Public kitchen dish washing machine waste water heat recycling device, method and system

Abstract

The invention relates to the technical field of waste water heat recovery. The invention discloses a waste water heat recycling device, method and system for a public kitchen dish washing machine. Comprising a data collection module used for reading, collecting and storing related data of waste water waste heat recovery of a public kitchen dish-washing machine and operation of a water heating system; the control module is used for controlling the water tank to supplement water and controlling the indirect sewage source heat pump unit to start and stop; and the waste heat recycling and water heating module is used for recycling waste heat and storing and preparing hot water. Heat of waste water discharged from the dish-washing machine to the oil separation tank is extracted through heat exchange, tap water is heated through the indirect sewage source heat pump unit and supplied to the dish-washing machine, and electric energy consumed by heating the tap water when the dish-washing machine works is reduced. Through the combination of the data collection module and the control module, the system can recycle heat in wastewater in the oil separation tank as much as possible on the premise of ensuring that the water temperature in the oil separation tank is not too low and ensuring the drainage safety.

Description

Technical Field

[0001] The present invention relates to the technical field of wastewater heat recovery, and in particular to a device, method and system for recovering heat from dishwasher wastewater in a public kitchen. Background Art

[0002] In the use of traditional large-scale commercial dishwashers in kitchens, the rinse water temperature needs to reach 80~90℃. Heating this part of tap water consumes a lot of energy. At the same time, the hot wastewater discharged during the use of the dishwasher is generally discharged into the grease trap, and then discharged into the municipal sewage pipe after grease separation treatment. If a large amount of water is discharged in a short period of time, the temperature of the wastewater discharged into the municipal sewage pipe may be higher than 35℃, which does not meet the regulatory requirements and requires the addition of a cooling pool.

[0003] Prior art 1, Chinese patent No. 202420610148.6, discloses a device for heat recovery and reuse of bathing and domestic wastewater, relating to the field of wastewater resource reuse technology. The device comprises a wastewater pipe, one end of which is fixedly connected to a filter device, one end of which is fixedly connected to a water pump, and one end of which is fixedly connected to a heat exchange device. The heat exchange device comprises an upper guide rod, a lower guide rod extending through a rear end plate and fixedly connected to one end of a support, and a plurality of heat exchange plates clamped between the front and rear plates. The inner walls of two circular grooves on one side are respectively fixedly connected to a hot inlet pipe and a hot outlet pipe, while the inner walls of two circular grooves on the other side are respectively fixedly connected to a cold inlet pipe and a cold outlet pipe, with one end of the hot inlet pipe fixedly connected to one end of the water pump. Although the provision of a heat exchange device and a filter device reduces costs, converts heat energy, and filters wastewater to protect the heat exchange device, it is important to note that the temperature of dishwasher wastewater can reach above 80°C. The concentrated discharge of large amounts of wastewater above 80°C may cause thermal pollution.

[0004] Prior art two, Chinese patent, patent number: 202510343206.2 provides a residual water treatment device and a dishwasher, which relate to the technical field of tableware processing equipment. The residual water treatment device includes: a water collection mechanism and an opening and closing mechanism. The opening and closing mechanism is arranged on the drainage channel of the dishwasher. The opening and closing mechanism is configured to connect the water collection mechanism and the drainage pipe of the dishwasher so that the residual water in the drainage pump automatically flows into the water collection mechanism by gravity. Although the residual water treatment device and the dishwasher can prevent the wastewater in the drainage pipe and the residual water in the drainage pump from flowing back into the dishwasher and affecting the environment inside the dishwasher; however, the heat contained in the wastewater is not utilized, resulting in a large energy loss.

[0005] Prior art three, Chinese patent, patent number: 202421440105.4 includes a primary heat exchanger, a secondary heat exchanger, a cooling heat exchanger, a compressor, a throttling mechanism, an exhaust device and a heating component. The primary heat exchanger has channel one and channel two for mutual heat exchange, the secondary heat exchanger has channel three and channel four for mutual heat exchange, the cooling heat exchanger has channel five and channel six for mutual heat exchange, the system water inlet is connected to the inlet of channel one, the outlet of channel one is connected to the inlet of channel three, the outlet of channel three is connected to the inlet of the heating component, the outlet of the heating component is connected to the water inlet of the dishwasher, the drain outlet of the dishwasher is connected to the inlet of channel two, the outlet of channel two is connected to the system drain, and the steam exhaust outlet of the dishwasher is connected to the inlet of channel five. Although the waste water and waste heat of steam discharged during the operation of the dishwasher can be fully utilized to partially or completely replace the original hot water with electricity, steam or other heating methods, thereby reducing the operating energy consumption of the dishwasher and reducing operating costs; however, it is not taken into account that the discharge temperature of the dishwasher waste water can reach above 80°C. When a large amount of waste water above 80°C is discharged in a concentrated manner, it may cause thermal pollution.

[0006] At present, the existing technologies 1, 2 and 3 have the problem that the heat contained in the wastewater is not utilized, resulting in energy loss and concentrated discharge of wastewater above 80°C, which may cause thermal pollution. In order to solve the above problems, the present invention provides a public kitchen dishwasher wastewater heat recovery and utilization device, method and system. Summary of the Invention

[0007] The main purpose of the present invention is to provide a device, method and system for recovering and utilizing wastewater from dishwashers in public kitchens, so as to solve the problems in the prior art where the heat contained in the wastewater is not utilized, resulting in energy loss, and the concentrated discharge of wastewater above 80°C may cause thermal pollution.

