I had never heard of this, the use of already existing heat is amazing! Do they run 24/7? If not, they must use a lot of energy to cold start the process. One

I had never heard of this, the use of already existing heat is amazing! Do they run 24/7? If not, they must use a lot of energy to cold start the process. One classic example I always hear about efficient use of heat exchanger is the building of.swimming pool in the same building as ice rink. The heat produce cooling one is used to warm the other.