Trane TRG-TRC016-EN Application Outside Range of Chiller, notes, System Variations, period three

period three

System Variations

notes

Application Outside Range of Chiller

air-cooled chiller

240gpm at 56.7°F

[15L/sat 13.7°C]

80gpm at 80°F

[5L/sat 26.7°C]

240gpm at 45°F

[15L/sat 7.2°C]

								°F
						45			80gpm at 45°F
					at
			pm					]
		g
60							°C		[5L/sat 7.2°C]
1					7.2
				at
		L/s
	0
[1

processload

Figure 86

Application Outside the Operating Range of the Chiller

Some process-load applications involve either temperatures or flow rates that are outside the capabilities of any chiller. This may include high return-water temperatures, high or low fluid flow rates, or high or low system ∆Ts. By using special piping arrangements, a standard chiller can still be used to satisfy the requirements of the process load.

Figure 86 shows a system in which the water flow requirement of the process load is below the minimum flow rate for a chiller with the required capacity. The system is designed like a primary-secondary system, but the production loop has a higher design flow rate than the distribution loop. This allows the water flow rate and ∆T through the chiller to be within the acceptable limits, while the water flow rate and ∆T through the process meet its requirements.

Alternatively, in a smaller system with a single chiller, a single pump on the chiller side of the bypass and a diverting valve to maintain the proper flow through the process load can achieve the same result.

78 TRG-TRC016-EN