A thermal recovery device for recovering waste heat from a sink having a bottom plate, the bottom plate having a top surface and a bottom surface, wherein the bottom plate being a thermal conductor, the thermal recovery device including: a tube including an inlet and an outlet, the tube thermally connected to the bottom surface, wherein thermal communication exists between the top surface and a fluid in the tube, a demand for the fluid causes the fluid to flow through the tube and heat transfer to the fluid which raises the temperature of the fluid prior to entering a heater and subsequently arriving at the top surface of the bottom plate of the sink from which the heat is transferred, reducing the heating load of the heater due to the demand of the fluid.

A grey water heat recovery apparatus has first and second passes in counter-flow orientation. The hot side is grey water. The cold side is fresh water. It extracts heat from the grey water. The fresh water is carried in tubing bundles in series immersed in grey water sumps in cylindrical plastic, mild steel, or stainless steel pipe. Both ends of the fresh water bundle assembly extend from the same upper end pipe closure, without a pressurized line wall penetration in the walls of the pipe. There is a non-electrically conductive barrier between the fresh water and grey water flow paths. The apparatus has a leak detection circuit and co-operable bypass valves. The tube bundle is wider at the top than at the bottom. The lower manifold has grey water passages between the centering ears. The entire assembly is enclosed in a unitary external housing with easily accessible connection fittings.

A heat exchanger for recovering heat from wastewater leaving a building and transferring the heat to freshwater for use in the building; it has an inner pipe defining an inner space for receiving wastewater that is being evacuated from the building; an outer pipe, wherein the inner pipe is placed in the outer pipe, and the outer surface of the inner pipe and the inner surface of the outer pipe define an interstitial space for receiving freshwater; a turbulator sheet located in the interstitial space that causes or increases turbulence of the freshwater for improving heat transfer between the freshwater and the wastewater; and two couplings, one on either end of the outer pipe and the inner pipe.

A heat exchanger with integrated thermal storage, for example, having a new tertiary side utilising phase change material in between and in thermal contact with the primary and secondary circuits, e.g. of a plate heat exchanger. The tertiary side helps reduce e.g. leak flows in district heating applications, or reduce energy losses in periods of low flow through the heat exchanger. By including thermal energy storage in a heat exchanger or reactor, response times of the systems are reduced as well as internal energy losses, and external energy storage units are reduced in number or are potentially rendered obsolete.

A dish washing machine including a housing having an interior wash space for washing dishes. The housing has a liquid inlet for adding a liquid to the dish washing machine. At least one rotating spray nozzle sprays the liquid onto dishes positioned within the interior wash space. The machine further includes a heating tank for heating the liquid which is supplied to the at least one rotating spray nozzle for spraying onto the dishes in the interior wash space. Two heat exchange systems are within the housing. The two heat exchange systems transfer heat from the liquid heated by the heating tank to the liquid added to the dish washing machine from the liquid inlet. A first one of the two heat exchange systems passes heat from water in the wash tank or the interior wash space to water in the first one of the two heat exchange systems.

The invention relates to a container (1) for recovering the heat energy of wastewater. The container (1) comprises a shell (10) and a continuous spiral pipe (2) for conveying wastewater through the container in a vertical direction. A first heat transfer space for a heat transfer liquid is arranged between an outer shell of the spiral pipe (2) and the shell (10) of the container (1), and a second heat transfer space is arranged inside the spiral pipe (2). The shell (10) is provided with at least one openable inspection hatch (6) having fastened thereto a manifold (7) as well as a shell and tube heat exchanger (3) having its inlet and outlet ends coupled to said manifold (7). The spiral pipe (2) consists of acid-proof or stainless steel and its internal surface is adapted to have a higher chromium content than the other parts of the spiral pipe's wall.

The invention relates to a method for controlling the recovery of heat energy from a wastewater (J) flow present in a spiral pipe (2) into a heat transfer fluid (L) flowing in a first heat transfer space (4) inside a container (1) with a temperature difference between the wastewater (J) and the heat transfer fluid (L). The method comprises the steps of adjusting the ratio (V3N5) of two heat transfer fluid volume flows (V3, V5) by adjusting the heat transfer coefficient through the spiral pipe's (2) walls by means of form factors of the spiral pipe's helices (21-28), by measuring the temperature of the heat transfer fluid (L) and/or the temperature of the wastewater (J), and by controlling the temperature of the wastewater (J) to be all the time higher than the temperature of the heat transfer fluid (L). The invention also relates to an adjustment system.

A first conduit having a cylindrical upper entrance region with the axis of the cylindrical region oriented vertically, which accepts incoming downwardly flowing hot drain water, a central region of said first conduit below the said entrance region having a conical shape of increasing diameter, reaching a maximum diameter 2-7 times larger than the upper region, the shape then transitioning to a decreasing diameter area of a conical shape, the shape transitioning to a cylindrical lower region with a diameter similar to the upper region diameter; a second conduit for the flow of the shower cold water supply, with a diameter 10-40 times smaller than the maximum diameter of the drain water conduit, and a length 10-40 times longer than the vertical length of the drain water conduit, the second conduit tightly wrapped around the first conduit and in close thermal contact with the first conduit.

A heat exchange conduit includes a conduit body extending along a longitudinal axis between an inlet at one end thereof and an outlet at an opposed end. The conduit body has at least one conduit wall. At least one of said conduit walls is a heat-exchange wall shaped to be in heat exchange relationship with an object or fluid in contact therewith. An elongated turbulence strip is disposed within the conduit body and extends along a length thereof. The turbulence strip has longitudinally spaced-apart flow impact walls. Each flow impact wall has a peripheral rim and is perpendicular to the longitudinal axis. A flow gap for fluid flow is defined between at least a portion of the peripheral rim of each flow impact wall and an adjacent inner surface of the at least one conduit wall.

Systems and methods are disclosed for exchanging thermal energy between a drain liquid and a source liquid for heating or cooling of the source liquid. One method for heating a source liquid may involve transferring heat from a drain liquid using a heat pump. A system may include a refrigerant, a source liquid and a drain liquid, two or more heat exchangers that facilitate an exchange of thermal energy, and a means for transporting the refrigerant.