A dehumidifier apparatus (10) to provide low humidity air to an enclosure. The apparatus (10) includes an outer housing (11) providing six air passages (12 to 17). Also located in the outer housing (11) is a heat exchanger (22) that provides two air paths between which heat is exchanged. The apparatus (10) further includes coils (27, 28 and 29) as well as a motorised damper (18) and fan (19). The apparatus (10) further includes a refrigeration circuit (73) and controller (30), with the controller (30) operating the damper (18), fan (19) and circuit (73) to provide low dew point dehumidified air.

We provided a dehumidifier with a temperature-sensing safety feature. The temperature probe is in direct contact with the discharge tube, as opposed to the industry standard of measuring temperature at the evaporator. In case the discharge tube overheats, it causes the resistance of the temperature probe to increase above a threshold value. The temperature probe then sends a signal to pause operation of the compressor. In a preferred embodiment, the compressor resumes operation when the temperature returns to normal, unless it overheats repeatedly. The temperature probe remains intact and may be used indefinitely. In preferred embodiments, the temperature-sensing safety feature is combined with a timing safety feature and/or a current-sensing safety feature.

An atmospheric water generator includes a refrigeration circuit having an evaporator coil and a condenser coil. The condenser coil is positioned proximate to the evaporator coil, and preheats a flow of atmospheric air as the air is forced through the condenser coil before the air passes through the evaporator coil. Liquid water condensate from the preheated air is generated as the air passes through the evaporator coil and is accumulated in a water collection tank. A second condenser coil cooled by a second flow of atmospheric air supplies refrigerant to the evaporator coil.

A dehumidifying system includes an enclosure having at least one opening disposed at a first end and at least one opening disposed at a second end. A plurality of air paths that extend through the enclosure and are separated from one another by partitions along at least a portion of the enclosure. A dehumidifier evaporator is disposed within the enclosure and configured such that at least one of the air paths is disposed to flow through the dehumidifier evaporator. The dehumidifier evaporator includes a dehumidifying coil and a heat pipe assembly at least partially wrapping around the dehumidification coil.

A dehumidifying apparatus controls the amount of refrigerant flowing into a third heat exchanger serving as a condenser, so as to secure the amount of heat required for defrosting.

A heat exchange device for air cooling for conditioning and climate control systems for server rooms and the like, which comprises: an air/air heat exchanger, designed to be passed through by a primary air stream along a first trajectory from an intake region to an outflow region and by a secondary air stream along a second trajectory from a corresponding intake region to a corresponding outflow region, water dispensing elements adapted to wet the heat exchanger downward from above, elements of collecting the water that descends from the heat exchanger, a recirculation pump for returning the air-cooling water from the collection elements up to the dispensing elements arranged above the heat exchanger; the water dispensing elements comprise a plurality of nozzles arranged side by side, or rows of nozzles, which are adapted to dispense water with a flow-rate that decreases starting from the intake region for the primary air stream toward the outflow region of the heat exchanger.

Systems, apparatus and methods for operating an environmental control system that delivers dehumidified outdoor air into a conditioned space through an air valve. The method includes establishing CO.sub.2 setpoints corresponding to a ventilation outdoor air flow rate and a dehumidification outdoor air flow rate, determining a humidity metric of the conditioned space, and delivering outside air to the conditioned space at the ventilation outdoor air flow rate or dehumidification outdoor air flow rate based upon the humidity metric. The outside air may be tempered with return air from the conditioned space. The dehumidification CO.sub.2 set point is determined by predicting the dehumidification CO.sub.2 set point based on the airflow quantity per occupant and the relationship of the occupant predicted water vapor emission rate and CO.sub.2 emission rate.

An air conditioning system includes a cooling unit having a cooling coil and a fan, the cooling unit for cooling recirculated air from a return duct; a bypass duct providing an air pathway bypassing the cooling unit; a phase change material (PCM) module including a PCM and a PCM fan for drawing makeup air over the PCM; and a supply duct fluidly coupled to the cooling unit and the PCM module, the supply duct for supplying conditioned air to a space to be conditioned.

Provided is a reservoir (120) of a dehumidifier (100) comprising an enclosure (121) defining an interior region and an exterior region; a first guide surface operatively engaged with a first counterpart surface of the dehumidifier (100) to define a guide path (140);and a handle (130) engaged with the reservoir (120). The handle (130) comprises a grasping surface adapted for being grasped by a hand of a user. The handle (130) is rotatably movable relative to the reservoir (120) between a first position and a second position. In the first position the handle is positioned to provide means for a user to ergonomically draw the reservoir along the guide path by hand. In the second position, the handle is positioned to provide means for a user to ergonomically carry the reservoir by hand.

A heating, ventilation, and air conditioning (HVAC) system for regulating humidity of an enclosed space. The HVAC system includes an evaporator coil. A metering device is fluidly coupled to the evaporator coil. A variable-speed compressor is fluidly coupled to the condenser coil and the evaporator coil and a controller is operatively coupled to the variable-speed compressor. A humidity sensor is operatively coupled to the controller and exposed to the enclosed space. Responsive to a determination that the relative humidity of the enclosed space exceeds the maximum humidity threshold, the controller adjusts a speed of the variable-speed compressor to increase latent capacity of the HVAC system. Responsive to a determination that the relative humidity of the enclosed space falls below the minimum humidity threshold, the controller adjusts a speed of the variable-speed compressor to decrease latent capacity of the HVAC system.