[0008] To achieve the above object, the present invention provides the following technical solutions: A device for recovering heat from dishwasher wastewater in a public kitchen, comprising: Drainage device, used to collect high-temperature wastewater discharged from the dishwasher, perform oil-water separation and preliminary treatment, discharge purified water and temporarily store waste oil and solid impurities; A heating device is used to utilize the waste heat of the grease trap wastewater to heat the water in the pressurized hot water tank through a heat pump system to achieve heat energy recovery; A water device is used to automatically replenish water and use water pressure to supply hot water to the dishwasher.

[0009] As a further improvement of the present invention, the drainage device includes: a wastewater drainage pipe connecting the dishwasher and the grease trap to transmit high-temperature wastewater; a grease trap water inlet pipe receives wastewater from the wastewater drainage pipe and enters the grease trap; the interior of the grease trap is designed as an oil-water separation cavity, which utilizes density difference to separate oil, water and residue into layers; the grease trap water outlet pipe is located in the middle and lower layers of the grease trap to discharge the separated water to the outdoor wastewater pipe; the grease trap residue collection pit is located at the bottom of the grease trap to collect precipitated solid impurities such as food residues.

[0010] As a further improvement of the present invention, the heating device includes: a temperature sensor that monitors the wastewater temperature in the grease trap and sets a threshold value T1; a temperature sensor that monitors the water temperature in the pressurized hot water tank and sets a threshold value T2; an indirect sewage water source heat pump includes a refrigerant circulation system that absorbs / releases heat through phase change; a water inlet pipe transports the heat transfer medium to the grease trap heat exchange area; a return pipe recovers the heat transfer medium after absorbing heat to the heat pump; a water inlet pipe inputs the heat transfer medium heated by the heat pump into the pressurized hot water tank; and a water outlet pipe recovers the heat transfer medium to the heat pump to form a closed loop.

[0011] As a further improvement of the present invention, the water use device includes: a pressurized hot water tank liquid level sensor monitors the water level in the water tank and sets a threshold value H0; an electric valve on the pressurized hot water tank water supply pipe controls the tap water supply amount; the pressurized hot water tank water supply pipe connects the tap water pipeline and the pressurized hot water tank and has its own water pressure; the pressurized hot water tank stores heated water and directly supplies the dishwasher through water pressure.

[0012] As a further improvement of the present invention, the grease trap cleaning device includes a wastewater heat exchange coil located at the bottom of the grease trap, below the design water level, for absorbing the heat of the wastewater; an area between the waste oil storage area heat exchange coil and the design water level of the grease trap, for temporarily storing floating oil; a grease trap slag pit for collecting precipitated solid impurities; and cleaning tools, an oil suction pump and an oil scraper, for removing waste oil and residue.

[0013] To achieve the above object, the present invention also provides the following technical solutions: A method for recovering heat from dishwasher wastewater in a public kitchen comprises the following steps: Sensors are used to obtain data from public kitchen dishwashers, including wastewater temperature changes, cooling water initial temperature and temperature after heat exchange, and water tank water level. The grease trap water temperature, pressurized hot water tank water temperature, and pressurized hot water tank water level are adjusted based on the data. Establish a public kitchen dishwasher recycling simulation mechanism, input the adjusted public kitchen dishwasher data into the public kitchen dishwasher recycling simulation mechanism to simulate and verify whether the adjusted recycling rate is qualified; If the recovery rate is unsatisfactory, the water temperature of the grease trap, the water temperature of the pressurized hot water tank and the water level of the pressurized hot water tank will be readjusted; the adjusted public kitchen dishwasher data will be re-obtained and input into the public kitchen dishwasher recovery simulation mechanism for simulation.

[0014] As a further improvement of the present invention, the public kitchen dishwasher data is used to adjust the water temperature of the grease trap, the water temperature of the pressurized hot water tank, and the water level of the pressurized hot water tank, including the following steps: Sensors are used to capture data from public kitchen dishwashers, including wastewater temperature changes, cooling water initial and post-heat exchange temperatures, and tank water levels. Heat from the high-temperature wastewater is transferred to the water in the grease trap, and the wastewater flow rate or heat exchange time is adjusted based on wastewater temperature changes. The pre-stored cold water and the hot water after washing are exchanged through the heat exchange device. When insufficient hot water is detected, the heat exchange time is extended; the outlet water temperature is dynamically adjusted according to the water level range; if the water temperature does not reach the preset standard value, the electric heater is started for additional heating; When the water level is lower than the set value, the cold water inlet solenoid valve is opened to replenish water until the target water level is reached and then closed. When the water level reaches the maximum water level, the water replenishment valve is closed and the water pump is started to return hot water to the heat exchange pipe to increase the water temperature through secondary heat exchange. If the water level sensor fails, an alarm will be triggered immediately and water supply will be stopped.

[0015] As a further improvement of the present invention, a public kitchen dishwasher recycling simulation mechanism is established, comprising the following steps: Integrate real-time public kitchen dishwashing data, establish a public kitchen dishwasher recycling simulation mechanism, set simulation targets for the public kitchen recycling simulation mechanism, and set temperature difference and water level control range; Establish a heat transfer program based on heat transfer efficiency; simulate multi-stage heat exchange zones, monitor the temperature difference in each zone through a virtual temperature probe, and dynamically control the opening and closing of the solenoid valve. Integrate water level sensor data to simulate the filling or draining operations of the pressurized hot water tank; The adjusted public kitchen dishwasher data is input into the public kitchen dishwasher recycling simulation mechanism for simulation verification, and the results are output; if the simulation results show that the recycling rate meets the preset standard, the readjustment logic is triggered.

