ggineeringCivil Engment of CDepartm

Civil Enment of CDepartm

Ziqian Chen

Ziqian Chen

•• D D ^escription escription of solar collectors of solar collectors

•• A A ^nalysis nalysis of the highest temperature of the of the highest temperature of the p

p

A

A ^nalysis nalysis of the highest temperature of the of the highest temperature of the solar collectors

solar collectors

•• C C C C ^{onclusions onclusions onclusions onclusions}

Introduction

Introduction

Introduction

Introduction

The maximum temperatures in the period

between May 1 and September 30 in three

between May 1 and September 30 in three

different solar collectors from Sunda Co. are

determined by theoretical calculations under

Danish weather conditions. The collectors are

Danish weather conditions. The collectors are

SEIDO 1-16, SEIDO 5-16 and SEIDO 10-20.

D

Description escription of solar collectors of solar collectors D

Description escription of solar collectors of solar collectors

0.6 0.7

(-)

0 3 0.4 0.5

iciencyη(

0 1 0.2 0.3

Effi

0 0.1

0 0.05 0.1 0.15 0.2 0.25

T_m*(K m²/W)

Efficiency curve of SEIDO 1 16 for a solar irradiance of 800W/m² Efficiency curve of SEIDO 1-16 for a solar irradiance of 800W/m²

The transversal incidence angle modifier for SEIDO 1-16 is: g

The longitudinal incidence angle modifier for SEIDO 1-16 is:

1 1.2

M (-)

0.6 0.8

versal IAM

Measured data

0.2 0.4

Transv ^{e su ed d}

Fitting curve

0

0 20 40 60 80

Incidence angle (^oC)

Measured data and fitting curve of transversal IAM for SEIDO 1-16

1 1.2

M (-)

0.6 0.8

udinal IAM

Measured data

0.2 0.4

Longitu

Fitting curve

0

0 20 40 60 80

Incidence angle (^oC)

Measured data and fitting curve of longitudinal IAM for SEIDO 1-16

0 5 0.6 0.7

η(-)

0.3 0.4 0.5

Efficiencyη

0 0.1

E 0.2

0 0.05 0.1 0.15 0.2 0.25

T_m*(K m²/W)

Efficiency curve of SEIDO 5-16 for a solar irradiance of 800W/m²

The transversal incidence angle modifier for SEIDO 5-16 is: g

The longitudinal incidence angle modifier for SEIDO 5-16 is:

1 1.2

AM (-)

0.6 0.8

nsversal IA

Measured data

0 0.2 0.4

Tran

Fitting curve

0

0 20 40 60 80

Incidence angle (^oC)

Measured data and fitting curve of transversal IAM for SEIDO 5-16

1.2

0.8 1

AM (-)

0 4 0.6 0.8

gitudinal IA

Measured data

0 0.2 0.4

Long

Fitting curve

0

0 20 40 60 80

Incidence angle (^oC)

Measured data and fitting curve of longitudinal IAM for SEIDO 5-16

0.5 0.6

η(-)

0 2 0.3 0.4

Efficiency

0 0.1 0.2

0 0.05 0.1 0.15 0.2 0.25

T_m*(K m²/W)

Efficiency curve of SEIDO 10-20 for a solar irradiance of 800W/m²

The transversal incidence angle modifier for SEIDO 5-16 is: g

The longitudinal incidence angle modifier for SEIDO 5-16 is:

1 1.2

(-)

0.6 0.8

ersal IAM

Measured

0.2 0.4

Transve _Measured

Fitted

0

0 20 40 60 80

Incidence angle (^oC)

Measured data and fitting curve of transversal IAM for SEIDO 10-20

g ( )

1.2

0.8 1

AM (-)

0 4 0.6 0.8

gitudinal IA

Measured

0 0.2 0.4

Long _Fitted

0

0 20 40 60 80

Incidence angle (^oC)

Measured data and fitting curve of longitudinal IAM for SEIDO 10-20

A

Analysis nalysis of the highest yy of the highest temperatures gg temperatures p p of

of the solar collectors the solar collectors

Highest temperatures of solar collector for different azimuths and tiltsg p for SEIDO 1-16

Contour of the highest temperatures of solar collector for different Contour of the highest temperatures of solar collector for different azimuths and tilts for SEIDO 1-16

240 250

ture (o C)

230

temperat

210 220

Highest

200

0 30 60 90

Tilt (^o)

Highest temperatures of the solar collector, SEIDO 1-16, for different

i h d i h ll il f 0

( )

azimuths and with a collector tilt of 0^o

Highest temperatures of solar collector for different azimuths and tiltsg p for SEIDO 5-16

Contour of the highest temperatures of solar collector for different Contour of the highest temperatures of solar collector for different azimuths and tilts for SEIDO 5-16

210

ture (o C)

190 200

temperat

Highest 180

170

0 30 60 90

Tilt (^o)

Highest temperatures of the solar collector, SEIDO 5-16, for different

i h d i h ll il f 0

Tilt ( )

azimuths and with a collector tilt of 0^o

Highest temperatures of solar collector for different azimuths and tiltsg p for SEIDO 10-20

Contour of the highest temperatures of solar collector for different Contour of the highest temperatures of solar collector for different azimuths and tilts for SEIDO 10-20

220 230

ature (o C)

210

t tempera

190 200

Highest

180

0 30 60 90

Tilt (^o)

Highest temperatures of the solar collector, SEIDO 10-20, for different

i h d i h ll il f 0

( )

azimuths and with a collector tilt of 0^o

C l i C l i

Conclusions

Conclusions

SEIDO 5-10 and SEIDO 10-20 for different azimuths from -90

to 90

and different collector tilts from 0

to 90

are much higher than the boiling temperature of water and glycol/water mixture in normally used of water and glycol/water mixture in normally used pressurized solar collector loops. Therefore, if these three kinds of collectors are used for solar heating systems, stagnation is unavoidable when the y g

circulation pump stops.

10 and SEIDO 10-20 appear with a collector tilt of

10 and SEIDO 10 20 appear with a collector tilt of

36

and with the collectors facing south..

!

Thank You!