Calculation method for selection of dongguan mould temperature machine
1. Special cases need to be calculated:
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 required temperature and the starting temperature.
C=specific heat oil (0.5), steel (0.11), water (1), plastic (0.45~0.55)
T=heating time to required temperature (hours)
B. Find the size of the pump
Need to know the pump flow and pressure (head) required by customers
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 required by media L/min)=Q (heat required by 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 of raw materials brought into the mold Kcal/H)=W (weight of raw materials injected into the mold KG per hour) × C × （T1-T2） × S (safety factor 1.5~2) T1 temperature of raw material in the tube;
T2 Temperature of finished product when taking out the mold; Q2 Heat generated by hot runner Kcal/H
B. Quick calculation method (not applicable with hot runner)
1RT=7~8 OZ 1OZ=28.3g (including safety factor)