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A malfunctioning boiler at a local distillery puts hundreds of thousands of dollars of product at risk.
A distillery gives Sebastian a call. They are at a critical part of completing the distillation process and require that a certain volume of steam be available for the size of the batch of the spirits being distilled. For some reason, the boiler keeps shutting down with every effort that the distiller makes to complete the process.
They also rely on the high-quality steam produced by the boiler to ensure that the taste and flavor of the spirits maintain a specific standard. They have a large order that needs to be fulfilled and are running out of time.
Sebastian suspects that there may be an issue with pressure which could cause his customer to lose money on this order.
Pressure control is required in a variety of HVAC applications to either maintain the system at a given pressure setpoint or to prevent disasters from occurring when the system pressure moves outside of its design limits.
Without pressure control, a ventilation system, for instance, may gain too much pressure when dampers are closed causing a decrease in efficiency.
Sebastian has some options for addressing the issue:
Proportional, Integral, Derivative (PID) control is a closed loop mathematical function.
How does it work?
An example of how a nano PLC can implement PID control is in its ability to control the position of a damper based on temperature feedback:
D = Damper
DF = Diffuser
SPS = Static Pressure Sensor
High pressure control is used to keep components from failing and to prevent the HVAC system from releasing fluids, such as hot water in a boiler, into the surrounding environment. By monitoring a pressure switch or transducer, the nano PLC is able to monitor whether the upper pressure threshold has been surpassed. If it has, the nano PLC can then shut down the system and warn the proper personnel.
Like high pressure control, low pressure control works by having a PLC monitor a pressure switch or pressure transducer to check if the pressure in the system is below a desired threshold. Low pressure in an HVAC system can indicate issues such as low, or leaking coolant in an AC unit. Low pressure control can also be used prevent mechanical failures - for example, shutting off a compressor in an AC unit when the pressure is too low to prevent the system from freezing.
The image depicts how a user can quickly integrate an analog or digital pressure sensor with the easyE4 nano-PLC. The programmer is then able to easily write code to compare the sensor feedback against a pressure threshold setpoint. When the feedback surpasses or does not meet certain values, the programmer is then able to turn off the easyE4’s outputs to shut down the system.
Select it to learn more about how it works.
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