The evaporator is the face of the refrigeration cycle inside the room. As low-pressure refrigerant evaporates inside copper tubes, it takes the heat of the room air passing over the aluminium fins; the fans blow the cooled air into the room. The cold air you feel in the room and the water that collects under the evaporator are the result of this exchange.
Four values decide the selection: capacity (kW, for a given TD), air flow and air throw, fin spacing and defrost type. Capacity is set by the room heat load, TD by the product’s humidity requirement, fin spacing by room temperature (4 mm in rooms above 0 °C, 6–10 mm in frozen and blast rooms) and defrost type by room temperature as well (electric or hot gas below 0 °C).
By body shape there are ceiling-mounted (cubic, the most common), dual-discharge (narrow, long rooms), wall-mounted and industrial (large warehouses, blast freezing) evaporators. Compact models are used in small spaces such as kitchens and delicatessens, large-surface low-TD models in fruit and vegetable stores.
When installing, the evaporator is placed beside the door rather than opposite it, blowing towards the door; the space in front is left clear; the drain pipe is laid with a slope and heated in frozen rooms. Sonkar manufactures its evaporators in its own factory; our catalog gives capacity tables, air flow, air throw and dimensions for every model.