WSE is proud to introduce our solar domestic water system designed and manufactured in Canada for Canadian climates.We designed it to work in Saskatchewan so it will operate anywhere.
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Solar hot water is one of the most immediately cost-effective uses of renewable energy.
Hot water represents the second largest energy consumer in Canadian households.
A typical 300 liter electric hot water tank serving a family of four will consume approximately 160 million BTUs in its seven year lifetime. This will cost approximately $3,600 CDN(at $0.08 per KWH), not accounting for fuel cost increases. An investment in a solar water heating system will beat the stock market any day, any decade, risk free. Initial return on investment is on the order of 20 percent, tax free, and goes up as gas and electricity prices climb. Many provinces have tax credits and other incentives to sweeten those numbers even more. What are we waiting for? Forget the stock market. If you have invested in a house, your next investment should be in solar hot water. |
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How Large a Solar Hot Water System Do
You Need?
Hot water usage in the Canada is typically 55–110 liters
per person per day for home use. This
includes primarily bathing, clothes washing, and dishwashing.
But your commitment to efficiency has a lot to do with your
actual usage.
The hot water tank is usually sized to handle one day’s
worth of consumption. So for a household of four, it would
be reasonable to use an 300 liter tank based on daily hot
water requirements of 75 liters per person per day.
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OVERVIEW
In our basic solar heating system, freeze protection
is accomplished with use of a non-toxic antifreeze solution
in the collector loop. This fluid is circulated from
the collectors through a heat exchanger to transfer
the heat into a domestic hot water storage tank or dissipated
through various applications. The antifreeze is contained
within a closed loop, so it never mixes with the domestic
water.
These solar collector loops are set up very similar
to conventional closed loop hydronic heating systems
in your homes, which circulate heated fluid from a boiler
throughout in floor pipes within your home. All components
used in solar heating systems are generally recognized
by plumbing and heating contractors.
SOLAR PRODUCTION
To collect the suns energy and convert it into a
heated fluid, 2- WSE 58 evacuated tube collector
panels are used. 2 panels will produce approximately
5200 btu/hour in full sunlight. Flexible copper
lines are used to join the collectors together and
are also used for transferring the heated fluid
from collectors to storage part of the system. For
maximum efficiency, all lines that carry fluid should
be properly insulated.
Note: Your application may require more or fewer
panels. |
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Making the Most of Solar Energy
To make the most of the energy collected using
the solar hot water system, the user should be
aware of a few items. Solar energy production
only happens as the sun shines. The time at which
the maximum amount of solar energy is stored in
the hot water tank is mid to late day. With this
in mind, you can save the most amount of money
(by using the solar energy) by limiting your use
of hot water in the morning. Washing dishes, clothes
and yourself will make the most of the free hot
water in mid to late day.
It should also be noted that your regular hot
water heater should be set to produce very little
heat at the start of the solar day. If the hot
water tank is allowed to continuously heat at
the same time as the sun shines, you will not
be able to transfer much of the suns energy into
the tank, and most of the time, the heat will
be bypassed through the dissapator, rather than
transferred into the hot water tank.
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DIFFERENTIAL CONTROL
To maximize the energy we get when it’s needed
and available, we use the WSE solar controller to
measure the suns energy and simultaneously measure
the fluid temperature in the storage tank using
thermistors. When there is sufficient energy in
the collectors to add heat to the storage fluid,
this differential controller starts your circulation
pump and transfers the heated fluid to a storage
tank or a heat exchanger. Controllers come with
3 temp sensors which allow users to monitor system
temperature within solar collectors as well as storage
tank temperatures. |
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CIRCULATION
Circulation Pumps are needed to transfer heated
fluid from collectors to a means of storage or dissipation.
Pumps are turned on and off by a differential controller.
Pumps should be placed so they are pumping the coldest
fluid in the system. The coldest collector loop
is found after it has been circulated through the
heat exchanger. Pumps should always be mounted so
that the impeller shaft is horizontal. |
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HEAT EXCHANGER
The flat plate heat exchanger shown here is a liquid
to liquid exchanger installed externally on a standard
hot water tank. The purpose is to transfer heat
from the solar heated fluid to the domestic water
within the tank. Flat plate heat exchangers are
very compact and very efficient. Many plates are
sandwiched together with very small passages between
each plate. One fluid is pumped through one WSE
Technologies Domestic Hot Water side of each plate,
and the second fluid through the other side. The
heat exchanger shown here has been plumbed in parallel
with the tank, the lower inlet of the exchanger
connected to the bottom of the tank and the exchanger
outlet leading to the upper part of the tank. When
the hotter fluid on the solar half of the exchanger
transfers it heat to the opposing side of the exchanger,
a natural thermo siphon is created between the tank
and exchanger. This thermo siphon draws the cooler
water from the bottom of the tank, through the heat
exchanger, and returns it to the top of the tank. |
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PRESSURE
The expansion tank is placed downstream from the
heat exchanger, near the circulating pump, therefore
on the the cold side of the loop. Pressure gauge
is recommended to monitor system pressure and can
be a direct indication of leaks. A pressure guage
that registers in the range of 0-100 psi is adequate.
It is always recommended that a pressure relief
valve be installed in the system to protect the
closed loop piping. A pressure relief valve rated
at 50-75 psi is usually adequate. This valve is
installed at the highest point in the system at
the outlet of the collector(s). Automatic or coin
vents must also be installed in the system. Vents
are installed at the highest point, usually at the
outlet of the collectors to allow air to escape. |
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DRAIN/FILL VALVES
Two drain valves need to be installed for purging
and filling of the system. A check valve has been
installed between the two valves. These drains are
also used for future maintenance of the collector
loop fluid. These valves have been installed downstream
from the heat exchanger and just below the circulation
pump. |
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WSE 4000 MOTORIZED VALVE
The purpose of this component is to direct the
heat fluid through either the heat exchanger or
the dissapator. The valve remains passive under
normal operating temperatures, allowing fluid
to flow through the heat exchanger, thereby heating
the water in the hot water storage tank. It becomes
active and diverts flow through a dissipater when
set temperatures have been achieved within the
storage tank. It acts as a high limit control,
activated by the differential
controller to prevent overheating of storage tank.
This valve can also be incorporated for purpose
of zoning heat to different areas of a building,
using a timer or thermostat.
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WSE SOLAR DISSIPATER
The Solar Dissipater is installed in the system
to dump excess heat that is being produced within
the solar loop when storage tank has reached max
temperature setting or during periods
of non-use. This protects systems from overheating.
As the collector fluid passes through the dissipater,
heat is dissipated via aluminum fins to surrounding
air; the vertical fin arrangement
promotes passive air current.
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Ready to order or have some questions?
Simply pickup the phone and call 1 306 244 8808
(Barry ext 242 ) ( Brayden ext 239) (Lee ext 232)
If you need more information, you have two options
Click here to Contact the Dealer near you
OR
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Linda 1 306 244 8808 ext 226 or Email
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WSE Technologies
303 - 47Str. E
Saskatoon
Saskatchewan
Canada
S7K 5H2
Ph: 1 306 244 8808
Fax: 1 306 244-9970
We accept Visa and Master card.
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