A heat exchanger comprising a shell having a first end and a second end, a first end plate and a second end plate defining a first volume with the shell that receives a first fluid therein, and at least one heat exchanger tube having a first end affixed to the first end plate and a second end affixed to the second end plate. The at least one heat exchanger tube extends through the second volume and including a cross-section defined by a plurality of lobes extending radially outwardly from the longitudinal center axis thereof. A first fluid passes through the first volume of the shell and a second fluid comprising a hot combustion gas passes through the at least one heat exchanger tube. The cross-section is constant along an entire length of the at least one heat exchanger tube.

The present invention relates to a pin-tube type heat exchanger, comprising: tubes through the inside of which a heat medium flows and which are arranged in parallel with a uniform distance therebetween, so that a combustion product can pass through space between the tubes; and heat transfer fins which are separately coupled to the outer surface of the tubes along the longitudinal direction thereof, so as to be parallel to the direction of flow of the combustion product, wherein inside the tubes a first turbulent flow-generating member is installed for creating turbulence in the flow of the heat medium, wherein the first turbulent flow-generating member comprises a flat plate part, arranged in the longitudinal direction of the tubes, for dividing the inner space of the tubes into two sides, and first guide pieces and second guide pieces which are protrudingly provided at a tilted angle and are separately and alternately provided along the longitudinal direction of both sides of the flat plate part.

An exhaust gas latent-heat recovery device includes: a heat transfer tube disposed inside a duct through which exhaust gas flows, the heat transfer tube having a water supply inlet into which water to be heated for recovering latent heat of the exhaust gas is supplied and a water supply outlet through which the water to be heated is discharged; and a water supply control part configured to control supply of the water to be heated to the water supply inlet. The water supply control part is configured to control supply of the water to be heated from the water supply inlet so that an outlet temperature being a temperature of the water to be heated at the water supply outlet is at a set temperature.

It is common in heating systems, such as in a hot water heater for there to be a combustor with the exhaust gases from the combustor provided to a heat exchanger to heat up the water. Disclosed herein is an integrated heat exchanger and burner assembly in which the combustion occurs proximate the surface of the heat exchanger. Such a system may include at least one tube that is coiled into a number of turns, that is a tube coil with the at least one tube having an inlet and an outlet and the distance between adjacent turns is less than a predetermined distance, i.e. a the quench distance.

A fluid heating system including: a pressure vessel shell com including prising a first inlet; a heat exchanger disposed in the pressure vessel shell, the heat exchanger including a second inlet and a second outlet, wherein the second inlet of the heat exchanger is connected to the first inlet of the pressure vessel shell; and an exhaust manifold disposed in the pressure vessel shell, the exhaust manifold including a third inlet and a third outlet, wherein the third inlet of the exhaust manifold is connected to the second outlet of the heat exchanger, wherein the third outlet of the exhaust manifold is outside of the pressure vessel shell, and wherein the exhaust manifold penetrates the pressure vessel shell.

A hot water apparatus includes a burner, a sensible heat recovery heat exchanger, and an ignition plug. The sensible heat recovery heat exchanger includes a case. The ignition plug includes an insulator portion and two electrodes. The insulator portion includes a base end portion and a tip end portion. The tip end portion includes a tip end surface and a groove portion. The tip end surface is arranged opposite to the base end portion. The groove portion is recessed from the tip end surface toward the base end portion. The groove portion is arranged between the two electrodes and provided across top and bottom ends of the tip end portion. The groove portion has a lateral width decreasing from the top end toward the bottom end of the tip end portion.

A heat exchanger including a heat transfer fin (1) having a heat-transfer-tube insertion hole (10) through which a heat transfer tube (40) is inserted, and a brazing material holding portion (100) provided above the heat-transfer-tube insertion hole (10) to hold a brazing material (4), wherein when the heat transfer tube (40) is inserted through the heat-transfer-tube insertion hole (10), left and right non-contact portions (15), (16) where a circumferential edge of the heat-transfer-tube insertion hole (10) and an outer circumferential surface of the heat transfer tube (40) are not in contact with each other are separately formed on an upper circumferential edge of the heat-transfer-tube insertion hole (10), and a brazing material guiding portion (100) extending toward the outer circumferential surface of the heat transfer tube (40) is formed between the left and right non-contact portions (15), (16).

A fluid heating apparatus may comprise a fluid pumping assembly configured to increase a pressure characteristic of the fluid between the fluid inlet and fluid outlet, and a heating assembly configured to heat the fluid between the fluid inlet and the fluid outlet. The heating assembly may define a first portion of a gas path such that exhaust gases from combustion in the heating assembly enter the gas path. The apparatus may also comprise a heat recovery assembly configured to recover heat from the exhaust gases and transfer recovered heat to fluid moving through the fluid path. The heat recovery assembly may define a second portion of the gas path in fluid communication with the first portion of the gas path. An exhaust gas movement device may be configured to pull exhaust gases through the first and second portions of the gas path to the gas movement device.

A heat exchanger for hot water supply (21) is comprised of: a first heat exchanging unit (21) a that heats the water, which is supplied from a second communication section x.sub.1 to the hollow portions of hollow plates P.sub.1 to P.sub.5 and reaches a first communication section y, by a combustion exhaust gas that circulates through the gaps among the hollow plates P.sub.1 to P.sub.5; and a second heat exchanging unit (21b) that heats the water, which is supplied from the first communication section y to the hollow portions of the hollow plates P.sub.6 to P.sub.8 below the hollow plates P.sub.1 to P.sub.5 and reaches a third communication section x.sub.2, by a heat medium that circulates through the gaps among the hollow plates P.sub.6 to P.sub.8.

A hot water apparatus includes a burner, a latent heat recovery heat exchanger, a housing, a fixing member, an attachment member, and a straightening vane. The fixing member is configured to fix the latent heat recovery heat exchanger to the housing. The attachment member is configured to attach the fixing member to a case. The straightening vane is arranged in the case. The attachment member protrudes into the case. The straightening vane includes a top plate portion arranged upstream from the attachment member in a direction of flow of the heating gas in the case.