风冷式小型冰蓄冷系统蓄冰过程实验研究

冰球式蓄冷系统作为蓄冷空调的一种形式被越来越广泛的应用。本文通过具体试验，对风冷式小型冰蓄冷系统的蓄冰过程进行了研究，对系统中风冷式制冷机组的性能以及蓄冰罐的性能作出了分析，为冰蓄冷系统的优化设计提出了指导性建议。     

冰蓄冷空调VAV模型研究

研究冰蓄冷空调中的变风量送冷系统、分析了其可行性。结合实际的工程案例，为冰蓄冷空调中ＶＡＶ建立了数学物理模型。模型摒弃了从研究蓄冷元性能出发模拟蓄冷器充放冷过程性能的传统思路，提出了蓄冷器综合有效热阻的处理方法。得出送冷系统中送冷量与风机风量，充量，换风比例，蓄冷剂温度有室内外温度关系。     

用人工神经网络预测冰蓄冷系统蓄冰时间

蓄冰时间的预测对于冰蓄冷空调系统的设计和运行控制十分重要。在本文中,作者以理论计算数据作训练集、验证集、测试集,采用BP型人工神经网络预测了板单元冰蓄冷系统的蓄冰时间．取得了令人满意的结果。与采用差分数值计算相比,用神经网络可大大缩短计算时间。     

一种天然混合工质在家用空调系统中替代R22的实验研究

提出了一种三元混合工质,R1270/DME/R245fa(75%/15%/10%,质量),作为家用空调R22替代制冷剂。其中质量比10%的R245fa作为阻燃剂,使制冷剂安全性能满足指标。并运用Refprop 8.0计算了新工质的热力学性质,与被替代工质R22进行对比分析,并在实验台上依据冷水(热泵)机组国家标准给定的各实验工况对该工质及R22进行了对比实验,结果表明,在对原机组不做任何改动的情况下,相同运行条件,采用新工质系统与原R22系统相比性能参数相近,制冷量增大,COP值有较大幅度提升。新型天然混合工质可作为R22在家用空调系统中直接灌注式替代物。     

微通道换热器在家用空调上的应用研究

微通道换热器的应用日益普遍。本文通过将微通道换热器引入3 HP柜式家用空调,并对其性能和充注量等与原机进行了对比,对微通道在家用空调领域的应用进行了研究。从结果可以看出:当只更换室内换热器时,系统的充注量由原来的2200g降到1850g左右;与原机相比,制冷时系统的制冷量略降低1%、COP提高2.2%;制热时系统的制热量比原机提高3.9%、系统COP则提高了11.2%。当将室内外的管片式换热器都更换为微通道换热器后,系统的充注量由原来的2200g降到1000g左右;与原机相比,制冷量提高0.8%,系统COP则提高5.2%。     

内融冰式蓄冰桶实验研究

本介绍在小型实验台上模拟内融冰式蓄冰桶的制冰和融冰过程,测量蓄冰桶水温、盐水进出口温度和冰层厚度等参数,并与理论计算进行比较,两吻合较好。     

中国蓄冷技术应用的新进展

本文介绍了我国电力部门实行电力供应峰谷不同电价政策。统计了我国发展冰蓄冷空调工程情况 ,提出了今后的努力方向。     

自然工质在家用空调中灌注式替代HCFC22的研究

对自然工质ＨＣ２９０和ＨＣ１２７０进行了在小型家用空调系统中灌注式替代ＨＣＦＣ２２的循环性能实验研究,结果表明实验条件下两种自然工质系统的制冷量、ＣＯＰ和压缩机排气温度等循环性能指标均优于ＨＣＦＣ２２。实验过程中两种自然工质性能稳定未观察到与材料不兼容的现象;工质的可燃性在精心的实现操作中亦未构成困难。     

冰蓄冷空调系统的改造及应用

本文对中电大厦A座空调系统进行了全蓄冰改造,并分析比较了全蓄冰空调系统与部分蓄冰空调系统在分时电价下运行的经济效益,得出全蓄冰空调系统比部分蓄冰空调系统节能显著,经济效益好.     

家用中央空调系列讲座（2）——家用中央空调设计要点

家用中央空调与一般的中央空调一样，有一个集中的冷热源和完整的空调系统。要获得能耗小、运行稳定、安全可靠、使用舒适满意、卫生健康的家用中央空调，就必须象一般的中央空调系统一样，把握好设计、施工和运行调试三个关键阶段，其中设计是首要的，也是非常重要的。同时，要想完成一个优秀的家用中央空调的设计，就必须充分了解它自身的特点和适用的设计规范，贯彻到设计的每一个部分，包括负荷计算、系统选择和设计、设备与管路布置等。     

冰储冷空调应用综述

概述了冰储冷空调在国内外的发展状况,对几种不同的冰储冷空调的技术性能作了比较,列举了国内5个工程应用实例,充分说明冰储冷空调比传统的常规空调有明显的优点,最后对冰储冷空调的发展作了展望.     