[0016] As a further improvement of the present invention, the input is put into the public kitchen dishwasher recycling simulation mechanism for simulation, including the following steps: If the recovery rate is unsatisfactory, the grease trap water temperature, the pressurized hot water tank water temperature, and the pressurized hot water tank water level are readjusted; based on the simulation results, the grease trap water temperature, the pressurized hot water tank water temperature and water level and other public kitchen data are readjusted; If the adjusted public kitchen data is designed for wastewater treatment, solid impurities are removed again and the data is fed back to the controller; the controller outputs the real-time public kitchen data to the public kitchen dishwasher recycling simulation mechanism for re-simulation; Iterate in sequence until the recycling rate meets the preset standard; compare the real-time public kitchen recycling rate with the simulation results. If the comparison is greater than the preset recycling threshold, adjust the public kitchen dishwasher recycling simulation mechanism.

[0017] To achieve the above object, the present invention also provides the following technical solutions: A public kitchen dishwasher wastewater heat recovery and utilization system, comprising: A data collection module, which is used to read, collect, and store data related to the operation of the dishwasher wastewater heat recovery and water heating system in the public kitchen; Control module, used to control water tank replenishment and start and stop of indirect sewage water source heat pump unit; The waste heat recovery and water heating module is used to recycle and store waste heat for hot water preparation. It extracts heat from the wastewater discharged from the dishwasher into the grease trap through heat exchange, and uses an indirect sewage water source heat pump unit to heat tap water to supply water to the dishwasher, thereby reducing the electricity consumed by heating tap water when the dishwasher is working.

[0018] To achieve the above object, the present invention also provides the following technical solutions: An electronic device includes a processor and a memory coupled to the processor, wherein the memory stores program instructions executable by the processor; when the processor executes the program instructions stored in the memory, the layout method of the public kitchen dishwasher wastewater heat recovery and utilization device as described above is implemented.

[0019] To achieve the above object, the present invention also provides the following technical solutions: A storage medium stores program instructions, which, when executed by a processor, implement a layout method for the above-mentioned public kitchen dishwasher wastewater heat recovery and utilization device.

[0020] The system's integrated functionality includes: control of the indirect sewage-source heat pump's start and stop based on the grease trap water temperature and the pressurized hot water tank's water temperature; the relative height of the wastewater heat exchange coil within the grease trap, and the placement of the grease trap's slag pit. The combination of a data collection unit and a control unit ensures that the system maximizes heat recovery from the grease trap wastewater, while maintaining a constant temperature within the grease trap and ensuring safe drainage. The system's operating condition adjustment process can be automated through control cabinet programming, automatically adapting to changes in water consumption and eliminating the need for manual operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic structural diagram of an embodiment of a device for recovering heat from dishwasher wastewater in a public kitchen according to the present invention; Figure 2This is a schematic structural diagram of a grease trap cleaning device in one embodiment of the device for recovering and utilizing wastewater heat from a dishwasher in a public kitchen according to the present invention; Figure 3 This is a flowchart of one embodiment of a method for recovering heat from dishwasher wastewater in a public kitchen according to the present invention; Figure 4 This is a flow chart of the steps for adjusting the grease trap water temperature, pressurized hot water tank water temperature, and pressurized hot water tank water level based on public kitchen dishwasher data in one embodiment of the present invention; Figure 5 A flowchart of the steps for establishing a public kitchen dishwasher recycling simulation mechanism according to one embodiment of the method for recycling wastewater heat from a public kitchen dishwasher of the present invention; Figure 6 A flowchart of the steps of inputting heat recovery and utilization method of wastewater from a dishwasher in a public kitchen into a simulation mechanism for recycling a dishwasher in a public kitchen for simulation according to an embodiment of the present invention; Figure 7 This is a functional module diagram of an embodiment of a system for recovering heat from dishwasher wastewater in a public kitchen according to the present invention; Figure 8 This is a schematic structural diagram of an embodiment of an electronic device of the present invention; Figure 9 This is a schematic structural diagram of an embodiment of a storage medium of the present invention. DETAILED DESCRIPTION

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0023] The terms "first," "second," and "third" in this disclosure are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features indicated. Therefore, features specified as "first," "second," or "third" may explicitly or implicitly include at least one of such features. In the description of this disclosure, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined. All directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this disclosure are intended only to illustrate the relative positional relationships and movement of components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly. Furthermore, the terms "including," "having," and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or elements is not limited to the listed steps or elements and may optionally include steps or elements not listed, or may optionally include other steps or elements inherent to such process, method, product, or apparatus.

[0024] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute a separate or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0025] like Figure 1 As shown, this embodiment provides an embodiment of a device for recovering and utilizing wastewater from a dishwasher in a public kitchen. In this embodiment, the device for recovering and utilizing wastewater from a dishwasher in a public kitchen comprises: Drainage device, used to collect high-temperature wastewater discharged from the dishwasher, perform oil-water separation and preliminary treatment, discharge purified water and temporarily store waste oil and solid impurities; A heating device is used to utilize the waste heat of the grease trap wastewater to heat the water in the pressurized hot water tank through a heat pump system to achieve heat energy recovery; A water device, which is used to automatically replenish water and use water pressure to supply hot water to the dishwasher to ensure a stable hot water supply; The grease trap cleaning device is used to separate and collect waste oil and solid impurities to avoid affecting the heat exchange efficiency and facilitate regular cleaning.

