The solar thermal water
heating is now a temperamental thing. Water has a lot of weight, it expands
when it freezes and it caused a severe damage to the pipes when it boils. On
the other hand, the solar thermal systems are wonderfully efficient and many of
the systems are able to work perfectly for over the decades but if the regular
inspection is given to them. When the solar thermal system fails and it has
been clear to some point of time that the solar thermal water heating is
expected for the very-low heat usage like the solar pool heating companies are offering.
For a long time, the wisdom
has been shown the relative efficiency advantage of the solar thermal
technology for the water heating which outweighs availability of the electric
water heating. The capacity of the solar thermal to collect more energy is
powering a conventional electric water heater alone with the solar thermal
system.
There have been reductions
in the solar electric (PV) costs and there has been a maturation of
air-to-water heat pump technology as well, which have provided a new model
which is solar-electric assisted heat pump water heating that has the fewest
drawbacks other than the solar thermal.
PV
Advantages
Lower
cost
– we have seen that the lowest cost has open the system with a proven results
for the domestic water heating where the installation cost of the solar thermal
has to based on the closed loop with the two tank system and has to be fully
installed as well. The average cost for this system has to be designed for the
family of four in a minimum range of the price tag for the residential
applications.
The use of a heat pump water
heater with an efficiency factor for about EF of 2.5 and an 1,800 kWh per year
rating where the grid of 1 to 1.3 kW of PV has been added to an existing
installation system in a region.
Easier
to install – A water heater can be replace by another single tank
and you can add three to five additional modules in the PV system is really convenient
instead of replacing the two tanks and the pipes, where the heat transfer fluid
to the heavy rooftop should be pressure tested and has to be charged after
installation. This can be result in less opportunity for the installation
errors to be taken place.
Less
space usage – the solar thermal system requires a backup
source where the two tanks are required, the one for the backup and the other
one is for the solar system. You cannot save the space, while eliminating the
usage of tank heaters as long as the tank heater can regulate the heat flow to
the really low point as well in order to meet maximum demand.
Low maintenance – Even when
the solar thermal system has stopped working, but it does not fail to produce
the energy. The electronic controller and the circulator pumps have to be
inspected on the yearly basis, which assure that they are functioning properly
and there should not be any scale of the system corrosion which may lead to the
system failure.
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