Abstract: A heating system includes a refrigerant boiler including a heat source for heating a refrigerant from a liquid state to a vapor state, a boiler outlet and a boiler inlet; a heat exchanger in fluid communication with the refrigerant boiler, the heat exchanger including a upper manifold having a heat exchanger inlet coupled to the boiler outlet, a lower manifold having a heat exchanger outlet coupled to the boiler inlet and a plurality of tubes connecting the upper manifold and the lower manifold, wherein refrigerant passes from the upper manifold to the lower manifold via gravity; and a fan moving air over the heat exchanger to define supply air for a space to be heated.

Abstract: An air supply system and a method for controlling operation of an air supply system for supplying a conditioned air flow at a setpoint air temperature to a climate controlled space.

Abstract: An HVAC/R system configured to receive power from a main power source is provided. The HVAC/R system includes an HVAC/R component configured to contain a refrigerant and allow a refrigerant to flow therethrough, a detecting mechanism configured to detect a concentration of the refrigerant outside of the HVAC/R component, and a blower configured to operate under power from an auxiliary power source upon detection of the refrigerant above a predetermined refrigerant level during a main power source outage.

Abstract: A chiller system is provided including a vapor compression circuit consisting of a fluidly coupled compressor, condenser, expansion valve, and evaporator. A refrigerant circulates through the vapor compression circuit. The evaporator is a direct exchange heat exchanger. Refrigerant provided at an outlet of the evaporator is a two-phase mixture including liquid refrigerant and vapor refrigerant. The vapor refrigerant comprises less than or equal to 85% of the two-phase mixture. A refrigerant to refrigerant heat exchanger is fluidly coupled to the circuit. The refrigerant to refrigerant heat exchanger is configured to convert the vapor refrigerant provided at the outlet of the evaporator into a superheated vapor.

Abstract: In one aspect, an evaporator assembly for a refrigeration system is provided. The evaporator assembly includes a pressure vessel having an inlet and an outlet. The outlet is configured to supply refrigerant to a compressor of the refrigeration system. A liquid suction heat exchanger is disposed within the pressure vessel. The liquid suction heat exchanger is configured to receive a liquid refrigerant for heat exchange with the refrigerant in the pressure vessel.

Abstract: An HVAC&R system including a pumping device configured to circulate a first two-phase medium, a plurality of secondary HVAC&R units, wherein at least one of the plurality of secondary HVAC&R units is operably coupled to the pumping device, and a primary HVAC&R unit operably coupled to at least one of the plurality of secondary HVAC&R units, wherein the pumping device, a portion of the plurality of secondary HVAC&R units, and a portion of the primary HVAC&R unit form a primary loop.

Abstract: A rooftop air conditioning unit to provide conditioned air to a conditioned space within a building is provided and includes a housing, disposed on a roof of the building roof, defining a pathway from an inlet fed by exterior and/or interior air to an outlet leading to the conditioned space and a hydronic heating system disposed within the housing to heat the air traveling along the pathway.

Abstract: A mitigation damper operably coupled to a return conduit including an opening, the mitigation damper positioned adjacent to the opening; wherein the mitigation damper is configured to selectively block airflow in the return conduit and selectively block the opening.

Abstract: A heat pump system includes a refrigerant circuit, at least one variable speed compressor operating with a maximum pressure ratio of at least 5.0 and a variable speed range of at least three times (3×), a heat absorption heat exchanger, a heat rejection heat exchanger, an ejector disposed on the refrigerant circuit upstream of the compressor to extend a pressure ratio range and a volumetric flow range of the compressor in the cold climates, a separator disposed downstream of the ejector and upstream of the heat absorption heat exchanger, and at least one variable speed fan configured to move air through the heat rejection heat exchanger to provide a predefined an air discharge temperature greater than 90° F. A two-phase refrigerant is provided to an inlet of the heat absorption heat exchanger with a quality of less than or equal to 0.05.

Abstract: An HVAC/R system including an HVAC component configured to allow a flammable refrigerant to flow therethrough, at least one supply flame arrestor positioned within the supply air steam, and at least one return flame arrestor positioned within the return air stream, wherein each flame arrestor includes an open area greater than 60%.

