Improving the efficiency of railway conditioners in actual climatic conditions of operation
Mykola Radchenko, Andrey M. Radchenko, A. P. Tsoy, Dariusz Mikielewicz, С. А. Кантор, Веніамін Сергійович Ткаченко
Abstract
The operation efficiency of air conditioning systems (ACS) depends on a duration of their operation period and loadings of their refrigeration machines of definite installed (design) refrigeration capacity. The longer duration of ACS operation, the larger refrigeration capacity production according to current cooling needs during operation period. So as the operation efficiency of railway ACS and their refrigeration machines depends on a duration of their operation on the route line it can be estimated by a refrigeration capacity production for the operation period considered.The method to determine the rational design heat load on railway air conditioning system matching the changeable climatic conditions and providing a maximum refrigeration capacity production for the operation period was developed. One of the most attractive reserves of enhancing the efficiency of air conditioning systems consists in efficient operation of their air coolers (refrigerant evaporators), intended to match varying thermal loads in response to current changeable climatic conditions.A proposed concept of enhancing heat efficiency of air coolers with boiling refrigerants inside channels is intended to solve the problem of uneven external thermal load distribution between refrigerant coils and changeable current thermal loads on air coolers by over filling all the coils through liquid refrigerant jet pump (injector) recirculation that provides excluding the final stage of refrigerant evaporation with low intensity of heat transfer to superheated vapors.The principle of over filling all the refrigerant coils by liquid refrigerant injector recirculation is very useful for air coolers of railway air conditioners influenced by varying heat loads during operation at current changeable climatic conditions on the routes.