A heat exchanger for heating a fluid flowing through a pipe using a combustion gas includes: a body including open upper and lower ends and having a space formed therein to allow the combustion gas to pass therethrough; a combustor formed in an upper portion of the space in which combustion of the combustion gas occurs; a heat exchange portion formed below the combustor and provided with a heat exchange pipe configured to heat an internal fluid by using the combustion gas; and a heat return pipe provided outside the space so as to be in contact with an outer surface of the body, wherein the combustor and the heat exchange portion may be unitarily formed, and the body in which the combustor is formed includes a concave portion protruding concavely inward so as to correspond to a shape of an outer circumferential surface of the heat return pipe.

Disclosed is a heat transfer system with a module that includes a peripheral frame (10) and an electrocaloric element (46) disposed in an opening in the peripheral frame. The electrocaloric element includes an electrocaloric film (46), a first electrode (48) on a first side of the electrocaloric film, and a second electrode (50) on a second side of the electrocaloric film. First and second electrically conductive elements (24, 25) are disposed adjacent to first and second surfaces of the peripheral frame, and provide an electrical connection to the first and second electrodes.

The present subject matter relates to a smoke tube boiler including: a mix chamber, a heat exchanger, a firing rod assembly, a sealing means, and an air-cooled cooling means and a water-cooled cooling means.

A radiating panel includes the following succession of layers: at least one supporting layer which is at least thermally insulating and constituted by a material chosen from extruded expanded polystyrene, sintered expanded polystyrene, and polyisocyanurate; at least one heating layer which includes at least one electric heating element and a studded element with interspaces for laying at least one electric heating cable. The studded element has a shaped sheet element with studs extending in the opposite direction to that of the supporting layer.

The panel includes at least one finishing layer which is at least thermally conducting and made of a material chosen at least from ceramic and natural stone.

The panel also includes an adhesive between the heating and finishing layers, and the studded element is coupled to the supporting layer using one element chosen from glue, extruded adhesives, silicone glues, pressure-sensitive adhesive systems, and mechanical fixing elements.

A tankless water heater includes a scale control module (SCM). The SCM is mounted inside or outside of a cabinet which encloses a heat exchanger and source of heat of the water heater. The SCM may include a connector and a cartridge removably attaching to the connector or may only include a cartridge permanently affixed to the tankless water heater. The tankless water heater includes a continuous water pathway inside the cabinet to supply water to all components of the tankless water heater, including the SCM. The tankless water heater receives supply water at its inlet, treats the supply water in the SCM to generate treated water having reduced scale-forming characteristics compared to the supply water, and heats the treated water in the heat exchanger to generate heated treated water.

A heat pump may include a compressor configured to compress a refrigerant, a first temperature sensor configured to detect an outdoor temperature, a second temperature sensor provided in heating pipes connected to a heating device that performs indoor heating and configured to detect a temperature of fluid flowing through the heating pipes, an outdoor heat exchanger configured to perform heat exchange between outdoor air and a refrigerant, a third temperature sensor configured to detect a temperature of the outdoor heat exchanger, and a controller. The controller may be configured to: control power to a boiler and/or to the compressor based on sensing values of the first, second, and third temperature sensors, calculate an expected efficiency of the heat pump based on the sensing value of the first temperature sensor and an initial target temperature, and control power to the boiler based on the expected efficiency.

A heat exchanger includes: a casing into which heating gas is supplied; and a plurality of heat transfer tubes which are arranged in the casing, wherein the plurality of heat transfer tubes are set in a posture in which a plurality of straight tube portions are arranged in a direction intersecting a heating gas flow direction, are stacked a plurality of stages in the heating gas flow direction, and are distinguished into first and second heat transfer tubes respectively located on an upstream side and a downstream side in the heating gas flow direction, and wherein the second heat transfer tube is formed so that an outer diameter of the tube and an arrangement pitch of the plurality of straight tube portions are smaller than those of the first heat transfer tube.

An improved outdoor patio table with centrally secured outdoor patio heater, and methods of using the same are disclosed. The outdoor patio heater may be secured to the within the patio table without increasing the exterior perimeter of the patio table when securing or removing the patio heater. The patio table may be suitable for applications where there are a plurality of tables in a line and when a patio heater is removed frequently.

An electrode is embedded in a piece of ceramic material having a population of conduction band electrons. Applying a voltage bias to the electrode causes electrons to flow towards or away from the electrode to form a positively charged sheath either a distance apart from or adjacent the electrode, depending the polarity of the bias. The electron flow also forms a negatively charged sheath lying opposite the positively charged sheath, and an electrically neutral region lying between the two sheaths. Electromagnetic radiation impinging the ceramic material heats the ceramic where the radiation is absorbed by the electron population. As the incident radiation is absorbed in proportion to the electron density, heating is increased in the negatively charged sheath, relative to the other parts of the ceramic material. The location of heating is controlled by controlling the magnitude and polarity of the voltage bias.

A tube profile (1), in particular for manufacturing a heat exchanger for a condensing boiler, wherein the cross-section (10) of the tube profile (1) comprises: a rectangular portion (20) having two greater sides (21, 22) parallel to each other and two smaller sides (31, 32) parallel to each other and orthogonal to the greater sides (21, 22), and an ogival portion (40) defined by a convex flat figure formed by a base (41) and two curved sides (42, 43) connected to each other in an apical zone (48) opposite to said base, wherein said base (41) coincides with a first side (31) of said two smaller sides (31, 32) of the rectangular portion (20), wherein said two curved sides (42,43) are symmetrical to an axis of symmetry (S-S) parallel to said greater sides (21, 22) and passing through the central points (33, 34) of said smaller sides (31, 32), wherein one end of each of said two curved sides (42, 43) joins to one end of a respective one of said two greater sides (21, 22)) in a first joining point (PH1), said each of said two curved sides (42, 43) being tangent to said respective one of said two greater sides (21, 22) in said first joining point (PH1), and wherein an overall dimension of said ogival portion (HO) measured along said axis of symmetry (S-S) is greater than the length of said base (41); wherein the two greater sides (21, 22), a second side of said two smaller sides (32), and said two curved sides (42, 43), define the outer surfaces (50) of the walls of said tube profile (1).