[0026] The dishwasher 1 transmits wastewater to the grease trap 3 through the wastewater exhaust pipe 2, wherein the grease trap 3 includes a grease trap inlet pipe 4, a grease trap outlet pipe 5 and a grease trap slag pit 6; the grease trap outlet pipe 5 discharges the water after the oil separation treatment through the outdoor wastewater pipe 7; a temperature sensor 8 is placed in the grease trap 3 and connected to the automation control cabinet 20; the pressurized hot water tank 9 is installed with two temperature sensors 10 and a pressurized hot water tank level sensor 17, and the two temperature sensors 10 and the pressurized hot water tank level sensor 17 are connected to the automation control cabinet 20; the automation control cabinet 20 controls the pressurized hot water tank water supply pipe electric valve 16 Control the pressurized hot water tank feed pipe 18 to feed tap water to the pressurized hot water tank 9; extract the heat of the wastewater from the grease trap 3, and respond to the indirect sewage water source heat pump 11 to control the circulating heating inlet pipe 14 and the circulating heating outlet pipe 15 to circulate and heat the water in the pressurized hot water tank 9; the circulating heat transfer medium inlet pipe 12 and the circulating heat transfer medium return pipe 13 absorb the heat of the wastewater in the grease trap 3; the water in the pressurized hot water tank 9 utilizes the water pressure of the pressurized hot water tank feed pipe 18; the wastewater heat exchange coil 19 is installed under the grease trap 3, and the space between the wastewater heat exchange coil 19 and the designed water level in the grease trap 3 is the space for storing waste oil.

[0027] Furthermore, the drainage device includes: a wastewater drainage pipe 2: connecting the dishwasher 1 and the grease trap 3 to transmit high-temperature wastewater; a grease trap inlet pipe 4 receives wastewater from the wastewater drainage pipe 2 and enters the grease trap; the interior of the grease trap 3 is designed as an oil-water separation cavity, which utilizes density difference to separate oil, water and residue into layers; the grease trap outlet pipe 5 is located in the middle and lower layers of the grease trap, and discharges the separated water to the outdoor wastewater pipe 7; the grease trap slag pit 6 is located at the bottom of the grease trap to collect precipitated solid impurities such as food residues.

[0028] When the dishwasher 1 is running, high-temperature waste water is discharged into the grease trap 3 through the wastewater drain pipe 2. The grease trap 3 includes a grease trap inlet pipe 4, a grease trap outlet pipe 5, and a grease trap slag pit 6. The grease trap outlet pipe 5 discharges the water after the grease trap treatment through the outdoor wastewater pipe 7. The grease trap slag pit 6 is used to collect solid impurities entering the grease trap, so as to facilitate regular cleaning of the precipitated impurities in the grease trap.

[0029] Furthermore, the heating device includes: a temperature sensor 8 that monitors the wastewater temperature in the grease trap 3 and sets a threshold value T1; a temperature sensor 10 that monitors the water temperature in the pressurized hot water tank 9 and sets a threshold value T2; an indirect sewage water source heat pump 11 includes a refrigerant such as an R134a circulation system, which absorbs / releases heat through phase change; a water inlet pipe 12 that transports the heat transfer medium to the grease trap heat exchange area; a return pipe 13: recovers the heat transfer medium after absorbing heat to the heat pump; a water inlet pipe 14 inputs the heat transfer medium heated by the heat pump into the pressurized hot water tank 9; and a water outlet pipe 15 that recovers the heat transfer medium to the heat pump to form a closed loop.

[0030] When the water temperature in the pressurized hot water tank 9 is detected by the second temperature sensor 10 to be lower than the set temperature T2, and the water temperature in the grease trap is detected by the first temperature sensor 8 to be not lower than the set temperature T1, the indirect sewage water source heat pump 11 is started, and the heat transfer medium (such as R134a, R22) passes through the circulating heat transfer medium 12 inlet pipe and the circulating heat transfer medium 13 return pipe in turn, thereby absorbing the heat of the wastewater in the grease trap 3; through the physical state change of the refrigerant in the indirect sewage water source heat pump 11, the heat of the wastewater is extracted from the grease trap 3, and the water in the pressurized hot water tank 9 is circulated and heated through the circulating heating inlet pipe 14 and the circulating heating outlet pipe 15 until the water in the hot water tank reaches the set temperature T2 as detected by the second temperature sensor 10 or the wastewater temperature in the grease trap is detected by the first temperature sensor 8 to be lower than the set temperature T1, the indirect sewage water source heat pump 11 stops operating.

[0031] Furthermore, the water-using device includes: a pressurized hot water tank liquid level sensor 17: monitoring the water level in the water tank to set a threshold value H0; a pressurized hot water tank water supply pipe electric valve 16 controls the tap water supply amount; a pressurized hot water tank water supply pipe 18 connects the tap water pipeline and the pressurized hot water tank 9, and has its own water pressure; the pressurized hot water tank 9 stores heated water and directly supplies the dishwasher 1 through water pressure.

[0032] When the water level in the pressurized hot water tank 9 is detected by the pressurized hot water tank liquid level sensor 17 and is found to be lower than the set value H0, the electric valve of the pressurized hot water tank water supply pipe 16 is opened, and tap water is used to replenish the pressurized hot water tank 9 through the pressurized hot water tank water supply pipe 18; when the dishwasher 1 is using water, the water in the pressurized hot water tank 9 is supplied to the dishwasher 1 using the water pressure generated by the pressurized hot water tank water supply pipe 18.

