Procedure of heat calculation method 熱量計算方法

Program plan for Class 4-B

Practice

□ Problem-solving exercise

□ Practice Web-simulator

Required time

1.5 hours

Effect : Understand heat calculation method

Site Training

Practice the Heat Calculation

①　 Scientific electronic calculator / One person

Heat Duty

1) Fluid : Water (Specific Gravity 1000kg/m3, Specific heat 4.186kJ/KgoC)

Flow rate : 20 m3/h

Temperature condition : Inlet 80 oC → Outlet 60 oC

2) Fluid : Oil (Specific Gravity 839kg/m3, Specific heat 2.005kJ/KgoC)

Flow rate : 50 m3/h

Temperature condition : Inlet 65 oC → Outlet 45 oC

Heat Duty

3) Fluid : Water (Specific Gravity 1000kg/m3, Specific heat 4.186kJ/KgoC)

Flow rate : 20000 kg/h

Temperature condition : Inlet 80 oC → Outlet 60 oC

4) Fluid : 0.2 MPaG Steam (Latent heat 2170kJ/kg )

Flow rate : 200 kg /h

Calculate back the blank figure

1) Unknown value can you estimated from below condition ?

Water 30 m3/h 80 oC → 50oC

Water ?? m3/h 77 oC ← 　 32 oC

Yes or No ?

If Yes, please answer the value. If No., please write the reason.

Calculate back the blank figure

2) Unknown value can you estimated from below condition ?

Water 50 m3/h ?? oC → 50oC Heat Duty 500kW

Water ?? m3/h 41 oC ← 　 32 oC

Yes or No ?

If Yes, please answer the value. If No., please write the reason.

Calculate back the blank figure

3) Unknown value can you estimated from below condition ?

?? 50 m3/h 60 oC → 50oC

Water 50 m3/h ?? oC ← 　 32 oC

Yes or No ?

If Yes, please answer the value. If No., please write the reason.

Calculate back the blank figure

1) Water 18 m3/h 65 oC → 33 oC

Water ?? m3/h 40 oC ← 　 15 oC

Heat Duty ??

Logarithmic temperature difference ?? oC

Overall Heat transfer co-efficient, when the heat transfer area is 10m2

Heat calculation method for plate heat exchanger

高温入口 50℃ 流量 100m3/h 流体名 :

水低温出口 ？

高温出口 40℃

低温入口 10℃

流量 100m3/h 流体名 : 水

Q1 : Calculate Heat duty

Q2 : Calculate out let temperature of cold side

Heat calculation method for plate heat exchanger

Q3 : Calculate LMTD

Q4 : Calculate NTU and select model

Q5 : Calculate total heat transfer area (Ud = 3955 W/m20C)

How to use Web simulator

https://www.hisaka-ex.com/simulator_english/

Please connect below web site

How to use Web simulator

Key-in the specification

How to use Web simulator

You can get the result!!

You can get assembly drawing

Practice the Web-Simulator

高温入口 80℃ 流量 200m3/h 流体名 :

水低温出口 ？

高温出口 50℃

低温入口 10℃

流量 340m3/h 流体名 : 水

Please select model by Web-Simulator.

Practice the Web-Simulator[Advance question]. If you want to select more competitive model, which part shall you change?

Practice the Web-Simulator

Heat transfer area 44.55m2 → 30.15m2

If by-pass flow is acceptable,

[40oC x 200 m3/h +10oC x (340-200)m3/h ] / 340 m3/h = 27.6 oC