An air purifier includes a main body having an inlet and a discharge device mounted on the main body and configured to receive air introduced into the main body through the inlet and discharge the air from the air purifier, wherein the discharge device includes a discharge opening, an opening and closing member including a portion having a size and shape corresponding to the discharge opening, and configured to move out of the discharge opening and into the discharge opening to open and close the discharge opening, and a discharge portion including a plurality of discharge holes, wherein each discharge hole of the plurality of discharge holes has a size smaller than a size of the discharge opening, and wherein the discharge portion has an air discharging area that is variable.

An air purifier includes a main body having an inlet and a discharge device mounted on the main body and configured to receive air introduced into the main body through the inlet and discharge the air from the air purifier, wherein the discharge device includes a discharge opening, an opening and closing member including a portion having a size and shape corresponding to the discharge opening, and configured to move out of the discharge opening and into the discharge opening to open and close the discharge opening, and a discharge portion including a plurality of discharge holes, wherein each discharge hole of the plurality of discharge holes has a size smaller than a size of the discharge opening, and wherein the discharge portion has an air discharging area that is variable.

The present invention provides methods and systems for an apparatus for the detection of ions that include a housing containing a top portion and a bottom portion, wherein the bottom portion contains a base that extends to an outer edge from which first and second pairs of spaced-apart, opposed sidewalls project upwards from the outer edge to collectively form an interior storage compartment therein. The sidewalls each have an inner and outer sidewall surfaces and each of the second pair of sidewalls interconnect the first pair of sidewalls to define corners and an interior storage compartment and an upper rim is contained on each sidewall for engaging and supporting the top portion. A circuit board is contained within the interior storage compartment, and an antenna for detecting the ions extends from the top portion.

A questionnaire sending unit (22) sends a questionnaire on an allowable temperature range to each of a plurality of users who use an object space. A range information collection unit (23) collects range information indicating the allowable temperature range by collecting a response to the questionnaire from each of the plurality of users who use the object space. A temperature determination unit (24) determines a set temperature of the object space on a basis of the range information concerning the plurality of users which is collected by the range information collection unit (23).

A replacement air-conditioning system is configured to be able to form stratification of a temperature or an air component in a room by supplying conditioned air to a lower side of the room and discharging indoor air from an upper side of the room. The replacement air-conditioning system includes a detection unit including at least one sensor. The detection unit is configured to detect temperatures or air components at a first height set above an assumed boundary height of the stratification in the room and a second height set below the assumed boundary height.

This application discloses a comfort adjustment method and a related apparatus. The method includes: obtaining environment information and user information that correspond to a first space, where the first space is a non-open space; determining, based on the environment information, the user information, and a thermal comfort representation indicator, a control indicator of at least one device corresponding to the first space; and controlling the at least one device based on the control indicator of the at least one device.