Integrated heat recovery system

Abstract

A system and method for integrated heat recovery from warm wastewater.

Description

[0001]INTEGRATED HEAT RECOVERY SYSTEM RELATED APPLICATIONS This application claims the benefit of priority under 35 USC §119(e) of U.S. Provisional Patent Application No. 63 / 448,292 filed 26 Feb. 2023, the contents of which are incorporated herein by reference in their entirety. FIELD AND BACKGROUND OF THE INVENTION The present invention, in some embodiments thereof, relates to a system and method for integrated heat recovery, and, more particularly, but not exclusively, heat recovery from warm wastewater. Global warming appears to have already caused an increase in average temperatures by 1.5 °C and had observable effects on the environment. Glaciers have shrunk, ice on rivers and lakes is breaking up earlier, plant and animal ranges have shifted, and trees are flowering sooner. Additionally, heat waves attributed to global warming present a greater risk of heat- related illness and death. Many attribute a significant portion of global warming to burning of fossil fuels. A portion of the heat produced by burning fossil fuels is wasted heat from households and industry (e.g., from refrigerators, air conditioners, baths, showers, electricity generation, household appliances, industrial processes, etc.). Wasting heat may result in increasing fossil fuel use and / or exacerbating global warming. Reusing waste heat can reduce the need for power from burning fossil fuels and / or reduce greenhouse gas production. Therefore, there is a need for a means of using and / or recycling waste heat. SUMMARY OF INVENTION The present invention, in some embodiments thereof, relates to a system and method for integrated heat recovery, and, more particularly, but not exclusively, heat recovery from warm wastewater. According to an aspect of some embodiments of the invention, there is provided a system for waste heat recovery including: a first heat exchange coil submerged in clean water the first heat exchange coil including a first channel through which a heat exchange fluid passes; a second heat exchange coil submerged in a warm fluid containing the waste heat the second heat exchange coil including a second channel through which the heat exchange fluid passes, the second channel in communication with the first channel. According to some embodiments of the invention, the warm fluid includes a waste fluid. According to some embodiments of the invention, the clean water is drinking water. According to some embodiments of the invention, the clean water is hotter than the warm fluid. According to some embodiments of the invention, the warm fluid includes wastewater. According to some embodiments of the invention, the warm fluid is collected from at least one of a shower, a bath, a basin, a dish washer, a washing machine, a tumble drier, an air- cooling system, an industrial process, a solar panel cooling system, or any combination thereof. According to some embodiments of the invention, the system further includes a compressor interconnecting between the first channel and the second channel and wherein the heat exchange fluid is a refrigerant. According to some embodiments of the invention, the system further includes an expansion valve between the compressor and the second channel. According to some embodiments of the invention, the system further includes a stirrer for increasing turbulence in the warm fluid. According to some embodiments of the invention, the stirrer includes at least one of a fin and a plate. According to some embodiments of the invention, the second heat exchange coil further including an ultrasonic vibrator. According to some embodiments of the invention, the system further includes an air heat exchanger. According to some embodiments of the invention, the first heat exchange coil is submersed in clean water stored in a first tank fluid flow. According to some embodiments of the invention, the system further includes a plurality of interconnected tanks storing the clean water and wherein each of the plurality of tanks is configured for receiving water directly from the first tank. According to some embodiments of the invention, the system further includes a plurality of interconnected tanks storing the clean water. According to some embodiments of the invention, the second heat exchange coil is submersed in warm fluid stored in a second tank. According to some embodiments of the invention, the system further includes a plurality of interconnected tanks storing the warm fluid and wherein each of the plurality of tanks is configured for sending the warm fluid directly to the second tank. According to some embodiments of the invention, the system further includes a plurality of interconnected tanks storing the warm fluid. According to an aspect of some embodiments of the invention, there is provided a system for reusing heat from wastewater including: a heat exchanger; and a first plurality of tanks in communication with a source of clean water; and wherein each tank of the first plurality of tanks is connected independently to the heat exchanger; a second tank in communication with a warm wastewater source and the heat exchanger. According to some embodiments of the invention, the second tank includes a second plurality of tanks and wherein each tank of the second plurality of tanks is connected independently to the heat exchanger. According to some embodiments of the invention, the heat exchanger is configured for transferring heat to the clean water from warm wastewater from the warm wastewater source. According to some embodiments of the invention, the system is configured to slowly transfer heat from any of the second plurality of tanks to any one of the first plurality of tanks. According to some embodiments of the invention, at least one of the first plurality of tanks and the second plurality of tanks is connected in series. According to some embodiments of the invention, the first plurality of tanks and / or the second plurality of tanks are connected concentrically. According to an aspect of some embodiments of the invention, there is provided a method of supplying hot water, the method including: collecting warm wastewater into a first tank with a heat exchanger; transferring heat to cold coolant by circulating cold coolant from a heat pump in coils inside the warm wastewater tank, wherein heat is extracted from the wastewater by heating the coolant in the coils; compressing the warmed coolant in a compressor producing a high-pressure; transferring the heated coolant from the compressor to coils inside a second tank with clean water; heating the clean water by the heated coolant in the coils inside the second tank; expanding the coolant through an expansion valve becoming a super cold low-pressure liquid / vapor mixture; returning the super cold liquid / vapor mixture to the first tank to be heated by the warm wastewater; and optionally, repeating the method. According to some embodiments of the invention, the heat exchanger includes coils, at least one of an evaporator and a pillow heat exchanger. According to some embodiments of the invention, the coolant is selected from the group consisting of a gas, a liquid / gas mixture, and a liquid. Implementation of the method and / or system of embodiments of the invention can involve performing or completing selected tasks manually, automatically, or a combination thereof. Moreover, according to actual instrumentation and equipment of embodiments of the method and / or system of the invention, several selected tasks could be implemented by hardware, by software or by firmware or by a combination thereof using an operating system . For example, hardware for performing selected tasks according to embodiments of the invention could be implemented as a chip or a circuit. As software, selected tasks according to embodiments of the invention could be implemented as a plurality of software instructions being executed by a computer using any suitable operating system. In an exemplary embodiment of the invention, one or more tasks according to exemplary embodiments of method and / or system as described herein are performed by a data processor, such as a computing platform for executing a plurality of instructions. Optionally, the data processor includes a volatile memory for storing instructions and / or data and / or a non-volatile storage, for example, a magnetic hard-disk and / or removable media, for storing instructions and / or data. Optionally, a network connection is provided as well. A display and / or a user input device such as a keyboard or mouse are optionally provided as well. DESCRIPTION OF THE DRAWINGS Some embodiments of the invention are herein described, by way of example only, with reference to the accompanying drawings. With specific reference now to the drawings in detail, it is stressed that the particulars shown are by way of example and for purposes of illustrative discussion of embodiments of the invention. In this regard, the description taken with the drawings makes apparent to those skilled in the art how embodiments of the invention may be practiced. Figs.1A-D are schematic diagrams of various views of a tank, in accordance with some embodiments of the current invention. Fig.2 is a schematic diagram of an integrated heat recovery system, in accordance with some embodiments of the current invention; Fig.3 is