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Option #1: DX SPLIT SYSTEM
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Simulation Assumptions
Type of Occupancy : Church
Operation time = 1354 hours/year (3.4 hours/day)
Week End Days = Saturdays and Sundays Average Full Occupancy = 90%
Week Days = Minimal time and office work only Average Occupancy = 15%
Maximum no. of People = 60
Lighting Load = 2 watts / sq. foot (21.5 watts/m2)
Area = 280 square meters (W = 12m; L = 23.5 m), approx. Room Design temp. = 24 C
Weather Data = Metro Manila
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Activity Areas Allocation
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Church Operation Schedule
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Results DX Split System
Calculated Total Capacity = 15 TR (peak load)
Split type qty. = 15 / 3 = 5 units of 3TR Split Units
Space Cooling power consumptions = 12,600 kWH/yr
Ventilation Fans = 240 kWH/yr
Lightings = 9,820 kWH/yr
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DX Split Units Daytime Operation
Lighting = 9,820 kWH/yr
Space Cooling = 12,600 kWH/yr
5 TR Maximum Size of each Split Unit
Vent Fans = 240 kWH/yr
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DX SPLIT TYPE A/C
OUTDOOR UNIT(S)
INDOOR UNITS
Control
15 TR CAPACITY OPERATING DURING THE DAY
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Option #2 : CHILLED WATER SYSTEM
Thermal Storage
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Assumptions
Type of Occupancy : Church
Operation time = 1354 hours/year (3.4 hours/day)
Week End Days = Saturdays and Sundays Average Full Occupancy = 90%
Week Days = Minimal time and office work only Average Occupancy = 15%
Maximum no. of People = 60
Lighting Load = 2 watts / sq. foot (21.5 watts/m2)
Area = 280 square meters (W = 12m; L = 23.5 m), approx. Room Design temp. = 24 C
Weather Data = Metro Manila
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Results
Calculated Total Capacity = 15 TR (peak load)
Selected Unit Capacity = 6 TR w/ storage tank(s)
Packaged Unit 2-ckts = 1 Unit ducted
Or Multi-Fan-coil Unit = 15 / 3 = 5 units free blow
Space Cooling power consumptions = 11,360 kWH/yr
Ventilation Fans = 240 kWH/yr
Lightings = 9,820 kWH/yr
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CHILLED WATER DUCTED or FREE BLOWConstant Volume
Lighting = 9,820 kWH/yr
Space Cooling = 11,360 kWH/yr
Vent Fans = 240 kWH/yr
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CHILLED WATER THERMAL STORAGE
Outdoor Unit
NIGHTIME OPERATION DAYTIME OPERATION
6-TR CAPACITY TO OPERATE
WHEN TANK CHARGING IS
REQUIRED.
Indoor Units
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Split Unit vs. Chilled Water Storage
Conventional DX Split System Chilled Water Storage
Cooling Capacity, TR 11 15 11 - 15
Operation Time:
Outdoor (ACCU) Daytime Night time (9PM-8AM)
Indoor Unit (FCU) Daytime Daytime
Cooling medium Refrigerant Chilled Water
Approximate Annual power
consumption, kWH
12,600 11,360 (about
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Sample Calc Peak vs. Off-Peak RatesDX Split Type
(Peak Rates)
Chilled Water
(Off Peak Rates)
Chilled Water Peak
Rates
kWH/year
Peak 12600 1640 10,360
Off Peak 0 9720 0
Cost/Year, Peso
Peak = 12600 x 10
= 126,000
= 1640 x (6.3 + 1.01)
= 11,988 + 342*
= 12,331
= 10,360 x 10
= 103,600
Off Peak 0 = 9720 x (3.09 + 1.01)
= 39,852 + 343*
= 40,195
0
Total = 126,000 = 52,526 = 103,600
* - Monthly charges
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