Quantech QWC3 Manual page 20

Water-cooled scroll liquid chiller, 50-200 tons, 60hz, r-410a

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FORM QWC3-EG1 (217)

Selection Data (Cont'd)

Or combine the two formulas:

Cond. Water GPM =

SAMPLE SELECTION

Water Cooled Chiller (QWC3)

GIVEN – Chill 200 GPM of water from 56ºF to 44ºF and 0.0001 evaporator fouling factor

with 85ºF to 95ºF condensing water available. The fouling factor is 0.0005 for the con-

denser.

FIND – The required unit size capacity, kW, EER, and water pressure drop.

SOLUTION:

1. Chilled water range = 56ºF - 44ºF = 12ºF and correction factors are 1.009 for Tons

and 1.001 for kW for the evaporator.

Capacity (Tons) =

2. From the rating, a model QWC3115TSE has a capacity range required. For the

evaporator leaving water temperature of 44ºF and a condenser leaving water tem-

perature of 95ºF, the unit capacity rating table indicates:

Tons

EER

Correcting for the 12ºF chilled water range and the 0.0005 condenser-fouling fac

tor (Correction factors for the condenser are 0.995 for Tons and 1.010 for kW):

Tons

Condenser Tons x 30

Condenser Water Range (ºF)

GPM x Chilled Water Range

200 x 12

= 100TR

108.4

83.5

15.6

= 108.4 x 1.009 x 0.995 = 108.8TR

= 83.5 x 1.001 x 1.010 = 84.4 kW

QUANTECH

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