Quartz TECHNICAL MANUAL AIR COOLED WATER CHILLERS AND HEAT PUMPS WITH AXIAL FANS Wfcf Pdcf

COMPRESSORS CAPACITY STEP CONTROLS

		CORRECTION TABLE			Operation with glycol
	Water temp.		Glycol		WFCF
						PDCF
						1,125
7			10%		1,012
			20%		1,048	1,32
			35%		1,109	1,62
3			10%		0,870	0,85
			20%		0,875	0,92
			35%		0,925	1,13
-2			10%		0,710	0,64
			20%		0,730	0,85
			35%		0,770	1,05
-5			10%		---	---
			20%		0,600	0,56
			35%		0,625	0,7
WFCF = Water flow correction factor				PDCF = Pressure drop correction factor

The water flow rate and pressure drop correction factors are to be applied directly to the values given for operation without glycol. The water flow rate correction factor is calculated in order to maintain the same temperature difference as that which would be obtained without glycol. The pressure drop correction factor takes into account the different flow rate obtained from the application of the flow rate correction factor. When the new flow rate is determind the capacity can be calculated using the formula Q=4.19m ΔT, where Q is the duty in kw, m is the flow rate in kg/s and ΔT is the fluid temperature difference.

				CORRECTION TABLES		Different DT
	Water temperature
				3		5	8
	difference
							1,02
	CCCP		0,99			1
	IPCF		0,99			1	1,01
CCCP = Cooling capacity			correction factor		IPCF = Input power correction factor
		CORRECTION TABLES				Different Fouling factors
	Fouling factor			0,00005		0,0001
							0,0002
							0,94
	CCCP		1			0,98
	IPCF		1			0,98	0,95
CCCP = Cooling capacity			correction factor		IPCF = Input power correction factor
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