A cooling system for a photovoltaic panel including micro flat heat pipes (HP) integrated with thermoelectric generators (TEG) and a cooled water reservoir for cooling the working fluid in heat pipes. The cooled water in the reservoir is pumped from the condensate pan of an air conditioner. Experimental results show that cooling system reduced the average temperature of the panel by as much as 19° C. or 25%. Further, the output power of the photovoltaic panel increased by 44% when the photovoltaic panel was used in a very hot climate (30-40° C.). An additional two watts of power was generated by the TEGs.

A single-stage carbon dioxide multi-split cooling and heating multifunctional central air conditioner, comprising a single-stage carbon dioxide circulation system using carbon dioxide as a circulation working medium; the single-stage carbon dioxide circulation system comprises an outdoor unit and a plurality of end heat exchangers provided in parallel; and the carbon dioxide medium performs cooling and/or heating in a circulating manner in a carbon dioxide compressor, an outdoor heat exchanger, a liquid storage tank and the end heat exchangers which are in communication with one another.

A radiant ceiling panel for air conditioning of a room, including a radiating surface on which a tube system for conducting a fluid, in particular water, along the radiating surface is fixed, preferably directly. The length of the radiating surface exceeds its width by a multiple. The tube system includes at least two portions fluidically connected in parallel, in particular arranged in parallel. The radiant ceiling panel has a fastening system, in particular a rope-like fastening system, for freely suspended fastening to a ceiling, or at least elements for interacting with said fastening system. The at least two portions are guided together and back apart again in an assembly region of the radiating surface.

A heating, ventilation, and air conditioning (HVAC) system includes multiple circuit components that enable determining that a refrigerant leak is present in the HVAC system based on a signal. The circuit components then send a first set of instructions to a first set of control systems associated with one or more fans in response to the refrigerant leak being present. The first set of instructions causes the one or more fans to activate. The system then determines that the refrigerant leak signal is no longer present, and initiates a counter to detect when a period of time has passed in response to determining that the refrigerant leak signal is no longer present. The system then sends a second set of instructions to the first control system to cause the fans to return to base operating conditions in response to the counter indicating the period of time has passed.

A heat exchanger element has a heat-conducting body and a heat-transfer fluid pipe embedded in ducts having a channel-shaped locating section and two tabs connected flat to the heat-conducting body. To produce the heat exchanger element, foil strips are pressed into grooves so that they each form a section pressed into the grooves in a channel-like manner and laterally projecting tabs. A building panel has a heat exchanger element with a heat exchange surface, a cooling device and a collecting device, the cooling device being designed to cool the heat exchange surface in contact with the ambient air to a temperature below the dew point of the water vapour in the ambient air.

An air cleaner including a thermoelectric module includes a blowing fan, a filter, and a thermoelectric module, so it is possible to generate cold air or hot air and perform air purification.

A cooling system includes a cooling device having a first cooling coil and a second cooling coil, a first heat transfer fluid in fluid communication with the first cooling coil, a second heat transfer fluid in fluid communication with the second cooling coil, a first heat exchanger in fluid communication with the first heat transfer fluid and the second heat transfer fluid, a second heat exchanger in fluid communication with the second heat transfer fluid and a source of external air, a system of fluid control devices in fluid communication with the second heat transfer fluid and configured to minimize a change in a total pressure drop of the second heat transfer fluid when the cooling system switches between operating modes, and a controller configured to selectively control the cooling device and the system of fluid control devices to operate the cooling system in each of the operating modes.

A cooling system includes an ingress port to receive refrigerant in a vapor form from an evaporator, an egress port to return refrigerant in a liquid form back to the evaporator, a condenser coupled to the ingress port and the egress port, and a compressor coupled to the ingress port and the condenser. When the cooling system operates in a first mode, the condenser is configured to receive and condense the refrigerant from the vapor form into the liquid form and to return the refrigerant in the liquid form to the regress port. When the cooling system operates in a second mode, the compressor is configured to compress the refrigerant in the vapor form and to supply the compressed refrigerant to the condenser to be condensed therein.

The disclosure is directed to techniques for a thermostat to determine the air temperature of a room based on measurements of temperatures sensors located inside a housing of the thermostat. Because the thermostat for an evaporative cooler operates at line voltage and controls current flowing to the evaporative cooler, the magnitude of current flowing through the thermostat may vary from nearly zero, when the thermostat is in the powered-off state, to a current on the order of several amps. The variation in current causes a variation in temperature inside the housing of the thermostat. The techniques of this disclosure compensate for changes the internal housing temperature caused by changes in operating mode. The compensation allows the temperature sensors inside the thermostat housing to determine the air temperature of the room in which the thermostat is located, without regard for the operating mode of the evaporative cooler system.

An air movement system for plant cultivation. An air conditioner receives a gas mixture of air and carbon dioxide, regulates a temperature of the gas mixture, and outputs the gas mixture at the regulated temperature. A first bladeless fan receives the gas mixture output by the air conditioner and supplies the gas mixture as an air flow to a first crop area at a velocity towards an air intake. At least one second bladeless fan assists the air flow from the first crop area to a second crop area so as to maintain the velocity towards the air intake.