1. Jan-Feb 2011
SOLUTIONS Build It Yourself SOLAR WATER HEATER Text: Ar. Kalpana Bhandari The present scene of global energy crisis has successfully drawn the attention of the people surviving on it - and affecting it directly and indirectly. The hurdle for adaptations of innovative green technologies and to preserve the non-renewable resources, has become essential, especially in the urban cities. A green set-up with minimal interventions on natural cycle - the passive solar heater - is easy to understand and build. The following is a simple working model of a solar water heater developed by Ar. Debesh Bhattarai. WORKING METHOD: The working model is based on thermosyphon - a method of passive heat exchange based on natural convection which circulates liquid without the necessity of a mechanical pump. Its intended purpose is to simplify the pumping of liquid and/or heat transfer, by avoiding the cost and complexity of a conventional liquid pump – as simple as joining two ends in a pipe. WORKING MATERIALS: • High Density Polyethylene (HDPE), PVC or regular black pipe • A non-insulated water tank, • EPS Styrofoam board, • Base of bamboo base / brickwork / mild steel angle, • Plastic. WORKING MODEL CONSTRUCTION METHOD: The PVC pipes’ ends are used as cold water inlet and hot water outlet. The concentric pipes are tied as a helical spring to shape it like a saucer, with the outer fringe raised and the inner fringe lowered at an angle of 25 degrees, elevated at certain height from base on a stand made of bamboo, brick work or mild steel angle. The storage tank is insulated and the absorber has EPS Styrofoam insulation and plastic heavy gauge cover with a drain outlet in the middle. ANALYSIS AND COMPARISON The following table (observations taken in September, 2010) demonstrates the performance of this innovative solar water heater against the normal plated solar water heater: (A) Incomplete solar, without bottom insulation, and black Japan paint on pipes and top glazed cover Day Sky Condition Ambient water temp (~6-7pm) Solar Hot water reading Thermal gain in Celsius Minimum temp Maximum temp 1 Partly sunny 23.89 40.56 16.67 18.40 31.00 22.16 2 Cloudy 24.44 34.44 10.00 19.70 29.60 14.74 3 Partly sunny 23.33 41.11 17.78 19.50 31.40 21.61 4 Cloudy throughout 21.67 31.11 9.44 19.70 27.00 11.41 6 Sunshine 21.67 38.89 17.22 20.00 29.50 18.89 Thermal gain wrt minimum temp www.spacesnepal.com 32 January-February 2011
SOLUTIONS (B) Complete solar, with insulation, black Japan paint on insulation top and pipes with top glazed cover of heavy gauge plastic sheet: Day Sky Condition Ambient water temp (~6-7pm) Solar Hot water reading Thermal gain in Celsius Minimum temp Maximum temp 14 Cloudy throughout 21.39 32.78 11.39 19.90 25.70 12.88 15 Cloudy throughout 20.00 27.50 7.50 19.50 23.50 8.00 partly rain 16 Intermittent sunshine 22.22 41.11 18.89 18.40 29.40 22.71 after 12:45 pm 17 Good Sunshine 23.33 46.67 23.33 18.00 29.20 28.67 Thermal gain wrt minimum temp COSTING: • The cost of the solar is Rs. 16,500. Its breakdown is as follows: o Mild steel tank 12 gauge 200 liter capacity = Rs. 7200, o Glass wool insulation with aluminum sheet o cover = Rs. 4100, Solar heat absorber panel with plastic sheet cover and styrofoam insulation = Rs 4100, o 1/2"stop cock 3 nos = 1100. approximately, • Replacing MS tank with 200 litre plastic drum, the cost of the solar shall be around Rs.12000. • For a solar water heater of 200 litres capacity, the vacuum tube solar water heater costs almost 8 times and normal plate solar water heater costs almost 5 times more than this innovative passive solar water heater. Innovative solar water heater is simplified and has an easy-to-install mechanism to host the necessity of hot water, especially in areas where there persists difficulty in sustaining low temperature, and also for prolonged usage of renewable energy and to conserve the non renewable energy. Similar simple mechanisms have been practiced all over the world, and most of them are practical in places where development and infrastructures are either limited, or haven’t been ever implemented. (Reference: study and experiments carried out by Architect Debesh Raj Bhattarai for GE Ecomagination Challenge, You Tube link http://www.youtube.com/ watch?v=EYytBzfrrw4) January-February 2011 33 www.spacesnepal.com
