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1.
分析了直冷电冰箱单路、双路、多路循环及双机、双级制冷循环,进行了系统匹配性、市场占有率、成本及其cop值比较.针对双路循环存在的濒繁开停机现象,提出了完善控制方式及采用双稳态电磁阀的变温技术.变温室蒸发器与冷冻室蒸发器串联,其前串联双稳态电磁阀2,并在变温室蒸发器上并联双稳态电磁阀1,据变温室温度设定改变双稳态电磁阀通断实现两个循环支路交替制冷.冷藏室温度控制压缩机启停,变温室温度仅控制双稳态电磁阀通断,实现切换制冷剂流向目的.应用该循环方式及相关措施研制的BCD-188CH直冷电冰箱最大负荷日耗电0.38度,变温情况下耗电在0.35度以下,最低达0.31度.  相似文献   

2.
冷冻室蒸发器采用多层换热片的复合立体结构,在S型制冷盘管壁外侧固定套装翅片,增加冷冻室顶部和低部两个高温区制冷量.将冷冻室按1:1划分出变温室,通过其中温度传感器控制双稳态电磁阀通断实现制冷剂回路切换,将变温室按冷冻、软冷冻、冷藏使用,也可关闭.通过横、竖盘管混排结构的丝管式冷凝器设计,借助制冷系统压缩机、冷凝器、蒸发器负荷匹配及其与毛细管制冷剂流量匹配,通过防凝露管走向及位置设计、蒸发器管道位置及走向布置和回气换热器设计,研制的BCD-186CHS直冷电冰箱最大负荷日耗电0.39度,在变温室为节能状态时耗电在0.35度以下,最低达0.31度.  相似文献   

3.
不同循环冰箱的性能比较   总被引:1,自引:0,他引:1  
本文讨论了两种双蒸发器冰箱的节能效果,一种是将两个蒸发器串联,另一种是将两个蒸发器各自构成独立的循环,两个独立循环可用电磁阀切换,或两循环采用各自的压缩机、冷凝器而构成彼此完全独立的循环.分析和试验表明,在研究的工况下,与单蒸发器冰箱相比,串联蒸发循环可节能20%,而电磁阀控制的交替蒸发循环比串联循环节能12.3%;彼此完全独立的双循环冰箱,与美国现行标准相比节能13.8%.  相似文献   

4.
朱日昭  黄步云 《制冷》1999,18(3):20-24
为了提高电冰箱产品的挡次和技术水准, 合作进行将BCD225 型电冰箱改装成微电脑控制、双稳态电磁阀进行制冷量分配调节、二间室温度独立可调的智能化冰箱。试装完成后,所有系统方面的性能测试均符合现行标准的要求,在实现电冰箱节能、多功能、智能化的道路上前进了一大步, 同时它还缩短了新产品的研制周期。  相似文献   

5.
通过试验研究发现,在使用毛细管作为节流装置的小型制冷系统中使用液路电磁阀,可以防止制冷机组停机时冷凝器中的制冷剂流出,从而抑制冷库温度上升,减小蒸发器进出口温差,降低制冷机组运转率,可以实现10%以上的节能效果。  相似文献   

6.
本文提出了一种实现直冷冰箱变温控制的方法 ,并依据该方法制作了直冷变温冰箱。该冰箱的变温室温度可以在 5℃到 - 18℃之间调节 ,使变温室可以作为冷藏室、冰温室、微冻室和冷冻室使用。变温室作为冷藏室、冷冻室等不同功能间室使用时 ,对直冷变温冰箱的储藏温度和耗电量也进行了测试 ,测试结果表明该方法是可行的  相似文献   

