A piping system for recovery heat energy from an exhaust gas in a heat recovery furnace, the piping system comprising a piping inlet, where the piping inlet transects a wall of a stack zone of the heat recovery furnace, a piping run, the piping run fluidly connected to the piping inlet, and a piping outlet, the piping outlet fluidly connected to the piping run, where the piping outlet transects the wall of the stack zone of the heat recovery furnace, where the piping system is positioned in a stack zone of the heat recovery furnace between a stack inlet and a stack outlet.

A piping system for recovery heat energy from an exhaust gas in a heat recovery furnace, the piping system comprising a piping inlet, where the piping inlet transects a wall of a stack zone of the heat recovery furnace, a piping run, the piping run fluidly connected to the piping inlet, and a piping outlet, the piping outlet fluidly connected to the piping run, where the piping outlet transects the wall of the stack zone of the heat recovery furnace, where the piping system is positioned in a stack zone of the heat recovery furnace between a stack inlet and a stack outlet.

A system for simultaneous heat recovery and flue gas cleaning, comprising at least one heat pump (300), at least one combined heat recovery and flue gas cleaning unit (1) comprising a heat exchanger (10), said unit having an inlet (20) directing a flow of flue gas into said unit, an outlet (40) for allowing said flow of flue gas to leave said unit, wherein said heat pump is adapted to deliver a flow of cooling media to the heat exchanger at a temperature in the interval of about 4 to about +4 C. This system is compact, efficient and easy to operate. The system can easily be expanded thanks to a modular concept, and it is well suited for mobile applications. A method for heat recovery and flue gas cleaning is also disclosed.

A domestic boiler preheater includes a flue box including a combustion gas inlet to receive hot combustion gas from a boiler, and a combustion air inlet to receive air for combustion in a boiler. The preheater includes a condenser including a mains cold water inlet and a mains water outlet arranged such that mains water flows through the condenser prior to being supplied to a boiler combustion chamber. The condenser includes a central heating water return and a central heating water flow outlet arranged such that central heating water flows through the condenser prior to being supplied to the boiler combustion chamber. The condenser includes connections that enable the condenser to be connected to preheated fluid supply pipework from a source of preheated fluid, the preheated fluid including fluid heated by heat from at least one of the combustion gas and a renewable energy source.

A domestic boiler preheater includes a flue box having a combustion gas inlet to receive hot combustion gas from a boiler, and a combustion air inlet to receive air for combustion in a boiler. The preheater further includes a condenser having a mains cold water inlet and a mains water outlet arranged such that mains water flows through the condenser prior to being supplied to a boiler combustion chamber. The condenser further includes a central heating water return and a central heating water flow outlet arranged such that central heating water flows through the condenser prior to being supplied to the boiler combustion chamber. The condenser further includes connections that enable the condenser to be connected to preheated fluid supply pipework from a source of preheated fluid, the preheated fluid having fluid heated by heat from at least one of the combustion gas and a renewable energy source.

In one aspect, a photovoltaic energy and thermal energy generated water and heat supply integral unit includes a photovoltaic energy accumulator, a photovoltaic hot plates, a thermal energy vacuum-boiler and water-use sites. The photovoltaic energy accumulator is connected with photovoltaic hot plates. A water outlet of the photovoltaic energy accumulator is connected with a water inlet of thermal energy vacuum boiler. The water outlet of thermal energy vacuum boiler is connected with a water inlet of photovoltaic energy accumulator. When in use, the photovoltaic hot plate to absorb surrounding light energy and transform it into electrical energy for heating water, and surplus energy is to be stored in the photovoltaic energy accumulator. Meanwhile, the thermal energy module of the thermal energy vacuum boiler is used to generate thermal energy to effectively use the renewable resources from the surrounding environment.

A combined hot water and air heating and conditioning system including a first heat exchanger, a heat pump, a chilling tower loop, a burner and a second heat exchanger to provide hot water, air heating and air cooling. The system provides hot water, air heating and cooling all in one single unit. The system utilizes a heat pump to remove heat from ambient air and transfer the rejected heat into a hot water system, thereby using waste heat to heat the hot water system. The system utilizes a heat exchanger not only for the purpose of transferring heat from a heating source to a fluid in the heat exchanger but also for the purpose of dissipating heat from the fluid in the heat exchanger to the surroundings of the heat exchanger, thereby allowing a heat pump to act both as an air heating and conditioning device.

A fan heater for heating using exhaust waste heat, including: a natural exhaust tube discharging some exhaust gas from a water heater; a forced exhaust tube connected to the natural exhaust tube in a parallel structure, the remaining exhaust gas, excluding naturally discharged exhaust gas, flowing into the forced exhaust tube; a heat exchange device on the upper portion of the forced exhaust tube and supplied with high-temperature exhaust gas; a forced exhaust blower installed on the heat exchange device to draw exhaust gas from the forced exhaust tube and discharge it; a main unit having the heat exchange device embedded therein and having a circulation unit such that low-temperature indoor air circulates into the heat exchange device; a warm-air circulation blower supplying the indoor air towards the outer air circulation unit and circulating the low-temperature indoor air so the exhaust gas exchanges heat; and a control unit.

Heat from a rotating prime mover(s) driving a fluid shear pump, heat from the prime mover and any exhaust heat generated by the prime mover is collected. The heat energy collected from all of these sources is transmitted through heat exchangers to a fluid where heat energy is desired. This fluid heating process is performed in the absence of an open flame.

Heat from a rotating prime mover(s) driving a fluid shear pump, heat from the prime mover and any exhaust heat generated by the prime mover is collected. The heat energy collected from all of these sources is transmitted through heat exchangers to a fluid where heat energy is desired. This fluid heating process is performed in the absence of an open flame.