[0033] Furthermore, if Figure 2 As shown, the grease trap cleaning device includes: a wastewater heat exchange coil 19 located at the bottom of the grease trap 3, below the design water level, for absorbing wastewater heat; an area between the waste oil storage area heat exchange coil 19 and the design water level of the grease trap, for temporarily storing floating oil; a grease trap slag pit 6 for collecting precipitated solid impurities; cleaning tools such as an oil suction pump and an oil scraper, for removing waste oil and residue.

[0034] The wastewater heat exchange coil 19 is lower than the designed water level in the grease trap, and the space between the wastewater heat exchange coil 19 and the designed water level in the grease trap 3 is for storing waste oil; when the stored waste oil reaches the height of the wastewater heat exchange coil 19, the waste oil needs to be removed by an oil suction pump, an oil scraper, etc. to avoid affecting the heat exchange efficiency of the wastewater heat exchange coil 19; at the same time, the setting of the wastewater heat exchange coil 19 avoids the grease trap slag pit 16, thereby facilitating the cleaning of the grease trap slag pit 6; the grease trap cleaning cycle should be determined according to the usage of the grease trap and the accumulation rate of grease.

[0035] like Figure 3As shown, this embodiment also provides an embodiment of a method for recovering heat from dishwasher wastewater in a public kitchen. In this embodiment, the method for recovering heat from dishwasher wastewater in a public kitchen is applied to the device for recovering heat from dishwasher wastewater in the above embodiment. The method for recovering heat from dishwasher wastewater in a public kitchen specifically includes the following steps: Step S1: Obtaining data about the public kitchen dishwasher, such as wastewater temperature changes, initial and post-heat exchange cooling water temperatures, and water tank levels, through sensors; and adjusting the grease trap water temperature, pressurized hot water tank water temperature, and pressurized hot water tank water level based on the public kitchen dishwasher data. Step S2: establishing a public kitchen dishwasher recycling simulation mechanism, inputting the adjusted public kitchen dishwasher data into the public kitchen dishwasher recycling simulation mechanism to perform simulation verification to determine whether the adjusted recycling rate is qualified; Step S3: If the recovery rate is unqualified, the water temperature of the grease trap, the water temperature of the pressurized hot water tank, and the water level of the pressurized hot water tank are readjusted; the adjusted public kitchen dishwasher data is re-acquired and input into the public kitchen dishwasher recovery simulation mechanism for simulation.

[0036] Preferably, in this embodiment, sensors are used to obtain data such as wastewater temperature changes, initial / post-heat exchange temperature of cooling water, and water level in the water tank; the water temperature of the grease trap, and the water temperature and level of the pressurized hot water tank are adjusted in real time according to the sensor data; a dishwasher recovery simulation mechanism is established, and the adjusted data is input for simulation verification; if the simulation results show that the recovery rate is unqualified, the parameters are readjusted and the simulation is repeated; through multi-stage temperature monitoring and segmented heat exchange (such as solenoid valves controlling the wastewater flow path), the ineffective heat exchange time is reduced and the waste heat recovery efficiency is significantly improved; the waste heat of the wastewater is recovered for preheating cold water, reducing the energy consumption of electric heating; the sensor data is linked with the controller to achieve precise adjustment to avoid errors caused by manual intervention.

[0037] Furthermore, if Figure 4 As shown, the process of adjusting the water temperature of the grease trap, the water temperature of the pressurized hot water tank, and the water level of the pressurized hot water tank according to the public kitchen dishwasher data in step S1 specifically includes the following steps: Step S11: Using sensors to obtain data about the public kitchen dishwasher, such as wastewater temperature changes, initial and post-heat exchange temperatures of the cooling water, and the water level in the water tank; transferring heat from the high-temperature wastewater to the water in the grease trap, and adjusting the wastewater flow rate or heat exchange time based on the wastewater temperature changes; Step S12: The pre-stored cold water and the hot water after washing are heat exchanged through the heat exchange device. When insufficient hot water is detected, the heat exchange time is extended; the outlet water temperature is dynamically adjusted according to the water level range; if the water temperature does not reach the preset standard value, the electric heater is activated for additional heating; Step S13: When the water level is lower than the set value, the cold water inlet solenoid valve is opened to replenish water until the target water level is reached and then closed. When the water level reaches the maximum water level, the water replenishment valve is closed and the water pump is started to return hot water to the heat exchange pipe to increase the water temperature through secondary heat exchange; if the water level sensor fails, an alarm is immediately triggered and water intake is stopped.

[0038] Preferably, in this embodiment, the temperature of wastewater, cooling water and water tank is monitored in real time through a temperature sensor, and the water level data of the water tank is dynamically obtained in combination with a water level sensor; precise control of water temperature and water level is achieved to avoid ineffective heat exchange (such as closing the solenoid valve when the temperature reaches the standard) and energy waste, while preventing overflow or idling caused by abnormal water level; the wastewater flow rate or heat exchange time is automatically adjusted according to the change in wastewater temperature, and the heat exchange time is extended when hot water is insufficient; the heat recovery efficiency is optimized, for example, by extending the waste heat contact time through a spiral tube heat exchanger to fully absorb heat energy; the outlet water temperature is dynamically adjusted according to the water level range; the solenoid valve is opened to replenish water when the water level is low, and the replenishment valve is closed and the water pump is started to return hot water to the heat exchange tube when the water level is high; equipment damage or safety accidents caused by sensor failure are avoided; when the water level sensor fails, an alarm is triggered and water intake is stopped.

