Below is our costing model to heat a series of commercial pools. We have modelled this on middle of north island so you can scale this accordingly.
For this pool we are recommending an equivalent unit to either the a AHP-95 or AHP- 120
OUTDOOR POOL 66sqm
POOL DESIGN
- Pool surface area (m2) = 66.0
- Pool volume (m3) = 73.0
- Bottom colour : Light
- Pool in very windy location
- Pool not shaded
- No pool cover used
- Filter back-flush to waste, % of pool volume /day = 1.00
Minimum set temperature = 28.0°C
- Heater capacity = load requirement
- Heat pump COP = 4.0
- Heat pump test conditions
- Air temperature = 17.0 øC
- Water temperature = 25.0 øC
- Variation of COP with temperature = 0.0500 /øC
- Heat pump run time, 20Hrs per Day
- Yearly Heat pump operating period
Season: Sep Oct Nov Dec Jan Feb Mar Apr
FUEL COSTS General electric tariff (cents/kWh) = 20.0
HEAT PUMP CAPACITY AND OPERATING COST WITHOUT COVER
| Heat pump capacity required kW | Heat pump electricity use kWhr/day | Heat pump operating cost | |
| January | 64.5 | 408 | 2529 |
| February | 56.1 | 350 | 1960 |
| March | 60.1 | 379.5 | 2252 |
| April | 64 | 428.9 | 2573 |
| May | 0 | 0 | 0 |
| June | 0 | 0 | 0 |
| July | 0 | 0 | 0 |
| August | 0 | 0 | 0 |
| September | 98.2 | 689 | 4134 |
| October | 79.3 | 534.7 | 3315 |
| November | 70.8 | 460.1 | 2761 |
| December | 64.8 | 410.9 | 2547 |
Estimated Yearly Usage & Cost 110862 kWhr $ 22172
Note: We would generally allow a 20% Derating of the Heat pump size due to unknown site factors. This would increase the size of the heat pump to 118 KW output to enable September swimming.
HEAT PUMP CAPACITY AND OPERATING COST WITH THERMAL COVER WHEN CLOSED
| Heat pump capacity required kW | Heat pump electricity use kWhr/day | Heat pump operating cost | |
| January | 25.4 | 154.6 | 958 |
| February | 21 | 127 | 712 |
| March | 25.4 | 155.4 | 963 |
| April | 29.8 | 193.6 | 1162 |
| May | 0 | 0 | 0 |
| June | 0 | 0 | 0 |
| July | 0 | 0 | 0 |
| August | 0 | 0 | 0 |
| September | 47.9 | 325.8 | 1955 |
| October | 35.1 | 229 | 1420 |
| November | 29.3 | 183.6 | 1102 |
| December | 25.7 | 158.3 |
982 |
Estimated Yearly Usage & Cost 46268 kWhr $ 9254
Note Sept, As per above generally allow a 20% Derating of the Heat pump size due to unknown site factors. This would increase the size of the heat pump to 58 KW output to enable September swimming.
By Installing a Thermal Cover system whilst the pool is closed you are reducing the heat pump size & capital cost required plus and saving approximately $12,918.00 Per annum in running cost.
For extended workings and further costings please contact us.
rebecca@sunbather.co.nz