A constant temperature air circulation system is provided. Air valves are installed behind two three-way nodes of a main circulation loop and parallel bypasses to adjust a flowing amount of gas of each branch. When a compressor keeps a current state unchanged, a draught fan and air valves do not change. When the compressor needs to be turned on and then to be turned off, an air volume of the draught fan is adjusted, and the flowing amounts of the bypasses and a main circuit are simultaneously adjusted until the air valves that control a flowing amount of an evaporator are all closed and the air valves of the bypasses are all opened. Adjustment of the air valves and state switching of the compressor are made at the same time, so that the flowing amount flowing through a heater to a chamber is ensured to always remain unchanged.

A system, method and apparatus for augmenting a building control system domain. A sensor network platform can be configured to collect data based on measurements from sensors outside of a legacy building control system domain, and to present information based on the collected data to a known interface supported by the legacy building control system. In one embodiment, the collected data can undergo customized processing by an operation center outside of the legacy building control system domain.

A method and apparatus for summarizing and conveying expected thermal responses is described. Expected thermal responses of a room or an entire structure are calculated based on thermostat setpoints. The expected thermal responses are summarized into an expected thermal response visualization and displayed to a user for easy understanding of current, and future, temperature expectations before or as a room or entire structure is heated or cooled.

Systems and methods including a container assembly configured to maintain a controlled environment for storing a product therein are disclosed. Controlled environmental parameters may include at least one of the following: temperature, humidity, payload moisture content, solar radiation, magnetism, microwave, or light illumination. In certain implementations, the system includes a payload chamber and a self-contained lid-integrated environmental control unit (ECU) that may be coupled to the payload chamber using a substantially airtight seal. In certain embodiments, the ECU may include a condenser, a humidity controller, a liquid tank and a power source. Certain embodiments may include a warmer, temperature and/or humidity sensors, and/or a lock. Various combinations of the foregoing components and features may be incorporated, depending on the requirements of each particular implementation.

The attic hot air recirculation system is mechanical system. The attic hot air recirculation system is configured for use with an HVAC system of a building. The attic hot air recirculation system is energy saving technology. The attic hot air recirculation system captures solar energy from the roof of the building. The attic hot air recirculation system monitors the temperature of the captured solar energy and the temperature of a chamber in the building. The attic hot air recirculation system uses the heat generated from the captured solar energy to heat a chamber in the room. When the temperature difference between the temperature of the captured solar energy and the temperature of a chamber in the building makes it thermodynamically favorable to do so, the attic hot air recirculation system transfers heat from the roof into the chamber.

A control method includes acquiring indoor temperatures of a plurality of rooms each having one of a plurality of indoor units of a multi-split air conditioner, identifying a target indoor unit corresponding to a target room in response to the target room satisfying an overheating condition or a supercooling condition, controlling other one or more indoor units of the multi-split air conditioner except for the target indoor unit to be shut down, and switching an operation mode of the target indoor unit.

The present invention relates to a semiconductor refrigeration and heating air conditioner which includes a body with an air outlet and air inlets, and also includes a semiconductor refrigeration assembly mounted in the body and located at the air outlet, metallic conductive sheets connected with the semiconductor refrigeration assembly, a water tank mounted at the lower end inside the body, a cooling water receptacle mounted at the lower end inside the body, a heat dissipation assembly mounted in the cooling water receptacle, and fan blades mounted in the body and close to the air inlets, wherein the semiconductor refrigeration assembly is connected with the heat dissipation assembly through a connection wire, the metallic conductive sheets face the air outlet, and the water tank is connected with the cooling water receptacle through a water pump assembly.

An air conditioner unit includes a refrigeration loop including a condenser and an evaporator, a compressor for circulating refrigerant, and an electronic expansion valve. A controller monitors an operating superheat of the refrigerant across the evaporator, identifies a superheat fault condition based on at least one of the operating superheat, a target valve position of the electronic expansion valve, or a compressor speed, stops the compressor in response to identifying the superheat fault condition, and initiates a calibration process of the electronic expansion valve.

HVAC load can be shifted to change indoor temperature. A time series change in HVAC load data is used as input modified scenario values that represent an HVAC load shape. The HVAC load shape is selected to meet desired energy savings goals, such as reducing or flattening peak energy consumption load to reduce demand charges, moving HVAC consumption to take advantage of lower utility rates, or moving HVAC consumption to match PV production. Time series change in indoor temperature data can be calculated using only inputs of time series change in the time series HVAC load data combined with thermal mass, thermal conductivity, and HVAC efficiency. The approach is applicable for both winter and summer and can be applied when the building has an on-site renewable power system.

An HVAC system includes a single compressor, a pair of condensers, a reheat heat exchanger, an evaporator, and an expansion device. Within the system, the refrigerant exiting the compressor is separated into two portions. In the cooling mode, the first and second portions of the refrigerant are directed from the compressor through the two condensers in parallel. In the reheat mode, the first portion of the refrigerant is directed through the first condenser, while the second portion of the refrigerant is directed through the reheat heat exchanger. The system also may include a head pressure control device that is designed to maintain the compressor discharge pressure within a desired range by adjusting the condenser fan speed.