an exemplary image of a spiral pillow heat exchanger, in accordance with some embodiments of the current invention; Fig.4 is a schematic diagram of an integrated heat recovery system, in accordance with some embodiments of the current invention; Fig.5 is a schematic diagram of an integrated heat recovery system, in accordance with some embodiments of the current invention; Fig.6 us a schematic diagram of an integrated heat recovery system, in accordance with some embodiments of the current invention; Fig.7 is a schematic diagram of an integrated heat recovery system, in accordance with some embodiments of the current invention; Fig. 8 is a block diagram in accordance with an embodiment of the current invention; Fig.9 is a flow diagram of a method of heating water in accordance with an embodiment of the current invention; Fig. 10 is a schematic diagram of a system for heating water in accordance with an embodiment of the current invention; Fig.11 is a schematic diagram of a system for reversible heat transfer in a heating mode in accordance with an embodiment of the current invention; Fig.12 is a schematic diagram of a system for reversible heat transfer in a cooling mode in accordance with an embodiment of the current invention; Fig. 13 is a schematic diagram of a system for reversible heating and cooling in accordance with an embodiment of the current invention. DESCRIPTION OF THE INVENTION The present invention, in some embodiments thereof, relates to a system and method for integrated heat recovery, and, more particularly, but not exclusively, heat recovery from warm wastewater. OVERVIEW Some embodiments relate to a method and / or system for heat recovery. According to some embodiments, the system and / or method may be an integrated heat recovery system. According to some embodiments, the integrated heat recovery system may recover heat from warm wastewater. According to some embodiments, the integrated heat recovery system may be modular. According to some embodiments, the integrated heat recovery system may exchange heat from warm wastewater and / or additional heat sources to cold clean water. Alternatively, or additionally, heat from the warm wastewater will be concentrated by a heat pump and / or used for an industrial process, stored, used to heat a building and / or used to generate power (e.g., electricity), etc. Alternatively, or additionally, some embodiments may relate to a method of supplying hot water. According to some embodiments, the system may include a heat pump for transferring heat from a warm waste fluid to supply heat, for example to heat clean water. For example, the heat pump may facilitate raising a temperature of the clean water higher than a temperature of the heat source (e.g., the warm wastewater). Optionally, the heat pump may be designed with cold coils in direct contact with the warm waste fluid and hot coils in direct contact with the clean water. For example, heat exchange coils and / or a channel through which flows coolant (e.g., refrigerant) may be submerged in the warm waste flow (e.g., wastewater and / or heated air) and / or fluid being heated (e.g., clean water) For example, the condenser coil of the heat pump may be submerged directly in the clean water and / or the evaporator coil may be submerged directly in the waste heat carrier (e.g., the warm wastewater and / or outlet of a cooling system [e.g., a solar cell cooling system]). According to some embodiments, the system may recover heat from wastewater. Optionally, the system may be modular. Optionally, the system may include one or more heat exchangers and / or a heat pump. Optionally, the heat exchanger may transfer heat from a warm waste fluid to heat clean water. Optionally, the heat exchanger may be designed with cold coils in direct contact with the warm waste fluid and hot coils in direct contact with the clean water. Optionally, the heat exchanger may include a plurality of clean water tanks and / or a plurality of warm wastewater tanks. Optionally, each of the wastewater tanks and / or each of the clean water tanks may be connected independently to the heat exchanger. According to some embodiments, the system may transfer and / or store heat between multiple tanks. Optionally, the system may transfer heat at a variety of speeds, e.g., slowly over hours, rapidly over minutes, etc. Optionally, a low power heat exchanger may supply a large volume of hot water (e.g., by slowly heating and storing water in low demand times and continuing to heat and supply water at high demand times). Optionally, a low power heat exchanger may have a power ranging between about 10W to 500W and / or between 500W to 1 kW and / or 1 kW to about 5 kW, and / or between about 5kW to about 10 kW, and / or between about 10 kW to about 20 kW. According to some embodiments, the system may store hot water in an inner tank and cooler water in peripheral tanks, e.g., to conserve heat. Optionally, the tanks may be lined up a 1D array and / or a 2D array e.g., concentric array such as rings. In some cases, a waste flow may be continuous and not stored in tanks. In some cases, a clean flow may be continuous and not stored in tanks. According to some embodiments, the system may be used to transfer heat from one tank to the next. Optionally, the heat may gradually increase from tank to tank. Optionally, a very high final temperature may be achieved by transferring heated from a warm water stream using a small heat exchanger. Some embodiments may relate to a method of supplying hot water. As used herein, the term “drainage” may relate to used water coming from a building and / or an appliance, such as shower, washing machine, dishwasher, toilet and similar and / or an industrial process. Unless stated otherwise, the terms “dirty water” and “wastewater” are used interchangeably and may relate to grey water, and / or drainage, but can also represent sewage and / or drinkable water in some applications. Optionally, instead of warm wastewater, a warm flow of a valuable fluid may be used. For example, the valuable fluid may include clean (e.g., drinking water) and / or industrial fluids (e.g., lubricant, cleaning fluid, coolant etc.). In some embodiments, recovering heat from valuable fluid or waste fluid will be referred to recovery of waste heat. Unless stated otherwise, the term “clean water” may relate to drinkable water, technical water, or any other liquid used e.g., at the hot end of the heat pump. Unless stated otherwise, the terms “warm water,” “hot water,” “heat carrier,” and “heated medium” are used interchangeably, and may relate to a liquid, usually water, that may be heated e.g., by the hot portion of a heat pump. In some embodiments, warm fluid refers to a fluid of temperature ranging between 0 to 20 degrees C and / or between 20 to 40 degrees C and / or between 40 to 100 degrees C. According to some embodiments, the heat exchanger may include one or more tanks for wastewater, one or more tanks for clean water, one or more coils, fins, plates and / or tubes, which may contain a coolant. According to some embodiments, the one or more wastewater tanks and / or the one or more clean water tanks may be insulated. According to some embodiments, the one or more wastewater tanks and / or the one or more clean water tanks may include a stirrer (e.g., to increase turbulence and / or spread heat and / or inhibit settling of particles) and / or fins (e.g., to spread heat and / or accelerate heat exchange). According to some embodiments, each tank may hold a volume of liquid in the range between about 1 L to about 5 L, and / or between about 5 L to about 25 L, and / or between about 25 L to about 60 L, and / or between about 60 L to 120 L, between about 120 L to about 200 L and / or between about 200 L to about 500 L, and / or between about 500 L to about 1,000 L, and / or between about 1,000 L to about 5,000 L, and / or between about 5,000 L to about 10,000 L. According to some embodiments, each tank may have a diameter and / or a length of one or more sides in the range between about 25 cm to about 50 cm, between about 50 cm to about 100 cm, between about 100 cm to about 500 cm, between about 500 cm to about 1,000 cm, between about 1000 cm to about 5,000 cm and / or between about 5,000 cm to about 20,000 cm. According to some embodiments, each tank may be equipped with a heat exchanger, a heat pump, a plurality of sensors (for example, a temperature sensor and / or a sensor of water quality) and / or a processor. According to some embodiments, each tank may further include a dirty water release valve and / or a pump. Optionally, the pump may be submersible. Alternatively or additionally, a heat pump may be included between two or more tanks. According to some embodiments, the integrated heat recovery system may be modular. According to some embodiments, a unit of the integrated heat recovery system may include at least one tank with associated coils, pumps, sensors, processors, etc. Optionally, the integrated heat recovery system may include one or more modules and / or units. Optionally, the modules and / or units may be connected in series. Optionally, the modules and / or units may be connected in parallel. Optionally, the modules and / or units may be connected concentrically, e.g., with the hottest module in the center and the coolest module on the outside. Optionally, modular unit may include a tank and / or a heat pump and / or a heat