Chilled-Water System Variations

Sidestream system control

The flexibility of sidestream applications is increased by the fact that the devices are used to pre-cool return water, not to produce the system chilled- water temperature. This means that they may be loaded by a different signal. In the case of a plate-and-frame heat exchanger, as long as return water is being cooled, there is an advantage to using it. A heat-recovery chiller can be loaded to produce just the amount of hot water necessary using the condenser-water leaving temperature as a signal. If preferential loading is used with an absorption chiller, it may be loaded simply by decreasing its leaving-water temperature.

Sidestream configurations may also be used to preferentially load chillers or a heat exchanger used in a variable-primary-flow system, or to isolate chillers that are incapable of the same flow variations as the rest of the system.

Preferential loading – series arrangement

As previously discussed in “Series Chillers” on page 44, preferential loading is very simple when chillers are placed in series. If both the upstream and downstream chillers are given the system leaving water temperature setpoint, the upstream chiller is preferentially loaded and the downstream chiller operates whenever the upstream chiller can no longer achieve setpoint. If the downstream chiller is given the system setpoint, and the upstream chiller is given a warmer setpoint, then the downstream chiller loads first. Another method for preferential loading uses compressor RLA to determine when to bring on the next chiller.

Figure 47. Preferential loading - series arrangement

 

 

56°F [13.3°C]

49°F [9.4°C]

 

42°F [5.5°C]

 

 

 

Chiller 2

Chiller 1

 

 

setpoint = 42°F [5.5°C]

 

 

setpoint = 42°F [5.5°C]

 

Loads

76

Chiller System Design and Control

SYS-APM001-EN

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Trane SYS-APM001-EN manual Preferential loading series arrangement, Sidestream system control
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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.

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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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