A heat exchanger includes a tube having a length and an outside boundary. The tube is configured to convey fluid therethrough to facilitate heat transfer, and the outside boundary of the tube having a bottom wall portion, a top wall portion opposing the bottom wall portion, and two side wall portions between the bottom wall portion and the top wall portion, in which a segment of the length of the tube has a plurality of dimples selectively placed outside of the bottom wall portion.

Methods and apparatus to monitor environmental conditions and reduce condensation are disclosed. An example apparatus includes a first sensor system to measure a first temperature in a first area and a second sensor system to measure a second temperature in a second area adjacent to the first area. The first area being separated from the second area by a door. A controller has at least one memory, instructions, and processor circuitry to execute the instructions to at least: compare the first temperature and the second temperature; determine if a temperature difference between the first temperature and the second temperature exceeds a temperature threshold; and in response to determining that the temperature difference does not exceed the temperature threshold, deactivate a fan located in the first area.

A dehumidifier includes a machine body having a dehumidification function and a water tank including a receiving cavity. The dehumidifier has a working state, in which the machine body is directly above the water tank and the receiving cavity receives water formed by dehumidification by the machine body.

An air-conditioning apparatus includes a drain pan that receives water, and a detector including an ultrasonic sensor that emits and receives ultrasonic waves. The detector analyzes a response signal from the ultrasonic sensor to detect a contaminant generated in the drain pan. A bottom flat surface portion that forms a bottom of the drain pan is located parallel to a flat surface portion that forms a receiving surface of the ultrasonic sensor.

A dehumidifier includes a machine body having a dehumidification function and a water tank including a receiving cavity. The receiving cavity includes a support boss on an inner side wall of the receiving cavity. The dehumidifier has a working state, in which a bottom of the machine body abuts against the support boss.

The air conditioner according to the present disclosure may comprise a heat exchanger exchanging heat between air and refrigerant, a fan discharging air toward the heat exchanger, a first drain pan disposed in a direction crossed to a direction of air flowing from the fan to the heat exchanger, wherein the first drain pan has an inlet opening through which air discharged from the fan flows toward the heat exchanger, a second drain pan disposed in a direction parallel to a direction of air flowing from the fan to the heat exchanger and a water level sensor rotatably disposed with reference to a rotating center spaced apart from the first drain pan and the second drain pan, wherein the water level sensor detects a water level of water gathered in one of the first drain pan and the second drain pan.

The air conditioner according to the present disclosure may comprise a heat exchanger exchanging heat between air and refrigerant, a fan discharging air toward the heat exchanger, a first drain pan disposed in a direction crossed to a direction of air flowing from the fan to the heat exchanger, wherein the first drain pan has an inlet opening through which air discharged from the fan flows toward the heat exchanger, a second drain pan disposed in a direction parallel to a direction of air flowing from the fan to the heat exchanger and a water level sensor rotatably disposed with reference to a rotating center spaced apart from the first drain pan and the second drain pan, wherein the water level sensor detects a water level of water gathered in one of the first drain pan and the second drain pan.

A packaged terminal air conditioner (PTAC) system includes a wall sleeve in which a chassis is mounted. The wall sleeve includes a bottom configured as a drain pan to collect condensate from the chilling components of the chassis. At a side wall of the wall sleeve there is an aperture configured to allow a person to insert a treatment pellet. The treatment pellet is water soluble and contains an antimicrobial component that prevent or inhibits the growth of biological material that could obstruct the drain system of the wall sleeve and PTAC. A rotating cover is positioned at the side wall to normally cover the aperture and prevent foreign objects from entering the PTAC, but the rotating cover can be rotated so that a hole in the rotating cover aligns with the aperture, allowing insertion of the treatment pellet.

A heating, ventilation, and air conditioning (HVAC) system includes a condensate drain pan configured to be positioned beneath a heat exchanger of the HVAC system, relative to gravity, and configured to collect condensate formed via operation of the heat exchanger. The condensate drain pan comprises a drain surface, a plurality of walls extending from the drain surface to form a receptacle configured to collect the condensate, and a drain outlet formed in a wall of the plurality of walls. The condensate drain pan further comprises an air dam comprising a plurality of baffles, wherein a baffle of the plurality of baffles extends from the wall of the plurality of walls. The air dam is configured to re-direct an air flow flowing within the condensate drain pan away from the drain outlet.

A drain pan for a heating, ventilation, and/or air conditioning (HVAC) system includes a trough defining a flow path and configured to direct condensate along the flow path, a shield disposed within the trough and having a body extending across the trough, and a notch formed in the shield and positioned in the flow path to enable flow of the condensate along the flow path and through the notch.