Calculation method for selecting type of mold temperature machine
1. Special cases require calculation:
A. Calculate 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 heat oil (0.5), steel (0.11), water (1), plastic (0.45-0.55)
B. Finding the size of the pump
Need to understand the pump flow and pressure (head) required by the customer
P (pressure Kg/cm2)=0.1 × H (lift M) ×α (Specific gravity of heat transfer medium, water=1, oil=0.7-0.9)
L (flow rate required for media L/min)=Q (heat required for mold Kcal/H)/C (media ratio hot water=1 oil=0.45) × T (temperature difference between circulating media and mold) ×α× sixty
2. Refrigerator capacity selection
A, Q (freezing capacity Kcal/H)=Q1+Q2
Q1 (heat brought into the mold by raw materials Kcal/H)=W (weight of raw materials injected into the mold per hour KG) × C × （T1-T2） × S (safety factor 1.5~2)
T1 The temperature of the raw material in the tube; T2 Temperature of finished product when taking out the mold
Heat generated by Q2 hot runner Kcal/H
B. Quick calculation method (not applicable with hot runner)
1RT=7~8 OZ1OZ=28.3g (including safety factor)
1RT=3024Kcal/H=12000BTU/H=3.751KW
1KW=860 Kcal/H1 Kcal=3.97BTU
3. Cooling water tower selection=A+B
For injection molding machine
Cooling Water Tower RT=Ejector Horsepower (HP) × 0.75KW × 860Kcal × 0.4÷3024
B. For refrigerator
Cooling water tower RT=chiller cold ton (HP) × one point two five