7.
气液两相流流型振荡诱发制冷循环不稳定性的实验研究   总被引:1,自引:0,他引:1  
研究利用变制冷剂流量制冷循环的实验平台结合流动显示方法发现:1)蒸发器出口的制冷剂气液两相流流型存在过热蒸汽流和雾状流两种型式,二者之间存在一个转变过渡区域,此时,两种流型闪动交替出现,回气温度随机性波动;2)膨胀阀出口(即蒸发器入口)的制冷剂气液两相流的流型存在液一气分相流、泡一气分相流两种型式,二者之间也存在一个转变过渡区,此时两种流型交替出现,制冷循环周期性振荡,蒸发温度、回气温度、排气温度等参数周期性波动:且振荡周期随着制冷循环制冷剂流量的增大而缩短.  相似文献   

8.
电冰箱制冷系统优化设计再析   总被引:1,自引:0,他引:1  
电冰箱节能研究是一重要课题,其中制冷系统优化设计是关键环节,已有相关文献对此进行报道,本文据项目研究实际情况,进一步分析了蒸发器和冷凝器的优化设计、提出了软冷冻及变温技术的节能观点及优化设计,再析了制冷系统优化匹配及制冷剂管路走向等节能措施。  相似文献   

9.
《制冷》1994,(2)
珠海市八达电器厂是专门制造制冷器配件和设计新型制冷器具的厂家。该厂生产的专利产品—双稳态电磁阀为国际首创,已被列入国家级重点新产品,并在电冰箱、电冰柜、空调器、热水器的性能和功能提高上起到了突破性的作用。 为扩大生产规模,尽快占领国内外市  相似文献   

10.
宁静红  诸凯  刘圣春  董强 《制冷学报》2018,39(6):32-36+60
本文分析了R290直接接触冷凝(DCC)制冷循环的性能,并与R290常规单级压缩制冷循环的热力性能进行对比,得出:在最佳主循环冷凝温度下,R290直接接触冷凝制冷循环可获得最大性能系数和最低冷凝器热负荷。主循环过冷液体的过冷度增大,最优性能系数降低、最低冷凝器热负荷增加、蒸发器的制冷剂质量流量减少,同时,获得最优性能系数和最低冷凝器热负荷的最佳主循环冷凝温度升高。当蒸发温度为-15~-6℃,R290直接接触冷凝制冷循环相比R290单级压缩制冷循环的性能系数提高了7.5%~14.9%,冷间供冷设备蒸发器的制冷剂质量流量减少了26.5%~36.7%,冷凝器热负荷减少了1.5%~3.7%。结果表明R290直接接触冷凝制冷循环具有很好的发展前景。  相似文献   

11.
In this paper, we present a new method for inserting several triangulated surfaces into an existing tetrahedral mesh generated by the meccano method. The result is a conformal mesh where each inserted surface is approximated by a set of faces of the final tetrahedral mesh. First, the tetrahedral mesh is refined around the inserted surfaces to capture their geometric features. Second, each immersed surface is approximated by a set of faces from the tetrahedral mesh. Third, following a novel approach, the nodes of the approximated surfaces are mapped to the corresponding immersed surface. Fourth, we untangle and smooth the mesh by optimizing a regularized shape distortion measure for tetrahedral elements in which we move all the nodes of the mesh, restricting the movement of the edge and surface nodes along the corresponding entity they belong to. The refining process allows approximating the immersed surface for any initial meccano tetrahedral mesh. Moreover, the proposed projection method avoids computational expensive geometric projections. Finally, the applied simultaneous untangling and smoothing process delivers a high‐quality mesh and ensures that the immersed surfaces are interpolated. Several examples are presented to assess the properties of the proposed method.  相似文献   

12.
13.
A four-ball tester was used to evaluate the anti-wear performance of three kinds of organomolybdemun compounds in the engine oils, i. e., molybdenum dialkyldithiophosphate (MoDDP), molybdenum dialkyldithiocarbamate ( MoDTC), and sulphur and phosphorus freeorganomolybdeum (Molybdate). The results indicate that a low concentration of MoDDP doesn' t improve the anti-wear properties of the commercial engine oils, but a high concentration of MoDDP can obviously improve the anti-wear properties and the load-carrying capacity of the engine oils. MoDTC doesn' t improve the antiwear properties of the engine oils, but worsens the anti-wear properties of the oils. Signifi can timprove ment of frictional and wear characteristics is obtained with Molybdate added in the commercial engine oils and the formulated oils.  相似文献   

