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					Solar Water Heater




AHB Technology - Solar Water Heater
http://www.ahbtechnology.com   Tel: +1 (613) 422-0888   Fax: +1 (613) 422-2882
                                                                    Solar Water Heater
                                 http://www.ahbtechnology.com                       Tel: +1 (613) 422-0888
                                 info@ahbtechnology.com                             Fax: +1 (613) 422 2882




Solar Heating Sizing Guide
   Domestic Hot Water: 10 tubes per person
   Radiant Infloor Heating: 20 tubes per 200 sq. ft. area
   Swimming Pool Heating: 2-4 tubes per 10 sq. ft. area at 30-50% Coverage
   Hot Tub Heating: 50-75 tubes for up to 450 gallons

This is a general guide but there are several factors that affect the efficiency of a solar thermal
system:

   Insulation Level
   Shade
   Collector Orientation

These factors must be taken into consideration when designing the system.

Solar Water Heating Facts
    Combine heating applications to shorten payback period
    Solar heating systems reduce domestic hot water energy bills by 40% to 80% throughout
     the year
    Use your domestic hot water during the daytime to take advantage of the sun's energy
                                                                 Solar Water Heater
                                  http://www.ahbtechnology.com                Tel: +1 (613) 422-0888
                                  info@ahbtechnology.com                      Fax: +1 (613) 422 2882




Solar Heating Process Outline
   Solar Energy Absorption: Solar energy is absorbed by each tube and converted into thermal
    energy
   Solar Thermal Energy Transfer: The thermal energy is then transferred from the glass tube to
    the heat pipe by a heat fin via conduction
   Solar Thermal Energy Storage: The thermal energy is then transferred from the solar heating
    panel to a storage tank by a heating fluid that is pumped through the panel


Solar Water Heater system components
   Solar Collector
   Heat Exchanger Tank
   Pump
   Expansion Tank
   Controller

      The solar domestic hot water
system is completely automated and
can be set to heat water to any desired
temperature. Once the controller senses
that the desired temperature has been
achieved it stops the heating process.


Benefits of Solar Domestic Hot Water Heating
   Prolong the life of your existing water heater
   Costs less than an electric, gas or oil water heater
   No maintenance required
   Lasts longer than a traditional hot water heater
   Reduce your water heating costs
   Reduce your carbon footprint


Just by pre-heating cold water with free solar energy you can save between 50-80% of your
                                     water heating bill.
                                                                       Solar Water Heater
                                    http://www.ahbtechnology.com                       Tel: +1 (613) 422-0888
                                    info@ahbtechnology.com                             Fax: +1 (613) 422 2882




Solar Heating Process In Detail
1. Solar Energy Absorption: Solar energy is collected and converted into heat

The solar collector which is mounted on a roof or on the ground - with an angled bracket - is
responsible for collecting solar energy and converting it into heat in a matter of minutes. As the
sunlight passes through each evacuated tube, which is lined with an absorbing film, it is converted
into heat and conducted into a heat pipe which transfers the heat into a copper manifold.
Each evacuated tube is enveloped with a layer of vacuum between the 2 glass walls which prevents
heat from escaping into the atmosphere. This guarantees an optimum high heat transfer rate. This is
similar to a flask or double glazed window.

2. Solar Thermal Energy Transfer: Circulating fluids like water or glycol transfer
the heat from the manifold into a heat exchanger tank where water is heated.

In the heat exchanger tank the circulating fluid (or heating fluid) is circulated through an internal coil
heat exchanger where its heat is given off to the water inside the tank. The fluid then continues to
circulate back up to the collector where it is heated again. In the case of pool or hot tub heating the
heated fluid passes into a shell and tube heat exchanger where it gives off heat to the pool water. In
the case of infloor heating, the heat exchanger tank is replaced with a double coil heat exchanger
tank where the bottom coil is heated by the heating fluid and the top coil heats the infloor heating
water.

3. Solar Thermal Energy Storage: The heated water is stored

The heated water in the heat exchanger tank is heated and stored. When there is a demand for hot
water the solar heated water flows into the existing heating tank where it requires little or no
additional heating. When hot water is drawn from the top of the heat exchanger tank, cold water
make-up enters the bottom of the tank to be heated by solar energy. This allows for the storage of
twice the volume of hot water than the existing setup with one hot water heater.


