Slot Heat Exchanger Regenerator and Heater

M28

Revised: 04/21/2019

When : d=0.03mm

19K,0.1MPa He

Heat transfer coefficient ≈ 100mW /(cm . K)

Substitute ?

Demonstrator - M28A

M28A

Slot Heat Exchanger type Heater

Pressure (Fluid)                              Velocity (Fluid)

Temperature (Fluid)                     Temperature (Solid)

Slot d=0.3mm (Length=9cm, High=8mm, Number of Slots = 25)

Temperature=610K, dTemperature=170K, Pressure=0.17MPa Air

Air(specific heat capacity 610K)  S = 1310 J/Kg.K

Fluid Speed = 130 m/s

PV=M*R*T==>P(Pa)=(M/V)*R*T=Density*R*T

Density=P/RT , Where R=287.05 J/Kg.K

Density(Air)=170000 / (287.05 * 610) = 0.971 Kg/m^3

M(air)=V * Density = (0.09*0.008*0.0003)*0.971 = 0.00000021 Kg

Heat Q = M * S * dT = 0.00000021 * 1310 * 170 = 0.0468 J

Time (Fluid pass Heater) = 0.09 / 130 = 0.000692 sec

Power = dQ/dT = 0.0468 / 0.000692 = 67.6W

P = dQ/dT = K * A * dt / L

Heat transfer coefficient K =  P * L / (A *dt)

  K = 67.6 * 0.0003 / (0.09 * 0.008 * 170) = 0.166 W /(m . K)

Single slot P = dQ/dT = K.A.dt / L= 0.166*(0.09*0.008)*170/0.0003 ≈ 67W

Total Heat transfer = 67 * 25 = 1675W (Ideal case)

Slot Heat Exchanger Regenerator

Piston

Cylinder

Connecting Rod and Crankshaft

Alpha Double Action Type - M28

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