Two worlds in solar water heating: Draft results of a recent global best practice study for the Central Energy Fund

8/9/2019 Two worlds in solar water heating: Draft results of a recent global best practice study for the Central Energy Fund

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Michael Grupp (Synopsis) - EEDAL '06 1

Two worlds in solar water heating -

Draft results of a recent global best-

practice study for the Central Energy

Fund (PTY Ltd)

Michael Grupp, Joan Beall, Hannelore Bergler (Synopsis,

Lodve, France)

Marlett Balmer, Mmathabo Murubata (PDC, Pretoria, RSA)


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Table of contents

SWH for South Africa: import or local production ?

Data base of offers from 13 (out of 29) countries

Analysis of prices and models

Recommendations for incentives without regrets

Remarks on virtual feed-in


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SWH market - supply and demand issues

Supply:

Who wants to export to South Africa ?

Types proposed for export

Prices and conditions Comparison with locally produced models

Demand:

SWH types adapted to the South African market

Income categories and the corresponding SWHtypes


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The Solar Water Heater Types

historically, there was diversity: split systems,

monoblocs, integrated SWH, glazed, unglazed

today, only a few types have survived: splits and

mono-blocs

differents versions of these are available

ISWHs have retired to niches


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The global Solar Water Heater market

Two worlds:

Low-price countries (Group A): mainly simple

small gravity flow, open-loop systems

High-price countries (Group B): all system

types, but mainly sophisticated large, pumped,

closed-loop and expensive systems


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The top seller: the vacuum tube mono-bloc


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The Garden Shower


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The wheel-barrow water heater


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The Shower bag


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The SOLVIS solar heater/sanitiser


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The solar heater/sanitiser - instructions


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Collector aperture and tank volume

Collector aperture distribution (all systems)

0

5

10

15

20

25

30

35

40

0 1 2 3 4 5 6 7 8 9 10 11 12

aperture m

Group A B A/B B/A

S m 3,8 4,1 0,93 1,08

V litre 225 258 0,87 1,15

Tank volume distribution (all systems)

0

5

10

15

20

25

30

35

40

0 5 0 100 150 200 250 300 350 400 450 500 550

tank litres


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Ex-factory prices - high (Group B) and low-

price countries (Group A)

Group A B A/B B/A

Price 626 1809 0,35 2,89Price/m 176 461 0,38 2,62

Price/litre 2,9 6,8 0,43 2,34


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Retail prices - high and low-price countries

Retail prices Group A and B

0

5

10

15

20

0 1000 2000 3000 4000 5000

Euros

Group B

Group A


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Ex-factory prices : order of 100 units

Ex-factory price per unit (100)

0

5

10

15

20

0 500 1000 1500 2000 2500 3000

Euros


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Ex-factory prices per m of collector aperture:

- South Africa and the rest of the world -

Ex-factory price per m collector area (100)

0

5

10

15

20

0 100 200 300 400 500 600 700 800

Euros


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The virtual electricity feed-in by SWH

We all know: feed-in laws cant be applied for heat.

Or can they? In the RSA, SWH mainly replace

electricity in "geysers". Use of a SWH therefore isequivalent to the production of electricity (one could

call this "virtual" electricity feed into the grid)

Why not apply the successful German feed-in law?


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The CEF Solar Water Heater Study

Thanks to CEF/EDC

Documents

Two worlds in solar water heating: Draft results of a recent global best practice study for the Central Energy Fund