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7th European Thermal-Sciences Conference (Eurotherm2016) IOP Publishing Journal of Physics: Conference Series 745 (2016) 032157 doi:10.1088/1742-6596/745/3/032157 two sections each. In AC mode (left) the air inlet part faces the saturation temperature of the interior heat exchanger operating as an evaporator at compressor suction level, while the second part (air outlet part) is at the ejector suction pressure level. The ejector downstream of the exterior heat exchanger is bypassed in AC mode. In heat pump mode, the air inlet part of the interior heat exchanger can be applied for dehumidifying the air on demand. The air inlet section of the exterior heat exchanger is at the saturation temperature level corresponding to the compressor suction pressure while the air outlet part can be further cooled by the refrigerant flow circulated through the suction port of the ejector at lower evaporation temperatures. Cooling mode: Heating mode Figure 7. Circuit of a CO2 HVAC unit for trains with ejector layout in the AC mode (left) and HP mode (right). HVAC systems for public transport vehicles have to refurbished, potentially applying NWFs. Flammable alternatives are not applicable in this sector due to high risks related to accidents and the high number of people inside the passenger compartments. CO2 systems will play an important role in this sector towards 2020. 2.7 Industrial refrigeration Systems originally designed for HCFC 22 are still widely applied in industrial refrigeration applications across the globe. Hafner [11] reports from successful transformations of R22 units to CO2 technology for applications within the fishery sector. As an example, a stern trawler got a new CO2 deep freezing plant. The new CO2 refrigeration system reduced the deep-freezing time by 25%. It required 20% less space on-board of the fishing vessel and has excellent part load performance (50% reduction in energy use). The CO2 cooled plate freezers achieve better food quality, since the de-icing can be performed without boiling of the fish surface. This is reflected in the price of the fish the owner can achieve from the customers demanding now deliveries from this particularly trawler. The service and maintenance of the new systems is reported by the ship owner to be better and easier. Ejectors will play an important role in these kind of units, circulating the liquid refrigerant through the plate freezers, with a certain circulation rate. Another vessel equipped by the same vendor with a CO2 refrigerated sea water (RSW) unit was in operation around the Canarian Islands. Now this fishing vessel is in operation outside Mauretania, i.e. close to the equator, without any challenges related to the CO2 refrigeration equipment. 11PDF Image | R744 ejector technology
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