Solar Pool Heating Process
Solar pool heating works in a similar fashion however the heating fluid transfers its heat to the pool
water via a heat exchanger. The heated pool water is stored in the pool itself. Cold pool water is
constantly drawn from the pool; heated in the heat exchanger and returned to the pool as hot water.
The use of a solar blanket is beneficial because it allows the pool to retain its heat at night.
                                                                      Solar Water Heater
                                   http://www.ahbtechnology.com                      Tel: +1 (613) 422-0888
                                   info@ahbtechnology.com                            Fax: +1 (613) 422 2882



Solar Radiant Heating
What is Radiant Heating?

Radiant floor heating is an excellent method of heating a space using hot water. The concept uses
conduction as well as radiation to heat your body instead of the air. Air, being a terrible conductor of
heat is much harder to heat and not to mention requires a lot of energy to heat. By heating the floor
and thus heating anything touching the floor a lot less energy is required.

The method is simple. Consider how the sun heats the earth. The sun’s energy radiates to the earth
where it is absorbed by the earth and released as heat. A radiant floor heating system works in the
same manner – heat radiates upwards from the floor. Floor heating works by circulating warm water
through plastic tubing under the floor.

This causes the floor to radiant heat thus warming a space and its occupants very comfortably and
efficiently.
                                                                    Solar Water Heater
                                  http://www.ahbtechnology.com                      Tel: +1 (613) 422-0888
                                  info@ahbtechnology.com                            Fax: +1 (613) 422 2882



Radiant Floor Heating Benefits
   No Cold Spots: Heat radiates from the entire floor thus, you get a warm floor and even heat
without any hot or cold spots.

  Silent: There is no noise produced by radiant floor heating. The water flows through the tubes in
the floor heating the space thus creating no noise whatsoever.

   Clean & Healthy: Radiant floor heating does not utilize radiators, ducts or fans to blow the heat.
This eliminates air born allergens, germs and dust from spreading throughout the house. It also
eliminates the need for air vents in the floor or the walls thus creating a cleaner look.

   Efficient: The radiant floor heating system operates at a low temperature (around body
temperature) and thus requires less energy than a forced air heating system. The heat is also evenly
distributed and thus reduces the length of time required to feel the warmth of the system.


How It Works
A solar thermal system can be used to pre-heat water for use in radiant or hydronic floor heating
systems. Solar pre-heat works for radiators and in-floor heating. The water, which is in a continuous
loop, is directed to a solar heat exchanger tank where it is heated by solar energy before it enters the
boiler.
This reduces the amount of energy used by the boiler by 20-40%.

A radiant floor heating system can also be used to heat domestic hot water simultaneously. This is a
more cost effective method as it utilizes one system for two different applications. The most common
method of combining both systems is by using a double coil heat exchanger tank as shown below.
One coil is used to absorb heat from the heating fluid and the other is used to heat the radiant heating
water. The space in between holds the domestic hot water (potable hot water) which is heating via
the the coil which contains the heating fluid.

The solar floor heating system is fully automated. The heating fluid is constantly circulated through
the collectors and the tank using solar energy. When there is a lack of solar energy the auxiliary
heating system switches on automatically to heat the water.
                                                                      Solar Water Heater
                                   http://www.ahbtechnology.com                      Tel: +1 (613) 422-0888
                                   info@ahbtechnology.com                            Fax: +1 (613) 422 2882



Installation
How long does the installation take?
It can take 1 to 2 days to install a domestic hot water system for a home or cottage.
A pool installation would take 3 to 4 days depending on the type of installation (ground or roof install).

How big are the collectors/will my roof withstand their weight?
A collector measures 6 feet wide and 6 feet long and weighs 170 pounds. It is mounted on the roof
flat against the shingles with 4 legs which attach to the trusses. The weight of the collector is well
within the Ontario building code.


How will the collector look on top of my house?
The collector is mounted flush with the slope of your roof. This is called a "flush mount". In some
cases it is difficult to see the collector on top of the house.


Would a roof installation cause any leaks?
The solar collectors are professionally installed on your roof ensuring no leakage occurs. An
installation warranty of 2 years is included. However, if your roof is in poor condition we would
recommend a ground installation if possible.


What if I am planning to replace my roof?
It is recommended that you replace your roof before having a solar collector installed. If you are
replacing your roof after your collector has been installed be sure to call a professional to detach the
collector before the roofers remove the shingles and replace it after they have completed their job.


Where should the solar collector be installed?
The collector should be installed in an un-shaded area. We would access the area prior to installing
the collector and determine the best location. Keep in mind that the location should be clear of any
shade caused by neighboring buildings or trees. In the winter the shadows are longer due to the low
position of the sun.
The collector should face anywhere in between south-west and south-east in order to absorb the
maximum amount of sunlight.


