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1.
小型风冷热泵制冷剂最佳充注量实验研究   总被引:3,自引:0,他引:3  
以R22为工质,通过对风冷热泵冷热水机组制冷剂充注量的实验研究,分析充注量对机组系统性能的影响及原因,提出机组性能改进措施及方法,实现风冷热泵节能优化.  相似文献   

2.
小型风冷热泵制冷剂充注量实验研究   总被引:1,自引:1,他引:0  
以R22为工质,通过对风冷热泵冷热水机组制冷剂充注量实验测试研究,全面分析充注量对测试机组系统性能的影响及原因.针对充注量的影响作者提出了机组性能改进措施及方法,实现风冷热泵节能优化。  相似文献   

3.
小型风冷热泵节流装置的替代实验研究   总被引:2,自引:0,他引:2  
本文以R22为工质,通过对风冷热泵冷热水机组节流装置替代后在不同的试验工况下进行实验测试,比较了系统使用热力膨胀阀和电子膨胀阀下制冷量和能效比,得出了使用电子膨胀阀可以提高系统性能的结论。  相似文献   

4.
风冷热泵和水源热泵空调系统的设计和应用   总被引:3,自引:0,他引:3  
林唐立 《制冷》1998,(1):6-11
本文分析了风冷热泵和水源热泵空调系统的特点,应用条件和设计应用注意的几个问题。  相似文献   

5.
风冷热泵作为空调系统的冷,热源之一,具有许多特点得到广泛应用。近年来发展迅速,但问题也不少,本文针对当前风冷热泵的现状,提出了改进与提高的措施以及它的发展前景。  相似文献   

6.
本文分析了风冷热泵的结箱条件和过程,提出了除霜的方法,并就风冷热泵发民中的几个问题和前景进行了讨论,可供设计和管理人员参考。  相似文献   

7.
风冷热泵内部结构特点及其在工程上的应用   总被引:1,自引:0,他引:1  
本文就风冷热泵的蒸发器、冷凝器及自控设备等的内部结构,技术参数和在工程中的应用情况及范围等进行了探讨,可供设计和管理人员参考。  相似文献   

8.
家用中央空调及其有关问题讨论(一)   总被引:5,自引:0,他引:5  
刘宪英  陈延林 《制冷》2002,21(1):26-30
本文介绍了目前家用中央空调产品的现状及其优缺点的分析 ,其中包括小型风冷热泵冷热水机组、风冷热泵管道式分体空调系统 (管道机 )、VRV系统、水源热泵系统和燃气中央空调 ,最后对家用中央空调的冷热负荷进行了讨论。  相似文献   

9.
本文在浅埋地下建筑风冷热泵空调系统围护结构传热动态模拟的基础上,通过对南京市太园地下旅社围护结构传热的实时测试,验证动态传热模型及计算机模拟方法的可行性和正确性,为浅埋地下建筑风冷热泵空调系统的装机容量、节能指标和设计计算提供一定的理论依据。  相似文献   

10.
风冷热泵机组运行测试及分析   总被引:3,自引:0,他引:3  
风冷热泵机组在我国被广泛用作空调系统的冷热源,尤其是在长江中下游地区.本文对在运行中风冷热泵机组进行测试,并对其性能进行了分析.要充分提高风冷热泵运行的效率,应注意空调系统与机组的匹配,注意机组自控设置等.  相似文献   

11.
对R22、R407c、R134a三种制冷剂的基本物性及热力性能进行了分析比较,并在风冷螺杆热泵机组基础上进行了替换试验研究。结果表明:R407c为最佳替换R22的制冷剂;R134a替换后能效比较高,但制冷(热)量衰减过多,同时R134a的运行压力过低不太适合热泵工况。  相似文献   

12.
Performance of a heat pump system using hydrocarbon refrigerants has been investigated experimentally. Single component hydrocarbon refrigerants (propane, isobutane, butane and propylene) and binary mixtures of propane/isobutane and propane/butane are considered as working fluids in a heat pump system. The heat pump system consists of compressor, condenser, evaporator, and expansion device with auxiliary facilities such as evacuating and charging unit, the secondary heat transfer fluid circulation unit, and several measurement units. Performance of each refrigerant is compared at several compressor speeds and temperature levels of the secondary heat transfer fluid. Coefficient of performance (COP) and cooling/heating capacity of hydrocarbon refrigerants are presented. Experimental results show that some hydrocarbon refrigerants are comparable to R22. Condensation and evaporation heat transfer coefficients of selected refrigerants are obtained from overall conductance measurements for subsections of heat exchangers, and compared with those of R22. It is found that heat transfer is degraded for hydrocarbon refrigerant mixtures due to composition variation with phase change. Empirical correlations to estimate heat transfer coefficients for pure and mixed hydrocarbons are developed, and they show good agreement with experimental data. Some hydrocarbon refrigerants have better performance characteristics than R22.  相似文献   

