TechCold International (TCI)

Industrial Control


Operational Philosophy: The TechCold International (TCI) System is a suite of integrated software, operating on a micro-processor base to enhance the operation of Industrial and Commercial refrigeration systems. To our knowledge, TCI is the only system that will integrate seamlessly with most existing refrigeration control systems (usually Programmable Logic Controller (PLC) driven). As seen in Figure-1 below, TCI is of a Client – Server configuration with the server being the industrial processor and the clients being the graphic displays for operator interface. Although TCI can accommodate as many customized HMI screens as necessary, the main displays are common thus making the system far less complex to configure than a standard PLC-only refrigeration control system.


TCI does not replace the PLC. PLCs are utilized for what they do best - quick control and housekeeping chores (interlocks). But when it comes to the execution of complex mathematical routines the micro-processor dominates. By marrying the two, the end user has the best of both worlds. Instead of requiring additional input/output (I/O) with its associated hardware TCI uses the existing infra-structure. It can communicate with virtually any PLC-based system by means of a single Ethernet or equivalent network connection.

There is no need for the finer control philosophies to be programmed again and again within different plant settings. By using a micro-processor based language the same program can be used to control a wide array of refrigeration systems.

If no PLC (or other) controls infrastructure exists, there are often various approaches that can be pursued depending on the client’s needs. TechCold has the experience to offer the most economical and reliable solutions regardless of current facility infrastructures.

Overall Methodology

TCI uses a high level object oriented computer language for better operation. This allows the system to:

  • Model and operate each component (compressor, evaporator & condenser) separately, yet use the same code.
  • Interface with all other components such that pressure, temperature resets, and other activities in one component can be easily requested from another.
  • Model in real time the activity of the systems (mass flow and energy transfers) using real data (pressures, temperatures and electrical usage). This allows proactive maintenance and indications of potential equipment failures as well as achieving better efficiencies.

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