18051results about "Refrigeration safety arrangement" patented technology

A system PDA-based on line diagnostics for automatically discovering a thermostat configuration, turning off normal controller delays, temporary overriding sensor inputs and set points, and verifying proper output action including the monitoring the discharge air temperature for the resulting temperature behavior based on the equipment stages activated. The diagnosis may include the testing of sensors, set points, the fan, cooling equipment, heating equipment and the wiring connecting the controls with the fan, and the cooling and heating equipment. Problems discovered may be reported, automatically recorded and the original operating parameters may be restored.

A control unit is attached to or embedded within a refrigeration appliance to monitor electric power voltage and / or frequency supplied by the mains. If the unit detects a sag or peak in either the voltage or frequency, the control unit either separates any high demand elements of the appliance from the mains to reduce demand in a sag or energizes the elements in a peak. When the control system separates the refrigeration compressor from the mains, a food spoilage monitoring system monitors the food storage compartments. This system utilizes food industry temperature and time algorithms to ensure the food does not spoil. If food spoilage could occur, the unit re-energizes the compressor to allow it to lower the temperature provided the power is sufficient to operate the compressor unit without damaging it. Once the sensed temperature is restored to a safe level, the unit separates the compressor from the mains.

An interactive system for controlling the operation of an HVAC system is provide that comprises a thermostat for initiating the operation of the HVAC system in either a full capacity mode of operation or at least one reduced capacity mode of operation, and a controller for an outside condenser unit having a condenser fan motor and a compressor motor, the controller being capable of operating the compressor in a full capacity mode and at least one reduced capacity mode. The system also comprises a controller for an indoor blower unit having a blower fan motor, the controller being capable of operating the blower fan motor in a full capacity mode an at least one reduced capacity mode. The system further includes a communication means for transmitting information between the outside condenser unit controller and at least the indoor blower controller, where the information relates to the operation of the indoor blower and the outdoor condenser unit. The indoor blower controller responsively controls the operation of the blower fan motor in a full capacity mode or a reduced capacity mode based on the information received from the outdoor unit controller, and the outdoor unit controller responsively controls the operation of the compressor in a full capacity mode or a reduced capacity mode based on the information received from the indoor blower controller.

Disclosed is a method for detecting a leak in a closed loop heat transfer system comprising monitoring the pressure of the heat transfer composition inside said heat transfer system, wherein a drop in pressure indicates a leak. Also disclosed is a heat transfer system comprising an evaporator, a compressor, a condenser, an expander and a device for measuring internal system pressure. The system pressure measuring device is disposed inside the closed loop heat system. The internal system pressure measuring means may be located either between the evaporator and the condenser, between the expander and the evaporator, between the compressor and the condenser, or between the condenser and the expander.

The graphic user interface of an HVAC thermostat displays the programming and status information for remote devices in communication with the thermostat, such as various home sensors and appliances. In an embodiment, the thermostat includes a touch screen display to present the user with a plurality of user interface screens. The monthly calendar interface screen includes a calendar graphic area comprising a matrix display of dates for a full month. The user selects a programming interval for which to enter the thermostat programming events from the calendar graphic area. The user interface includes a clock face interface screen for entry of thermostat programming events. The clock face screen includes a pair of clock face graphic areas for each daily thermostat programming event. The user interface also includes a screen for displaying the programming and status information for remote devices selected from a list of devices in communication with the thermostat.

A system and method for managing energy consumption of a building system includes a source of actual energy consumption data, a source of actual weather data, and a database correlating discrete weather data values with expected energy consumption values for at least one component of the building system. A computer accesses the actual weather data, actual energy consumption data and database, wherein the computer compares the expected energy consumption values with actual energy consumption data and generates an output based on the comparison. The expected energy consumption values are generated for the discrete weather data values using an energy consumption model that functionally relates discrete weather data values and design information for the building system component.

A home refrigerator system (200) includes an enclosure (202) that defines an interior (203) for storing food (223, 224), a machine (209) for cooling the interior (203), a door (205) usable for accessing the interior (203), and a camera (252) for imaging the interior (203) while the door (205) is shut. The camera generates a signal (284) encoding the image of the interior. The signal (284) can be viewed on a screen (286) outside the interior, to assist in decision-making without opening the door (205).

