Optimum generation capacities of micro combined heat and power systems in apartment complexes with varying numbers of apartment units

Abstract

Micro-CHP 시스템의 발전부와 열회수부를 각각 모델링하여 시스템의 운전 거동을 예측할 수 있는 분 단위의 동적 시뮬레이션 프로그램을 개발하였다. 시뮬레이션 프로그램에 대한 검증은 LG에서 제공된 30 kW급 micro-CHP 시스템의 실험 데이터를 바탕으로 검증하였다. 시뮬레이션의 입력 값으로 사용하기 위한 가정용 전력과 급탕 부하 프로파일은 한국 정부에서 제공하는 통계 자료를 바탕으로 계산하였고, 이를 활용하여 설치 대상인 아파트 단지의 총 가구 수에 적합한 최적 용량을 경제성과 에너지 절감 모두에 초점을 맞추어 선정하였다. 내연기관 엔진을 기반으로 하는 가정용 micro-CHP 시스템의 발전 용량은 1에서 500 kW 사이로 가정하였고, 발전 용량에 따른 성능 차이를 반영하여 실제적인 접근을 시도하였다. 결과적으로 연간 절감액을 최대로 하는 시스템의 구성(발전부의 용량과 대수)은 에너지 절감의 측면에서도 뛰어난 성능을 보였다. 추가적으로 가정의 연간 전력부하분포를 통해 계산된 최빈수는 micro-CHP 시스템의 최적 용량을 선정하는데 주요한 인자임이 증명되었다.|A dynamic simulation of micro combined heat and power (micro-CHP) systems that includes the transient behavior of the system was developed by modeling the generation of electricity and recovery of heat separately. Residential load profiles were calculated based on statistical reports from a Korean government agency, and were used as input data to select the optimum capacities of micro-CHP systems based on the number of apartment units being served, focusing on both economic and energetic criteria. The capacity of internal combustion engine based micro-CHP was assumed to be in the range 1�500 kW, and the dependence of the efficiency of the generator unit on the capacity was included. It was found that the configuration (i.e., the capacity and number of generator units) that maximized the annual savings also had favorable energetic performance. Additionally, the statistical mode calculated from the annual electrical load distribution was verified as a suitable indicator when deciding the optimum capacity of a micro-CHP system.; A dynamic simulation of micro combined heat and power (micro-CHP) systems that includes the transient behavior of the system was developed by modeling the generation of electricity and recovery of heat separately. Residential load profiles were calculated based on statistical reports from a Korean government agency, and were used as input data to select the optimum capacities of micro-CHP systems based on the number of apartment units being served, focusing on both economic and energetic criteria. The capacity of internal combustion engine based micro-CHP was assumed to be in the range 1�500 kW, and the dependence of the efficiency of the generator unit on the capacity was included. It was found that the configuration (i.e., the capacity and number of generator units) that maximized the annual savings also had favorable energetic performance. Additionally, the statistical mode calculated from the annual electrical load distribution was verified as a suitable indicator when deciding the optimum capacity of a micro-CHP system.