# Coolant Flow Rate

by meLokesh
Tags: coolant, flow, rate
 P: 22 Does anyone have an idea about how to find the coolant flow rate in the car?? Any theoretical method.. And the volume flow rate of air through the radiator???
 P: 22 I read somewhere that..what someone usually does is that he divides the engine power in bhp by 3 & the result is coolant flow rate in L/min. e.g. 300 bhp engine would have 100 L/min of coolant flow rate... but how to calculate the airflow through the radiator core at a given car speed... suggest something plz..i've got just few hours... i mean, i'm not gonna die.. i have to submit my calculations for the car cooling system within a couple of hours..
 P: 30 Attached is a graph that has the coolant heat flow rate divided by brake HP. I took the revs that make the most power (from dyno test) and got a value (0.95). It depends on the engine type as seen on the right corner. Once you have the value place your engines brake Power (in KW) and compute the heat flow needed to remove (Q dot = value X power [KW]). Now lets make a few assumptions: The water temp entering the radiator : 100 degrees C. The water temp exiting the radiator : 80 degrees C. The delta= 20 C. from the famous equation: Qdot=mDot X Cp X delta T You can isolate the mdot and calculate it. The graph is from an auto engineering book.. I don't remember which one.
P: 22

## Coolant Flow Rate

 Quote by berko1 Attached is a graph that has the coolant heat flow rate divided by brake HP. I took the revs that make the most power (from dyno test) and got a value (0.95). It depends on the engine type as seen on the right corner. Once you have the value place your engines brake Power (in KW) and compute the heat flow needed to remove (Q dot = value X power [KW]). Now lets make a few assumptions: The water temp entering the radiator : 100 degrees C. The water temp exiting the radiator : 80 degrees C. The delta= 20 C. from the famous equation: Qdot=mDot X Cp X delta T You can isolate the mdot and calculate it. The graph is from an auto engineering book.. I don't remember which one.
where to get this graph for my engine??