exchanger. In some embodiments, modular units may be added to and / or removed from the system with / or changing existing units. According to some embodiments, the plurality of sensors may be supplied. Optionally, the sensors may be connected to at least one processor. According to some embodiments, the plurality of sensors may be selected from the group of sensors, including but not limited to, temperature, flow (of electricity and / or fluid), current (of electricity and / or fluid), voltage, moisture, pressure, water presence sensors, etc. According to some embodiments, each tank may include at least one temperature sensor. According to some embodiments, the processor may be able to estimate the amount of heat available in each of the tanks, and / or the expected performance of the heat pump under the current conditions, based at least in part, on a signal from one or more sensors. According to some embodiments, a processor may control the movement of wastewater through the system. According to some embodiments, a processor may control the movement of clean water through the system. According to some embodiments, a processor may control the movement of coolant through the system. According to some embodiments, the processor may be connected to a central control unit. According to some embodiments, the central control unit may be located locally and / or may be located remotely, e.g., cloud based. According to some embodiments, a sensor and / or a processor and / or a central control unit may be connected wirelessly. According to some embodiments, a sensor and / or a processor and / or a central control unit may be connected through one or more cables. According to some embodiments, the integrated heat recovery system may be integrated into a structure, e.g., a house, building, industrial plant, hotel, apartment building, power station, sports facility, public facility, medical facility, etc. Optionally, hot wastewater may flow through pipes in and / or on a structure into a wastewater tank, e.g., the pipes and / or wastewater tank may be located in a floor, walls, water treatment room, boiler room, etc. According to some embodiments, the wastewater tanks and / or clean water tanks may be positioned to reduce heat loss. According to some embodiments, the wastewater tanks and / or clean water tanks may be positioned to reduce the need for circulation pumps (e.g., by employing natural heat gradients and / or gravity, etc.). According to some embodiments, beneficial positioning of the wastewater tanks and / or clean water tanks may be when the wastewater tank that is located to facilitate drainage filling with the assistance of gravity. According to some embodiments, beneficial positioning of the wastewater tanks and / or clean water tanks may be placing the wastewater tanks and / or clean water tanks concentrically (e.g., inner cylinder and outer torus) to facilitate reduced heat loss and / or efficient heat recovery. According to some embodiments, there may be an array of wastewater tanks and / or clean water tanks. According to some embodiments, the temperature of the clean water may be raised to a temperature ranging between about 25℃ to about 35℃, and / or about 35℃ to 45℃, and / or about 45℃ to about 55℃, and / or about 55℃ to about 75℃, and / or about 75℃ to about 100℃. According to some embodiments, the integrated heat recovery system may collect warm wastewater from one or more sources into a single tank. Optionally, the integrated heat recovery system may collect warm wastewater from one or more sources into multiple tanks. Optionally, the integrated heat recovery system may collect warm wastewater from multiple sources into multiple tanks in accordance with predetermined criteria, e.g., water source water temperature, water pressure, etc. According to some embodiments, the warm wastewater may be collected from a shower, a bath, a basin, a dish washer, a washing machine, a tumble drier, an air-cooling system, an industrial process, a solar panel cooling system, and / or any additional suitable source. In some embodiments, warm fluid may be waste heat may be collected in clean fluid for example, from an industrial process and / or a cooling system (for example a solar panel cooling system). According to some embodiments, one or more tanks may be connected together. According to some embodiments, one or more tanks may be connected together in series and / or in parallel and / or concentrically, as a daisy-chain, etc. Optionally, the connector may be reversibly attachable to one or more tanks. Optionally, the connector may be a capillary canal, valve, piston, pipe, and / or pump. Optionally, the connected tanks may include one or more wastewater tanks. Optionally, the connected tanks may include one or more clean water tanks. Optionally, the connected tanks may include one or more wastewater tanks and / or clean water tanks at various temperatures. Optionally, the connected tanks may be connected sequentially to control their temperature, e.g., to raise and / or lower their temperature, to achieve a selected temperature and / or range of temperatures. Optionally, heat may be transferred from one tank to the next tank, e.g., sequentially. According to some embodiments, a tank may include one or more coils, stirrers, fins, plates and / or tubes. According to some embodiments, the coils, stirrers, fins, plates and / or tubes of a first tank may be connected to the coils, fins, plates and / or tubes of a second tank, etc. According to some embodiments, the coils, stirrers, fins, plates and / or tubes may include a coolant. According to some embodiments, the coolant may be a liquid, and / or a fluid, and / or a gas, and / or a liquid / gas mixture. According to some embodiments, the coolant may be compressible. According to some embodiments, the coils, stirrers, fins, plates and / or tubes may be connected to a compressor. In some embodiments, a stirrer may increase turbulence in a tank and / or inhibit settling of particles in the tank and / or increase heat transfer. Advantageously, according to some embodiments, the coils, stirrers, fins, plates and / or tubes containing the coolant may be located within the water tanks, making the heat exchanger very efficient and relatively cheap to build. According to some embodiments, a unit of the integrated heat recovery system may additionally include an air heat exchanger. According to some embodiments, the air heat exchanger may be operationally coupled to the heat pump compressor (e.g., as to transfer heat from air to cooled fluid (e.g., refrigerant) that has passed through an expansion valve and / or to transfer heat heated to air from hot fluid (e.g., refrigerant that has been compressed)). According to some embodiments, the central control unit may operate the dirty water heat exchanger, or air heat exchanger, or both. According to some embodiments, the exchangers may be coupled by expansion valves, by 3-way valves, and / or by individual valves to the hot portion and / or cold portion of a heat exchanger and / or to the compressor. In some embodiments heat exchangers are positioned contact with and / or submerged in one or more fluids (e.g., warm fluid including waste heat and / or clean water). In some embodiments, a heat transfer fluid is circulated between the heat exchangers. For example, the heat transfer fluid may pass through the heat exchangers. Optionally the heat transfer fluid provides an interconnection between the heat exchangers. Optionally, the heat transfer fluid (e.g., refrigerant) passes through a compressor and / or expansion valve while traveling between the heat exchangers, thereby facilitating active heat transfer between the fluids. In some embodiments, the interconnection between the exchangers (e.g., transferring heat between wastewater tanks and / or clean water tanks and / or transferring heat between air and a tank) may be arranged to facilitate heat rebalancing. In some embodiments, the interconnection between the exchangers (e.g., transferring heat between wastewater and / or clean water and / or transferring heat between air and a transferring fluid) may be arranged to pump hot and / or cold fluids to various locations and / or at different rates. For example, the system may be set up as a VRF (variable refrigerant flow) system. Additionally, or alternatively, a tank may include one or more interfaces to connect to an external heat pump (for example, an external VRF system). Optionally, an inverter heat pump may include adjustable available compressor volume and / or range, for example, which may be adjusted as a function of heating. In some embodiments, the heat exchangers may be connected and / or disconnected from a circuit including a heating element. In some embodiments, the heat exchangers may be connected and / or disconnected from a circuit including a cooling element. Optionally, the direction of the circuit (e.g., from heating to cooling or vice versa) may be reversed (e.g., switched from the cooling portion of the cycle to a heating portion of the cycle). Optionally, when an application of a heat exchanger changes (or is shut off), the overall amount of coolant (e.g., coolant gas and / or refrigerant) may also change. For example, the amount of coolant may be controlled to some extent by controlling at which pressure the disconnected heat exchangers contain the coolant. Optionally, the coolant may be under low