Chilled-Water System Variations

body of water. Flow rates need to be carefully selected to balance the economic and environmental requirements.

Preferential Loading

Preferential loading is desirable for systems that use heat recovery or free cooling to allow the equipment used in these schemes to remain more fully loaded. In a heat recovery system, a more heavily loaded heat recovery chiller produces more heat that can be recovered for the desired process. Similarly, if the condenser free cooling method is preferentially loaded in the sidestream arrangement discussed below, it receives the warmest return water temperature and thus continues to operate as load and/or condenser water temperature increases.

Preferential loading may also be beneficial for use with either a high- efficiency chiller that should be fully loaded whenever possible, or a chiller using a fuel other than electricity, such as an absorption chiller using waste steam from a cogeneration plant, or a chiller coupled with an engine that generates electricity. When used with the latter, the system is able to preferentially load the alternate fuel chiller when the cost of electricity is high.

Preferential loading - parallel arrangement

If a chiller in a decoupled system is moved to the distribution side of the bypass line in a primary-secondary system, due to system hydraulics and temperatures, the chiller is preferentially loaded when it is turned on. As shown in Figure 44, Chiller 1 always receives the warmest system water and is preferentially loaded. As previously discussed, chillers on the production side of the bypass line (Chillers 2 and 3) are loaded to equal percentages. The parallel preferential arrangement works best if Chiller 1 is capable of creating the desired system supply water temperature, as it will be sending chilled water directly to the distribution system.

Figure 44. Parallel preferential loading arrangement

 

Chiller 3

 

Equal

 

 

Percentage

 

Production

Loading

Chiller 2

 

 

Preferential

Bypass Line

Distribution

Loading

 

 

Chiller 1

SYS-APM001-EN

Chiller System Design and Control

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Trane SYS-APM001-EN manual Preferential Loading, Preferential loading parallel arrangement
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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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