Evacuated Tube Solar water heating

Evacuated Tube Solar water heating

 – for hot water and hydronic house heating.

 

ultimate solar 40 tube

 

  • Maximum performance – Heat pipe has up to 50% more efficiency than a flat plate collector, and U tube has almost double
  • Works in all climates, including a wintery, overcast day
  • Easy to install – Split system provides solar heating without a storage tank on the roof
  • Instant unlimited mains pressure hot water with either gas or electric boosting
  • Long life materials, maintenance free
  • Designed to withstand extreme frost conditions, using closed loop system.

 

What are Evacuated Glass Solar Tubes?

Inside and outside tubes are made from extremely strong borosilicate glass that are fused together to form a vacuum between two tubes.

  1. Outer Tube – Allows the sun’s rays to pass through with minimal reflection
  2. Inner Tube – Special selective coating on the outside of the tube contributes the highest thermal efficiency and good thermal stability
  3. Evacuated Space – Stops heat loss / emission to outside of the glass tube, making these collectors particularly effective during cold and cloudy weather
  4. Selective Surface – Absorbs the maximum solar radiation to convert into heat efficiently
  5. Cylindrical Shape – Sun’s rays are perpendicular to the absorber for most of the day
  6. Fin – Transfers the heat to copper tube without heat loss
  7. Copper Conduction Tube – Passes the heat to the water / fluid inside the copper tube
  8. Barium Layer – Actively absorbs the air to maintain the vacuum between the two tubes

 

How does it work?

The sun’s rays pass through the outer tube, and perpendicularly strike the absorber surface on the outside of the inner glass tube.

The selective surface absorbs maximum solar radiation and converts it into heat very efficiently.

Because the sunlight is perpendicular to the absorber tubes almost all day, the sun’s energy is absorbed and transferred efficiently.

The insulation formed by the vacuum space between the outer and inner tubes minimises heat loss to the outside, whilst allowing the sun’s energy to reach the copper tube inside the inner glass tube.

 

1. Close-coupled roof tank models, with mains pressure coil inside.

Red Circle evacuated tube hot water

Red Circle close-coupled evacuated tube solar hot water

Three convenient sizes:

  • Great for domestic and some commercial applications
  • Low pressure stainless tank with a high pressure heat exchange coil inside
  • “Wet tubes” use the sun’s energy to directly heat the water in the tubes.
  • Ideal for Wet backs/Wood Heaters
  • Eliminates unnecessary boosting
  • Flexible boosting options – fit as a preheater to existing gas or electric storage tanks, thermosiphon into a wood heater below, connect to an instantaneous gas heater, or use the optional 2.4kW in-tank element.
  • Mounting frame is best suited to metal roofs.   Can be mofified for fitting to tile roofs.
  • Suitable for high frost areas
  • 10 year manufacturers warranty on tanks frames and tubes.

 

How it works

  • Copper tube internal heat exchanger.

heat exchanger oil

The close coupled system uses a 30 mtr 14mm copper coil to transfer the heat from the low pressure storage tank to the mains pressure water used in the house. As the water enters the tank through the mains water supply line, it passes through the heat exchanger and absorbs heat instantly.

  • Low pressure storage.

Having a low pressure storage tank with high pressure heat exchange has many benefits.

No legionella risk.

Open vented to safely relieve the pressure from the water expanding due to heat.

Wood fire boosting ready.

Low manufacturing costs.

  • Wet tubes.

Red Circle Solar uses 1800 x 58mm high quality evacuated tubes with tri coating technology.  Our split system manifolds use the same evacuated tubes combined with a heat pipe. Wet tubes are directly heated by the sun and transfer the heat to the water that is in the storage tank using a thermosyphon.

  • Pitching frames.

The on roof system come with either a 15 deg or a 45 deg pitching frame.  Custom frames are available.

  • Solar powered tank filling kit.

The low pressure storage tank is kept flu using a 12 volt solar powered solenoid coupled with a stainless steel Reed switch float. If the tank water level drops due to evaporation, the float opens the solenoid and lets water enter the tank. Once the tank is full again, the float rises and shuts the solenoid, turning off the water. All powered by the sun!

  • Boosting.

Every solar hot water system needs boosting in the winter as the days are shorter and the solar radiation is less due to the sunlight passing through  more atmosphere.

 

Close-coupled Systems and prices – May 2017
250 litre stainless steel system with 30 evacuated tubes and frame$2199
200 litre stainless steel system with 24 evacuated tubes and frame$1949
165 litre stainless steel system with 20 evacuated tubes and frame$1749
Add optional Electrical boost element 2.4 kw, with thermostat and fuse$130
Installation kit for close-coupled systems on mains pressure$285
Installation kit for close-coupled systems on tank pressure$260

Freight from Melbourne-based supply warehouse not included.  Freight is extra.

 

2. Split-systems, with tank on the ground, and collector on the roof.

Ultimate red circle solar water heater

  • For domestic and some commercial applications.
  • Evacuated tubes for use in a “Split system” where water is heated as it flows though the manifold and back to a storage tank.
  • Can be connected to a ground mounted electric storage tank.
  • Can be connected via pump or thermosiphon (where possible) to an in-roof tank.
  • “Dry tubes” use the sun’s energy to heat copper rods inside the tubes, which then transfer the heat to water through a heat exchange process.
  • Suitable for all roof types including tiles.
  • 10 year manufacturers warranty on the manifolds frames and tubes.

 

Three convenient sizes:

Split Systems and prices – May 2017
300 litre stainless steel vertical tank, with 30 evacuated tubes, 240v pump and controller$2899
400 litre stainless steel vertical tank, with 2 x 20 evacuated tubes, 240v pump and controller$3899
500 litre stainless steel vertical tank, with 2 x 24 evacuated tubes, 240v pump and controller$4499

Freight from Melbourne-based supply warehouse not included.  Freight is extra.

 

3. Upgrade kits for solar heating of existing tanks

Evacuated tube collector

  • For domestic and some commercial applications.
  • Evacuated tubes for use in a “Split system” where water is heated as it flows though the manifold and back to a storage tank.
  • Can be connected to a new or existing ground mounted electric storage tank.
  • Can be connected via pump or thermosiphon (where possible) to a new or existing in-roof tank.
  • “Dry tubes” use the sun’s energy to heat copper rods inside the tubes, which then transfer the heat to water through a heat exchange process.
  • Suitable for all roof types including tiles.
  • 10 year manufacturers warranty on the manifolds frames and tubes.

 

Systems and prices – May 2017
10 tube manifold, including frame (specify 0, 15 or 45 deg)$849
20 tube manifold, including frame (specify 0, 15 or 45 deg)$1299
24 tube manifold, including frame (specify 0, 15 or 45 deg)$1399
30 tube manifold, including frame (specify 0, 15 or 45 deg)$1699
Pump and controller 240v, including sensors$349
Solar powered stainless pump, 20w panel and controller (incl sensors)$399

Freight from Melbourne-based supply warehouse not included.  Freight is extra.

 

3. Stainless steel solar hot water tanks.

solar water heater tanks

Tanks and prices – May 2017
300 litre vertical 304 stainless steel tank with sacrificial anode$1499
400 litre vertical 304 stainless steel tank with sacrificial anode$1999
500 litre vertical 304 stainless steel tank with sacrificial anode$2199
300 litre in-roof  horizontal 304 stainless steel heat-exchange tank with tray$1799

Freight from Melbourne-based supply warehouse not included.  Freight is extra.

 

Order now, or ask a question:

Queensland:    (07) 5448 8304      qld at solazone.com.au

Victoria:            (03) 9808 7337      vic at solazone.com.au

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