A thermostat providing modulated or analog control of valves or dampers of an air management system. This permits operating a single cooling or heating stage with partially open valves or dampers as needed, since one full stage that is either fully on or off may not be easy to manage for effective air management of a particular type of building, zone or facility. The thermostat may also provide non-modulated control of multi-stage cooling and heating systems. The thermostat may even be used to control a modulated system having more than one stage of cooling or heating.

A field programmable or configurable thermostat for an HVAC system is provided. The configurable thermostat allows field programmability of service contact information, including name and contact telephone number information for the installer or service person. The system reminders and service intervals may be provided based upon calendar time or run time, and may be adjusted to particular periods by the service person in the field. Soft keys whose function is described on various changing menus allow service person to navigate through the various display and information entry screens. Scrolling or selection keys are used in one embodiment to vary the information on appropriate screens. Alternate embodiments utilize touch screens, alphanumeric keypads, etc., for the entry and editing of such information.

A system and method of control of refrigerant air conditioning including a humidity input sensor, and a coolant velocity sensor, using a control system set with a set point whereby to maintain a maximum evaporator temperature set point varying to suit each heat and moisture load condition over a range of conditions compatible with high engineering standards of performance.

A household energy management system uses measurements of the household electricity supply 4 to identify and to determine the energy consumption of individual household appliances. From these measurements, models can be built of the behaviour of the occupants of the house, the thermal properties of the house and the efficiency of the appliances. Using the models, the household appliances—in particular heating and cooling appliances—can be controlled to optimize energy efficiency; and maintenance programmes for the appliances and for the house itself can be recommended to the householder or arranged with a service company.

In an air conditioning apparatus for a vehicle, a water / refrigerant heat exchanger is disposed at a refrigerant discharge side of a compressor of a refrigerant cycle, and a cooling unit for cooling a heat-generating unit with refrigerant having an intermediate pressure of the refrigerant cycle is disposed at a downstream refrigerant side of the water / refrigerant heat exchanger. The air conditioning apparatus includes an evaporator and a hot-water type heater core disposed in an air conditioning duct. In a cooling water circuit, an engine, a radiator and an electrical pump are disposed in addition to the water / refrigerant heat exchanger and the hot-water type heater core. Thus, refrigerant absorbs heat generated in the heat-generating unit, and is heat-exchanged with cooling water in the water / refrigerant heat exchanger after passing through the compressor. As a result, the heat-generating unit can be cooled sufficiently even when outside air temperature is high in the summer, and heating capacity can be effectively improved using heat generated from the heat-generating unit in the winter.

An equipment interface module that can operate one or more pieces of HVAC equipment in accordance with instructions received from a properly operating thermostat, yet can also operate the HVAC equipment when communications between the thermostat and the HVAC controller are lost due to, for example, low battery power at the thermostat, malfunctioning thermostat sensor(s), malfunctioning communication and / or thermostat circuitry, electrical interference, and the like. In some instances, the equipment interface module may regulate the HVAC equipment in accordance with a signal from a remote sensor when communication with the thermostat is lost.

A method of calculating net sensible cooling capacity of a cooling unit includes measuring a discharge pressure from of fluid from a compressor and a suction pressure from an evaporator, calculating a condensing temperature of fluid flowing from the compressor and an evaporating temperature of fluid flowing from the evaporator, calculating a mass flow rate of fluid flowing from the compressor, calculating enthalpy of fluid flowing from the compressor, of fluid flowing from the thermal expansion valve, and of fluid flowing from the evaporator, calculating a mass flow rate of fluid flowing through the hot gas bypass valve, and calculating net sensible cooling capacity. Embodiments of cooling units and other methods are further disclosed.

