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Technicians and maintenance staff can remotely change control parameters and be alerted timeously. To facilitate this, flow and energy meters were installed on the main fluid lines and main components to monitor consumption and efficiency.
Once the design was completed, the project was executed in two phases. The high-stage and main large high-bay insulated panel structure was installed first, followed shortly by the low-stage CO2 system. The project has resulted in an average saving of over 30 % on the client’ s refrigeration energy consumption, alongside an increase in storage volume of over 150 %.( Refer to table 1)
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Graphics supplied by Energy Partners |
Old Cold Store
New Cold Store
Floor Area m ² 4 822 2 950-39 %
Difference
Volume m ³ 15 375 39 600 + 158 %
Monthly Energy Consumption
MWh 122 80-34 %
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The secondary glycol circuit pump was also installed with a variable speed drive to modulate the flow capacity according to demand and thereby maintain energy efficiency. A standby pump was also installed for redundancy. The reticulation of the secondary circuit was designed and installed as a reverse return system for effective distribution irrespective of the differences in the cooler distances. As |
part of improving the lifetime of the system components, the secondary circuit was pressurised to minimise corrosion of the components in the system and no open expansion tank was used.
For the low-stage CO2 system, two piston compressors were also installed with variable speed drives for load modulation. The condensing temperature control is achieved by modulating the flow rate of glycol through
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a CO2 glycol plate heat exchanger. The low temperature CO2 system is a directexpansion system with desuperheater.
Crucial to the operation is visibility of the system and measurement of performance for continued efficient operation after commissioning. A monitoring system was installed, allowing key performance indicators of the plant to be monitored and reported remotely.
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Table 1.
Following the commissioning phase, Energy Partners ensures continuous performance monitoring and reporting of the system. This comprehensive approach encompasses performance metrics such as the efficiency, or Coefficient of Performance( COP), utilisation rates and system stability, all aimed at minimising the total lifecycle
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