小型蓄冷空调系统动态性能研究

阐述小型空调系统的工作原理和循环特性,分析了该蓄冷空调系统在不同工况下的性能,讨论了不同工况下的过冷度对该系统性能的影响.     

Experimental study on cooling performance of air conditioning system with dual independent evaporative condenser

Evaporative condenser is an energy efficient and environmentally friendly air conditioning equipment. This paper proposed an air conditioning system using dual independent evaporative condenser and investigated the cooling performance. Many factors, such as evaporator water inlet temperature, compressor frequency, air dry-bulb temperature, air velocity and water spray rate, which influenced the cooling performances of air conditioning system with evaporative condenser have been investigated. The results indicated that cooling capacity and coefficient of performance (COP) increased significantly with the increasing of evaporator water inlet temperature (12–25 °C), the air velocity (2.05–3.97 m s⁻¹) and the water spray rate (0.03–0.05 kg m⁻¹ s). However, COP decreased with the increasing ambient air dry-bulb temperature (31.2–35.1 °C) and the compressor frequency (50–90 Hz). Furthermore, the heat transfer coefficient (K₀) was 232–409 W m⁻² K⁻¹ in different air velocity and water spray rate.     

车辆空气质量及空调系统探讨

新冠肺炎病毒疫情下车辆用户及汽车产业链都对空气质量进行热议,从使用和开发及生产角度提出了不同的要求和看法,健康汽车概念成为关注的焦点。空气质量作为车辆空调系统舒适性指标的一个维度,也需要从用户需求、法规标准、现有技术及技术应用成本几个方面进行考量,通过法规标准和市场推广两个轮子驱动,在整车厂和车辆空调厂家的合作和共同努力下,才能做好车辆空气质量的技术路径选择、产品开发和品质提升。     

冰蓄冷中央空调系统设计软件

空调蓄冷技术是为民网电力移峰填谷而兴起的一门实用综合技术，为缓解当前电力供应的紧张状况，蓄冷技术在我国逐渐得到推广与应用，文章就蓄冷空调笼设计的设计手段，开发了冰蓄冷空调系统设计的计算与选型软件，对软件进行了较详细的介绍。     

带闪蒸器的家用变频空气源热泵试验研究

对带闪蒸器的家用变频空气源热泵在制冷及制热工况下进行测试,结果表明,整机能力和能效在高温制冷及低温制热工况下均有较大幅度的提升,适用于气候工况较为恶劣的地区。     

水源热泵在户式中央空调中的应用分析

论述水源热泵在住宅中应用的特点以及水源热泵在推广应用中的相关问题。     

Experimental performance analysis and modelling of liquid desiccant cooling systems for air conditioning in residential buildings

The paper presents a new desiccant cooling cycle to be integrated in residential mechanical ventilation systems. The process shifts the air treatment completely to the return air side, so that the supply air can be cooled by a heat exchanger. Purely sensible cooling is an essential requirement for residential buildings with no maintenance guarantee for supply air humidifiers. As the cooling power is generated on the exhaust air side, the dehumidification process needs to be highly efficient to provide low supply air temperatures. Solid rotating desiccant wheels have been experimentally compared with liquid sorption systems using contact matrix absorbers and cross flow heat exchangers. The best dehumidification performance at no temperature increase was obtained in an evaporatively cooled heat exchanger with sprayed lithium chloride solution. Up to 7 g kg⁻¹ dehumidification could be reached in an isothermal process, although the surface wetting of the first prototype was low. The process then provides inlet air conditions below 20 °C for the summer design conditions of 32 °C, 40% relative humidity. With air volume flow rates of 200 m³ h⁻¹ the system can provide 886 W of cooling power.A theoretical model for both the contact absorber and the cross flow system has been developed and validated against experimental data for a wide range of operating conditions. A simulation study identified the optimisation potential of the system, if for example the surface wetting of the liquid desiccant can be improved.     

Experimental study on the improvement of CO2 air conditioning system performance using an ejector

Several preceding researches have evidenced that the transcritical air conditioning system using CO₂ as a refrigerant has an inherent inefficiency resulting in degraded steady-state system performance of a CO₂ air conditioning system compared with that of a conventional air conditioning system. As a practical improvement, two-phase ejector was considered in place of expansion device in this study. The two-phase ejector for CO₂ air conditioning system was designed and developed considering the non-equilibrium state for evaluating the sonic velocity and the critical mass flux. The experiments of performance with respect to variation of ejector geometry such as the motive nozzle throat diameter, mixing section diameter and the distance between motive nozzle and diffuser were carried out. There exist optimum design parameters in each test. Experiments showed that the coefficient of performance of the system using an ejector was about 15% higher than that of the conventional system.