[0039] Furthermore, if Figure 5 As shown, the process of establishing a public kitchen dishwasher recycling simulation mechanism in step S2 specifically includes the following steps: Step S21: Integrate real-time public kitchen dishwashing data, establish a public kitchen dishwasher recycling simulation mechanism, set a simulation target for the public kitchen recycling simulation mechanism, and set a temperature difference and a water level control range; The process of establishing a simulation mechanism for recycling dishwashers in public kitchens includes the following steps: Based on the acquired data on wastewater temperature fluctuations, hot and cold water temperature gradients, and water storage unit volumes, a dynamic data aggregation module performs real-time information integration to form a heat exchange threshold definition layer. This layer includes two core parameters: the temperature gradient tolerance range and the water storage capacity safety margin. The temperature gradient tolerance range is derived from the thermodynamic equilibrium analysis of the dishwasher's drainage and water purification ends, while the water storage capacity safety margin is calculated based on the equipment's physical structural parameters. The heat exchange threshold definition layer drives the formation of a multi-level heat conduction efficiency model. Virtual partitioning technology divides the heat exchange field into three interrelated action zones: the initial temperature difference balance zone, the gradient optimization maintenance zone, and the critical buffer protection zone. Each action zone is equipped with a virtual thermal field detector, whose monitoring accuracy is determined by the temperature gradient tolerance range and is also associated with the working mode of the flow control component. A multi-level heat conduction efficiency model and water storage capacity safety boundary parameters jointly generate a coordinated liquid level control system. This system includes two subsystems: a dynamic compensation mechanism and an overload protection mechanism. The dynamic compensation mechanism adjusts the fluid exchange rate based on the real-time thermal field distribution, while the overload protection mechanism triggers pressure balancing operations through virtual volume monitoring nodes. These two subsystems form a closed-loop control system through feedback channels. The simulated data output by the liquid level coordinated control system enters the efficiency verification phase, generating a heat recovery efficiency index. This index determines whether the system has entered an optimization iteration cycle by comparing the actual heat exchange efficiency with the preset heat exchange threshold. If the index exceeds the tolerance range, the data remapping process is triggered, and the abnormal parameters are re-imported into the dynamic data collection module for parameter reorganization. The process of dividing the heat exchange field into three interrelated action zones using virtual partitioning technology includes the following steps: Based on the temperature gradient tolerance interval in the heat exchange threshold definition layer, an initial thermodynamic characteristic map is generated using a thermal field topology analysis algorithm. This map transforms the energy distribution state of the heat exchange field into a three-dimensional vector space model, where the vector length represents the temperature change rate and the vector direction reflects the heat flow diffusion trend. The thermodynamic properties of each coordinate point in the map are derived from the heat flow trajectory tracking data at the dishwasher drain and water purification ends. The initial thermodynamic characteristic map drives the field boundary reconstructor to generate the energy gradient boundary. The reconstruction process adheres to two constraints: 1) the temperature gradient tolerance interval determines the energy transition threshold of adjacent regions; 2) the water storage capacity safety boundary limits the maximum expansion range of the field. A dynamic envelope algorithm is used to delineate three energy transition characteristic zones in vector space: the initial energy transition zone, the gradient stable transition zone, and the critical buffer isolation zone. Their spatial geometry forms an orthogonal mapping relationship with the heat flow trajectory. The energy gradient boundary is transformed into three action zone entities through functional coupling rules: Initial temperature difference balance zone: corresponds to the initial energy transition zone, and the starting point of temperature difference compensation is locked by heat flow trajectory interception technology. Its scope of action is limited by the maximum heat flux density value at the drainage end; Gradient optimization maintenance zone: corresponds to the gradient stable transition zone, and uses energy gradient matching technology to establish a continuous heat exchange channel. The channel width is determined by the minimum value of the temperature gradient tolerance interval; Critical buffer protection zone: corresponds to the critical buffer isolation zone, and an annular buffer layer is generated through the thermal inertia damping algorithm. Its thickness is nonlinearly positively correlated with the safety boundary of the water storage capacity; Step S22: Establish a heat transfer program based on the heat transfer efficiency; simulate multi-stage heat exchange zones, monitor the temperature difference in each zone through a virtual temperature probe, and dynamically control the opening and closing of the solenoid valve. Integrate water level sensor data to simulate the water filling or draining operation of the pressurized hot water tank; Step S23: input the adjusted public kitchen dishwasher data into the public kitchen dishwasher recycling simulation mechanism for simulation verification, and output the results; if the simulation results show that the recycling rate meets the preset standard, the re-adjustment logic is triggered.

[0040] Preferably, this embodiment integrates real-time public kitchen dishwashing data to establish a recycling simulation mechanism, and sets simulation targets, temperature differentials, and water level control ranges. This real-time data integration allows for more accurate simulation of actual dishwasher operation, providing a reliable basis for subsequent optimization. Furthermore, the set temperature differentials and water level control ranges facilitate efficient energy conservation and precise control. A heat transfer program is established based on heat transfer efficiency to simulate a multi-stage heat exchange process. Temperature differentials are monitored using virtual temperature probes, and solenoid valve openings and closings are dynamically controlled. Water level sensor data is integrated to simulate the filling and draining of a pressurized hot water tank. This multi-stage heat exchange simulation significantly improves heat utilization efficiency and reduces energy waste. Dynamically controlling the opening and closing of solenoid valves and real-time monitoring of temperature differentials adjusts water flow and heat distribution based on actual needs, thereby reducing energy consumption. Combined with water level sensor data, precise filling and draining of the pressurized hot water tank is achieved, avoiding energy waste or equipment damage caused by abnormal water levels. The adjusted data is input into the recycling simulation mechanism for verification, and the results are output. If the recovery rate does not meet the preset standard, the logic is re-adjusted. Through simulation verification, the recycling effect after adjustment can be quickly tested to ensure that the recovery rate reaches the expected target; if the recovery rate does not meet the standard, the logic will be readjusted to ensure continuous optimization of the system, ultimately achieving higher resource utilization efficiency and lower energy consumption.

