and hybrid cooling system is presented to ascertain the feasibility and validity of the optimization method.     

楼宇冷热电联供系统的变工况及热力学分析

燃气轮机的楼宇冷热电联供系统是一种有前途的节能和环保的能源系统，该文对1个己运行了4年的系统进行了变工况和热力学分析计算，得出了该系统在夏季的设计负荷和变工况条件下能源效率和Yong效率的数据，并进行了讨论和给出了结论。     

节能理念在清华环境能源楼的应用

本文简要介绍了清华环境能源楼在节能领域的各类应用,并重点阐述了控制系统在此项目中所发挥的作用。     

北京市某大型公共建筑三联供系统的优化

建立了以年度费用最小为目标函数的优化数学模型,对冷热电三联供系统的配置和运行方案进行了优化。结果表明,年度运行费用明显少于传统配置方案,但运行能耗却与传统配置方案相当。     

燃料电池在建筑热电冷三联供中的应用分析

分析了燃料电池的工作原理、种类、性能参数及主要特点,认为燃料电池将有可能发展成为供热、供冷系统的主要热源方式之一,燃料电池热电冷三联供系统是建筑节能的有效途径;介绍了燃料电池在某建筑热电冷三联供系统的应用情况,并分析指出燃料电池在暖通空调领域的研究方向.     

楼宇冷热电联产(BCHP)系统的特点及设计概要

冷热电联产(BCHP)系统是分布式能源的一种应用形式.针对其目前的发展状况,详细介绍了楼宇冷热电联产系统的特点和7种应用模式;对系统的设计选型作了简要的论述,并指出系统的设计选型应根据不同建筑的需求来确定.     

Influence analysis of building types and climate zones on energetic,economic and environmental performances of BCHP systems

The performance of building cooling heating and power (BCHP) system is obviously dependent upon the seasonal atmospheric conditions and the building types. This paper presents the energy flow analysis and the evaluation criteria of the redundant BCHP system and describes the optimal design method. The BCHP systems for four building categories (Hotel, Office, Hospital and School) in five climate zones (Severe Cold Zone, Cold Zone, Hot Summer and Cold Winter Zone, Mild Zone and Hot Summer and Warm Winter Zone) in China are compared and evaluated from energetic, economic and environmental aspects. The comparison results show that the BCHP system is generally suitable for the building, which operates for long time over the entire year, in the climate zone where buildings require more heat for space heating. Moreover, the influence analysis on BCHP capacity and operation strategy indicates that the capacity of power generation unit (PGU) is the most sensitive design parameter to influence the integrated performance of the BCHP system.     

小区冷热电联供系统的空调期优化运行研究

1前言冷热电联供系统(CCHP)是一种建立在能的梯级利用概念基础上,同时产生电能和可用热(冷)能的能源系统。目前国内大多用燃气轮机或燃气内燃机作为原动机,利用高品位的热能发电,低品位的热能供热和制冷,从而大幅度提高系统的总能效率。这种系统有助于电网和燃气供应的削峰填谷