Solar
Water Heater – With the spiraling
cost of electricity this healthy
alternative to heating water not
only saves money but also runs for
a long, long time. Venus has introduced
vacuum tube technology in Solar
water heaters for the first time.
INTRODUCTION
TO VENUS (VTC) ADVANCED TECHNOLOGY
We at Venus believe
in bringing the benefits of the
latest technology to our consumers.
Now, in Solar Water Heaters too
Venus introduces “Vacuum tube
collectors” for the time in
India. Internationally renowned
& accepted, this technology
is superior to other prevalent systems
in performance, reliability &
ease of installation. Breakthrough
technology that taps the unlimited
power of the sun to give you enormous
energy savings year after year.
Working
of Venus VTC Solar Water Heater
The Venus Vaccum Tube Collector
solar water heater is made up of
rows of parallel, transparent glass
tubes. Each tube consists of a glass
outer tube and an inner tube, or
absorber, covered with a selective
coating that absorbs solar energy
well but inhibits radioactive heat
loss. The air is withdrawn ("evacuated")
from the space between the tubes
to form a vacuum, which eliminates
conductive and convective heat loss.
The Vacuum tube collector abosrobs
the heat from the solar radiation
& heats up the water stored
in the system through the Thermosiphonic
effect.
What
is Thermosiphonic Effect
A thermosiphon system relies on
warm water rising, a phenomenon
known as natural convection, to
circulate water through the collectors
and to the tank. In this type of
installation, the tank must be above
the collector. As water in the collector
heats, it becomes lighter and rises
naturally into the tank above. Meanwhile,
cooler water in the tank flows down
pipes to the bottom of the collector,
causing circulation throughout the
system. This is called Thermosiphonic
Effect. This process continues steadily
for a numer of hours till the water
stored in the tank is heated up.
Very high Temperatures upto 80-85
deg C can be had from such a system.
The water heated in this manner
is stored overnight in the insulated
storage tank and is available for
use the next day.
FEATURES
OF VENUS VACCUM TUBE COLLECTOR
(VTC) MODEL
Heating from infrared
rays of solar radiation
Greater absorption
area per day
Greater absorption
time per day
Minimum heat loss
from the system due to the
vacuum tubes & PUF insulated
storage tank
Better performance
in winter & on cloudy
days. Up to 10oC higher
temperature
Maintance free, easy
to clean
Compact size - low
height & lesser space
required for installation.
Inner tank and outer
tank body are made from SS304
superior grade stainless steel
to withstand corrosions and
to last a life time
Installation
Requirements
Unobstructed sunlight
on a flat or slopping roof
Shadow-free area
Close to the bathrooms
to avoid long piping &
heat losses
A water tank at a minimum
of 2.5m (7 ft) above roof
level
The solar collector
tubes facing south.
Usage
Besides individual houses, the
VTC solar water heater is also
ideal for schools, hostels,
hotels, dairies, breweries,
canteens and industries like
automotive, fertilizer, chemical,
textiles, pharmaceuticles, etc.
Description
110
LPD
200
LPD
Capacity
110
litres
200
litres
Inner
Tank
SS
304, Tig Welded
SS
304, Tig Welded
Outer
Casing
SS
304, Tig Welded
SS
304, Tig Welded
Insulation
CFC-Free
Polyurethane Foam
(50 mm thick)
CFC-Free
Polyurethane Foam
(50 mm thick)
Pipe
Connection
3
/4" SS Pipes
3
/4" SS Pipes
Backup
Electric Heating
1.5
kw heating element with
thermostat
1.5
kw heating element with
thermostat
No
. of Vacuum Tubes
18
nos.
28
nos.
Rated
Working Pressure
0.05
Mpa
0.05
Mpa
Guarantee
for Tank
5
Years
5
Years
Dimensions
(In mm)
Model
A
B
C
D
E
F
G
110
Ltrs
1140
1640
1490
420
1260
1590
1680
200
Ltrs
1190
1700
1490
470
1950
2180
2250
Features
Superiorty Of
Vacuum Tube Collector Technology
Vacuum
tube collector
Flat
Plate collector
1. Heat absorptions
from the infrared rays of solar
radiation instead of the visible
light rays, so during winter
and cloudy days, the system
absorbs infrared rays as usual.
Heat absorption
occurs from the visible light
rays, On cloudy days performance
will be affected significantly.
2. Heat absorbing surface
is always perpendicular to
sunlight because of spherical
collectors
Heat absorption
surface will be perpendicular
to sunlight only for a short
time.
3. Heating continues till
late evening
It falls down
after 2 p.m
4. It gives 10
o C higher temperature of hot
water in winter & Cloudy
days.
