pool-heat-pump-sizing-calculator

.		Pool's Water Surface Area (m²):		.
		Estimate your pool's water surface area
		Pool length: (m)	Pool volume: (l)

		Average width: (m)	Average depth: (m)

		Pool's surface area:
			<<< Adjust if different

		Note! Pool surface area must be correct
		all heat loading calculations are based on
		water surface area, include water features

		Specific Local Effects on Water Temperature
		Select your city:

		Your local wind strength:

		Your pool's wind sheltering structures:

		Shading on pool (between 10am-4pm):*

		The colour of your pool walls and floor:

		Bubble cover usage (transparent):


		© Copyright 2024 Optex Solar Pty Ltd.
	.

.		Offset heat pump costs with solar?	.

		(if no, then skip the below section)

		Solar Heater Booster Specifications
		Roof pitch (or mounted collector pitch):

		Compass direction of mounted collectors:

		Roof type and colour:

		Manual or automatic system:‡

		Depth of solar suction ports:

		Pump height for solar system:

		Size of collector area to simulate:

		Type of collector:

		Select custom solar coverage (scale by):


		© Copyright 2024 Optex Solar Pty Ltd.
	.

.	Pool Temperatures Chart (°C) vs Months of Year		.






















	Total Swimming Season Length (Months)
	Ave Unheated Pool	Your Pool's Season
	Heating Extension	Heat Pump Season

	© Copyright 2024 Optex Solar Pty Ltd.

.		Minimum Heat Pump Capacity Required			.
		(Based on data supplied so far)
		Minimum capacity required
		Month that requires this capacity

		Allow extended running hours?

		Note: the longer you allow the less efficient, as
		it's forced to run in cooler mornings/evenings,
		however, the lower capacity that's required

		Heat Pump Running Data (per day)
		Month	Daily Run	Capacity
		Month	Time (h)	Required (kW)













		© Copyright 2024 Optex Solar Pty Ltd.
	.

.		Heat-Up Time Estimate				.
		If you are going to be running the unit
		off/on, you'll want to consider heat-up times.
		Increase capacity to allow for faster heat-up

		New heat pump capacity (kW)

		Heat-Up Time in Each Month
		(Note: this is from your unheated pool)
		Month	Temperture	Total	Over
		Month	Gain Req.	Hours	Days












		Note: if the time to heat is many days,
		the specified desired ave. temperature may
		not be reached, instead it'll may be touched on

		© Copyright 2024 Optex Solar Pty Ltd.
	.

.	Pool Temperatures Chart (°C) vs Months of Year		.






















	Total Swimming Season Length (Months)
	Ave Unheated Pool	Your Pool's Season
	Heating Extension	Heat Pump Season

	© Copyright 2024 Optex Solar Pty Ltd.

.		Heat Pump COP Adjustments			.
		Heat pump AHRI† COP specs used:
		HAHH:	HAMH:	LAMH:

		Use custom heat pump AHRI† specs:

		Heat pump efficiency loss in 10 years:§
			Used in calc	Custom (%)
		COP derate
		(used in the 10 year running cost calculations)
		Finer Monthly COP Adjustments
		Add to select monthly values		Using COP
		Jan
		Feb
		Mar
		Apr
		May
		Jun
		Jul
		Aug
		Sep
		Oct
		Nov
		Dec
		(new unit initial COPs are shown only)
		Average new heat pump COP

		© Copyright 2024 Optex Solar Pty Ltd.
	.

.		Adjust Solar Pump Power¥			.
		Balance flow to see effects on pump power & collector efficiency

		Solar mains pump required:


		Heat removale factor
		Resultant new solar COP:




		Finer Max Desired Temp Adjustments
		Add to select monthly values		New desired
		Jan	0
		Feb	0
		Mar	0
		Apr	0
		May	0
		Jun	0
		Jul	0
		Aug	0
		Sep	0
		Oct	0
		Nov	0
		Dec	0

		© Copyright 2024 Optex Solar Pty Ltd.
	.

.	Pool Temperatures Chart (°C) vs Months of Year		.
			.





















	Total Swimming Season Length (Months)
	Ave Unheated Pool	Your Pool's Season
	Heating Extension	Heat Pump Season

	© Copyright 2024 Optex Solar Pty Ltd.

Energy Prices & Custom Adjustments

Assumed gas price:

Use custom gas price: (c/MJ)

Use custom electric tariff: ($/kWh)

Night tariff: (for heat pump if used)

Night tariff adjustment: (% of Daytime)

Day or night tariff heat pump usage:

Financial details for cost comparison

Interest rates:

Your tax bracket:

Anticipated fuel source inflation:

Note:

A dollar saved is NOT a dollar earned

$1 saved is actually $1.325 earned

(depending on your tax bracket)

These compounded costs are what you

need to EARN to offset your financial loss

10 Year Heating Cost Comparison^

Year

Solar

Heat Pump

Gas

Show as post tax costs not wages:

To run auxiliary heating under these

specific conditions, over 10 years you'd

need to work to EARN an extra:

for running a Heat Pump - or

for running a Gas Heater

We hope this demonstrates that while

auxiliary heaters are great for guaranteeing

a set temperature - running them as your

sole source of heating without solar

and/or a pool blanket is terrible idea

.	Pool Temperatures Chart (°C) vs Months of Year		.
			.





















	Total Swimming Season Length (Months)
	Ave Unheated Pool	Your Pool's Season
	Heating Extension	Heat Pump Season

	© Copyright 2024 Optex Solar Pty Ltd.

.						.
	Month	Ta	Ts	Tw
	Jan
	Feb
	Mar
	Apr
	May
	Jun
	Jul
	Aug
	Sep
	Oct
	Nov
	Dec


	Month	V10	Qh	Qi	Pa
	(Units)	m/s	MJ/m²d	MJ/m²d	kPa
	Jan
	Feb
	Mar
	Apr
	May
	Jun
	Jul
	Aug
	Sep
	Oct
	Nov
	Dec

	© Copyright 2024 Optex Solar Pty Ltd.

Data Used for Heat Pump Calculations

Month

Ave_Temp

Td-Tw

R_Humidity

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Average Daily kWh Required

(to maintain temperature shown on chart)

Month

Solar

Heat Pump

Gas

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

.	Heat Loss Calculation Factors Used	.
	Pool absorption factor (alpha)
	(Appendix B5, AS 3634—1989)
	Wind factor (at 0.3m)
	(Appendix B2, AS 3634—1989)

	Pool Blanket Heat Loss Corrections:
	(for 100% of the time covered pool)
	Evaporation loss scaling factor
	Convection loss scaling factor
	Radiation loss scaling factor
	Light transmittance factor

	Data Used for Solar Heating System
	Solar system flow rate (L/min)

	Data Used for Gas Heaters:
	Gas heater efficiency
	10 Year loss in gas heater efficiency

	Data Used for Pump Heaters:
	10 Year loss in heat pump efficiency

	© Copyright 2024 Optex Solar Pty Ltd.

.		Auxiliary Heating Efficiencies	.
		What heat pump efficiency† to use:

		What gas bolier efficiency to use:


		Average Yearly Running Cost Summary
		Includes: interest, unit efficiency loss
		and energy inflation costs. Does
		not include maintenance costs.
		Solar pool heater (annually):

		Pool heat pump (annually):

		Gas heater (annually):


		Solar Offset Percentage
		Offset from solar: (if installed)


		© Copyright 2024 Optex Solar Pty Ltd.
	.