Providence, RI, United States
Providence, RI, United States

Nortek is a subsidiary of Nortek Group Limited that produces peripheral devices for personal computers, such as speakers, mice, keyboards and webcams as well as mp3 players, DVD players and televisions. The company operates under the tagline of "Italian Design", based on their usage of shaping and colouring. Wikipedia.


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Patent
Nortek | Date: 2015-01-27

A security system control panel or home automation control panel including an end-user replaceable cellular telephony module that is removable from the control panel without disassembling the control panel. The cellular module includes a body, a cellular telephony circuit coupled to the body, a cellular telephony antenna coupled to the body and the cellular telephony circuit, and a first connector coupled to the cellular telephony circuit and the body, wherein the first connector is sized and shaped or otherwise configured to be removably engaged by the end-user with a second connector in the control panel.


A heat pump system (10) comprises a compressor (16), at least one expansion valve (22; 36), an accumulator (18) for storing a volume of liquid refrigerant therein, a liquid refrigerant indicator connected to the accumulator (18) to indicate an appropriate refrigerant charge in cooling and heating modes, and a controller (28). The controller (28) is configured to determine a target compressor discharge pressure based on measured outdoor air temperature and control the compressor discharge pressure by modulating the position of the at least one expansion valve (22; 36), wherein the higher the target discharge pressure target, the less liquid refrigerant is left in the accumulator (18). The accumulator (18) can be sized to always have capacity to hold excess refrigerant during heating operations, and can include a charge level indicator so as to allow proper charge of the system (10) in the field without additional tools.


Heat pumps for climates where demand for cooling and heating are unequal and methods of adapting and distributing heat pumps for such climates. Heat pumps include a compressor, compressor motor, variable-speed drive, and controller. In a number of embodiments, non-volatile memory stores sets of constant speeds for cooling and heating, and a person can select, via an input device, different sets of speeds for cooling and heating to provide the different cooling and heating capacities. The controller then operates the unit at the selected speeds, selecting from within the set based on demand for cooling or heating. In some embodiments, different sets of speeds may have the same minimum speed but different maximum speeds. Identical heat pumps can be configured to have different capacity ratings and different advertized efficiencies for different climates.


Heat pumps that heat or cool a space and that also heat water, refrigerant management systems for such heat pumps, and methods of managing refrigerant charge. Various embodiments remove idle refrigerant from a heat exchanger that is not needed for transferring heat by opening a refrigerant recovery valve and delivering the idle refrigerant from the heat exchanger to an inlet port on the compressor. The heat exchanger can be isolated by closing an electronic expansion valve, actuating a refrigerant management valve, or both. Refrigerant charge can be controlled by controlling how much refrigerant is drawn from the heat exchanger, by letting some refrigerant back into the heat exchanger, or both. Heat pumps can be operated in different modes of operation, and various components can be interconnected with refrigerant conduit. Some embodiments deliver refrigerant gas to the heat exchanger and drive liquid refrigerant out prior to isolating the heat exchanger.


Embodiments of the present disclosure provide a system and method for providing conditioned air to at least one enclosed structure. The system may include at least one conditioning module configured to provide conditioned air to the at least one enclosed structure. The conditioning module(s) may include a conditioning energy exchanger. The conditioning module(s) is configured to circulate desiccant through a desiccant circuit to condition air passing through the conditioning energy exchanger. The conditioning module(s) may be configured to receive at least one of concentrated desiccant or diluted desiccant in order to vary temperature or concentration of the desiccant circulating through the desiccant circuit.


Certain embodiments provide an energy exchange system that includes a supply air flow path, an exhaust air flow path, an energy recovery device disposed within the supply and exhaust air flow paths, and a supply conditioning unit disposed within the supply air flow path. The supply conditioning unit may be downstream from the energy recovery device. Certain embodiments provide a method of conditioning air including introducing outside air as supply air into a supply air flow path, pre-conditioning the supply air with an energy recovery device, and fully-conditioning the supply air with a supply conditioning unit that is downstream from the energy recovery device.


A method for controlling an air conditioning system comprises routing refrigerant through an evaporator to cool air in a space, proportioning refrigerant flow from the evaporator between a condenser circuit and a hot gas reheat circuit that heats air leaving the evaporator, routing refrigerant flow from the condenser circuit and the hot gas reheat circuit through an expansion device and back to the evaporator, monitoring a first temperature at the evaporator, stabilizing proportioning of refrigerant flow between the condenser circuit and the hot gas reheat circuit based on the monitored first temperature.


A heat pump system comprises a compressor, at least one expansion valve, an accumulator for storing a volume of liquid refrigerant therein, a liquid refrigerant indicator connected to the accumulator to indicate an appropriate refrigerant charge in cooling and heating modes, and a controller. The controller is configured to determine a target compressor discharge pressure based on measured outdoor air temperature and control the compressor discharge pressure by modulating the position of the at least one expansion valve, wherein the higher the target discharge pressure target, the less liquid refrigerant is left in the accumulator. The accumulator can be sized to always have capacity to hold excess refrigerant during heating operations, and can include a charge level indicator so as to allow proper charge of the system in the field without additional tools.


Patent
Nortek | Date: 2015-08-19

A liquid to air membrane energy exchanger (LAMEE) can be used as part of a heating and cooling system to transfer heat and moisture between a liquid desiccant and an air stream to condition the temperature and humidity of the air flowing through the LAMEE. The membrane can be a non-porous film having selective permeability for water, but not for other constituents that form the liquid desiccant. The non-porous membrane can allow for use of liquid desiccants, such as glycols, that had been previously determined to be unacceptable or undesirable in these types of applications. In an example, the membrane can be an ion-exchange membrane or pervaporation membrane.


Patent
Nortek and University of Saskatchewan | Date: 2015-12-03

An energy exchanger is provided. The exchanger includes a housing having a front and a back. A plurality of panels forming desiccant channels extend from the front to the back of the housing. Air channels are formed between adjacent panels. The air channels are configured to direct an air stream in a direction from the front of the housing to the back of the housing. A desiccant inlet is provided in flow communication with the desiccant channels. A desiccant outlet is provided in flow communication with the desiccant channels. The desiccant channels are configured to channel desiccant from the desiccant inlet to the desiccant outlet in at least one of a counter-flow or cross-flow direction with respect to the direction of the air stream.

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