摘要
针对家用空调器在企标室外53℃,室内35℃/26℃工况下制冷能力衰减的问题,提出基于单级蒸汽压缩制冷系统的高压两相喷射空调系统方案。首先理论分析高压两相喷射技术对提升空调高温制冷能力的影响,即相同频率下可降低压比和排气温度。并在焓差室中搭建经过改造的家用空调器,保持辅路截止阀开度固定,通过调节压缩机频率和主阀开度,测量制冷系统相关参数,分析辅路对提升系统制冷量的作用以及对压缩机运行参数的影响。结果表明,增设的辅路可有效降低53℃工况下压缩机排气温度,最大可降低26℃,通过升频,制冷能力可提升8%,实现标称制冷能力。增设辅路改善排气温度会降低系统制冷量,因此在设计带高压两相喷射的蒸汽压缩制冷系统时,要兼顾主路和辅路的制冷剂流量分配。
To address the issue of cooling capacity degradation in household air conditioners under extreme operating conditions(outdoor temperature:53℃,indoor temperature:35℃/26℃ as enterprise standards),a high-pressure two-phase injection air conditioning system based on a single-stage vapor compression refrigeration cycle is proposed.First,a theoretical analysis is conducted to evaluate the impact of high-pressure two-phase injection on improving high-temperature cooling performance—specifically,its ability to reduce pressure ratio and discharge temperature at the same compressor frequency.A modified household air conditioner was set up in an enthalpy difference laboratory.With the auxiliary expansion valve opening fixed,key refrigeration system parameters were measured by adjusting compressor frequency and the main valve opening.This allowed analysis of the auxiliary circuit's effect on enhancing system cooling capacity and its influence on compressor operating parameters.Results show that the auxiliary circuit effectively reduces compressor discharge temperature under 53℃ conditions,with a maximum reduction of 26℃.By increasing frequency,cooling capacity can be improved by 8%,achieving nominal cooling performance.While the auxiliary circuit improves discharge temperature,it may reduce overall system cooling capacity.Therefore,when designing a vapor compression refrigeration system with high-pressure two-phase injection,refrigerant flow distribution between the main and auxiliary circuits must be carefully balanced.
作者
朱福临
许强强
栗江涛
张铭
王定远
李兆祺
ZHU Fulin;XU Qiangqiang;LI Jiangtao;ZHANG Ming;WANG Dingyuan;LI Zhaoqi(Qingdao Haier Smart Technology R&D Co.,Ltd.,Qingdao 266103;National Engineering Research Center of Digital Home Networking,Qingdao 266103)
出处
《家电科技》
2025年第5期78-82,共5页
Journal of Appliance Science & Technology
基金
青岛市博士后基金(QDBSH20220202068)
山东省重点研发计划资助(No.2022CXGC020203)。
关键词
高压两相喷射
高温制冷
100%制冷能力
High-pressure two-phase injection
High temperature cooling
100%Cooling capacity
