Calculation method for mold temperature control machine (constant temperature machine, mold temperature machine)

1. Special circumstances need to be calculated:

A. Find heater power or refrigeration power KW=W×△t×C×S/860×T

W = mold weight or cooling water KG

t = temperature difference between the desired temperature and the starting temperature.

C = specific hot oil (0.5), steel (0.11), water (1), plastic (0.45~0.55)

B, the size of the pump

Need to know the pump flow and pressure required by the customer (head)

P (pressure Kg/cm2) = 0.1 × H (head M) × α (heat transfer media specific gravity, water = 1, oil = 0.7-0.9)

L (media required flow rate L / min) = Q (heat required for mold Kcal / H) / C (media ratio hot water = oil = 0.45) × t (temperature difference between the circulating medium and the mold) × α × 60

2. Freezer capacity selection

A, Q (freezing amount Kcal / H) = Q1 + Q2

Q1 (heat amount Kcal/H of raw material brought into the mold) = W (weight KG of raw material injected into the mold per hour) × C × (T1-T2) × S (safety factor 1.5 to 2)

T1 temperature of the raw material in the material pipe; T2 temperature of the finished product when the mold is taken out

Q2 Heat generated by hot runner Kcal/H

B, speed algorithm (with hot runner not applicable)

1RT=7~8 OZ 1OZ=28.3g (including safety factor)

1RT=3024Kcal/H=12000BTU/H=3.751KW

1KW=860 Kcal/H 1 Kcal=3.97BTU

3. Cooling tower selection = A+B

A, injection molding machine

Cooling tower RT=injector horsepower (HP)×0.75KW×860Kcal×0.4÷3024

B, for freezer

Cooling tower RT = freezer cold tons (HP) × 1.25