It is not possible
in FPC as heating efficiency
falls significantly on cloudy
and winter days.
5. The vacuum
inside the collector tubes vastly
reduces overnight heat loss
Heat loss will
be more at night from collector
panels.
6. Salt or scale
formation when using hard water
will be reduced
Scale formation
will be more and may choke the
narrow pipes within the collector.
7. Scale deposits
slide off the smooth glass walls
to accumulate at the bottom
from where they can be easily
removed.
Once the scale
deposits are formed it stops
the flow of water; the removal
of scale is also some what difficult.
8.
Installation of the system is
very easy
Installation
of the system is not easy as
VTC
9. Area required
for installation will be very
less
It require more
area compared to VTC
10.Incase of
damage to the collector tubes,
individual tube can be replaced.
But here entire
flat plate has to be replaced
and it involves high cost for
replacement.
Energy
Savings
Model
Total
cost of Solar Water Heater
***
Cost
of Electric Water Heater
*
Difference
Annual
Saving
** in Electricity
Pay
back Period.
KWH
(
Rs.)
110 LPD
Rs. 22,500
Rs. 9,800
Rs. 10,000
1,200
5,000
22 months
*One
110 LPD Solar Water Heater replaces
2 Nos. 25Lts, Electric Water Heater
**Calculated at tariff rate of Rs.4.50/KWH
assuming usage of Solar Water Heater
for 300 days/year
*** Cost Includes Installation &
delivery
FAQS
1.Is
it very expensive?
When compared to an electric
heater the Venus solar heater may
sound slightly expensive. But a solar
heater will pay back its investment
in 2-3 years, through recurring energy
savings.Besides with the government
push towards tapping solar power you
can avail easy loans from nationalized
banks at nominal interest rates. You
may also be eligible for rebates on
your electricity bills in some states.
2.What
could happen if water supply is
irregular?
Incase cold water
supply is interrupted during the
day , the heating of water by the
solar system may not be affected
significantly, although hot water
cannot be drawn for use till the
water supply is restored.
3.Will I get power
and hot water from this system?
No, Solar hot water
panels only heat water. They do
not generate electricity from sunlight.
As the sun hits the glass tubes
in the panel, water gets heated
and flows back into the tank. Solar
electric panels are made of silicon
and convert sunlight directly into
electricity. They are different
from solar hot water panels.
4.What will happen
on cloudy days?
The VTC model solar
water heater will continue to function
even on cloudy days due to heat
absorption from the infrared rays
of sunlight. Efficiency would be
affected, however, on rainy days.
5.Can I get
hot water during early morning when
sun is not there?
Hot water produced
by the solar system during the day
is stored in an insulated storage
tank. The insulation of the tank
is such that the water remains hot
without significant drop in temperature
for around 24 hrs. Thus water heated
during the previous day is available
for use the next morning.
6.What
are the Maintenance requirements?
Venus VTC solar
water heating systems do not need
significance maintenance. The collector
tubes may need annual cleaning to
remove accumulated scale and sediment
deposits at the bottom. The system
is resistant to adverse effects
of weather as it is made of stainless
steel.
7.Can
I use Hot water from the solar water
heater in the evening or night?
Using the Hot water
in the evening or night will result
in hot water being unavailable the
next morning as the system will
not heat water overnight. If you
wish to use hot water in the evening
too, then choose a larger capacity
of solar water heater that meets
your needs.
8.What is the
expected life of a solar water heater?
Venus VTC solar
water heaters can last for 15-20
years depending upon the general
upkeep.
Model
Selection Guide
Domestic
Use :
Model
Capacity
No:of persons
No: of outlets
110 LPD
110 liters
Up to 4
2
200 LPD
200 liters
Up to 8
4
BANKING
FOR HIGHER CAPACITY
We
can bank individual systems to get
higher capacity by connecting the
systems in series, parallel or series/parallel
combinations as shown below. For example
to get 1100 LPD, we can bank 10 *
110 LPD systems in series or parallel
to get 1100 LPD capacity. More than
1100 LPD is also possible by similar
way of banking. This type of banking
will be suitable for meeting the larger
requirements of hotels, hostels, hospitals,
resorts etc.
APPLICATIONS:
Besides
individual houses, the VTC solar water
heater can also be used for Schools,
Hostels, Hotels, Dairies, Breweries,
Canteens and Industries like Automotive,
Fertilizer, Chemical, Textiles, Pharmaceuticals
etc.
Brouchure
Download
our Solar Brand Venus water heater
Brouchure
Heating from infrared
rays of solar radiation 
