Abstract: An air conditioning system is provided and includes a unit receptive of refrigerant having a moderate-to-low global warming potential (GWP) value for thermal interaction with a fluid, an enclosure, a fan disposed and configured for urging a flow of the fluid through the unit, a refrigerant detection sensor and a controller. The refrigerant detection sensor is disposed in the enclosure to be operable in a first mode in which a baseline response is established and a second mode in which refrigerant leak detection is executed based on the baseline response. The refrigerant detection sensor is further configured to generate a binary output of leak and non-leak signals in accordance with a result of the refrigerant leak detection. The controller is configured to control operations of the fan and the vent based on the binary output.

Abstract: An HVAC/R system having: an HVAC/R component that has a heat exchanger, the HVAC/R component configured to allow a refrigerant to flow therethrough; a housing with the heat exchanger disposed there therein, and a supply side air conduit connected to the housing, the supply side air conduit being operably coupled to the HVAC/R component; a supply side leak mitigation damper operably coupled to the supply side air conduit; and wherein the supply side leak mitigation conduit is configured to selectively block airflow through the supply side air conduit.

Abstract: An air conditioning system is provided and includes a unit receptive of refrigerant having a moderate-to-low global warming potential (GWP) value for thermal interaction with a fluid, an enclosure, a fan disposed and configured for urging a flow of the fluid through the unit, a refrigerant detection sensor and a controller. The refrigerant detection sensor is disposed in the enclosure to be operable in a first mode in which a baseline response is established and a second mode in which refrigerant leak detection is executed based on the baseline response. The refrigerant detection sensor is further configured to generate a binary output of leak and non-leak signals in accordance with a result of the refrigerant leak detection. The controller is configured to control operations of the fan and the vent based on the binary output.

Abstract: A hydronic economizer module configured for use in a chiller system having a vapor compression cycle including a housing having at least a first air inlet. A heat exchanger assembly located within said housing. The heat exchanger includes at least one heat exchanger coil. A fan assembly includes at least one fan generally aligned with the at least one heat exchanger coil. At least one valve is movable between a plurality of positions to control a flow of fluid into said heat exchanger assembly. When said at least one valve is in a first position the economizer module is arranged in parallel with a component of the vapor compression cycle. When said at least one valve is in a second position the economizer module is arranged in series with said component of the vapor compression cycle.

Abstract: Disclosed is an air conditioning system having: a first HVAC assembly comprising an indoor heat exchanger and a fan; a first sensor, configured to sense a first temperature reading, operably coupled to the indoor heat exchanger; a second sensor, configured to sense a second temperature reading, positioned downstream of the first sensor and detached from the indoor heat exchanger; and a system controller configured to activate the fan to deliver airflow across the indoor heat exchanger when the difference between the first temperature reading and the second temperature reading is greater than or equal to a predetermined threshold, the temperate differing being checked when the first HVAC assembly is in an inactive mode and the fan and a compressor operably connected to the first HVAC assembly are in an inactive mode.

Abstract: A method for diluting a leaked refrigerant in a refrigeration system according to an example of the present disclosure includes operating the refrigeration system in a purge mode based on at least one purge condition prior to initiating a compressor of the refrigeration system. A refrigeration system according to an example of the present disclosure includes a compressor configured to compress refrigerant in a refrigerant line, a heat exchanger configured to exchange heat with the refrigerant line in a heat exchange mode, a fan configured to pass air through the heat exchanger to an indoor space, and a controller configured to operate the refrigeration system in a purge mode based on at least one purge condition prior to initiating the compressor.

Abstract: Disclosed is a heat exchanger assembly including: a coil; one baffle connected to a first end of the coil, the one baffle being configured to capture a liquid refrigerant that has leaked from the coil, the one baffle being configured to direct the liquid refrigerant toward a first end of a drain pan.

Abstract: Disclosed is a HVAC/R system including: an HVAC/R component that has a heat exchanger, the HVAC/R component configured to allow a refrigerant to flow therethrough; a housing with the heat exchanger disposed there therein, and a supply side air conduit connected to the housing, the supply side air conduit being operably coupled to the HVAC/R component; a supply side leak mitigation damper operably coupled to the supply side air conduit; and wherein the supply side leak mitigation conduit is configured to selectively block airflow through the supply side air conduit.

