Advanced Compound Air Conditioning System with Water-Air Cycle for Railway Transport
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AIR CONDITIONING AND LIFE-SUPPORT SYSTEMS ADVANCED COMPOUND AIR CONDITIONING SYSTEM WITH WATER-AIR CYCLE FOR RAILWAY TRANSPORT A. A. Zharov and S. A. Garanov
UDC 621.59
Different designs of air conditioning systems for railway transport with the use of only environmentally safe natural working substances (air and water) are investigated relative to energy efficiency in the case of not only arid but also humid climates. A compound design of an air conditioning system consisting of an expander in front of which a humidifier is additionally mounded, with the water in the humidifier being fed from the supply tank of the railway coach, is proposed. Calculations demonstrate that the maximally allowable pressure behind the expander as well as the temperature difference in the heat exchanger may be increased through humidification of the auxiliary flow in front of the expander. In turn, this makes it possible to reduce the power consumption and overall dimensions of the air conditioning system by decreasing the required surface area of the regenerative heat exchanger. Keywords: air conditioning, energy efficiency, ecological cleanliness, indirect evaporative cooling, water-air cycle.
The conversion of air conditioning systems to the use of ecologically safe coolants and the search for energy-efficient working cycles of air conditioning systems are critical problems today. A solution of these problems is especially important for transportation-based, in particular, railway air conditioning systems. This is due to the constantly growing requirements to ensure the travelling comfort of passengers [1]. Investigations focused on the development and improvement of air conditioning systems equipped with evaporative water-air cycles that take into account the existing storage containers with water in the passenger coaches have shown promise. Evaporative water-air conditioning systems along with air systems that make efficient use of the water condensate formed in the course of operation of the air conditioning system have been used for many years in countries with arid climate. However, the development of efficient air conditioning systems with evaporative water-air cycles for both arid climate and humid climate as always remains a critical need. The objective of the present study is to develop the design of an air conditioning system for railway transport with the use exclusively of ecologically safe natural working substances (air and water) based on ensuring the energy efficiency of the system not only in arid but also in humid climates. An air conditioning system with simple single-stage, steam-compression refrigeration cycle functioning with the now outdated R22 coolant with a high level of energy efficiency was adopted as a model for comparison relative to energy efficiency. Bauman Moscow State Technical University, Russia; e-mail: [email protected], [email protected]. Translated from Khimicheskoe i Neftegazovoe Mashinostroenie, Vol. 56, No. 5, pp. 40–45, May, 2020. 0009-2355/20/0506–0403
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Springer Science+Business
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