13.
为了满足逐步严苛的环保法规要求,R1234yf成为车用热泵制冷剂R134a的热门替代制冷剂之一。本文对R1234yf热泵技术的研究进行了综述与分析,其GWP<1,各方面性质均符合车用热泵系统的工作需求。在传热效果上,R1234yf的沸腾传热性能略优于R134a,且冷凝过程压降比R134a低5%~10%,优于R134a系统。在诸多R1234yf和R134a系统的仿真和实验研究中,R1234yf热泵性能略低于R134a,但可以通过优化零部件、强化补气、改善工况等方式使其与R134a十分接近甚至超越。R1234yf低压饱和压力比R134a高约15%,可以适配更高的压缩机转速,低温下制热性能比R134a更好,且较低的压缩机排气温度使系统工作更为稳定,强化补气的效果也优于R134a。因此,R1234yf在车用热泵中具有较好的工作性能和发展前景,可以作为R134a的替代制冷剂。  相似文献   

14.
普通热泵空调系统在超低温环境下制热衰量减大,难以满足中国北方冬季取暖需求,在一套普通R410A风冷冷(热)水机组上分别对喷液技术和EVI技术进行超低温环境测试对比。结果表明,喷液系统和EVI系统在低温和超低温下具有较好的制热量及制热能效的提升,并且可以解决普通热泵在超低温环境下的应用问题,同时R32的热物理性质与R410A基本相同,提出在低温风冷冷(热)水机组上使用R32替代R410A的设想。  相似文献   

15.
制冷空调领域内使用量最大的HCFCs制冷剂目前正处于加速淘汰的阶段,替代品、替代技术路线的选择至关重要.本文介绍R32,R1234yf(R1234ze),ZCI系列和DYR系列等新型合成类替代制冷剂的最新研究进展,从基本热物性、传热特性、理论循环、机组性能等多个角度与最主要的HCFCs制冷剂R22进行对比,并分析部分替代品的应用前景,为我国制冷空凋行业制冷剂替代工作提供参考.  相似文献   

16.
周子成 《制冷》2014,(4):31-38
低GWP是选择替代制冷剂的一个重要特性,HFC-1234族具有低GWP的特性。因而适用于空调和制冷使用。本文介绍HFO-1234ze(E)以及它与HFC-32的混合物作为蒸气压缩式热泵和制冷系统的低GWP替代物制冷剂。  相似文献   

17.
Microfin tubes are widely used in air cooled and water cooled heat exchangers for heat pump and refrigeration applications during condensation or evaporation of refrigerants. In order to design heat exchangers and to optimize heat transfer surfaces, accurate procedures for computing pressure drops and heat transfer coefficients are necessary. This paper presents a new simple model for the prediction of the heat transfer coefficient to be applied to condensation in horizontal microfin tubes of halogenated and natural refrigerants, pure fluids or nearly azeotropic mixtures. The updated model accounts for refrigerant physical properties, two-phase flow patterns in microfin tubes and geometrical characteristics of the tubes. It is validated against a data bank of 3115 experimental heat transfer coefficients measured in different independent laboratories all over the world including diverse inside tube geometries and different condensing refrigerants among which R22, R134a, R123, R410A and CO2.  相似文献   

18.
In order to decrease the earth's energy imbalance degree, an R744 ground source heat pump system (GSHPS) with air-cooled and water-cooled gas coolers was designed, and the performances of this system were analyzed numerically. The results show that, for the proposed R744 system in different regions, the earth's energy imbalance degree can always be decreased to zero by optimizing the cooling load proportion of air-cooled gas cooler. Comparing with the system without air-cooled gas cooler, the investment cost of the proposed R744 system is decreased by 14.5–25.5% due to the decreasing cost of ground heat exchanger, and the coefficient of performance is increased. With the increase of ground heat exchanger depth, the performance deteriorates, and the ground heat exchanger with shorter depth is preferred in the GSHPS. The investment and operation costs of the proposed R744 system are lower than that of the existing R134a system.  相似文献   

19.
赵海波  杨昭 《制冷学报》2012,33(5):32-36
结合我国现行制冷剂标准,按照环境相容性、安全性、热工循环性能原则进行了高温复叠式热泵循环的制冷剂筛选,对不同制冷剂组合进行了计算和分析。结果表明,高低温侧制冷剂可采用R245fa/R134a、R245fa/R420A、R245fa/R413A、R245ca/R420A等组合。若进一步考虑制冷剂获得的容易程度、经济性等因素时,可选择R245fa/R134a组合。  相似文献   

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