- Page 1: JANUARY - FEBRUARY 2011 ART - ARCHI
- Page 12: INBOX C ongratulations on a wonderf
- Page 16 and 17: CONTRIBUTORS Ar. Kai Weise Ar. Yatr
- Page 18 and 19: www.spacesnepal.com 18 January-Febr
- Page 20 and 21: NEWS and HAPPENINGS Chagall in Nepa
- Page 22: NEWS and HAPPENINGS Upcoming Exhibi
- Page 26: INFOCUS • Required certificates a
- Page 29 and 30: SOLUTIONS Despite a high level of g
- Page 31: SOLUTIONS Hand pump Gutter Down Pip
- Page 36 and 37: SOLUTIONS Reduce your by30% Buildin
- Page 38 and 39: ARCHITECTURE The sun does not just
- Page 40 and 41: ARCHITECTURE From the flood plains
- Page 42 and 43: ARCHITECTURE The warmth at the entr
- Page 44 and 45: ARCHITECTURE The panorama of Thasan
- Page 48 and 49: ARCHITECTURE THE COURTYARD HOUSES O
- Page 50 and 51: ARCHITECTURE In the ancient kingdom
- Page 52 and 53: ARCHITECTURE VARIATIONS IN LAYOUTS
- Page 54 and 55: ARCHITECTURE First concrete buildin
- Page 56 and 57: INTERNATIONAL Resort World Sentosa
- Page 58 and 59: INTERNATIONAL Resorts World TM Sent
- Page 60 and 61: INTERNATIONAL The interiors of the
- Page 62 and 63: INTERIOR Where Context Meets Contex
- Page 64 and 65: INTERIOR The staircase, guided by f
- Page 66 and 67: INTERIOR Details and details The id
- Page 68: The three storey building envelope
- Page 71 and 72: HERITAGE The Area of Maru, with Mar
- Page 73 and 74: HERITAGE SITE PLAN: Kathmandu Darba
- Page 75 and 76: HERITAGE The Kumari Bahal built in
- Page 77: HERITAGE The royal thrones used for
- Page 80 and 81: ANALYSIS This time around the propo
SOLUTIONS<br />
(B) Complete solar, with insulation, black Japan paint on insulation top and pipes with top glazed cover of heavy gauge plastic sheet:<br />
Day Sky Condition Ambient water<br />
temp (~6-7pm)<br />
Solar Hot water<br />
reading<br />
Thermal gain<br />
in Celsius<br />
Minimum<br />
temp<br />
Maximum<br />
temp<br />
14 Cloudy throughout 2<strong>1.</strong>39 32.78 1<strong>1.</strong>39 19.90 25.70 12.88<br />
15 Cloudy throughout 20.00 27.50 7.50 19.50 23.50 8.00<br />
partly rain<br />
16 Intermittent sunshine 22.22 4<strong>1.</strong>11 18.89 18.40 29.40 22.71<br />
after 12:45 pm<br />
17 Good Sunshine 23.33 46.67 23.33 18.00 29.20 28.67<br />
Thermal gain wrt<br />
minimum temp<br />
COSTING:<br />
• The cost of the solar is Rs. 16,500. Its<br />
breakdown is as follows:<br />
o Mild steel tank 12 gauge 200 liter capacity<br />
= Rs. 7200,<br />
o Glass wool insulation with aluminum sheet<br />
o<br />
cover = Rs. 4100,<br />
Solar heat absorber panel with plastic<br />
sheet cover and styrofoam insulation = Rs<br />
4100,<br />
o 1/2"stop cock 3 nos = 1100.<br />
approximately,<br />
• Replacing MS tank with 200 litre plastic drum,<br />
the cost of the solar shall be around Rs.12000.<br />
• For a solar water heater of 200 litres capacity,<br />
the vacuum tube solar water heater costs<br />
almost 8 times and normal plate solar water<br />
heater costs almost 5 times more than this<br />
innovative passive solar water heater.<br />
Innovative solar water heater is<br />
simplified and has an easy-to-install<br />
mechanism to host the necessity of<br />
hot water, especially in areas where<br />
there persists difficulty in sustaining<br />
low temperature, and also for prolonged<br />
usage of renewable energy and to<br />
conserve the non renewable energy.<br />
Similar simple mechanisms have been<br />
practiced all over the world, and most<br />
of them are practical in places where<br />
development and infrastructures are<br />
either limited, or haven’t been ever<br />
implemented.<br />
(Reference: study and experiments carried<br />
out by Architect Debesh Raj Bhattarai for GE<br />
Ecomagination Challenge,<br />
You Tube link http://www.youtube.com/<br />
watch?v=EYytBzfrrw4)<br />
<strong>Jan</strong>uary-<strong>Feb</strong>ruary <strong>2011</strong><br />
33<br />
www.spacesnepal.com
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