Primary System Components

For more information about chillers, Trane Air Conditioning Clinics are available for centrifugal (TRG-TRC010- EN), absorption (TRG-TRC011-EN) and helical-rotary (TRG-TRC012-EN) chiller types.

In addition to monitoring data, it is vital that the chiller controls alert operators to possible problems. Diagnostic messages are necessary for the operator to respond to safety issues and data points that are outside normal operating ranges. While communicating these diagnostic messages is a requirement, some chiller controls include factory-installed programming that responds to the issue causing the diagnostic messages. For example, when the chilled-water temperature nears freezing, the chiller sends a diagnostic message and adapts its operation by reducing the compressor capacity, raising the chilled-water temperature to a safer condition.

Finally, the chiller controls should communicate with a system-level controller. There are many system aspects that are outside the chiller’s direct control, such as condenser-water temperature and the amount of fluid flowing through the evaporator and condenser. To minimize the system energy costs, the system controls must coordinate chiller, pump, cooling- tower, and terminal-unit controls. This can only be done if adequate information is communicated from each system component to the system- level controls. System-level control is discussed in detail in “System Controls” beginning on page 87.

Centrifugal chiller capacity control

The capacity of a centrifugal chiller can be modulated using inlet guide vanes (IGV) or a combination of IGV and a variable-speed drive (adjustable- frequency drive, AFD)(Figure 16). Variable-speed drives are widely used with fans and pumps, and as a result of the advancement of microprocessor-based controls for chillers, they are being applied to centrifugal water chillers.

Figure 16. Centrifugal chiller with AFD

 

 

Compressor

 

Inlet Guide Vanes

 

 

 

 

 

Condenser

Adjustable

 

 

 

 

 

 

Frequency

 

 

 

Drive

Evaporator

ASHRAE 90.1 requires a chiller to meet both full and part-load efficiency requirements. Using an AFD with a centrifugal chiller degrades the chiller’s full-load efficiency. This causes an increase in electricity demand or real-time pricing charges. At the time of peak cooling, such charges can be ten (or more) times the non-peak charges. In return, an AFD can offer energy savings

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Chiller System Design and Control

SYS-APM001-EN

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Trane SYS-APM001-EN manual Centrifugal chiller capacity control, Centrifugal chiller with AFD
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SYS-APM001-EN specifications

The Trane SYS-APM001-EN is an advanced control system designed for HVAC (Heating, Ventilation, and Air Conditioning) applications, specifically tailored to enhance energy efficiency and system performance. This comprehensive solution integrates cutting-edge technologies to optimize climate control in commercial and industrial environments.

One of the main features of the SYS-APM001-EN is its intuitive user interface. The system is equipped with a large, easy-to-read display that provides real-time data on system performance, energy usage, and environmental conditions. This user-friendly interface makes it simple for operators to monitor and adjust settings, ensuring optimal comfort levels and efficient energy consumption.

Another key characteristic of the SYS-APM001-EN is its advanced data analytics capabilities. The system collects and analyzes data from various sensors throughout the building, providing insights into occupancy patterns, equipment performance, and energy consumption trends. This data-driven approach allows facility managers to make informed decisions about system adjustments, predictive maintenance, and energy savings.

The SYS-APM001-EN also boasts robust integration capabilities. It can seamlessly connect with a variety of building management systems (BMS) and other third-party devices. This interoperability enables a cohesive operational ecosystem where HVAC systems can communicate and cooperate with lighting, security, and fire safety systems, enhancing overall building efficiency.

Energy efficiency is a hallmark of the SYS-APM001-EN, as it implements sophisticated algorithms to optimize system operation. These algorithms adjust equipment performance in real-time based on current conditions, thereby reducing energy waste and lowering operational costs. The system is designed to support multiple energy-saving strategies, including demand-controlled ventilation and optimal start/stop scheduling.

Additionally, the SYS-APM001-EN is built with scalability in mind, accommodating facilities of various sizes and configurations. Whether it’s a small office building or a large industrial complex, the system can be tailored to meet specific needs, ensuring that HVAC performance aligns with operational goals.

In conclusion, the Trane SYS-APM001-EN is an innovative HVAC control solution that emphasizes user experience, data-driven decision-making, and energy efficiency. With its advanced features and technologies, it is an essential tool for optimizing building performance and enhancing occupant comfort while reducing environmental impact.
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