Book - School of Science and Technology

562 Refrigeration: water chillers and heat pumpsThe application in retail stores normally takes one of two forms:. An air-to-air unit, often a reverse cycle device, using outside air as the source to heat orcool supply air as required.. A water-to-air (or -water) device, extracting heat from condenser cooling water connectedto freezer cabinets or cold stores.In office systems, where air-conditioning is required, the use of distributed reverse cycleequipment, referred to earlier, is more popular than that of the less adaptable equivalentcentral plant; however, both have been used with satisfactory results. For further reference,the now defunct Electricity Council has published numerous valuable case studieson heat pump applications.