McQuay MCK025A Especificaciones Pagina 93

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Step 4
If air flow value is different from the nominal value(high speed), then refer to specification from
Page 50 to 74 for
the air flow required (medium or low speed). Determine the total and sensible correction factor from Air Flow
Capacity Correction Factor
(Page 49).
Step 5
If the unit is to operate at an altitude above sea level, multiply the capacity correction factors by an Altitude
Correction Factors. Refer to
Page 49.
Step 6
Calculate the actual cooling capacity by multiply the nominal capacity (from Step 3) with Air Flow Capacity
Correction Factor from Step 4 and the Altitude Correction Factor from Step 5.
Actual Capacity, W = Nominal capacity (Step 3) x Air Flow Capacity Correction Factor (Step 4)
x Altitude Correction Factor (Step 5)
Step 7
Water flow rate can be determined by:
Litres/Min =
Total Cooling Capacity, W
70 x Water Temperature Rise °C
USGPM =
Total Cooling Capacity, Btu/H
500 x Water Temperature Rise °F
Step 8
Heating Capacities at nominal air flow
(Page 137 to 141 - Heating Performance Chart) are based on standard
condition of 60°C EWT and 21°C EAT. The actual heating capacity can be obtained by using the Heating
Capacity Correction Factor
(Page 49) and Altitude Correction Factor as per Step 5.
Hence Actual Heating Capacity, W = Nominal Capacity
(Page 137 to 141) x
Heating Capacity Correction Factor
(Page 49) x
Air Flow Capacity Correction Factor (Step 4) x
Altitude Correction Factor (Step 5)
Step 9
Water Pressure Drop Tables are on Page 43 to 48.
EXAMPLE
Select a ceiling cassette type fan coil unit at the following design specification:
Room design condition : 27°C DB / 19°C WB
Room Cooling Load : 8 kW sensible capacity / 11 kW total capacity
Room Heating Load : 22 kW
Entering water temperature : 7°C cooling / 70°C heating
Water temperature rise : 5°C
Air Volume : 1000 CFM
Altitude : 600 m
SOLUTION
Step 1
Based on the type of fan coil required and the design conditions, tentatively select MCK050AW. From the
cooling capacity performance chart
(Page 114), at 26.7°C DB / 19°C WB air temperature, 7°C entering water
temperature and with 5°C water temperature rise, the cooling capacity for this unit is 11.7 kW total capacity and
8.5 kW sensible capacity.
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