[0041] Furthermore, if Figure 6 As shown, the process of inputting the data into the public kitchen dishwasher recycling simulation mechanism for simulation in step S3 specifically includes the following steps: Step S31: If the recovery rate is unsatisfactory, the grease trap water temperature, the pressurized hot water tank water temperature, and the pressurized hot water tank water level are readjusted; public kitchen data such as the grease trap water temperature, the pressurized hot water tank water temperature and water level are readjusted based on the simulation results; Step S32: If the adjusted public kitchen data is designed for wastewater treatment, solid impurities are removed again and the data is fed back to the controller; the controller outputs the real-time public kitchen data to the public kitchen dishwasher recycling simulation mechanism for re-simulation; Step S33: Iterate in sequence until the recycling rate meets the preset standard; compare the real-time public kitchen recycling rate with the simulation result, and if the comparison is greater than the preset recycling threshold, adjust the public kitchen dishwasher recycling simulation mechanism.

[0042] Preferably, this embodiment uses sensors to monitor the water temperature and level in the grease trap and pressurized hot water tank in real time, dynamically adjusting them based on simulation results. After wastewater undergoes multi-stage filtration (such as coarse screening, fine screening, and sedimentation) to remove solid impurities, a heat recovery device transfers heat from the wastewater to a new water stream, thereby achieving wastewater recycling. A waste heat recovery tank or heat exchanger exchanges heat between the high-temperature water generated during the dishwasher rinse phase and cold water, raising the initial water temperature and reducing heating energy consumption. A controller outputs real-time public kitchen data to the dishwasher recovery simulation mechanism, comparing actual recovery rates with simulation results to continuously adjust parameters to optimize recovery efficiency. Heat recovery technology and wastewater recycling reduce energy consumption and water waste, while also minimizing the environmental impact of direct wastewater discharge. Intelligent water temperature and level adjustment, combined with wastewater treatment processes, ensures that wastewater meets discharge standards while increasing recovery rates and meeting preset standards. Automated monitoring and adjustment using sensors and controllers reduces manual intervention, improving operational efficiency and equipment stability. This reduces operating costs by conserving energy and water resources, while also reducing sewage treatment fees.

[0043] Furthermore, the process of re-adjusting the public kitchen data such as the grease trap water temperature, the pressurized hot water tank water temperature and the water level according to the simulation results in step S31 specifically includes the following steps: Step S311: Based on the calculation that the temperature of the wastewater discharged from the dishwasher into the grease trap is 70°C and the temperature of the wastewater discharged after heat exchange is 20°C, theoretically the heat that can be recovered by the sewage source heat pump unit per day is for:

[0044] Electricity consumed by sewage source heat pump unit operation , Recover wastewater heat from grease traps , energy for preparing hot water for dishwashers , sewage source heat pump unit The value satisfies the following formula:

[0045]

[0046] Combining the above two equations, we can get:

[0047] Step S312: The total power consumed under the same working conditions is +N power = 89kW;

[0048] Energy saving rate can reach , with significant energy-saving effects. At the same time, since the dishwasher's drainage and water usage times overlap well, a high waste heat recovery rate can be guaranteed during actual operation.

[0049] like Figure 7 As shown, this embodiment also provides an embodiment of a public kitchen dishwasher wastewater heat recovery and utilization system. In this embodiment, the public kitchen dishwasher wastewater heat recovery and utilization system is applied to the public kitchen dishwasher wastewater heat recovery and utilization device as described in the above embodiment. The public kitchen dishwasher wastewater heat recovery system includes: A data collection module, which is used to read, collect, and store data related to the operation of the dishwasher wastewater heat recovery and water heating system in the public kitchen; Control module, used to control water tank replenishment and start and stop of indirect sewage water source heat pump unit; The waste heat recovery and water heating module is used to recycle waste heat and store it for hot water production. This module extracts heat from the dishwasher's wastewater discharged into the grease trap through heat exchange. Using an indirect wastewater-source heat pump unit, it heats tap water for the dishwasher, reducing the energy consumed by heating the tap water during dishwasher operation.

[0050] Furthermore, the data collection module in this embodiment includes a grease trap water temperature monitoring module, a pressurized hot water tank water temperature monitoring module, and a pressurized hot water tank water level monitoring module. The control module includes a control unit for the inlet valve on / off of the pressurized hot water tank feed pipe and a control unit for starting and stopping the indirect sewage-source heat pump. The waste heat recovery and water heating module includes the grease trap, the indirect sewage-source heat pump, the circulating heat transfer medium inlet and return pipes, the wastewater heat exchange coil, and the pressurized hot water tank. By monitoring the temperature of the wastewater in real time, the waste heat content of the wastewater can be determined, and then it can be decided whether it is necessary to start the heat pump unit or adjust the heat exchange efficiency; when the water level in the water tank is detected to be lower than the set value, the control module will start the water replenishment device; and when the waste heat of the wastewater is not enough to meet the heating demand, the heat pump unit will start to improve the hot water supply efficiency; through spiral tube heat exchangers or plate heat exchangers, the thermal utilization rate of wastewater can be effectively improved and the energy loss during the heating process can be reduced; by recycling the waste heat in the dishwasher wastewater, the dependence on electric heating is reduced, thereby reducing energy consumption; reducing the use of fossil energy, reducing carbon emissions and pollutant emissions, in line with the requirements of green development; by optimizing the design and control strategy of the heat exchanger, the thermal efficiency of the system is improved; due to the reduction in the use of electric heating, the operating cost is reduced, and the utilization efficiency of water resources is improved.

