Same tower, larger chiller

System Design Options

Table 10. Same tower, smaller approach

				Same tower,
		Present		smaller
				approach

Capacity, tons		450	[1,580]	450 [1,580]
[kW refrigeration]

	Approach, °F [°C]	7	[3.8]	5.5 [3]

Cooling tower	Flow rate, gpm [L/s]	1350 [85.2]		900 [56.8]

	Entering temperature, °F [°C]	94.3 [34.6]		97.6 [36.4]
	Entering temperature, °F [°C]	94.3 [34.6]		97.6 [36.4]

	Leaving temperature, °F [°C]	85	[29.4]	83.5 [28.6]

Ambient wet-bulb		78	[25.6]	78 [25.6]
temperature, °F [°C]

One retrofit option that benefits many building owners is installing a new, larger chiller selected for a lower flow rating and re-using the existing cooling tower, condenser-water pump, and condenser-water pipes. In many cases, this allows the building owner to increase the chilled-water-system capacity for an expansion, with a limited budget. An example can easily demonstrate this.

A hospital presently has a 450-ton [1,580-kW refrigeration] chiller that needs to be replaced. The condenser water flow is 1,350 gpm [85.2 L/s]. The present cooling-tower selection conditions are summarized in Table 11. Recently, the cooling-tower fill was replaced. The tower, condenser water piping, and pump are in good condition. The hospital is planning an addition with 50 percent more load for a total of 675 tons [2,370 kW]. Must the hospital replace the condenser water system? The answer is “no,” as long as the chiller is selected properly.

How is this possible? As long as the new chiller’s condenser-water pressure drop is at or below that of the present chiller, the same amount of water can still be pumped. With the same flow rate, a 675-ton [2,370-kW] chiller may be selected with a condenser-water-temperature rise of approximately 15°F [8.3°C]. Using the cooling-tower manufacturer’s selection software, the same cooling tower can be selected at the elevated temperature difference. As shown in Figure 22, the new selection point will be:

•entering water temperature: 103°F [39.4°C]

•leaving water temperature: 88°F [31.1°C]

•ambient wet bulb: 78°F [25.6°C]

Chiller System Design and Control

SYS-APM001-EN

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.

Trane SYS-APM001-EN manual Same tower, larger chiller

Models: SYS-APM001-EN

System Design Options

Table 10. Same tower, smaller approach

Present

smaller

approach