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Electricity partner hotly design

● Pipeline and appendix diffusion quantity of heat computation
● Vessel shell of tank diffusion quantity of heat computation
● In peculiar circumstance design
● the table of shell of tank vessel consumes  hotly
● Pipeline radiation meter

The electricity partner heat is the advantage uses electricity the quantity of heat which the partner hot product produces to compensate must accompany the quantity of heat which hot craft installments and so on pipeline, vessel, shell of tank disperse consume, maintains its corresponding medium temperature to satisfy the technological requirement.Therefore correctly calculates craft installment and so on the pipeline, vessel, shell of tank heat dissipation quantities, hot needs the medium temperature to the partner is very important.For this in front of the computation heat dissipation quantity, must first discover the related several important parameters: If TA(Medium maintenance temperatures and so on pipeline, vessel, shell of tank).TB(Locality lowest ambient temperature), d (pipeline outer diameter), do (pipeline inside diameter), S (vessel or shell of tank surface area) delta (heat insulating layer thickness).Moreover also must know the thermal insulation material the name and the placing environment (in room or outdoor, ground or buries).When had known these parameters, draw support again the related computing mode and the table can carry on the concrete computation, thus obtains the heat dissipating capacity which needs.

Pipeline and appendix diffusion quantity of heat computation

Definite pipeline heat dissipation quantity
First should know the pipeline the caliber, the heat insulating layer material and thickness and must maintain difference of the temperature △T, looks up the pipeline radiation meter, (is multiplied by suitable heat preservation coefficient), can obtain the unit long pipeline heat dissipating capacity, if the pipe is multiplied by 0.9 again in the room model of domestic virtue.If the partner hot is the plastic pipeline, because the plastic thermal conductivity is lower than the carbon steel far (0.12:25), therefore the available 0.6-0.7 coefficient revise to the normal heat dissipating capacity.
Example 1: Some factory has a pipeline, the caliber is 1/2 ", the thermal insulation material is the calcium silicate, thickness 10mm, in the pipeline the fluid is the water, the water temperature must maintain 10℃, the winter lowest temperature is - 25℃, environment non-corrosiveness, periphery supplies power condition 380V, 220V has, asks pipeline each meter heat los?
Step one ：△T = T_A - T_B =10℃- (- 25℃) =35℃
Step two ：Looks up the pipeline radiation meter, caliber 1/2 ".10mm heat insulating layer.
When △T =30℃ the heat los is 11.0w/m, when △T =40℃ the heat los is 14.9w/m,△T When =35℃, because each meter loss may use the middle interpolation to obtain (in the table not to have Q_BValue).
Q_B=11.0w/m+ (14.9w/m - 11.0w/m) [(35-30)÷(40-30)] =12.95w/m
Step three ：The heat insulating layer uses the calcium silicate, looks up the thermal insulation material revision mathematical table to be multiplied by heat preservation coefficient f and the correlation coefficient 1.4
Qr=1.4Q_B×f=1.4×12.95w/m×1.50=27.195w
Answer ：Pipeline each meter loss quantity of heat 27.195W

Thermal insulation material revision mathematical table

Definite pipeline valve chest heat dissipating capacity
The gate valve heat dissipating capacity usually is unites caliber pipeline each meter heat los 1.22 times; If is the ball valve, then available 0.7 is multiplied by the gate valve hot consumption quantity, if butterfly valve (throttle valve), then is multiplied by 0.5; If is the floating ball valve, then is multiplied by 0.6.

The determination needs electricity partner tropics length
May know the electricity partner tropics from the product specification the working voltage, the performance number.If figures out the unit length heat los to be bigger than the electricity partner tropics unit length to give off heat the rated value, then the available following method makes up：
    ● Uses two or the more strip equal electricity partner tropics.
    ● Uses the coiling law (if with this law, then must extract the heat los to give off heat first the power ratio to the electricity partner tropics.If on 2 " pipelines the heat los is 24w/m, but electricity partner tropics power 20w/m, then ratio =24/20 is 1.2 times, Zha Dianban the tropics span table may know on 2 " pipelines the spacing is 280mm this kind of winding can satisfy the pipeline the heat dissipation.）
Besides above two methods, but also may adopt the increase heat insulating layer thickness or adopt additional measure atonements and so on thermal conductivity low thermal insulation material.