Abstract: An air temperature and humidity control device is provided including a first heat pump having a compressor, an expansion valve, a condenser, and an evaporator. The first heat pump has a refrigerant circulating there through. A humidity controller includes a first contactor fluidly coupled to the evaporator and condenser. The first contact includes at least one contact module having a porous sidewall that defines an internal space through which a hygroscopic material flows. A first air flow is in communication with the porous sidewall of the first contactor. The device also has a second heat pump including a first polishing coil. The first polishing coil is substantially aligned with and arranged generally downstream from the first contactor relative to the first air flow.

Abstract: A system has a compressor. A heat rejection heat exchanger is coupled to the compressor to receive refrigerant compressed by the compressor. An ejector has a primary inlet coupled with heat rejection heat exchanger to receive refrigerant, a secondary inlet, and an outlet. The system has a heat absorption heat exchanger. The system includes means for providing at least of a 1-10% quality refrigerant to the heat absorption heat exchanger and an 85-99% quality refrigerant to at least one of the compressor and, if present, a suction line heat exchanger.

Abstract: An air temperature and humidity control device is provided including a first heat pump having a compressor, an expansion valve, a condenser, and an evaporator. The first heat pump has a refrigerant circulating there through. A humidity controller includes a first contactor fluidly coupled to the evaporator and condenser. The first contact includes at least one contact module having a porous sidewall that defines an internal space through which a hygroscopic material flows. A first air flow is in communication with the porous sidewall of the first contactor. The device also has a second heat pump including a first polishing coil. The first polishing coil is substantially aligned with and arranged generally downstream from the first contactor relative to the first air flow.

Abstract: A rooftop air conditioning unit to provide conditioned air to a conditioned space within a building is provided and includes a housing, disposed on a roof of the building roof, defining a pathway from an inlet fed by exterior and/or interior air to an outlet leading to the conditioned space and a hydronic heating system disposed within the housing to heat the air traveling along the pathway.

Abstract: A rooftop air conditioning unit, including an air conditioner to produce conditioned air for a conditioned space within a building, the air conditioner having an evaporator, a compressor operably disposed downstream from the evaporator and a condenser operably interposed between the compressor and the evaporator, the rooftop air conditioning unit including a housing, disposed on a roof of the building to house the evaporator, the compressor and the condenser, the housing being formed to define a pathway from an inlet that is fed by exterior and/or interior air to an outlet leading to the conditioned space and a heat reclaim module disposed within the housing and operably coupled to the air conditioner to be receptive of heat produced in the air conditioner for heat exchange operations.

Abstract: A heating system includes a refrigerant boiler including a heat source for heating a refrigerant from a liquid state to a vapor state, a boiler outlet and a boiler inlet; a heat exchanger in fluid communication with the refrigerant boiler, the heat exchanger including a upper manifold having a heat exchanger inlet coupled to the boiler outlet, a lower manifold having a heat exchanger outlet coupled to the boiler inlet and a plurality of tubes connecting the upper manifold and the lower manifold, wherein refrigerant passes from the upper manifold to the lower manifold via gravity; and a fan moving air over the heat exchanger to define supply air for a space to be heated.

Abstract: A system has a compressor. A heat rejection heat exchanger is coupled to the compressor to receive refrigerant compressed by the compressor. An ejector has a primary inlet coupled with heat rejection heat exchanger to receive refrigerant, a secondary inlet, and an outlet. The system has a heat absorption heat exchanger. The system includes means for providing at least of a 1-10% quality refrigerant to the heat absorption heat exchanger and an 85-99% quality refrigerant to at least one of the compressor and, if present, a suction line heat exchanger.

Abstract: An air supply system and a method for controlling operation of an air supply system for supplying a conditioned air flow at a setpoint air temperature to a climate controlled space are disclosed.

Abstract: A rooftop air conditioner having a variable speed fan and an economizer also includes a control feature for adjusting the minimum damper position in response to the speed of the fan during predetermined conditions in order to maintain a desired volume of fresh air from the economizer.

Abstract: A controlled surface having a direct contact with a flow of cold air circulating within a climate-controlled space is provided. A thermoelectric device is associated with the controlled surface and has a hot junction positioned upstream in the path of the air stream moving over the controlled surface and a cold junction positioned downstream in the path of the air stream. This arrangement provides defogging, defrosting or condensate evaporation for the controlled surface, while the temperature in the climate-controlled space is not appreciably altered, and at least some amount of moisture is removed from the air stream by the thermoelectric device.