[INQ. NO. 1607M11] Boosung Engineering has designed a refrigerant system and heat exchanger in order to increase the maximum hot blast temperature up to 125°C and also designed/realized a waste heat recovery cycle and independent hot blast system, applied to 125°C refrigerant (R22, R407c) and four cycles. Their design and development include 125°C evaporator and condenser as well as a pressure backup and control system to prevent high pressure above 32kgf/cm2.
Boosung Engineering has developed an optimized compressor and expansion valve in addition to multi-step control and proportional control technologies depending on inlet-air temperatures. The newly developed automatic control system can save energy by 40% compared to a regular electric heater (95kWh capacity).
Boosung Engineering’s automatic distribution control technology can control hot blast according to inlet-air temperatures. Furthermore, they have optimized a heat pump and auxiliary heater distribution control and improved the range of temperatures control and accuracy.
Also, their air volume control technology significantly enhances accuracy of air volume measurements across the range of temperatures. Air volume is controlled based on the average air volume measurement, taking into account air volume, wind velocity, temperatures, and specific gravity of air. Boosung Engineering has tested a 125°C waste heat recovery hot-air drying unit and established a measurement platform (supported by KTL).
Energy saving has been tested across the range of the highest heat blast temperatures and measurement platform has been designed. Boosung Engineering has established measuring systems for waste heat recovery rates, auxiliary heater operation rates, and power consumption. The basic performance test and environmental test for the 125°C waste heat recovery hot-air drying unit have been done and assessed (KTL) as well.
According to regular printing processes, eight or nine-color printing is applied to gravure while 4-color printing is applied to dry laminate printing, and the final drying process is applied to both. In this case, 10 units are needed for one production line of gravure and five units for dry laminate printing. Each dryer can control temperatures, air volume, and cooling cycle automatically. For gravure 10 units can be controlled in an integrated manner for batch operation of one production line.
In addition, a duct for exhaust gas, containing organic solvent, and a dust collector has been developed. Supplying heat blast optimized for the site by controlling temperatures and air volume could save energy by 70% in case of 200M/MIN gravure printing. ROI (return on investment) is estimated at 1.6 years, which proves high energy-saving effects.
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