Can I install a system myself?
Yes, the solar collectors can be installed with ease. An instruction manual can be provided with each
system. It is recommended that a plumber or contractor oversee the installation to make sure that all
building codes are abided by.
                                                                     Solar Water Heater
                                  http://www.ahbtechnology.com                      Tel: +1 (613) 422-0888
                                  info@ahbtechnology.com                            Fax: +1 (613) 422 2882


Functionality
How does a solar domestic hot water system work?
A solar domestic hot water system works in two phases. First, solar energy is captured and converted
into heat. This is done by the solar collector. Thermal fluid, which resists freezing, is pumped into the
collector where it absorbs the heat. The second phase occurs in the heat exchanger tank where the
thermal fluid exchanges its heat to the water in the tank. Thus, the water in the tank is heated and
sent to the current heating system.

Does a solar domestic hot water system freeze in the winter?
In order to prevent any freezing a mixture of glycol and water is pump through the heat exchanger
coil and the pipes leading to and from the solar collector.

What happens if a tube breaks?
The tubes are very strong and do not break with ease. If a tube were to accidentally break due to
extreme circumstances, replacing one is quick and easy. The tubes are inexpensive and are readily
available.

Does a solar system produce hot water on a cloudy/overcast day?
Yes, the solar system will produce hot water however it will require the assistance of the current
electric or natural gas heating system to reach the desired set temperature.


Can a solar system work with my existing hot water system?
Yes, our solar system is most commonly installed in homes with current hot water systems.
Combining the two systems is very easy and is the recommended method of installation.
                                                                      Solar Water Heater
                                   http://www.ahbtechnology.com                       Tel: +1 (613) 422-0888
                                   info@ahbtechnology.com                             Fax: +1 (613) 422 2882


Frequently Asked Questions
Is there enough sunshine in Canada to heat water throughout the year?

Yes, there is plenty of sunshine in Canada for an evacuated tube solar collector. Unlike other solar
collectors the evacuated tube absorbs over 92% of the UV rays.

Can it withstand elemental forces such as high winds, hail and snow?

Yes, the collectors are designed to withstand high wind speeds and heavy snow fall. The glass tubes
can withstand hail stones up to 25mm (1in) in diameter

What about environmental issues?

A solar domestic hot water system reduces up to 1000 cubic meters of natural gas a year for an
average household. This is equivalent to 2.2 tonnes of greenhouse gas emissions. So, 1 DHW
system reduces up to 2.2 tonnes of greenhouse gas emissions a year for an average household.
The system can also be used in restaurants, malls, cottages and office buildings where it can reduce
even more greenhouse gas emissions.

How much money can I save?

With 1 domestic hot water system an average home (4-5 people) can save up to $600 a year on their
natural gas bill (given a rate of $0.50/cubic meter). If a household uses an electric water heater the
savings can be higher.
A solar pool heating system can save up to $1000 in pool heating costs per season. The money
saved can go towards throwing more pool parties and spending more time outdoors during the
summer. Not to mention the fact that a solar pool heating system extends your pool season by 2
months.
Businesses can save even more on their energy bills depending on their hot water demands. With the
rising cost of natural gas and electricity the savings will keep getting better.

Why should I install a solar water heating system?
    Reduce Energy Costs
     Whether you are a home owner or a business owner solar energy is free and will have a drastic
     effect on your energy bills. With the rising cost of energy whether, it is natural gas or electricity,
     consumers will look for a renewable and free source of energy. Wind and solar energy so far are
     the easiest to implement.

    Reduce Environmental Effects
     Reducing greenhouse gasses will slow down global warming as well as air and water pollution.
     Using solar energy will also reduce the demand for fossil fuels.

    Increase Property Value
     Property value will increase if a solar hot water system is installed.
                                                                     Solar Water Heater
                                   http://www.ahbtechnology.com                      Tel: +1 (613) 422-0888
                                   info@ahbtechnology.com                            Fax: +1 (613) 422 2882




Frequently Asked Questions
How much does a solar pool heating system cost?

The cost of an installed solar pool heating system depends on the size of the pool and where the
collectors are to be installed. For example, if the collectors must be installed on a roof then the
installation would cost more than if it were to be installed on the ground.
The number of collectors depends on the size of the pool. The more collectors are required the higher
the cost of the system.
For example, an average sized pool measures 10ft by 30ft and requires 4 collectors. This would cost
$4000. The pay-back period of this investment is between 1 and 2 years.

What if I am planning to renovate?

It is a good idea to let us know if you are in the process off, or are planning to renovate. There are
ways to save money on the installation if you will be having a contractor do the renovations for you.
We also offer free consultations with the contractor to assure the best and most efficient installation is
provided.

				
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