Abstract: A vapor compression cycle is provided including a compressor, condenser, expansion device, and evaporator fluidly connected via one or more fluid conduits, A fluid circulating within the one of more fluid conduits has a high temperature glide. An intermediate heat exchanger has a first part including at least one pass there through and a second part including at least one pass there through. The first part is arranged downstream from the condenser and at least a portion of the fluid output from the condenser is provided to the first part of the intermediate heat exchanger. Within the first part, a temperature of the at least a portion of the fluid output from the condenser is reduced.

Abstract: An air conditioning system includes an indoor unit located in or connected to a conditioned space, and an outdoor unit located outdoors at an exterior of the conditioned space. An input pathway operably connects the outdoor unit to the indoor unit and is configured to deliver a flow of liquid refrigerant from the outdoor unit to the indoor unit during operation of the air conditioning system. A return pathway operably connects the outdoor unit to the indoor unit and configured to deliver a flow of vapor refrigerant from the indoor unit to the outdoor unit. One or more high flow fittings are located along each of the input pathway and the return pathway, and are configured to automatically actuate from an open position to a closed position in response to a flow rate of refrigerant through the high flow fitting exceeding a preselected threshold.

Abstract: A refrigeration system includes a compressor connected to a first heat exchanger and a second heat exchanger. An expansion device is connected between the first heat exchanger and the second heat exchanger. A ratio of a volume of the first heat exchanger to a volume of the second heat exchanger is between 0.6 and 1.8.

Abstract: A hydronic economizer module is configured for use in a chiller system that has a vapor compression cycle. The hydronic economizer module includes a heat exchanger assembly located within a housing having at least one heat exchanger coil, a fan assembly having at least one fan generally aligned with at least one heat exchanger coil, and at least one valve is movable between a plurality of positions to control a flow of fluid into the heat exchanger assembly. When the at least one valve is in a first position, the economizer module is arranged in parallel with a flat plate heat exchanger. When the at least one valve is in a second position, the economizer module is arranged in series with the flat plate heat exchanger. The flat plate heat exchanger includes at least one fluid port for communicating with a component of the vapor compression cycle.

Abstract: A mitigation damper operably coupled to a return conduit. The return conduit includes an opening. The mitigation damper is positioned adjacent to the opening. The mitigation damper is configured to selectively allow airflow through the opening in response to a detected refrigerant leak.

Abstract: A method for a refrigeration system according to an example of the present disclosure includes monitoring a performance characteristic of a refrigeration system, and based on the performance characteristic deviating from a predefined expected value by more than a predefined threshold: determining that the refrigeration system is leaking refrigerant, and operating a fan configured to pass air through a heat exchanger of the refrigeration system to dissipate the leaked refrigerant. A refrigeration system is also disclosed that is operable to detect and mitigate refrigerant leaks.

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 conditioning system is provided and includes a unit receptive of refrigerant having a moderate-to-low global warming potential (GWP) value for thermal interaction with a fluid, an enclosure, a fan disposed and configured for urging a flow of the fluid through the unit, a refrigerant detection sensor and a controller. The refrigerant detection sensor is disposed in the enclosure to be operable in a first mode in which a baseline response is established and a second mode in which refrigerant leak detection is executed based on the baseline response. The refrigerant detection sensor is further configured to generate a binary output of leak and non-leak signals in accordance with a result of the refrigerant leak detection. The controller is configured to control operations of the fan and the vent based on the binary output.

Abstract: A hydronic economizer module configured for use in a chiller system having a vapor compression cycle including a in housing having at least a first air inlet. A heat exchanger assembly located within said housing. The heat exchanger includes at least one heat exchanger coil. A fan assembly includes at least one fan generally aligned with the at least one heat exchanger coil. At least one valve is movable between a plurality of positions to control a flow of fluid into said heat exchanger assembly. When said at least one valve is in a first position the economizer module is arranged in parallel with a component of the vapor compression cycle. When said at least one valve is in a second position the economizer module is arranged in series with said component of the vapor compression cycle.

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: 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: 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.