System Controls

prevalent than either two-speed fans or pony motors. Using variable-speed drives on cooling-tower fans offers two distinct benefits. First, the tower- water-temperature control is extremely good. Second, the fan power varies with the cube of the speed, so there is great potential for energy savings. Variable-speed drives also allow the fan speed to be changed without fear of gear box or motor wear. They may also offer acoustical advantages by significantly lowering sound power at reduced speeds. Variable-speed drives are also applicable to existing chilled-water systems.

Chiller–tower energy balance

The subject of condenser-water temperature control has been studied by a number of people. In recent years, Braun and Didderich38; Hydeman, Gillespie, and Kammerud39; and Schwedler40 have all independently noted that balancing chiller and cooling-tower energy is important. Hydeman, et al., showed that at various loads and ambient conditions, the optimal condenser- water temperature for a specific chilled-water system depends on both chiller load and ambient conditions (see Figure 54). All the studies showed that during many points of operation, the optimal condition is not the lowest water temperature the cooling tower can produce. It is important for the system designer and operator to examine the use of system-level controls to set the tower-sump temperature setpoint to reduce the sum of chiller-plus- tower energy. This optimal chiller-tower control can be automated by a chiller-plant management system.

Figure 54. Chiller-tower energy consumption

1,650 tons [5,803 kw] 65°F [18.3°C] wet bulb

1,160 tons [4,080 kw] 59°F [15°C] wet bulb

730 tons [2,567 kw] 54°F [12.2°C] wet bulb

Coldest condenser water that the tower can produce at this load and wet-bulb temperature

Highest cooling capacity available at this condenser- water temperature

Figure 54 from Hydeman, et al., used with permission.

SYS-APM001-EN

Chiller System Design and Control

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Trane SYS-APM001-EN manual Chiller-tower energy balance, Chiller-tower energy consumption
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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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