Chillers are energy hogs. Free cooling can give you a break by using colder ambient air during winter to perform cooling in ...

Geothermal heat exchangers almost always use condenser water or glycol as the heat transfer medium — and, sometimes, refrigerant. Wastewater heat recovery systems typically preheat domestic cold water ...

Since the early 20 th century, mechanical engines have been used to drive refrigeration cycles, but it was not until the 1970’s when many modern-day benefits were realized once the push for energy ...