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Solar Water Heater

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Solar Water Heater

Solar Water Heater

Solar Water Heater

Solar Water Heating Systems

Introduction

Solar water heater consists of a collector to collect solar energy and an insulated storage tank to store water. The solar energy incident on the absorber panel coated with selected coating transfers the heat to the riser pipes underneath the absorber panel. The water passing through the risers get heated up and are delivered to the storage tank.

          The recirculation of the same water through absorber panel in the collector raises the temperature upto 68ºc + 5 ºc on a good sunny day. The total system with solar collector, storage tank and pipelines is called solar hot water system.

Based on the collector system, solar water heaters can be of two types:

  • Flat Plate Collectors (FPC) based Solar water heater where radiation is absorbed by Flat plate collectors which consists of an insulated outer metallic box covered on the top with glass sheet. Inside there is blackened metallic absorber with built in channels or riser tubes to carry the water. The absorber absorbs the solar radiation and transfers the heat to the flowing water.
  • Evacuated Tube Collectors (ETC) based Solar Water Heaters is made of double layer borosilicate glass tubes evacuated for providing insulation. The outer wall of the inner tube is coated with selective absorbing material. This helps absorption of solar radiation and transfers the heat to the water which flows through the inner tube.

 

Solar water heater is being used for heating water in homes, factories and other commercial and institutional establishments. It has life of 15-20 years.

By use of solar water heater of 100 litres capacity results in annual savings of app. 1250 units of electricity.

     At present there is no any subsidy is admissible on Solar Water Heating Systems. UPCL provides rebate of Rs. 100/- per month for 100 LPD Solar Water Heating System on electricity bills to consumers.

Below mentioned bar graph shows the yearwise installation of solar water heater and cumulative installation of solar water heater till date from         FY 2010-11 onwards.

Bar & Line Graph showing Cumulative and yearwise installation of Solar Water Heater and corresponding savings

ETC type Solar Water heater installed in University of Petroleum & Energy Studies, Dehradun. 

Detail of Year Wise Solar Water Heating Systems Installation in Uttarakhand

S.No.

Year

Capacity Installed in LPD

App. Area in Sq. Mtr.

1

1986-87

30200

604

2

1988-89

9600

192

3

1989-90

10900

218

4

1990-91

1700

34

5

1991-92

6700

134

6

1992-93

9500

190

7

1993-94

1700

34

8

1994-95

191400

3828

9

1995-96

1000

20

10

1996-97

1000

20

11

1997-98

2300

46

12

1998-99

6800

136

13

1999-2000

6900

138

14

2000-2001

8000

160

15

2003-04

13700

274

16

2004-05

12500

250

17

2005-06

42000

780

18

2006-07

68100

1222

19

2007-08

41400

771

20

2008-09

151200

3024

21

2009-10

193600

3372

22

2010-11

167425

2999

23

2011-12

316575

5224

24

2012-13

520300

8152

25

2013-14

520000

8211

26

2014-15

462000

7090

27

2015-16

503750

7575



3300250

54698

The Jawaharlal Nehru National Solar Mission (JNNSM)-one of the eight missions under National Action Plan on Climate Change was launched by the Prime Minister on 11th January 2010, which is a measure initiative of government of India and state govt. to promote ecological sustainable growth while addressing India’s energy security challenge. To promote off grid applications of Solar energy (both SPV & Solar Thermal) for meeting the target set in JNNSM, UREDA has installed a various capacity Solar Water Heating System under JNNSM. The categorize benchmark has been finalized by MNRE for 2013-14 is as below.

SI NO

Type of System

Category

Previous year benchmark cost Per sqm for 2012-13 (Rs/sqm )

New benchmark cost Per sqm for 2013-14 (Rs/sqm )

1.

Evacuated Tube Collectors (ETC)

Domestic

10000

8500

Commercial

10000

8000

2.

Flat Plate Collectors (FPT)

Domestic

11000

11000

Commercial

10000

10000