Electricity partner tropics span table (Unit : mm)

In the electricity partner tropics span table the thermal insulation material is uses the glass fiber for the standard, if may see also the thermal insulation material calibration corrections with its character material the coefficient to carry on the revision, if front example 1 states.
In order to consummate the entire heating system, still needs to consider the flange, the bend and the pipeline metal bracket radiation loss needs the electricity partner tropics length and the reservation electric power supply wiring uses the length, meanwhile needs to consider the reservation supplies the middle connecting box wiring length.The flange adds on 2 time of caliber lengths generally, the bend adds on 1.5 time of caliber lengths; The pipeline metal bracket adds on 3-5 time of caliber length, reserves the power-supply wiring length is generally 1 meter, middle connecting box reservation approximately 0.5 meter.After calculates the related pipeline various appendices the length, then adds the electricity partner tropics length which the partner heat pipe needs, we can obtain the overall system to need the electricity partner tropics the total length.

Vessel shell of tank diffusion quantity of heat computation

First should calculate the vessel shell of tank the surface area, and temperature which must maintain according to the heat insulating layer material thickness and the medium, looks up the shell of tank vessel to consume the table hotly, may know each square meter heat dissipation quantity, again through the computation, the Peking opera has obtains the total heat dissipation which the vessel shell of tank needs to measure Q_T。
Its formula ：Q_T = 1.8Q_BS
In the formula ：1.8 is the safety factor, Q_B： For each square meter heat dissipation quantity (W/m²) - Looks up the shell of tank vessel to consume the table to be possible to know,
S： For vessel shell of tank surface area (m²) - The formula is as follows:

Example 2 ： Some factory has diameter 3 meters, the height 4 meter garden cylindrical craft shell of tank, the locality lowest ambient temperature - 10℃, maximum wind speed 15m/S, presently uses thickness 50mm the glass fiber to make the heat insulating layer, the shell of tank maintenance temperature 80℃, asks this shell of tank heat dissipation quantity.
Step one ：Looks up the shell of tank vessel to consume the table to be possible hotly to know in wind speed 15mm/S, the environment - 10℃, when maintenance temperature 80℃, Q_B=77.39W/m²
Step two ：Q_T=1.8Q_BS=1.8Q_BπD (R+h)=1.8×77.39W/m²×3.14 3m×(1.5m+4m)=7217.235(W)
Answer ： We may know this shell of tank heat dissipation quantity are 7217.235W.
If uses other thermal insulation material, then should see also the thermal insulation material calibration corrections to carry on the heat dissipation quantity revision.

In peculiar circumstance design

As mentioned above, we ascertain the pipeline, the vessel shell of tank heat dissipation quantity, is according to scene actual situation synthesis computation knowing, if in the data sheet you have not needed heat dissipation quantity, then may seek knowledge the data through the computation related heat los formula which needs. May carry on the computation according to the following empirical formula.

Shaping method
hen choice electricity partner hot product model, has from the serviceability, the efficiency, the power supply condition, the highest maintenance temperature, whether there is periphery factors and so on corrosive environment to give the consideration, the concrete method is as follows：
● According to the pipeline highest maintenance temperature and the fortuitous highest operating temperature designated electricity partner hot product the heat-resisting rank, the heat-resisting rank may see also the forecited product model specification and the performance introduction specifically;
● Basis power supply condition, electrical network load situation and electricity partner tropics use length, designation voltage rank (220V, 380V, 660V or 1140V);
● According to the different caliber unit length diffusion quantity of heat either in the different vessel unit area the diffusion quantity of heat determined needs the electricity partner hot product in the length or the unit area power, namely W/m or W/m2；
● Basis different chemical environment (for example whether buries or has caustic gas and so on) to determine needs the electricity partner hot product the structure.
Example 3 ： “1 states according to forecited the example”, and finally knew needs the diffusion the hot power loss is 27.195W/m, carries on the shaping.
According to the shaping method we may primary election RDP2-30 electricity partner tropics are the electricity partner hot product.Because if the example (1) the caliber increases, other conditions are invariable, when must disperse the quantity of heat which consumes is 40W/m, then may act according to the shaping method, chooses RDP initially3-40 or RDP2-40 electricity partner tropics take the partner hot product, if for strong corrosive environment, then may choose enhancement RDP2(Q)-40 sumRDP3The (Q)-40 electricity partner tropics take the partner hot product.
Aluminum adhesive tape：The aluminum adhesive tape amount used is electricity partner tropics 1.3 times.
Presses the sensitive adhesive tape：Presses the sensitive adhesive tape the amount used is 8dL is the pipeline perimeter× pipeline length again ×8 (correlation coefficient)
Can go up or down the choice is not the only method, when choice electricity partner hot product should take “the best distribution, the low power loss” as the principle, nimble application.

The table of shell of tank vessel consumes hotly

Pipeline radiation meter