在普通制冷范围内，只有单级和双级压缩之分。单级压缩指经过一次压缩从蒸发压力达到冷凝压力，通常在制冷系统中只有一台制冷压缩机或几台制冷压缩机并联使用。 确定系统压缩级数的主要根据是压力比值。选用活塞式氨压缩机时，当冷凝压力与蒸发压力的比值小于或等于8时，应采用单级压缩。氟系统当冷凝压力与蒸发压力的比值小于或等于10时，采用单级压缩。
... single scattering单散射 single stage compression单级压缩 single stage compressor单级压缩机 ...
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... single stage type 单罐连续发酵型 single-press compression 单级压缩 single-press exchanger 单程热交换器 ...
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... Single-stage centrifugal pump 单级离心泵 Single-stage compression 单级压缩 Single-stage cyclone 单级旋风除尘器 ...
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单级压缩机 single stage compressor ; single-step compressor ; stage compressor ; step compressor
单级压缩制冷系统 [制冷] single-stage compression refrigeration system ; single stage compressive refrigerating system
单级离心压缩机 stage radial compressor ; Single-stage radial compressor
双级单作用压缩机 two-stage single-acting compressor ; acting compressor
单级式空气压缩机 stage air compressor ; single-stage air compressor
活塞式单级制冷压缩机 Single-stage reciprocating refrigerant compressors ; stage reciprocating refrigerant compressors
单级空气压缩机 single stage air compressor
单级离心式压缩机 single-stage centrifugal compressor
单机双级制冷压缩机 compound refrigerating compressor
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为此，先确定供油系统的改装方案、后对改装零件进行设计和计算，最终经由R175单缸柴油机制得单级压缩空气发动机。
Firstly a project is presented how to refit a R175 diesel. Secondly the system design calculations are made. Finally we make a single stage compressed air engine.
但普通单级空气源热泵热水器在低温环境下运行中存在压缩比过大、制热量不足和制热效率太低等问题。
But there are some shortage of ordinary single-stage heat pump in low-temperature environment, such as high compression ratio, devoid heating power and low efficiency.
研究了适用于斜流式压缩机的一体化设计技术，并基于一维设计方法简述了单级斜流式压缩机的设计。
The 1 -D and 3 -D performance prediction shows that the feasibility of applying integrative design technology to design mixed-flow compressor.
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