THERMAL ENERGY STORAGES - Stellenbosch University · THERMAL ENERGY STORAGES. Energy Storage...
Transcript of THERMAL ENERGY STORAGES - Stellenbosch University · THERMAL ENERGY STORAGES. Energy Storage...
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Werner Weiss
AEE - Institute for Sustainable Technologies (AEE INTEC)
A-8200 Gleisdorf, Feldgasse 19
AUSTRIA
THERMAL ENERGY STORAGES
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Energy Storage Capacity of a Water Storage (calc)
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Energy Storage Capacity of a Water Storage (calc)
1. Capacity of a domestic hot water storage?
2. Size of a seasonal storage for space heating?
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Combi System for a Single Family House
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Combi System for a Single Family House
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Combi System for a Single Family House
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Source: Jenni, CH
100% Solar Heated Houses
Multi family house Switzerland
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Storage tank for natural circulation systems
float valve
cold water inlet
hot water
outlet
overflow
pipe
collector
insulation
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Pressurised Storage Tank
Source: Chromagen
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1. Coating
2. Insulation
3. Steel tank
4. Enamel coating
5. Electric heating element
6. Sacrificial anode
7. Thermostat
8. Double Jacket Heat Exchanger
9. Cold water inlet
10. Hot water to user
11. Heat exchanger inlet
12. Heat exchanger outlet
13. Heat Exchanger Safety Valve
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Source: Easy Solar, South Africa
Hot water storage tanks (left) for direct
coupling of evacuated tube collectors
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Domestic hot water tank
Source: AUSTRIA EMAIL
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Different types of storage tanks
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Storage tanks with stratification devices
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cold water avoids convection SOLUTION:
Siphon: falling pipe should be 8 – 12 x pipe diameter
hot
hot
cold cold
cold cold
Heat
losses
Heat Losses
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Heat losses due to poor and missing
insulation
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10.000 m³ Pit Heat Storage Source: Leo Holm, Marstal Fjernvarme, Gleisdorf Solar 2012
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B
Source: Leo Holm, Marstal Fjernvarme, Gleisdorf Solar 2012
10.000 m3 pit heat storage
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Source: Leo Holm, Marstal Fjernvarme, Gleisdorf Solar 2012
10.000 m3 pit heat storage
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75.000 m3 pit heat storage
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Source: Leo Holm, Marstal Fjernvarme, Gleisdorf Solar 2012
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Source: Leo Holm, Marstal Fjernvarme, Gleisdorf Solar 2012
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Source: Leo Holm, Marstal Fjernvarme, Gleisdorf Solar 2012
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Different states of a membrane expansion
vessel
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Corded-tube heat exchanger (left)
plate heat exchanger (right)
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Coil heat exchangers
Corded tube heat exchanger ( top); smooth
tube heat exchanger (bottom) Smooth tube heat exchanger integrated in
a domestic hot water storage
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Calcification at a heat exchanger
(left picture) and at pipes (middle and right
picture)
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Domestic hot water-mixing valve
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Gravity break
Source: Gestra GmbH, Bremen
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Position of the different components in
the return line of the collector loop
Savety valve Lock valve Thermometer and Pressure gauge Circulation pump Filling valve Lock valve Gravity break
Empty valve Expansion vessel
Source: Streicher, W.:
Sonnenenergienutzung,
Graz, 2003
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Automatic air eliminators
Sources: Giacomini S.p.A, San Maurizio d’Opaglio, Italy and VOSS Holding
GmbH + Co. KG, Germany
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aufsteigende
Luftbläschen
Prallblech
(perforiert)
manuelle
Entlüftung
Strömungsrichtung
des Mediums
abgeschiedene
Luft
air deposit
rising air bubbles
flow direction
manually operated valve
metal grid
Manually operated air eliminator (left); Cyclone air
eliminator (right)
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Pumps, safety valves, controller
Source: WILO, Hanazeder Electronic GmbH, PKP Prozesstechnik GmbH
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Safety valve
Source: Deutsche Gesellschaft für Sonnenenergie: Solarthermische
Anlagen, Berlin 2000
plug
valve spring clip
membrane
application with valve seating
seal
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DIMENSIONING OF DOMESTIC HOT
WATER SYSTEMS
Hot water demand
Low demand (litres)
Medium demand (litres)
High demand (litres)
Residential buildings per person and day 30 50 60
Sport facilities per shower 20 30 50
Accommodation per bed 20 40 60
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Tilt angle for different latitudes and
seasons
Latitude
[degree]
Best collector tilt in:
June Orientation Sept./March Orientation December Orientation
50 N 26.5 S 50 S 73.5 S
40 N 16.5 S 40 S 63.5 S
30 N 6.5 S 30 S 53.5 S
20 N 3.5 N 20 S 43.5 S
15 N 8.5 N 15 S 38.5 S
10 N 13.5 N 10 S 33.5 S
Equator = 0 23.5 N 0 - 23.5 S
10 S 33.5 N 10 N 13.5 S
15 S 38.5 N 15 N 8.5 S
20 S 43.5 N 20 N 3.5 S
30 S 53.5 N 30 N 6.5 N
40 S 63.5 N 40 N 16.5 N
50 S 73.5 N 50 N 26.5 N
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Dimensioning of domestic hot water solar
systems for Central European and Southern
African conditions
Daily hot water demand
[litres]
Solar storage capacity [litres] Collector area* SC [m2]
100 200 4
200 400 6
300 500 – 750 8 - 12
500 750 - 1000 12 - 16
Daily hot water demand
[litres]
Solar storage capacity
[litres]
Collector area* SV [m2] Collector area* SC [m2]
50 50 – 75 1.0 – 1.5 0.9 – 1.3
100 100 – 150 2.0 – 3.0 1.5 – 2.5
200 200 – 300 3.5 – 4.5 3.0 – 4.0
300 300 – 450 4.5 – 6.0 4.0 – 5.0
500 500 - 750 7.5 - 10 6.0 – 8.5
*) depending on the required solar fraction
SV ... coating of solar varnish
SC ... selective coating