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Sabroe CP Optimiser Automatic device for balancing R717 condensing pressure against compressor efficiency Many refrigeration systems that use R717 (ammonia) as refrigerant and feature an evaporative condenser are operated using a fixed set point to maintain a constant condensing pressure This is rarely ideal, as the energy consumption of the compressors typically increases by 3 percent for every degree Celsius the condensing pressure rises Shaft power consumption is directly influenced by condensing pressure This impacts overall operating costs and plant efficiency Reducing condensing pressure improves compressor efficiency, but doing so also requires energy Maximum overall efficiency stems from the best possible balance between compressor energy consumption and the energy required to reduce condensing pressure The figure below indicates the sum total displacement of the energy consumption, if the condensing pressure deviates from optimum The CP Optimiser automatically calculates this energy balance, taking into account changing loads and conditions This paves the way to considerable savings on energy bills, which means the CP Optimiser normally pays for itself within a matter of months Increased power consumption [%] 10 8 6 4 2 0 Optimum point Features Benefits Automatic operation based on inputs from just two sensors – temperature and humidity No time-consuming programming or complicated technical setup required No special requirements for integration into new or existing R717-based refrigeration setups Substantial reduction in compressor energy consumption, resulting in lower operating costs Easy to commission and operate, and helps eliminate human error Straightforward, inexpensive way to boost operating efficiency and reduce running costs The average savings in energy consumption amount to 8-10% Deviation from optimum condensing temperature [°C] -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 Output signal can be connected directly to PLCs and frequency converters Easy to integrate with modern monitoring and control systems to ensure maximum efficiency No manual intervention or special operator skills required Virtually no maintenance, calibration or attention necessary after commissioning 80PDF Image | Sabroe Products 2022
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