Off Peak Cooling Chw

7/29/2019 Off Peak Cooling Chw

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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

Documents

Off Peak Cooling Chw