COMPRESSORS PETplanet Insider Vol. 24 No. 12/23 www.petpla.net 14 Advancements in heat recovery, refrigerant dryers, and intelligent network control Maximising efficiency Complementing their PET compressor range, Boge is launching three new product lines. Using its heat recovery technology, 94% of energy can be reclaimed, according to the company, whilst their sustainable refrigerant dryers ensure constant dew points. Finally, Boge’s Airtelligence Provis 3 offers intelligent network control. Heat recovery regenerates 94% of the energy used Heat recovery means reusing the energy used to generate the compressed air. Instead of being lost as undirected ambient heat, the energy generated is used to heat storage and operating areas or for heating water or oils. Concrete application areas include the treatment of drinking water, service water, heating water and process water. The latter is used for industrial washing processes, for example in recycling companies to clean plastic and synthetic materials as well as in laundrettes. Components can be used to recover heat in both oil-injection cooled and oil-free screw compressors. For users, heat recovery is a profitable model: Up to 94% of the energy used can be recovered. At the same time, the energy for cooling processes within the compressor is reduced as the heat generated is conducted away and used elsewhere. The investment in heat recovery components pays for itself within a few months, depending on the application, says Boge. The option of heat recovery is included in all new compressors of the company as standard. Older systems – including those of other manufacturers – can be retrofitted within a day. Refrigerant dryers for sustainable, reliable operations No compressor without a refrigerant dryer – dry compressed air is required for almost any situation. In addition to the existing DS-2 series, Boge has launched a new range of products. All the models in the new DT series ensure a constant dew point of 3 °C at a free air delivery of between 0.4 and 14m³/min. With this strategy, the compressed air system is claimed to ensure maximum delivery capability for its customers. As with the All models are claimed to be lowconsumption. As the Boge CCD ten condensate drain used in the dryer has electronic level adjustment, any condensate that might form can be drained off without any pressure losses once a defined level has been reached. The DT 52 to DT 140 models offer additional savings potential: if the dew point is reached in partial-load operation, the control unit automatically switches off the compressor. The condensate in the heat exchanger then cools the compressed air until the dew point once again reaches the target value. Only once this happens does the cooling compressor come back on. The refrigerant dryer’s control system permits continuous monitoring of the pressure and temperature thanks to a series of sensors. Unlike with the DS-2 series where a pressure switch disconnects the system in case of an emergency, in these new devices, the sensors take over the job. The pressure dew point can be quickly checked with the help of the LED status light. The new refrigerant dryers also come with a Modbus RTU/ RS 485 interface as standard, allowCOMPRESSORS DS-2 series, the DT series refrigerant dryers all come with an “all-in-one” aluminium heat exchanger operated in a reverse flow process and containing a proven air/air heat exchanger, evaporator and condensate drain. Boge says that both models use the environmentally friendly and futureproof R 513 A refrigerant, with low global warming potential, as standard, making all the models compliant with Regulation EU 517/2014 on fluorinated greenhouse gases. The refrigerant circuit is hermetically sealed, rendering a leakage test by certified refrigeration engineer unnecessary. The hot gas/bypass valve present in all models keeps the pressure dew point at a constant 3 °C, even in changing environmental conditions. As hot air is injected below a specific temperature, there is no danger of ice forming in the evaporator. And, in addition, the refrigerant dryer’s condensers are amply dimensioned, delivering reliable operation even for compressed air at an inlet temperature of 70 °C. The large fan is mounted directly on the condenser and is intended to ensure maximum cooling air flow, which in turn has a positive effect on the pressure dew point. As a result, the refrigerant dryer is robust and continues to operate even under challenging circumstances. Refrigerant dryers DT series
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