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Design
" the equipment and pipeline protect the cold technological general rule " to calculate the adiabatic layer of thickness according to GB11790-89
Nominal diameter less than or equal to pipeline or equipment of 1000mm calculate formulae one:
(D1/D0)LN(D1/D0)=£¨2¦Ë/as¡Ád0£©¡Á[£¨Tf-Ts£©/£¨Ts-Ta£©]
¦Ä=(D1-D0)/2
Nominal diameter greater than pipeline or equipment of 1000mm calculate formulae two (include the rectangle pipeline):
¦Ä=(¦Ë/as)¡Á[£¨Tf-Ts£©/£¨Ts-Ta£©]
¦Ä----Protect cold layer of thickness m
as-----Protect cold layer of appearance in the face of fetching 7Kcal/m.h on 4.2.2 according to general rule for hot coefficient Kcal/m.h. degrees Centigrade of atmosphere. Degrees Centigrade
Tf--- Medium temperature when in charge of
Ta--- The environment temperature fetches the accounting temperature of the outdoor air conditioner in summer
Ts assuares outside cold layer that surface temperature fetches dew point temperature and adds 1 degrees Centigrade on 4.2.4 according to the general rule. Dew point temperature, according to Ta and relative humidity (¦Õ. %) go on
D0--- The pipeline or drum equipment external diameter m D1 ---The pipeline or the drum equipment protect cold layer of external diameters m


£±¡¢ The central air conditioner blows and guarantees the cold thickness form (medium temperature is 14 degrees Centigrade)

Environment temperature
24¡æ
26¡æ
26¡æ
28¡æ
30¡æ
33.5¡æ
Relative humidity
65£¥
70£¥
75£¥
80£¥
83£¥
83£¥
Thickness
3
8
12
18
25
35
£²¡¢Protecting the cold thickness form of frozen water pipe of central air conditioner system (medium temperature is 7 degrees Centigrade)
Environmental state parameter
Temperature
24¡æ
26¡æ
26¡æ
28¡æ
30¡æ
33.5¡æ
Relative humidity
65£¥
70£¥
75£¥
80£¥
83£¥
83£¥
DN10
¦Õ18
10
10
15
20
25
25
DN15
¦Õ22
10
10
15
20
25
25
DN20
¦Õ27
10
15
15
20
25
25
DN25
¦Õ34
10
15
15
25
25
30
DN32
¦Õ42
10
15
15
25
30
30
DN40
¦Õ48
10
15
15
25
30
30
DN50
¦Õ60
10
15
15
25
30
30
DN65
¦Õ76
10
15
20
25
30
35
DN80
¦Õ89
10
15
20
25
30
35
DN100
¦Õ108
10
15
20
25
35
35
DN125
¦Õ133
10
15
20
30
35
40
DN150
¦Õ159
10
15
20
30
35
40
DN200
¦Õ219
15
15
20
30
35
40
DN250
¦Õ273
15
15
20
30
35
45
£³¡¢The water of condensation of the central air conditioner guarantees the cold thickness form (medium temperature is 15 degrees Centigrade)
Environmental state parameter
Temperature
24¡æ
26¡æ
26¡æ
28¡æ
30¡æ
33.5¡æ
Relative humidity
65£¥
70£¥
75£¥
80£¥
83£¥
83£¥
DN300
¦Õ325
15
20
20
30
35
45
DN350
¦Õ377
15
20
20
30
35
45
DN400
¦Õ426
15
20
20
30
40
45
DN450
¦Õ480
15
20
20
30
40
45
£´¡¢In outdoor temperature 33, 83% relative humidity (namely dew point temperature 30.2) different medium temperature keep the thickness form warm under the terms
Environmental state parameter
Temperature
24¡æ
26¡æ
26¡æ
28¡æ
30¡æ
33.5¡æ
Relative humidity
65£¥
70£¥
75£¥
80£¥
83£¥
83£¥
DN10
¦Õ18
5
5
10
10
10
12
DN15
¦Õ22
5
5
10
10
10
15
DN20
¦Õ27
5
5
10
10
15
15
DN25
¦Õ34
5
5
10
15
15
20
DN32
¦Õ42
5
10
10
15
15
20
DN40
¦Õ48
5
10
10
15
20
20
DN50
¦Õ60
5
10
10
15
20
20
DN65
¦Õ76
5
10
15
15
20
20
DN80
¦Õ89
5
10
15
20
20
25
DN100
¦Õ108
5
10
15
20
20
25
DN125
¦Õ133
5
10
15
30
20
30
Construction
¡¡¡¡ Is it must accord with with air conditioner construction of project GB11790-89 " equipment and pipeline protect cold technological general rule " GB11790-89 " is it construct with project of the air conditioner to ventilate to make Request that and it is normal to confirm ".
Construction method of the following pipeline of a nominal diameter 65 (¦Õ 76mm ):
Can adopt the mechanism sleeve pipe of the company to push the law and construct