1. Special conditions of cooling water tower shall 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. Dongguan chiller 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
Heat generated by runner Kcal/H
B. Cooling water tower speed algorithm (not applicable with hot runner)
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 water tower selection=A+B
A. For injection molding machine
Cooling water tower RT=HP × 0.75KW × 860Kcal × 0.4÷3024
B. For Dongguan water chiller
Cooling water tower RT=chiller cooling ton (HP) × one point two five