pressure. Optionally, the term low pressure may relate to a pressure ranging between about 0.004 psi to about 0.903 psi. According to some embodiments, each wastewater unit may be coupled to a heat pump compressor via at least two valves. Optionally, the valves may connect and / or disconnect to the heat pump compressor individually. According to some embodiments, the valves may support system operation. Optionally, one or more valves may be opened and / or closed when some of the wastewater unit modules may not be functioning and / or may be undergoing maintenance, etc., without interrupting system service. According to some embodiments, a central control unit may be configured to control the order, timings and / or synchronization of the valves and / or the compressor. Optionally, the central control unit may be configured to control the pressure and / or coolant amount in the active coils, fins, plates and / or tubes. According to some embodiments, the range of heat pump regimes may be expanded in an inverter-like manner and / or may remove the need of a grey water-to-coolant heat exchanger and / or associated circulation pumps. According to some embodiments, the integrated heat recovery system may include a main exchange unit, and / or a plurality of heat exchangers coupled to a waste heat source (e.g., a tank transferring of warm waste fluid), a plurality of output tanks, one or more waste fluid feeding pump, an array of sensors (e.g., temperature, flow, current, voltage, pressure sensors, etc.), dirty fluid inlet, clean water outlet, and / or circulation pumps. Optionally, the system may include at various points various sensors (for example, temperature and / or pressure sensors). For example, the sensors may report conditions at various locations to a controller. Optionally, the controller may control the temperature, pressure and / or flow rate of coolant at various points around the system, for example, by controlling the valves and / or controlling the compressor / s. According to some embodiments, each waste heat unit may be included in a module. For example, the waste heat may be collected from a warm fluid (e.g., wastewater). Optionally, in the module, the wastewater tank may be operationally coupled to the main exchange unit. Optionally, in the module, the wastewater tank may be operationally coupled to another wastewater unit, e.g., in a daisy-chain, in series, in parallel, and / or concentrically. According to some embodiments, each dirty water module may contain one or more of a dirty water input, power input, control input, an insulated tank, etc. According to some embodiments, the wastewater module may contain a plurality of temperature sensors and / or pressure sensors and / or flow sensors. Optionally, the sensors may facilitate calculating the stored energy and / or the temperature distribution of the module. According to some embodiments, a module may contain an internal pump e.g., to feed the contents to a main wastewater heat exchanger. According to some embodiments, the wastewater module may contain a built-in heat exchanger. Optionally, the built-in heat exchanger may contain a coolant connection pipe and / or be coupled to a heat pump. According to some embodiments, some waste fluid units may be equipped with a self- cleaning mechanism. According to some embodiments, one or more of the heat exchangers may be equipped with a cleaning mechanism. Optionally, this mechanism may perform mechanical cleaning. Optionally, one or more of the heat exchangers may be equipped with an ultrasonic cleaning system. Additionally, or alternatively, vibration may be used to improve mixing and / or heat transfer. For example, ultrasonic inducers may be used for cleaning and / or mixing fluid. According to some embodiments, the system may include additional features which may improve the efficiency of the process, such as facilitating induced circulation through heat exchangers. Optionally, the induced circulation mechanism may be separate from the cleaning mechanism. According to some embodiments, an air heat exchanger module may be coupled to the system. Optionally, the air heat exchanger may be used instead of a wastewater unit. Optionally, the air heat exchanger may be used in combination with a wastewater unit. Optionally, the wastewater unit and / or the air heat exchanger may work simultaneously or as a single heat exchanger. According to some embodiments, an outside heat exchanger may be coupled to the system along with and / or instead of the wastewater unit. Optionally, the outside heat source may be waste heat (e.g., from air conditioning units, ovens, industrial heating units, server farms, computational and / or laboratory infrastructure, composting, etc.), and / or heat from a solar energy system, and / or from direct sunlight, and / or indirect sunlight, etc. According to some embodiments, the central control unit may be able to evaluate the efficiency of the system configuration from sensor reading (such as a coefficient of performance of the heat pump, the cost of operation in terms of energy, and / or money, including the costs of system reconfiguration) Optionally, the central control unit may be able to evaluate the efficiency of the system configuration from sensor reading to operate within predefined efficiency margins. Optionally, the predefined efficiency margins may be defined by an operator and / or by the system itself. For example, the system may be set to only operate when the coefficient of performance is above 10 during electricity peak hours and to operate when the coefficient of performance is above 7 during non-peak hours. According to some embodiments, the system may be able to reduce the number of on-off cycles of a heat pump by maintaining specific amounts of energy in the wastewater tanks. According to some embodiments, the system may perform a delayed operation. According to some embodiments, the system may perform a scheduled operation. According to some embodiments, the system may collect dirty water for a set period of time. According to some embodiments, the system may be turned on when specific conditions are being met, e.g., efficiency, coefficient of performance, minimum heat pump working time, electricity price, etc. According to some embodiments, at least part of the system may be made from recycled and / or recyclable materials. According to some embodiments, at least part of the system may be recyclable and / or reusable. According to some embodiments, a method for recovering heat using an integrated heat exchanger may include: · Warm wastewater is collected into a first tank with a heat exchanger (e.g., coils and / or an evaporator and / or a pillow heat exchanger) transferring heat to cold coolant (optionally, the coolant may include gas and / or a liquid / gas mixture and / or be under low pressure). · Super cold coolant from the heat pump is circulated in the coils inside the warm wastewater tank. · The heat is extracted from the wastewater by heating up the coolant in the coils. · The warmed coolant becomes slightly superheated gas and is sent to a compressor and compressed, causing it to become a high-pressure, high- temperature superheated vapor. · The compressed very hot vapor coolant is sent to coils inside a second tank with clean water to heat the clean water by the heated coolant in coils inside that tank where it condensed into a high-pressure saturated liquid. · Then the cooled coolant goes to the expansion valve where, after a pressure drop, it boils and becomes super cold low-pressure liquid / vapor mixture. · The super cold coolant is returned to the first tank to be heated by the warm wastewater. · The process is then repeated from the beginning. The above description is exemplary. Alternatively, or additionally, in some embodiments, at various stages in the process, the coolant may take a form different from that described above. For example, where the coolant is described as a liquid / vapor mixture, it may be either a liquid or a vapor. For example, where the coolant is described as a liquid or a vapor, it may be a liquid / vapor mixture. SPECIFIC EMBODIMENTS Before explaining at least one embodiment of the invention in detail, it is to be understood that the invention is not necessarily limited in its application to the details of construction and the arrangement of the components and / or methods set forth in the following description and / or illustrated in the drawings and / or the Examples. The invention is capable of other embodiments or of being practiced or carried out in various ways. Reference is now made to the drawings. Figs. 1A-D are schematic diagrams of various views of a heat exchanger tank, in accordance with some embodiments of the current invention. For example, tank 100 may include wastewater 106. Optionally, tank 100 may include a mechanism for stirring (for example, stirrer 102) and / or cleaning the tank. Optionally, tank 100 may include multiple coils, fins, plates, tubes and / or tubes within fins through which coolant may flow. For example, the fins 104 may include a pillow heat exchanger. Optionally, tank 100 may include concentric layers of coils, fins, plates, tubes and / or tubes within fins through which coolant may flow. Optionally, such an arrangement may result in increased heat transfer (e.g., advection). For example, the stirrer 102 may facilitate enhanced forced advection and / or the size and shape of