基于性能曲线的离心式冷水机组能耗分析
Energy consumption analysis of centrifugal chillers based onperformance curves
摘要：
冷水机组运行能耗作为建筑能耗的主要组成部分之一,在设计阶段应充分考虑。由于设计阶段较难获取冷水机组在不同运行工况下的能效特性曲线,目前冷水机组运行能耗主要采用不同负载率下的机组分级能效或机组综合能效进行简化计算,忽略了运行工况及室外环境对机组能效的影响。本文通过对离心式冷水机组性能特性进行分析,并结合市场上主流厂家提供的离心式冷水机组变工况运行能效数据进行了性能曲线拟合及验证。以某建筑为例,对比分析了不同能耗计算方法下的冷水机组运行能耗。
Abstract：
As one of the main components of building energy consumption, the operating energy consumption of chillers should be fully considered in the design stage. Due to the difficulty in obtaining the energy efficiency characteristic curves of chillers under different operating conditions in the design stage, the current operating energy consumption of chillers is mainly calculated by using the graded energy efficiency under different load rates or the comprehensive energy efficiency of chillers for simplified calculation, often ignoring the influence of the operating conditions and outdoor environment on the energy efficiency of chillers. In this paper, the performance characteristics of centrifugal chillers are analysed, and the performance curves are fitted and verified in combination with the energy efficiency data of centrifugal chillers under variable operating conditions provided by mainstream manufacturers in the market. Taking a building as an example, the operating energy consumption of chillers under different energy consumption calculation methods is compared and analysed.
Keywords:chiller; factor affecting energy efficiency; operating condition; performance curve; energy consumption; calculation method