Systems and methods for providing visualization of health risks within a building. Health risk levels for building spaces are determined using occupancy data and health risk data relating to a risk of contracting or spreading an infectious disease. A visualization of the health risk levels is generated and presented on a user interface.

A device that can accurately detect clogging of a filter and that has a simple structure is provided. A device for measuring clogging of a filter in an air conditioner (2) having a blower (30) that blows gas (40), (42) through a duct (10) and a filter (20) that is provided in the duct (10) and filters dust floating in the gas, comprises a device (26) for measuring a sound pressure that is provided in the duct (10), a data processor (70) that extracts data on the sound pressure at a specific frequency from the data on the sound pressure that have been measured by means of the device (26) for measuring a sound pressure, and an estimating device (70) that estimates clogging of the filter based on the data on the sound pressure at the specific frequency that have been extracted by means of the data processor (70).

An air-conditioning system includes a humidifier, a dehumidifier, transfer fans for transferring air of an air-conditioned room to a room, a damper for independently controlling an air volume transferred to the room, a system controller for controlling the humidifier, the dehumidifier and the damper, a room humidity sensor and an air-conditioned room humidity sensor. The system controller further includes an air-conditioned room humidity controller for maintaining the humidity of the air-conditioned room within a specified humidity range defined by a minimum humidity and a maximum humidity, an air volume determiner for determining an air volume passing through the damper according to the humidity of the room obtained by the room humidity sensor and the humidity of the air-conditioned room obtained by the air-conditioned room humidity sensor and a damper controller for controlling the air volume transferred to the room passing through the damper.

A fresh-air air conditioning system comprises: a first electromagnetic valve connected to a first interior heat exchanger, and the first electromagnetic valve is connected via a first accumulator to a compressor and a third electromagnetic valve; the third electromagnetic valve is connected via a second accumulator to the compressor and a second electromagnetic valve; and the second electromagnetic valve is connected to a second interior heat exchanger. When the first interior heat exchanger or the second interior heat exchanger is closed, the third electromagnetic valve opens so that the first accumulator and the second accumulator simultaneously communicate with the open one of the first interior heat exchanger or the second interior heat exchanger, avoiding poor oil return as a result of prolonged single-cylinder operation of the compressor, and ensuring the reliability of the compressor as well as interior comfort.

A flameless heater system is described. The flameless heater system includes an energy source configured to generate energy and a heating system operatively coupled to the energy source, the heating system being configured to convert the energy to heat. The flameless heater system further includes a humidifying system operatively coupled to the energy source, the humidifying system being configured to convert the energy into moisture and a control system operatively coupled to the energy source, the heating system and the humidifying system, the control system being configured to monitor and control the energy source, the heating system and the humidifying system.

Disclosed is an air conditioning device, including a telescopic main structure, a ventilation air conditioning assembly and a control assembly, the ventilation air conditioning assembly is installed on the main structure, the main structure is configured to form a hermetic space inside it, and is configured to stretch or fold the hermetic space. The ventilation air conditioning assembly is configured to form a differential pressure environment in the hermetic space, the control assembly can be used to control the main structure to stretch or fold, and control the ventilation air conditioning assembly to adjust an air pressure, a temperature and a humidity in the hermetic space.

The invention provides an air-conditioner for maintaining a temperature of a conditioned space at or near a set temperature. The air-conditioner comprises at least one rotating or reciprocating element adapted to rotate or reciprocate at a variable frequency. The variable frequency including one or more nuisance frequencies at which vibration or noise within the air-conditioner or the conditioned space causes a nuisance. A processor programmed to control variation of the variable frequency in response to operational requirement. The processor is configured to operate the at least one rotating or reciprocating element so as to substantially exclude operation at the one or more nuisance frequencies.

A humidifier includes a first housing removably connected to a second housing that includes the majority of the electrical components of the humidifier. The first housing includes a first air inlet for accepting air; a first air outlet; a central chamber for holding water; a piezoelectric transducer installed in the central chamber for atomizing water; and a first electrical connector electrically connected to the piezoelectric transducer. The first housing is configured to discharge humidified air from the first air outlet. The second housing includes a second air outlet removably connectable to the first air inlet; a forced air source for forcing air out of the second air outlet; a second electrical connector configured to removably electrically connect to the first electrical connector; and an electric circuit electrically coupled to the forced air source for electrically powering the forced air source and electrically coupled to the second electrical connector for electrically powering the piezoelectric transducer.

An environment control system utilizes oxygen and humidity control devices that are coupled with an enclosure to independently control the oxygen concentration and the humidity level within the enclosure. An oxygen depletion device may be an oxygen depletion electrolyzer cell that reacts with oxygen within the cell and produces water through electrochemical reactions. A desiccating device may be g, a dehumidification electrolyzer cell, a desiccator, a membrane desiccator or a condenser. A controller may control the amount of voltage and/or current provided to the oxygen depletion electrolyzer cell and therefore the rate of oxygen reduction and may control the amount of voltage and/or current provided to the dehumidification electrolyzer cell and therefore the rate of humidity reduction. The oxygen level may be determined by the measurement of voltage and a limiting current of the oxygen depletion electrolyzer cell. The enclosure may be a food or artifact enclosure.

A damper controller may be configured to send damper control commands to open and close an outdoor air damper to provide free cooling as necessary to satisfy a temperature setpoint inside the building. In some cases, the damper controller may initiate a damper fault test to determine if a damper fault is present. The damper fault test may be based, at least in part, on an outdoor air temperature input, a discharge air temperature input, a commanded damper position, and a damper fault temperature threshold. If a damper fault is determined, the damper controller may send an alert indicative of a detected damper fault. In some cases, the damper fault test results may be weighted to reduce the false positives alerts.