A real-time monitoring system that monitors various aspects of the operation of a refrigerant-cycle system is described. In one embodiment, the system includes a processor that measures power provided to the refrigerant-cycle system and that gathers data from one or more sensors and uses the sensor data to calculate a figure of merit related to the efficiency of the system. In one embodiment, the sensors include one or more of the following sensors: a suction line temperature sensor, a suction line pressure sensor, a suction line flow sensor, a hot gas line temperature sensor, a hot gas line pressure sensor, a hot gas line flow sensor, a liquid line temperature sensor, a liquid line pressure sensor, a liquid line flow sensor. In one embodiment, the sensors include one or more of an evaporator air temperature input sensor, an evaporator air temperature output sensor, an evaporator air flow sensor, an evaporator air humidity sensor, and a differential pressure sensor. In one embodiment, the sensors include one or more of a condenser air temperature input sensor, a condenser air temperature output sensor, and a condenser air flow sensor, an evaporator air humidity sensor. In one embodiment, the sensors include one or more of an ambient air sensor and an ambient humidity sensor.

An interactive system for controlling the operation of an HVAC system is provide that comprises a thermostat for initiating the operation of the HVAC system in either a full capacity mode of operation or at least one reduced capacity mode of operation, and a controller for an outside condenser unit having a condenser fan motor and a compressor motor, the controller being capable of operating the compressor in a full capacity mode and at least one reduced capacity mode. The system also comprises a controller for an indoor blower unit having a blower fan motor, the controller being capable of operating the blower fan motor in a full capacity mode an at least one reduced capacity mode. The system further includes a communication means for transmitting information between the outside condenser unit controller and at least the indoor blower controller, where the information relates to the operation of the indoor blower and the outdoor condenser unit. The indoor blower controller responsively controls the operation of the blower fan motor in a full capacity mode or a reduced capacity mode based on the information received from the outdoor unit controller, and the outdoor unit controller responsively controls the operation of the compressor in a full capacity mode or a reduced capacity mode based on the information received from the indoor blower controller.

A building automation system having: a plurality of wireless remote devices, each wireless remote device including a wireless transceiver for transmitting and receiving digital information and an interface for energy management which can read a sensor, such as a temperature sensor, a flow sensor, an electronically readable gas or electric meter, or provide an output, such as a relay driver; and a controller having a wireless transceiver for digital communication with the wireless remote devices and a computer interface. Each wireless remote device includes an identifier to identify the type of interface present in the remote device and a serial number to allow the controller to communicate exclusively with any individual remote device. The controller interface allows the controller to communicate with a computer, and ultimately with a server to allow monitoring and control of the system from virtually anywhere in the world.

A cooling system for providing conditioned air to a facility includes a chiller or other cooling subsystem, a cooling tower subsystem and one or more air handling units or process cooling units. The cooling subsystem may advantageously include one or more chillers (e.g., variable speed chillers, constant speed chillers, absorption chillers, etc.) and chilled fluid pumps. The cooling tower subsystem includes one or more cooling tower units and condenser fluid pumps. In some implementations, the air handling unit has a cooling coil and a variable volume fan. In some implementations, direct expansion (DX) cooling systems comprise compressors, evaporators and air-cooled, water-cooled or evaporatively-cooled condensing systems. Such systems can be controlled to reduce energy waste, improve occupant comfort and / or improve the thermal characteristics of the process cooling unit. The cooling system further comprises a control system which is configured to evaluate a cooling load value at the air handling unit and use the cooling load value to calculate at least one operational setpoint. The operational setpoint may advantageously be selected to improve the energy efficiency of the overall cooling system.

A thermostat remote control system includes a transmitter / receiver unit hard wired to a building climate control thermostat and a remote control unit that communicates with the hard-wired transmitter / receiver unit via wireless signals. The remote control unit includes braille labels associated with the control elements and further includes sound generators that generate audible signals that correspond to the temperature sensed by the thermostat and that also correspond to actions taken using the remote control.

A thermostat temperature programming display system for a digital thermostat that provides a graphical illustration of the relationship between the heating, cooling, and ambient temperatures is provided. This display system illustrates this relationship as digital markers along a linear temperature set point line on the display. As a set point is varied, the digital marker moves along the set point line. The heating and cooling set point markers are bounded by one another in a variable relationship based on a user defined dead band temperature during an automatic change over mode of operation. Only an appropriate marker is illustrated on the set point line based on the operating mode of the thermostat.