pool pump project

Jefftlse

the pump should run depending to the (température / 2) if T°c is up to 26°c

if T =26°c pump run 13hours

if T=27°c pump run 13,5hours

if T=28°c pump run 14hours

.....

If T=40°c pump run 20hours

if T=41°C pump run 20,5hours

if T=42°C pump run 21hours

...

how should the pumps actually behave if the temperature changes during the runtime?

Sorry, I forget this point. it's just, 

for all conditions pump should start at 00h00 each day (midnight)

actually I have to set it manually

thanks a lot, 

i will try to understand the logic

I tried to simulate but I don't have Q at 1...