the coils / fins 104 may facilitate enhanced diffusion and / or natural advection. Optionally, the system may include one or more modules. Optionally, the system may run while one or more modules are shut down for cleaning. Fig.2 is a schematic diagram of an integrated heat recovery system, in accordance with some embodiments of the current invention. For example, the integrated heat recovery system may include one or more hot entry pipes 200 for waste heat (e.g., stored in warm wastewater). For example, entry pipes 200 may convey hot and / or warm wastewater into a wastewater tank 202. Optionally, the wastewater tank 202 may be a ring tank (e.g., a toroidal tank). Optionally, tubes (e.g., coils 204) of cold coolant (e.g., refrigerant and / or coolant gas) may be located directly within the wastewater tank, optionally, such coolant tubes may be cheaper to build and / or may provide higher efficiency heat transfer. Heat may then be transferred from the hot wastewater in the wastewater tank 202 to the coolant within the coils 204. The now hot coolant may then pass through a heat pump 206 which may compress the coolant into a hot liquid, which may be pumped into coils 210 in a tank 208 of clean cold water. Clean water may be pumped into the clean water tanks by a cold-water entry pipe 220. The hot coolant then transfers the heat to the clean cold water in the cold-water tank 208, thereby heating the clean water using the heat from the hot wastewater and / or cooling the coolant. The cooled coolant then passes back to the heat pump 206, e.g., via an expansion valve, where it is expanded and / or cooled further, before being returned to the wastewater tank 202. Wastewater that has been cooled by heat transferring heat to the coolant may be pumped out of a cold wastewater exit pipe 212. For example, the exit pipe may lead into a central drainage system, e.g., a municipal drainage system. The heated clean water may then be passed through one or more hot clean water exit pipes 214 for use, e.g., in a shower, dishwasher, washing machine, industrial process, etc. Optionally, the cold-water tank 208 may include a release valve 222 e.g., to release the pressure, store heat and / or rapidly cool the system and / or a magnesium rod 224 e.g., to inhibit corrosion. Optionally, the cold-water tank 208 may include a drain 226. Optionally, one or more sensors 216 may be connected to a processor 218 which may control the system. For example, the sensors 216 may include temperature sensors, pressure sensors, and / or other sensors. Alternatively, or additionally, heat from the heat pump may be used directly for an industrial process and / or to generate power (e.g., electricity), etc. Note cold water entering is cold with respect to the clean hot water exiting, but may be hotter than the hot wastewater. Fig.3 is an exemplary photograph of a spiral pillow heat exchanger, in accordance with some embodiments of the current invention. For example, a heat exchanger 300 which may be used as described herein may be a pillow plate wall, pillow plate internal, spiral, double wall, flat pillow plate array, a circular array, a curved array or any other heat exchanger suitable for the specified medium and / or environment. Heat exchanger 300 may include an inlet 302 and an outlet 304 to transfer heat from wastewater 306 to clean water (not shown). Fig. 4 is a schematic diagram of an integrated heat recovery system 400, in accordance with some embodiments of the current invention. For example, the integrated heat recovery system may include one or more hot waste heat entry pipes 401, which may convey hot wastewater and / or waste steam and / or another fluid including waste heat into a waste heat tank 404, optionally equipped with a steam release valve 402. Optionally, tubes of cold coolant 406 (e.g., refrigerant and / or coolant gas) may be located directly within the waste heat tank 404. Heat may then be transferred from the hot fluid (e.g., wastewater and / or waste steam) to the coolant within the coils. The now hot coolant may then pass through a heat pump and / or compressor 408 which may compress the coolant into a high-pressure, high-temperature superheated coolant (which may include be in a vapor and / or fluid form), which may be pumped into coils 410 in a tank 412 of clean cold water. Clean cold water may enter the clean water tank 412 via one or more clean water entry pipes 424. The hot coolant then transfers the heat to the clean cold water, thereby heating the clean water using the heat from the hot wastewater and / or waste steam. Optionally, the clean water may be heated to convert it to steam, e.g., for an industrial process, generation of electricity, etc. Optionally, the clean water may include a release valve 414. The cool coolant then passes back to the compressor 408 and / or expansion valve 409, where it is expanded and / or cooled further, before being returned to the wastewater tank 404. Cooled wastewater is optionally pumped out of the cold wastewater exit pipe 416 into a central drainage system 428, e.g., a municipal drainage system. The heated clean water and / or steam may then be passed through one or more hot clean water exit pipes 418 for use, e.g., in a shower, dishwasher, washing machine, industrial process, etc. Optionally, one or more sensors 420 may be connected to a processor 422 which may control the system. For example, the sensors may include pressure sensors and / or temperature sensors. Optionally, the sensors may measure energy source sinks. Optionally, the cold-water tank 412 may include a release valve 414 and / or a magnesium rod 426 e.g., to release the pressure, store heat and / or rapidly cool the system, if required. Fig.5 is a schematic diagram of an integrated heat recovery system, in accordance with some embodiments of the current invention. For example, the integrated heat recovery system may be a modular system. Optionally, a plurality of tanks may be connected to a heat recovery system 501 (e.g., heat recovery system 400 and / or heat recovery system 701) including a heat pump 500. Optionally, warm wastewater from many sources may be collected into a plurality of wastewater tanks 502. Optionally, clean water is circulated among clean water tanks 510. The warm wastewater from any of tanks 502 is pumped into the waste tank of the heat recovery system. The clean water from any of clean water tanks 510 is pumped into the clean water side of heat recovery system 501. In some embodiments, the heat pump 500 may be run at a selected time of day, e.g., cheap electricity and / or high requirement for clean hot water, etc. to transfer waste heat from the wastewater side of heat recovery system 501 to the clean water side. Optionally, the heated water is distributed among the clean water tanks 510 to achieve a desired distribution of water at various temperatures. Optionally, water may be heated over a long time using a small heating system. Optionally, a small heat exchange over a long time may require use of a smaller system. The system may include one or more automatic valves 504. A controller 506 may control one or more automatic valves 508 to distribute heat back and forth between the heat pump 500 (e.g., compressor) through various portions of the system and / or between different water tanks. The control may facilitate transferring heat (e.g., hot or cold water) to individual tanks as desired. Optionally, valves may include a local programmable controller and / or may be controlled by a central controller. Connections between the controller and the valves may be via wireless and / or wired connections. In some embodiments, heat exchange coils may be included in one pair of tanks (e.g., one tank for fluid with waste heat (warm wastewater) and one tank with fluid to be heated (e.g., clean water)). Optionally, fluid will be circulated back and forth between tanks without heat exchange cools and the tank with heat exchange coils to heat and cool the fluids. Alternately or additionally, heat exchange coils may be supplied in multiple tanks and / or all of the tanks. Fig.6 is a schematic diagram of an integrated heat recovery system, in accordance with some embodiments of the current invention. For example, the integrated heat recovery system may be a modular system. Optionally, the tanks may include connectors and / or standard mountings, etc. which may be ready to connect one to another and / or connect to the system. Optionally, the size of the system may be adjusted depending on the needs of the user by adding and / or removing modular units. Optionally, the system may include a 2D and / or 3D array of tanks. Optionally, the tanks may be cylindrical, cubic, etc. Optionally, the heat exchanger may be selected to fit the size and / or shape of the tank, e.g., a rectangular tank may use a flat heat exchanger, etc. For example, warm wastewater may be used to heat clean water. Optionally, the system includes automatic valves 600 controlled by local and / or a central controller. In some embodiments, a circulation pump 604 may be included, for example, to direct fluids to achieve a desired flow of water at a desired temperature efficiently. Optionally, clean water may be carried through one or more circulatory pipes 606 between one or more clean water tanks 610 and a clean water side of one or more heat recover systems 611 (where heat is transferred between the waste heat source and the clean water