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1. HOT WATER LOAD INFORMATION:
2. DESIGN CONDITION:
2.1) Make up water temperature (T1) = 30 C
2.2) Design hot water temperature (T2) = 60 C Fill in
required
2.3) Design run time = 10.28 hours
3. HOT WATER DEMAND CALCULATION (60 DEG C)
3.1) Design from Number of Guest and Activities
a) at Guestroom = 291 Rooms
Average guest per room = 2.0 Person
Hot water demand per guest (60 C)
- 2 x Shower (10 mins shower) = 180 Litre/day Flow rate = 0.5
l/s (hot + cold water)
- 1 x Bath Tub = 60 Litre/day
- 5 x Lavatory (2 litre ea.) = 10 Litre/day
Total HW Demand per guest = 250 Litre/day
Total Hot Water demand for Guestroo = 145,500 Litre/day
b) at Kitchens
Estimated No. of Meals = Total Guest x avg. meal per person
= 1,164 meals
Total Hot Water demand for Kitchens = 10,592 Litre/day (@ 9.1
litre per meal)
c) at SPA
No. of Treatment room = 0 rooms
Operating hour = 12 hour
Utilisation times (1.5 hous per guest) = 8 times
Total guest at 100% occupied = 0 person
Hot Water Demand per guest
- 1 x Shower (10 min Shower) = 28 Litre/day
- 1 x Bath Tub = 80 Litre/day
- 2 x Washbasins = 4 Litre/day
Total demand per guest per day = 112 Litre/day
Total Hot Water demand for SPA = 0 Litre/day
d) Others
Total Hot Water demand for Others = 0 Litre/day
Total Hot Water Demand = 156,092 Litre/day (@ 100%
Occupancy)
% Occupancy = 80%
therefore; Total Hot Water Damand = 124,874 Litre/day
DESIGN CALCULATION
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DESIGN CALCULATION
4. OPTIMUM SYSTEM DESIGN CALCULATION FOR HEAT PUMP WATER
HEATER
4.1) Peak Load Calculation
Hourly Peak Demand 18,731 Litre/hr
Peak Duration = 3 hr
Total Peak Demand for entire peak = 56,193 Litre
Number of Building = 1
HW Demand During Peak / Building = 56,193 litre/ total peak
period
Storage Tank Size = 124,874 x 0.20 = 24,975 Litre
Storage Tank Size = 30,000 Litre
Storage Tank from COMPACT HP = 0 Litre
Total Effective Volume (80% usable) = 24,000 Litre
Actual HW Demand during peak = 32,193 Litre (total peak
period)
Actual Hourly HW Demand during pea = 10,731 litre/hr
Required Heating Capacity (HPC) = 373 kW
**40% loss factor for standard model = N ( Y / N ) ; Y for
standard / N for Advanced
Adjusted Heating Capacity (HPC) = 373 kW
5. EQUIPMENT SELECTION
5.1) AWHP System Solution
Alternative 1: HEAT PUMP
Power output(30 C ambient) = 65.00 kW/unit
Cooling Capacity = 55.70 kW/unit
Power Input (kW) = 14.50 kW
Coefficient of Performance (COP) = 4.48
Built-in storage size = 0 Litre
Unit of Heat Pump = HPC / Heating Capacity
= 373 / 65.00 kW
= 5.75 Unit
Minimum running unit = 6.00 Unit
Recommended: = 6.00 Unit
Recovery rate (L/hr) = 11,207 L/hr (from operating unit)
Alternative 1: STORAGE TANK
Recommended: = 2.00 X 15,000 L
6. OPERATING HOUR
Morning peak running hour = 56,193 = 3 hr
Filled up tank (day time) running hour = 24,000 = 2.14 hr
Evening peak running hour = 56,193 = 3 hr
Filled up tank (night time) running hour = 24,000 = 2.14 hr
TOTAL RUNNING HOUR = 10.28 hr
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DESIGN CALCULATION
7. ENERGY CONSUMPTION COMPARISON
7.1) Heat Pump
Week Day Operating
kWh/day - On Peak = 6.00 hr
= 522 kWh/day
kWh/day - Off Peak = 4.28 hr
= 372.63 kWh/day
Sat-Sun Day Operating
kWh/day - On Peak = 0.00 hr
= 0 kWh/day
kWh/day - Off Peak = 10.28 hr
= 895 kWh/day
8. UTILITY & FUEL RATE
8.1) Electricity Cost
On Peak = 2.6950 Baht/kW-Hr (Mon - Fri: 9:00 - 22:00, 13 hr)
Off Peak = 1.1914 Baht/kW-Hr (Mon - Fri: 22:00 - 9:00, 11
hr)
(Sat - Sun: 0:00 - 24:00, 24 hr)
Demand Charge = 132.93 Baht/kW
Ft Rate = 0.7583 Baht/kW-Hr
9. ENERGY COST SAVING
9.1) Operating Cost - Heat Pump
Unit Rate Yearly Expense = 593,668 Baht/year
Demand Charge Expense = 138,779 Baht/year
Ft Charge Yearly Expense = 247,615 Baht/year
Total Yearly Expense for Heat Pump = 980,061 Baht/year
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