Abstract
In the article a problem of performance omprovemenr of the transport refrigerating system with eutectic plate evaporator is analysed. Due to weight limitations the system is equipped with single-stage compressor, whih operates at very low evaporation temperatures and high compression ratios. For such conditions the economizer technology offers substantial performance improvement.A transport refrigerating system with eutectic plate evaporator and economizer with intermediate heat exchanger is investigated and compared to baseline eutectic system without economizer. Different configurations of an economizer system wwith additional suction liquid heat exchangers and with/without additional liquid injection through the discharge temperature control valve are analysed.Comparing to the baseline system without economizer, the pull-down energy consumption decreased by more than 20% at 30 oC ambient temperature. The proposed custom-made intermediate heat exchanger allows efficiency improvement without significant cost increase.DOI: http://dx.doi.org/10.5755/j01.mech.23.1.14319
Highlights
The gas refrigerant injection is successfully implemented in refrigerating systems, using the scroll compressors with an additional vapour injection connection
The economizer technology traditionally is used with vapour-injected scroll compressors
If vapour-injected scroll compressors of required capacity are not available, the liquid-injected scroll compressors can be used in a system with economizer and still offer performance improvement
Summary
The gas refrigerant injection is successfully implemented in refrigerating systems, using the scroll compressors with an additional vapour injection connection. According to the research Winandy and Lebrun 2002 [1], Wang et al 2009 [2] under the large compression ratio conditions the gas refrigerant injection increase the efficiency and capacity of the system, and improves system’s reliability by decreasing the discharge temperature of compressor. The objective of this research is the development of high efficiency, low-temperature transport refrigerating system with eutectic plate evaporator. These systems operate at specific operating conditions, such as: i) strict weight limitations, ii) single stage refrigerating system and iii) very low evaporation temperature and high compression ratio. The tests must determine the operating parameters of new systems, such as pull-down time and energy consumption
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