e.g., system 400 and / or system 701). The hot clean water may exit through one or more valves 602 on the circulatory pipes 608. Optionally, fluid from one or more heat sources and / or at one or more different temperatures is stored is waste heat tanks 612. Optionally, fluid containing the waste heat may be circulated between different tanks 612 and / or between any of tanks 612 and the heat recovery system 611. According to some embodiments, the integrated heat recovery system may be integrated into a structure, e.g., a house, building, industrial plant, hotel, apartment building, power station, etc. Optionally, hot wastewater may flow through pipes in the floor of a structure into a wastewater tank. Optionally, the floor of a structure may need to be raised to accommodate the integrated heat recovery system. Optionally, low tanks may be used so as not to raise the floor. According to some embodiments, the system may include one or more modules. Optionally, the system may run while one or more modules are shut down. For example, units may be shut down for cleaning and / or maintenance. Optionally, the system may include a cleaning mode. Optionally, the system may only run some tanks, e.g., tanks closest to the wastewater source so as to reduce heat loss during transport of the hot wastewater to the wastewater tank. Fig. 7 is a schematic diagram of an integrated heat recovery system 701, in accordance with some embodiments of the current invention. For example, the integrated heat recovery system may include one or more hot wastewater entry pipes 700, which may convey hot wastewater and / or waste steam into a wastewater tank 702. Optionally, tubes (e.g., coils 704) of cold coolant (e.g., refrigerant and / or coolant gas) may be located directly within the wastewater tank 702. Heat may then be transferred from the hot wastewater and / or waste steam to the coolant within the coils 704. Optionally, the coolant may be heated and / or cooled by an air heat exchanger 708, e.g., when the heat from the hot wastewater is insufficient. Optionally, the integrated heat recovery system may additionally include an air heat exchanger. Optionally, the air heat exchanger may be operationally coupled to the heat pump 710 compressor. Optionally, a processor 712 may operate the dirty water heat exchanger, and / or air heat exchanger, or both. The hot coolant may then pass through a compressor which may compress the coolant into a high-pressure, high-temperature superheated vapor, which may be pumped into coils 716 in a tank 714 of clean cold water. The hot coolant then transfers the heat to the clean cold water in a clean water tank 714 which enters through one or more cold clean water entry pipes 724, thereby heating the clean water using the heat from the hot wastewater and / or waste steam. Optionally, the clean water may be heated to convert it to steam e.g., for an industrial process, generation of electricity, etc. The cool coolant then passes back to the expansion valve, where it is expanded and / or cooled further, before being returned to the wastewater tank 702. Once the wastewater has cooled to a degree insufficient for heat transfer, it is pumped out of the cold wastewater exit pipe 718 into a central drainage system, e.g., a municipal drainage system. The heated clean water and / or steam may then be passed through one or more hot clean water exit pipes 720 for use, e.g., in a shower, dishwasher, washing machine, industrial process, etc. Optionally, one or more sensors 722 may be connected to a processor which may control the system. Fig. 8 is a block diagram in accordance with an embodiment of the current invention. For example, the integrated heat recovery system may include a waste heat tank 800 containing a fluid with waste heat ((e.g., warm wastewater and / or exhaust fluid from a cooling system). Tubes of cold coolant (e.g., an evaporator coil 802 with cold refrigerant) may be located directly within the wastewater tank and / or submerged in the fluid. Heat may then be transferred from the warm wastewater to the coolant in a condenser coil 802. The warmed coolant may then pass through compressor 804 which may compress the coolant into a high-pressure, high- temperature fluid (e.g., refrigerant vapor) which is sent to a condenser coil 806 in a tank 808 of clean water. The hot coolant then transfers the heat (e.g., through the walls of coils 806) to the clean water in tank 808, thereby heating the clean water using the heat from the hot wastewater. Note that the due to the heat pump effect, the system may be used to heat clean water to a temperature above the temperature of the heat source (e.g., the warm wastewater in the waste heat tank). Optionally, the process may be reversed using an expansion valve (not shown). Fig. 9 is a flow diagram in accordance with an embodiment of the current invention. For example, in method 900 for recovering heat using an integrated heat exchanger may include: · Warm wastewater is collected 902 into a first tank with coils containing cold coolant. · Super cold coolant from the heat pump is circulated 904 in the coils inside the warm wastewater tank. · The heat is extracted 906 from the wastewater by heating up the coolant in the coils · The warmed coolant is sent 908 to a compressor and compressed, causing it to become a high-pressure, high-temperature superheated vapor. · The compressed very hot coolant is sent 910 to coils inside a second tank with clean water. · The very hot coolant is used to heat 912 the clean water by the heated coolant in coils inside that tank. · Then the cooled coolant is returned 914 to the expansion valve, where it is expanded and / or cooled further. · The super cold coolant is returned 916 to the first tank to be heated by the warm wastewater. · The process is then be repeated from the beginning. These embodiments are provided by way of example and are in no means intended to be limiting the scope of the invention. Fig. 10 is a schematic diagram of a system for heating water in accordance with an embodiment of the current invention. For example, the system may include an air heat exchange unit. Optionally, the system may not include an overheating protection system, e.g., for a solar thermal module. In some embodiments, heat may be transferred from waste heat (for example warm wastewater 1002) to clean water in a clean water tank 1004 (i.e., pumping coolant between a compressor and / or expansion valve and / or heat exchangers in the tanks). Optionally, the system may include a backup heat source (e.g., an air heat exchanger 1006 that can warm cooled coolant from ambient air). For example, after the coolant is expanded at the expansion valve 1008, it may be warmed by the ambient air and / or the wastewater and then compressed by a compressor 1010 to produce heated coolant which may be used to heat clean water. Optionally the clean water flow may include solar heating of the clean water and / or the wastewater. Figs. 11 and 12 are schematic diagrams of a refrigerant flow scheme system for reversible heat transfer in a heating mode and a cooling mode, respectively, in accordance with an embodiment of the current invention. For example, in the system the air unit and with overheating protection for a solar thermal module in a heating mode (e.g., Fig. 11) or in a cooling mode (e.g., Fig. 12) overheating protection may be included. In some embodiments, heat may be transferred from waste heat (for example, warm wastewater and / or waste steam in a warm wastewater tank 1102) to clean water in a clean water tank 1104. Optionally, the system may include a backup heat source (e.g., an air heat exchanger 1106 that can warm cooled coolant from ambient air). Optionally the clean water flow may include solar heating of the clean water. In the heating mode, flow may be similar to the system of Fig. 10. In some embodiments, heat flow may be reversible (e.g., by reversing the direction of flow of the coolant for example through a reversing valve 1108 as illustrated in Fig. 12). For example, coolant may be compressed by a compressor 1110 to high temperature and pressure and then cooled by the ambient air and / or the wastewater. The cooled compressed coolant may be allowed to expand and further cool in the expansion valve 1112 and sent to cool off the clean water. Optionally, the heat may be transferred through a heat exchanger 1116 from overheated clean water (e.g., when the solar heating system may become overheated) to coolant which is compressed and then cooled by the ambient air and / or the wastewater flow, e.g., by a check valve 1114. For example, this may be used to prevent the solar water heating system from overheating. Fig. 13 is a schematic diagram of a system for reversible heating and cooling in accordance with an embodiment of the current invention. For example, the heat system may include a variable refrigerant flow system with an air unit, with overheating protection for a solar thermal module for air conditioning indoor unit / units 1308. In some embodiments, a system may have flow that can be reversed and / or redirected in multiple circuits. For example, the system may include an air transfer unit 1308 (e.g., air conditioner unit). Coolant may be directed in either direction e.g., in the indoor circuit in a heating mode to heat a room and / or in a cooling mode to cool the room. Another circuit optionally transfers heat and / or absorbs heat from