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复叠制冷机组系统的参数介绍

作者:admin 来源:本站 发布时间:2018-3-23 15:53:57

复叠式制冷机组通常由两个部分(也可由三个部分) 组成,分别称为高温部分及低温部分。高温部分使用中温制冷剂,低温部分使用低温制冷剂,而每一部分都是一个完整的单级或双级压缩制冷系统。
A cascade refrigeration unit is usually composed of two parts, which are also composed of three parts, which are called high temperature and low temperature parts. The high temperature part uses the medium temperature refrigerant, the low temperature part uses the low temperature refrigerant, and each part is a complete single or two stage compression refrigeration system.
高温部分系统中制冷剂的蒸发是用来使低温部分系统中制冷剂冷凝,而只有低温部分系统的制冷剂在蒸发时才制取冷量。高温部分和低温部分用一个冷凝蒸发器联系起来,它既是高温部分的蒸发器,又是低温部分的冷凝器。

The evaporation of refrigerant in some high temperature systems is used to cool the refrigerant in cryogenic system. Only when the refrigerant of cryogenic part of the system is evaporated, can it produce cold. The high temperature part and the low temperature part are connected by a condensing evaporator. It is both the evaporator of the high temperature part and the condenser of the low temperature part.

山东制冷机组

一、中间温度的确定
First, the determination of the intermediate temperature
复叠式制冷循环中中间温度的确定应根据制冷系数最大或各个压缩机压力比大致相等的原则。前者对能量利用最经济,后者对压缩机气缸工作容积的利用率较高(即输气系数较大) 。由于中间温度在一定范围内变动时对制泠系数影响并不大,故按各级压力比大致相等的原则来确定中间温度似乎更为合理。
The determination of the intermediate temperature in the cascade refrigeration cycle should be based on the principle that the coefficient of the refrigeration is maximum or the pressure ratio of each compressor is roughly equal. The former is the most economical use of energy, and the latter has a high utilization ratio of the working volume of the compressor cylinder (that is, the gas transmission coefficient is larger). Because the influence of intermediate temperature in a certain range is not large, it is more reasonable to determine the intermediate temperature according to the principle of approximately equal pressure ratio at all levels.
二、膨胀容器
Two. Expansion container
复叠机组停止运转时,由于系统内的温度升高到了环境温度,低温制冷剂全部气化成过热蒸汽,并且将高于规定的最大工作压力,这种情况是不允许的。因此要在系统中接入一个膨胀容器,以便在停机后大部分的制冷剂蒸汽进入膨胀容器中,膨胀容器可以接到吸气管上,也可以接到排气管上,接到吸气管上时,膨胀容器所需要的容积较小,因而比较合理 。
When the cascade unit stops operation, because the temperature inside the system rises to the ambient temperature, the low temperature refrigerant is all superheated into a superheated steam and will be higher than the maximum working pressure specified. This situation is not allowed. Therefore in the system to access an expansion vessel, in order to stop after most of the refrigerant vapor enters the expansion tank, expansion vessel can receive suction tube, may be connected to the exhaust pipe and received suction pipe when the expansion volume of smaller vessels required, thus more reasonable.
膨胀容器的容积可按如下方法计算:
The volume of an expansive vessel can be calculated as follows:
V p = ( Gd*vp - V d)*vd/(vd – vp)
V P = (Gd*vp - V d) *vd/ (VD – VP)
式中: V d 为不计膨胀容器容积时,低温部分的制冷系统总容积(m3) ; vp 为设计温度、设计压力下低温系统制冷剂过热气体比容(m3/ kg) ; v d 为设计温度、吸气压力下低温系统制冷剂过热气体比容(m3/ kg) ; Gd 为不计膨胀容器容积时,低温系统制冷剂充注量(kg) 。
Type: V D excluding container volume expansion, the total volume of refrigeration system in the low temperature part (M3); VP is the cryogenic system of refrigerant gas volume design temperature, design pressure (m3/ kg); V D for low temperature system of refrigerant gas volume under the design temperature, suction pressure (m3/ kg); Gd no expansion of container volume, low temperature refrigerant charge (kg).