A system and a method for controlling twinned heating appliances are described. The system includes a first heating appliance and a second heating appliance. The first heating appliance includes a first blower and a first wireless communication unit. Further, the second heating appliance is operatively coupled with the first heating appliance as a twinned unit. The second heating appliance includes a second blower and a second wireless communication unit. The system also includes a primary control unit configured to receive speed data indicative of a speed of the first blower and speed data indicative of a speed of the second blower. The primary control unit is further configured to output a blower speed control signal to at least one of the first blower and the second blower to synchronize the first blower and the second blower.

A portable electric heater comprises a heater unit, base assembly, and a shaft extending upwardly from the base assembly. The shaft includes a first end secured to the base assembly and a second end to which the heater unit is secured. The portable electric heater also comprises a renewable energy source and a power assembly including a power management module for controlling power distribution of the renewable energy source to the heater unit.

An electric heater, and an apparatus, a heating and air conditioning system and a vehicle, each comprising the electric heater, are provided. The electric heater comprises an outer frame; a heating core configured to connect to a power source and disposed within the outer frame; and a sealing-waterproof glue member disposed within the outer frame and configured to encase at least one end of the heating core. The heating core further comprises: a plurality of heat dissipating components and heating components arranged alternately, and each of the heat dissipating component is coupled with a heating component via a thermal conductor. Each of the heating components further comprises a core tube and a positive temperature coefficient thermistor disposed in the core tube.

A personal heater device including an ignition device configured to generate a spark to ignite a fuel; a combustion location where ignited fuel burns in response to the spark; a battery receiving port configured to receive a battery; a controller; and a fan assembly including a motor electrically coupled the battery receiving port and controlled by the controller, a fan coupled to an output shaft of the motor, and a passageway configured to route airflow generated by the fan to a location near the combustion location.

This disclosure relates to an improvement over the prior art by providing an improved, indirect heater configuration, which is particularly suitable when the downstream spray drying process requires low to no NOx added to the dried product, which may be the case when using traditional, direct-fired gas burners. Various controls are providing which provide improved performance and efficiency.

Systems, tools, and methods are presented that enable a plurality of turbulators to enhance heat transfer within a heat exchanger of a heating, ventilating, and air conditioning (HVAC) system. The plurality of turbulators each include a ribbon member having a variable pattern formed over a length. In one instance, the variable pattern of the ribbon member includes a plurality of bends defining intervals of alternating pitch. The intervals progressively increase in dimension as the ribbon member is traversed over the length. In another embodiment, the intervals contain apertures whose area increases as the length is traversed. Other systems, tools and methods are presented.

An air conditioning apparatus includes a casing having intake and blow-out ports, a partition member dividing an interior of the casing, a heat exchanger, and a centrifugal fan. The partition member has a fan entrance bored in opposition to the blow-out port. The centrifugal fan includes a bladed wheel mounted in the fan compartment such that a rotary shaft of the bladed wheel is oriented along the fan entrance and the blow-out port. The rotary shaft is disposed adjacent to a bladed wheel nearby lateral part of multiple lateral parts of the casing that are disposed along the opening direction of the fan entrance and the opening direction of the blow-out port. The blow-out port is at least partially disposed in a position adjacent to a blow-out port nearby lateral part of the multiple lateral parts of the casing and being opposed to the bladed wheel nearby lateral part.

An air conditioning apparatus includes a casing having intake and blow-out ports, a partition member dividing an interior of the casing, a heat exchanger, a centrifugal fan, and a heater. The centrifugal fan includes a bladed wheel having a plurality of rearward blades and sucks air existing in the heat exchanger compartment into the fan compartment through the fan entrance. The bladed wheel is mounted in the fan compartment such that a rotary shaft of the bladed wheel is oriented along an opening direction of the fan entrance and an opening direction of the blow-out port. The heater is mounted in a blow-out port opposed space. The blow-out port opposed space is a region opposed to the blow-out port within a fan downwind space. The fan downwind space is a space located on a downwind side of the bladed wheel within the fan compartment.

A rotary apparatus for inputting thermal energy into fluids and for recycling thus heated fluids is provided, comprising: a rotor with at least one row of rotor blades arranged over a circumference of a rotor hub mounted on a rotor shaft and forming at least one rotor blade cascade, respectively, and a plurality of stationary vanes arranged into at least one stationary vane cascade adjacent to said at least one rotor blade cascade, wherein the rotor and the plurality of stationary vanes are enclosed in a duct formed in a casing between at least one inlet and at least one outlet. The rotary apparatus is configured to heat fluids flowing in the duct between at least one inlet and at least one outlet by virtue of series of energy transformations occurring when said fluid successively passes through rotating and stationary blades/vanes, whereby a stream of heated fluid is generated, and to recycle at least a part of thus heated fluid by means of a fluid circulation arrangement configured to return a part of heated fluid into a duct region between at least one inlet and at least one rotor blade cascade. Recycling may be internal or external.

Apparatuses for burning a burnable fuel source, and methods of operating the same, are disclosed. The apparatuses may include a housing defining a chamber and a tube extending through the housing and disposed at least partially within the chamber of the housing, the tube accommodating a burnable fuel source. A tray may be disposed within the chamber and accommodating at least a portion of the burnable fuel source when received within the tube. A refractory brick may be disposed on at least a portion of the tray, and a plurality of pipes may be disposed within the housing such that, upon actuation of the apparatuses, heat from the burnable fuel source contacts the plurality of pipes. The apparatuses may also include an air outlet in the first housing configured to allow air from within the chamber to exit the chamber.