a wastewater flow 1306. A further circuit transfers heat to or absorbs heat from a clean water flow 1304. Optionally, there may also be a thermal solar collector (for example, for heating the clean water). Thus, the system can be used like existing heat pump climate control systems to transfer heat with ambient air to heat or cool a building. When a wastewater flow is available, the system may use the wastewater 1306 as a heat source and / or heat sink. Additionally, or alternatively, the system may heat clean water and / or cool the clean water (e.g., to prevent overheating of the solar water heating system). Additionally, or alternatively, the system may harness heat from the solar water heater to heat a building (e.g., when there is reduced need for hot water). In the exemplary configuration illustrated in Fig.13, the heating of the hot water is used as a heat sink for an air conditioner of the climate control system, e.g., by a heat exchanger 1302. This may increase efficiency by using the heat transferred to the hot water simultaneously in the cooling cycle of the heat pump and for heating clean water. Heat from the wastewater flow may optionally be used to heat the clean water. In some embodiments, by redirecting coolant amongst various circuits of the system the system may provide heat or cooling of various portions of the system., for example, by opening and closing valves 1310, 1312. For example, in the summer, the wastewater flow may be cooler than the ambient air. For example, after compressing the coolant using a compressor 1314 it may be partially cooled in the ambient atmosphere and then further cooled in the wastewater flow and / or clean water. The cooled high-pressure coolant may then be passed through the expansion valves 1316, becoming cold and then sent to the indoor air conditioner. Alternatively, or additionally, for example, when the ambient air is cooler than the waste flow, after compression, the hot compressed coolant may be sent first to be cooled in the clean water and / or wastewater flow and then further cooled in the ambient atmosphere before being sent to the expansion valve, cooled and used to cool the indoor air conditioner. For example, in the winter, after expanding in the expansion valve, cold coolant may be warmed in the wastewater, sent to the compressor, compressed and used to heat the inside (e.g., using the indoor air conditioner unit as a heater). Optionally, the system may include an air heat exchanger 1318. Optionally, the air heat exchanger may be used in a conjunction with and / or instead of a water heat exchanger. Optionally, the system may include a check valve 1320. Optionally, the system may include one or more sensors. While the invention has been described in its preferred form or embodiment with some degree of particularity, it is understood that this description has been given only by way of example and that numerous changes in the details of construction, fabrication, and use, including the combination and arrangement of parts, may be made without departing from the spirit and scope of the invention. GENERAL It is expected that during the life of a patent maturing from this application, many relevant building technologies, artificial intelligence methodologies, computer user interfaces, image capture devices will be developed and the scope of the terms for design elements, analysis routines, user devices is intended to include all such new technologies a priori. Unless otherwise defined, all technical and / or scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the invention pertains. Although methods and materials similar or equivalent to those described herein may be used in the practice or testing of embodiments of the invention, exemplary methods and / or materials are described below. In case of conflict, the patent specification, including definitions, will control. In addition, the materials, methods, and examples are illustrative only and are not intended to be necessarily limiting. As used herein, the term “about” refers to ± 10% The terms “comprises,” “comprising,” “includes,” “including,” “having” and their conjugates mean “including but not limited to.” The term “consisting of” means “including and limited to.” The term “consisting essentially of” means that the composition, method or structure may include additional ingredients, steps and / or parts, but only if the additional ingredients, steps and / or parts do not materially alter the basic and novel characteristics of the claimed composition, method or structure. As used herein, the singular form “a,” “an” and “the” include plural references unless the context clearly dictates otherwise. It is expected that during the life of a patent maturing from this application, many relevant energy generating and distributing technologies will be developed and the scope of the terms “heat generating,” “heat exchanging,” “heat pump,” “valve,” “sensor,” “coolant,” refrigerant” are intended to include all such new technologies a priori. Throughout this application, various embodiments of this invention may be presented in a range format. It should be understood that the description in range format is merely for convenience and brevity and should not be construed as an inflexible limitation on the scope of the invention. Accordingly, the description of a range should be considered to have specifically disclosed all the possible subranges as well as individual numerical values within that range. For example, a description of a range such as from 1 to 6 should be considered to have specifically disclosed subranges such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as individual numbers within that range, for example, 1, 2, 3, 4, 5, and 6. This applies regardless of the breadth of the range. Whenever a numerical range is indicated herein, it is meant to include any cited numeral (fractional or integral) within the indicated range. The phrases “ranging / ranges between” a first indicate number and a second indicate number and “ranging / ranges from” a first indicate number “to” a second indicate number are used herein interchangeably and are meant to include the first and second indicated numbers and all the fractional and integral numerals therebetween. In addition, it is to be understood that the described elements may be combined in any suitable manner in the various embodiments. In addition, for the purposes of the present disclosure, directional or positional terms such as “top,” “bottom,” “upper,” “lower,” "side," "front," "frontal," "forward," "rear," "rearward," "back," "trailing," "above," "below," "left," "right," "horizontal," "vertical," "upward," "downward," "outer," "inner," "exterior," "interior," "intermediate," etc., are merely used for convenience in describing the various embodiments of the present disclosure. As used herein, the terms “hot”, “cold”, “warm”, “cool” are relative terms and are merely used for convenience in describing the various embodiments of the present disclosure. As used herein, the term “plurality” relates to one or more of an item, e.g., 1, 2, 3, 4, 5, …10, 15, 20, …50, …100, …1,000, etc. and or any subrange. The term "coupled," including its various forms such as "operably coupled," "coupling" or "couplable," refers to and comprises any direct or indirect, structural coupling, connection or attachment, or adaptation or capability for such a direct or indirect structural or operational coupling, connection or attachment, including integrally formed components and components which are coupled via or through another component or by the forming process. Indirect coupling may involve coupling through an intermediary member or adhesive, or abutting and otherwise resting against, whether frictionally or by separate means without any physical connection. This term may also refer to other system component which can serve functionality of the system. It is appreciated that certain features of the invention, which are, for clarity, described in the context of separate embodiments, may also be provided in combination in a single embodiment. Conversely, various features of the invention, which are, for brevity, described in the context of a single embodiment, may also be provided separately or in any suitable sub- combination or as suitable in any other described embodiment of the invention. Certain features described in the context of various embodiments are not to be considered essential features of those embodiments, unless the embodiment is inoperative without those elements. Although the invention has been described in conjunction with specific embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art. Accordingly, it is intended to embrace all such alternatives, modifications and variations that fall within the spirit and broad scope of the appended claims. All publications, patents and patent applications mentioned in this specification are herein incorporated in their entirety by reference into the specification, to the same extent as if each individual publication, patent or patent application was specifically and individually indicated to be incorporated herein by reference. In addition, citation or identification of any reference in this application shall not be construed as an admission that such reference is available as prior art to the present invention. To the extent that section headings are used, they should not be construed as necessarily limiting.

