An air conditioner and a control method thereof. The air conditioner includes an indoor unit including an indoor heat exchanger and an indoor fan, an outdoor unit connected to the indoor unit and including an outdoor heat exchanger, an outdoor fan, a compressor, an expansion valve, and a four-way valve, and at least one processor configured to perform a test operation by controlling the indoor unit and the outdoor unit. Based on an outdoor temperature being less than a predetermined reference temperature, the at least one processor is configured to determine whether the indoor unit and the outdoor unit operate normally, by continuously performing a heating operation and a defrosting operation during the test operation.

An air conditioner includes: a blower configured to discharge air, the blower being connected to an outdoor unit, a parameter generator configured to generate at least one parameter during a time period for which the air conditioner is operated with a first cooling capacity based on a set temperature, a learning unit configured to receive the generated at least one parameter as a learning factor and generate operation mode information, an operation mode controller configured to control at least one of the blower or the outdoor unit based on the generated operation mode information, and a central controller configured to control the parameter generator, the learning unit, and the operation mode controller. The air conditioner is operated with a second cooling capacity after the air conditioner is operated with the first cooling capacity for the time period, the second cooling capacity being different from the first cooling capacity.

A plurality of independent air conditioners, a first air conditioner (AC) (9a), a second AC (9b), and a third AC (9c), are disposed in an air conditioning room. Individual target temperatures of each habitable room that are acquired from an input/output terminal (19) and an outdoor temperature that is acquired by an outdoor temperature sensor (7) are input to a mode setter (32). Based on the individual target temperatures and the outdoor temperature, the mode setter (32) sets a cooling mode and a cooling setpoint temperature for operation in the cooling mode, or a heating mode and a heating setpoint temperature for operation in the heating mode, for each of the first AC (9a), the second AC (9b), and the third AC (9c).

A ventilation and air-conditioning system includes a heat-exchange ventilation apparatus that includes a first inlet and a first outlet installed in a space to be ventilated, and discharges air in the space to be ventilated drawn in from the first inlet to the outdoors via a heat-exchange element, and blows air in the outdoors from the first outlet into the space to be ventilated via the heat-exchange element, and an air-conditioning apparatus that includes an indoor unit including a second inlet and a second outlet installed in the space to be ventilated, and draws in air in the space to be ventilated from the second inlet and blows the air from the second outlet into the space to be ventilated. The air-conditioning apparatus performs a blowing temperature assist operation to blow air from the second outlet toward the first inlet, based on a blowing temperature assist request level.

Disclosed are a method for sterilizing an air conditioner, an air conditioner and a storage medium. The method includes receiving a sterilization instruction, and detecting a temperature of an indoor heat exchanger in a heating mode. When it is determined that the detected temperature of the indoor heat exchanger is lower than a preset sterilization temperature, according to the method, an enhanced vapor injection circulation is started to increase the temperature of the indoor heat exchanger to be higher than the preset sterilization temperature.

A ventilator (1) includes: an air supply fan (2) to supply outdoor air to a room; an air exhaust fan (3) to exhaust indoor air, out of the room; and a total heat exchanger (4) which is made with partition boards (41) being moisture-permeable flat parts and with spacer boards (42) being corrugated parts, the partition boards and the spacer boards being alternately stacked, the total heat exchanger exchanging heat between the outdoor air and the indoor air; and thereby suppresses ice formation. The ventilator (1) includes: an indoor temperature sensor (7); an indoor humidity sensor (8); an outdoor temperature sensor (6); and a control unit (5) to control operation of the air supply fan (2) and the air exhaust fan (3) on a basis of at least one state quantity estimated by substituting the indoor air temperature, the indoor air humidity, and the outdoor air temperature in a total heat exchanger model formula (51a) representing characteristics of the total heat exchanger (4).

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.

A building cooling system includes one or more cooling devices operable to affect an indoor air temperature of a building and a system management circuit. The system management circuit is configured to obtain an objective function that includes a power consumption term and a comfort term, perform an optimization of the objective function over a time horizon to determine values of the cooling capacity of the cooling devices where each value of the cooling capacity corresponds to a time step of the time horizon, and control the cooling devices based on the values of the cooling capacity of the cooling devices. The comfort term of the objective function a difference between a prediction of the indoor air temperature of the building and a temperature setpoint for the building, while the power consumption term is a function of the power consumption of the one or more cooling devices.

An estimation device 10 estimates a boundary condition used in a simulation of a temperature inside a target space. A boundary condition setting unit 109 of the estimation device 10 sets the boundary condition based on an actual measured value of observation data related to the target space and a parameter including a weight to the actual measured value of the observation data. Then, a simulation execution unit 110 calculates a predicted value of the observation data by executing a simulation inside the target space based on the boundary condition set. Then, an error calculation unit 112 calculates an error between the predicted value of the observation data calculated through the simulation and the actual measured value of the observation data. Then, a parameter update unit 113 estimates the parameter so as to reduce the error. Then, the parameter update unit 113 estimates the boundary condition based on the parameter estimated.

A ventilation apparatus includes: a housing including a first inlet through which outside air is sucked, a second inlet through which room air is sucked, a first outlet through which air is supplied to an indoor space, and a second outlet through which air is discharged to an outdoor space; an outside temperature sensor configured to measure a first temperature of the outside air; a room temperature sensor configured to measure a second temperature of the room air; a total heat exchanger configured to perform heat exchange between the outside air and the room air; a first blower communicating with the first outlet; a second blower communicating with the second outlet; and a processor to perform a drying operation for the total heat exchanger by operating at least one of the first blower or the second blower, based on a difference value between the first temperature and the second temperature.