14.
Standards are the basis for production enterprises to organize production, ex-factory inspection, trade (delivery) and technical exchanges, product certification, quality arbitration and supervision.……  相似文献   

15.
A flow calorimeter for enthalpy increment measurements on condensed gases is presented. A better knowledge of the properties of the liquefied natural gas is needed, and therefore a liquid loop has been designed for our flow calorimeter. The fluid loop in the calorimeter is designed in order to avoid the two-phase region, since two phases would give compositional disturbances in the measurements. The avoidance of the two-phase region is made possible by increasing the pressure of the test fluid after the measurement section, then heating the fluid at super-critical pressure past the critical point. Finally, the fluid is throttled to the low-pressure gas state at the inlet condition of the compressor that circulates the fluid. To perform the pressure increase, a new cryogenic pump has been designed. To evaluate the new equipment, measurements were taken on liquid ethane over the temperature range 146–256 K at pressure between 0.9 and 5.1 MPa.  相似文献   

16.
On November 30, 2007, the China Association for Standardization (CAS) held a press conference at Beijing Diaoyutai State Guest House. Leaders from the China Household Electric Appliance Research Institute, the China Household Electric Appliance Association, and the China Consumers' Association attended and made speeches.……  相似文献   

17.
We associate a variety of innovations with the term "Industry 4.0". The pioneer of many 4.0 modifications forms the basisfor the trend towards the integrated di...  相似文献   

18.
In the present study a high‐boron high speed steel (HSS) roll material was designed. Many expensive alloy elements have been substituted by cheap boron alloy, and high‐boron high speed steel roll has been manufactured by centrifugal casting method. The microstructures, mechanical properties and wear resistance of centrifugal casting high‐boron high speed steel roll have been investigated by optical microscopy (OM), scanning electron microscopy (SEM), and X‐ray diffraction (XRD) analysis, hardness test, impact test and wear test. The results indicated that the solidification microstructures of high‐boron high speed steel roll consisted of M2(B,C), (W,Mo)2(B,C), M3(B,C), M23(B,C)6 type borocarbides and martensite, a small amount of retained austenite. Borocarbides were continuously distributed over the grain boundary. After quenching from 1050 °C, local broken network appeared in partial borocarbides, and fine secondary borocarbide precipitated from the matrix. After tempering from 525 °C, the amount of precipitated borocarbide increased significantly. After heat treatment, the hardness of high‐boron high speed steel roll excelled 60 HRC, and its impact toughness excelled 8.0 J/cm2. The single groove steel rolling amount of high‐boron high speed steel rolls increases by 500% than that of bainite cast iron roll, when the rolls are used in K1 mill housing of bar mill.  相似文献   

19.
Zusammenfassung Bei der Gestaltung von Ernteprozessen — beispielsweise des Prozesses Mähdrusch, Körnertransport und -abnahme — als transportverbundene Fließarbeitsverfahren mit mindestens zwei verschiedenen Arbeitsmitteln gibt es einen großen Optimierungsspielraum. Solche Prozesse sind mehrstufige Bedienungsprozesse mit gemischter Anordnung der Bedienungseinrichtungen. Außerdem besitzen sie stark ausgeprägte räumliche Aspekte. Es wird vor allem gezeigt, welche Merkmale solcher Prozesse in Simulationsmodellen abgebildet sein müssen, welche Zielgrößen in Abhängigkeit von welchen Einflußgrößen unter Berücksichtigung welcher Prozeßbedingungen ermittelt werden sollten und wie der Bewertungsprozeß zur Ermittlung der gewünschten Informationen gestaltet werden muß.  相似文献   

20.
The end of 2007, over 200 unit products of more than 80 Chinese firms have passed the quality grade certification for liquor products. These products involve distilled spirits, beer, wine, yellow wine, fruit syrup wine and others, and cover over 80% of the national top-branded liquor products.……  相似文献   

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