Claims

CLAIMS What is claimed is:

1. A system for waste heat recovery comprising: a first heat exchange coil submerged in clean water said first heat exchange coil including a first channel through which a heat exchange fluid passes; a second heat exchange coil submerged in a warm fluid containing the waste heat said second heat exchange coil including a second channel through which said heat exchange fluid passes, said second channel in communication with said first channel.

2. The system of claim 1, wherein said warm fluid includes a waste fluid.

3. The system of claim 1, wherein said clean water is drinking water.

4. The system of claim 1, wherein said clean water is hotter than said warm fluid.

5. The system of claim 1, wherein the warm fluid includes wastewater.

6. The system of claim 5, wherein said warm fluid is collected from at least one of a shower, a bath, a basin, a dish washer, a washing machine, a tumble drier, an air-cooling system, an industrial process, a solar panel cooling system, or any combination thereof.

7. The system of claim 1, further comprising a compressor interconnecting between said first channel and said second channel and wherein said heat exchange fluid is a refrigerant.

8. The system of claim 7, further comprising an expansion valve between said compressor and said second channel.

9. The system of claim 1, further comprising a stirrer for increasing turbulence in said warm fluid.

10. The system of claim 9, wherein the stirrer comprises at least one of a fin and a plate.

11. The system of claim 1, wherein said second heat exchange coil further comprising an ul- trasonic vibrator.

12. The system of claim 1, further comprising an air heat exchanger.

13. The system of claim 1, wherein said first heat exchange coil is submersed in clean water stored in a first tank fluid flow.

14. The system of claim 13, further comprising a plurality of interconnected tanks storing said clean water and wherein each of said plurality of tanks is configured for receiving water directly from said first tank.

15. The system of claim 1, further comprising a plurality of interconnected tanks storing said clean water.

16. The system of claim 1, wherein said second heat exchange coil is submersed in warm fluid stored in a second tank.

17. The system of claim 16, further comprising a plurality of interconnected tanks storing said warm fluid and wherein each of said plurality of tanks is configured for sending said warm fluid directly to said second tank.

18. The system of claim 1, further comprising a plurality of interconnected tanks storing said warm fluid.

19. A system for reusing heat from wastewater comprising: a heat exchanger; and a first plurality of tanks in communication with a source of clean water; and wherein each tank of the first plurality of tanks is connected independently to the heat exchanger; a second tank in communication with a warm wastewater source and said heat ex- changer.

20. The system of claim 19 wherein said second tank includes a second plurality of tanks and wherein each tank of the second plurality of tanks is connected independently to the heat ex- changer.

21. The system of claim 19, wherein the heat exchanger is configured for transferring heat to the clean water from warm wastewater from the warm wastewater source.

22. The system of claim 20, wherein the system is configured to slowly transfer heat from any of said second plurality of tanks to any one of said first plurality of tanks.

23. The system of claim 20, wherein at least one of the first plurality of tanks and the second plurality of tanks is connected in series.

24. The system of claim 20, wherein the first plurality of tanks and / or the second plurality of tanks are connected concentrically.

25. A method of supplying hot water, the method comprising: collecting warm wastewater into a first tank with a heat exchanger; transferring heat to cold coolant by circulating cold coolant from a heat pump in coils inside the warm wastewater tank, wherein heat is extracted from the wastewater by heating the coolant in the coils; compressing the warmed coolant in a compressor producing a high-pressure; transferring the heated coolant from the compressor to coils inside a second tank with clean water; heating the clean water by the heated coolant in the coils inside the second tank; expanding the coolant through an expansion valve becoming a super cold low-pressure liquid / vapor mixture; returning the super cold liquid / vapor mixture to the first tank to be heated by the warm wastewater; and optionally, repeating the method.

26. The method of claim 25, wherein the heat exchanger comprises coils, at least one of an evaporator and a pillow heat exchanger.

27. The method of claim 25, wherein the coolant is selected from the group consisting of a gas, a liquid / gas mixture, and a liquid.

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