A recoverable and renewable heat recovery system includes a variable speed inverter compressor in fluid connection with a first heat exchanger and a second heat exchanger via a fluid circuit. The system further includes a solar thermal collection module positioned on top of the compressor and in fluid communication with the compressor, the first heat exchanger and the second heat exchanger via the fluid circuit. A light intensity sensor is configured to determine light intensity on the solar thermal collection module. The solar thermal collection module is configured to retain solar energy thermal energy to increase fluid pressure in the compressor.

Embodiments of the present invention provide a method and system of a portable heat exchanger system. The method includes inserting a heat exchanger in a thermal body such as a campfire or an insulated cooler containing ice. In another embodiments, the heat exchanger system is configured to supply thermally treated to a portable enclosure. In further embodiments, the heat exchanger system is conjoined with a heating element wherein heat is supplied for various tools.

Disclosed is a gas furnace including a mixer configured to mix air and fuel gas introduced from an intake pipe and a manifold respectively so as to produce an air-fuel mixture, a mixing pipe configured to allow the air-fuel mixture having passed through the mixer to flow therein, a burner assembly configured to combust the air-fuel mixture having passed through the mixing pipe so as to generate combustion gas, heat exchangers configured to allow the combustion gas to flow therein, an exhaust pipe configured to discharge exhaust gas, which is the combustion gas having passed through the heat exchangers, to the outside. The gas furnace further includes a recirculator installed around the exhaust pipe and configured to guide a portion of the exhaust gas flowing in the exhaust pipe to the mixer, and may thus greatly reduce or fundamentally block NOx emissions.

Disclosed is a gas furnace including a mixer configured to mix air and fuel gas introduced from an intake pipe and a manifold respectively so as to produce an air-fuel mixture, a mixing pipe configured to allow the air-fuel mixture having passed through the mixer to flow therein, a burner assembly configured to combust the air-fuel mixture having passed through the mixing pipe so as to generate combustion gas, heat exchangers configured to allow the combustion gas to flow therein, an exhaust pipe configured to discharge exhaust gas, which is the combustion gas having passed through the heat exchangers, to the outside. The gas furnace further includes a recirculator installed around the exhaust pipe and configured to guide a portion of the exhaust gas flowing in the exhaust pipe to the mixer, and may thus greatly reduce or fundamentally block NOx emissions.

A modular building with a structure having various constructional elements including columns joists and rafters each including a void to accommodate pipes that carry fluid at a certain temperature, the pipes extending at least below the floor of the building through the joists that are enclosed by a base to define a cavity affecting the temperature of the air in-between the floor and the base. Air vents are provided in the floor to allow for the air flow between the cavity and the inside of the modular building.

A furnace includes a gas burner exposed to a heat-exchange tube. An inducer is fluidly coupled to the heat-exchange tube and configured to induce draft air through the heat-exchange tube. A regulator is fluidly coupled to the gas burner. A rollout shield is disposed adjacent to the gas burner. A rollout switch is disposed in the rollout shield. The rollout switch is electrically coupled to the regulator. At least one vent is formed through the rollout shield adjacent to the rollout switch. The vent provides a path for a rollout flame to the rollout switch. The at least one vent is disposed on at least two sides of the rollout switch.

According to various aspects, exemplary embodiments are disclosed of blow through direct fired heaters including evaporator coils and/or energy recovery ventilation.

According to various aspects, exemplary embodiments are disclosed of blow through direct fired heaters including evaporator coils and/or energy recovery ventilation.

A heating unit for a heating, ventilation and/or air conditioning (HVAC) system may have a first airflow path through the heating unit, a second airflow path through the heating unit, and a heater assembly having a first heating coil positioned within the first airflow path, a second heating coil positioned within the second airflow path, and a coil divider separating the first heating coil and the second heating coil.

Disclosed is a blower including a blower main body configured to move air from a main body suction port formed in a lower end thereof to a main body discharge port formed in an upper end thereof using an air-conditioning module provided therein, and a variable nozzle connected to the upper end of the blower main body so as to suction the air moved from the blower main body through a nozzle suction port thereof and discharge the air through a nozzle discharge port thereof, the variable nozzle including a pair of nozzle guides provided therein to adjust a partial pressure of the air to be discharged through the nozzle discharge port.