Domestic Swimming Pool Cowshed

Solar Hot Water Heating - Domestic


Vacuum Tube

Modern solar design uses tubes that consist of 2 layers of borosilicate glass with a vacuum layer between them. The vacuum acts like a thermos flask, retaining up to 97% of the thermal energy, resulting in an increased efficiency. The Sun's thermal energy is then transferred to the manifold via the U pipes located in each tube.

The Alpha Solar evacuated tube technology delivers measurably higher performance than other evacuated tube or flat plate systems on the market today.How? Because Alpha Solar evacuated tubes contain not one but two transfer pipes to double the heating capacity of each tube. This is called the U pipe system and when combined with Alpha Solar’s unique CPC reflector, creates a smaller high performance collector that outperforms all equivalent heat pipe and flat plate systems.

CPC Technology

Alpha Solar’s unique CPC or Compound Parabolic Concentrator reflector ensures that the sun’s rays can reach all 360° of each tube’s surface area. Even on a dull winter day your Alpha Solar collector will be working hard, saving you money.

The unique CPC reflector is a highly polished metal component that sits just below each tube in the collector. It ensures that the sun’s rays are reflected from the highly polished surface right into the back surfaces of the tubes to ensure the most efficient capture of the available light.

Easy Change System

No more maintenance problems with awkward and hard to use fittings. Alpha Solar’s easy to use clip out - clip in system ensures that replacing a tube is simple and safe.

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Solar Hot Water Heating - Swimming Pools

Alpha Eco - swimming pool solar heating panels

Alpha Eco solar absorbers of high molecular polyethylene offer the right foundation for operating such installations
The problem is familiar. An outdoor swimming pool that is not heated is only really comfortably warm for three or four weeks at the height of summer - very little when you think of all the investment and maintenance you put into it. An indoor swimming pool has to be heated all the year round, even in the middle of summer.

Heating a swimming pool using conventional means of energy can be a costly business, and is also a load on the environment.

But the heating of swimming pools is an ideal application for solar energy. Not a very high Temperatures are needed but large volumes of water are needed to be heated so it makes sense to operate such an installation with a large flow rate at a relatively low temperature level , that way your Alpha Eco swimming-pool solar heating produces optimum efficiency.

Enjoy a well-tempered swimming pool with Alpha Eco solar heating
Attractive investment for an inexhaustible source of free energy

Advanced technology - your contribution to protection of the environment
The water in the swimming pool can flow through the Alpha- Eco absorbers in either direction, so they can be mounted both lengthwise and side by side. The individual rows of absorbers are connected on a Tichelmann principle (same routes for each row). It is not advisable to connect more than seven absorbers in series.


Recommended absorber area in % of pool surface for open-air pools with cover or indoor swimming pools (early October through mid to the end of April) Temperature increase by 7-10 °C compared to unheated swimming pools

The absorber area should be chosen 50% larger if there is no cover.The regionally different number of sunshine hours can be allowed for by adding or deducting up to 20% absorber area.

Pump performance

The flow rate should be 150 to 25 0 l/m2 absorber area per hour. The required type of pump is easy to determine. The delivery rate is calculated from the absorber area x 200 liters The delivery head is the difference in height between the water level and the absorber panel plus approx. 5 m.

Different configurations of Alpha Eco swimming pool solar heating

1. Operation with filter pump via three-way motor ball valve with solar pool pump controller.

This configuration can usually be selected if the absorbers are not to be set up higher than 6 m above the surface of the water.

The three-way motor ball valve is integrated into the pressure line of the filter installation. Because of the solar pool pump controller the ball valve is changed over when the absorber temperature is higher than the temperature of the water of the swimming pool. The filter stream is then pumped through the absorbers. The warmed water flows back into the filter circuit by way of a Tee.

2. Operation with own pump and solar pool pump controller integrated into filter circuit.

In many cases it may be sensible or even necessary to install a separate pump for the solar heating. For example when the delivery head from the water level to the absorber panel is more than 6 m.

The water is diverted from the filter installation by way of a Tee and pumped through the absorbers by the auxiliary pump.

This pump is switched by the pool pump solar controller to ensure that it only runs to actually win energy. The filter and solar pump are separately regulated.

It is usually advisable to integrate non-return valves in both the solar and the filter circuit.

3. Operation with own pump and solar pool pump controller - piping independent of filter circuit.

This configuration is chosen when the filter piping is difficult of access. The water is sucked out of the swimming pool by an immersion pipe, pumped through the absorbers, and the warmed water is conducted back into the swimming pool.

Here too the difference temperature regulation ensures that the pump only runs to win energy. If the pump is mounted above the water level and the delivery head is more than 5 m, a nonreturn valve should be incorporated.

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Solar Hot Water Heating - Cowshed

Demo Model based on a farm of 245 cows using 700 litres of hot water per day

Benefit to client

An average farm of 245 cows would spend approximately $8,000 to $9,000 per year on hot water requirements. Installation of solar hot water panels has cut this clients usage down to 35 kilowatts per day potentially cutting his yearly hot water spend in half. A hot water system is cheaper to buy over a PV System and is more efficient.


This model consisted of three 300 litre stainless steel cylinders each having 30 evacuated tubes connecting to farm water supply line, reticulated to solar hot water cylinders, then reticulated back to existing dairy cylinder in cow shed. No pumps or power required.


Total supply and install costing for this model was between $22,000 to $25,000 + GST


This models optimum performance per collector is 3 kilowatts per hour. Electrical meter has been connected to hot water cylinder for data collection purposes and over 7 days only 242 kilowatts was consumed (fine weather). Based on data collected to date this model should give a minimum return estimated at $4,500 per year.


Eight weeks required for delivery of componentry. During this time the site is prepared and water reticulation starts, boxing and concrete pads are poured. Complete installation and set up takes a total of approximately nine weeks.

Site Preparation

  1. Concrete pads poured and mounting brackets installed

  2. Installation of solar collectors, tubes and start of water reticulation

  3. Water reticulation to cowshed and hot water cylinder

  4. Flow diagram water reticulation


  • Five year warranty on cylinders and frame

  • Ten year warranty on tubes

  • All warranties are subject to water quality which will be checked prior to purchase

Life expectancy

Twenty years +