[0051] like Figure 8 As shown, this embodiment provides an embodiment of an electronic device. In this embodiment, the electronic device 22 includes a processor 221 and a memory 222 coupled to the processor 221.

[0052] The memory 222 stores program instructions for implementing the layout method of the public kitchen dishwashing wastewater heat recovery and utilization device of any of the above embodiments.

[0053] The processor 221 is used to execute the program instructions stored in the memory 222 to arrange the heat recovery and utilization device for dishwashing wastewater in a public kitchen.

[0054] The processor 221 may also be referred to as a CPU (Central Processing Unit). The processor 221 may be an integrated circuit chip with signal processing capabilities. The processor 221 may also be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component. The general-purpose processor may be a microprocessor or any conventional processor.

[0055] Further, Figure 9 This is a schematic diagram of the structure of a storage medium in an embodiment of the present application. The storage medium 23 in the embodiment of the present application stores program instructions 231 that can implement all of the above methods. The program instructions 231 can be stored in the above storage medium in the form of a software product, including several instructions for causing a computer device (which can be a personal computer, server, or network device, etc.) or a processor to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program code, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, or terminal devices such as a computer, server, mobile phone, and tablet.

[0056] In the several embodiments provided by the present invention, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interface, device or unit, which can be electrical, mechanical or other forms.

[0057] In addition, the functional units in the various embodiments of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated units may be implemented in the form of hardware or in the form of software functional units. The above is only an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

[0058] The above detailed description of the specific embodiments of the invention is intended to be illustrative only, and the present invention is not limited to the specific embodiments described above. For those skilled in the art, any equivalent modifications or substitutions to the invention are also within the scope of the present invention. Therefore, equivalent changes, modifications, and improvements made without departing from the spirit and scope of the present invention are also encompassed within the scope of the present invention.

Claims

1. A device for recovering heat from dishwasher wastewater in a public kitchen, characterized in that: The public kitchen dishwasher wastewater recycling device includes: Drainage device, used to collect high-temperature wastewater discharged from the dishwasher, perform oil-water separation and preliminary treatment, discharge purified water and temporarily store waste oil and solid impurities; A heating device is used to utilize the waste heat of the grease trap wastewater to heat the water in the pressurized hot water tank through a heat pump system to achieve heat energy recovery; A water device is used to automatically replenish water and use water pressure to supply hot water to the dishwasher.

2. The device for recovering wastewater heat from dishwasher in a public kitchen as claimed in claim 1, characterized in that: The drainage device includes: a wastewater drain pipe connecting the dishwasher and the grease trap to transmit high-temperature wastewater; a grease trap inlet pipe receives wastewater from the wastewater drain pipe and enters the grease trap; the interior of the grease trap is designed as an oil-water separation chamber, which uses density difference to separate oil, water and residue into layers; the grease trap outlet pipe is located in the middle and lower layers of the grease trap, and discharges the separated water to the outdoor wastewater pipe; the grease trap slag pit is located at the bottom of the grease trap to collect precipitated solid impurities such as food residues.

3. The device for recovering wastewater heat from dishwasher in a public kitchen as claimed in claim 1, characterized in that: The heating device includes: a temperature sensor that monitors the wastewater temperature in the grease trap and sets a threshold value T1; a temperature sensor that monitors the water temperature in the pressurized hot water tank and sets a threshold value T2; an indirect sewage water source heat pump includes a refrigerant circulation system that absorbs / releases heat through phase change; a water inlet pipe transports the heat transfer medium to the grease trap heat exchange area; a return pipe recovers the heat transfer medium after absorbing heat to the heat pump; a water inlet pipe inputs the heat transfer medium heated by the heat pump into the pressurized hot water tank; and a water outlet pipe recovers the heat transfer medium to the heat pump to form a closed loop.

4. The device for recovering heat from dishwasher wastewater in a public kitchen as claimed in claim 1, characterized in that: The water-using device includes: a pressurized hot water tank liquid level sensor that monitors the water level in the water tank and sets a threshold value H0; an electric valve on the pressurized hot water tank water supply pipe controls the amount of tap water supply; the pressurized hot water tank water supply pipe connects the tap water pipeline and the pressurized hot water tank and has its own water pressure; the pressurized hot water tank stores heated water and directly supplies it to the dishwasher through water pressure.

5. The device for recovering heat from dishwasher wastewater in a public kitchen as claimed in claim 1, characterized in that: The grease trap cleaning device includes a wastewater heat exchange coil located at the bottom of the grease trap, below the design water level, for absorbing the heat of the wastewater; the area between the waste oil storage area heat exchange coil and the design water level of the grease trap, for temporarily storing floating oil; the grease trap slag pit collects precipitated solid impurities; and cleaning tools, an oil suction pump and an oil scraper, for removing waste oil and residue.

6. A method for recovering heat from dishwasher wastewater in a public kitchen, which is applied to the device for recovering heat from dishwasher wastewater in a public kitchen as claimed in any one of claims 1 to 5, characterized in that: The method for recovering heat from wastewater from dishwashing in public kitchens comprises the following steps: Sensors are used to obtain data on wastewater temperature changes, cooling water initial temperature and temperature after heat exchange, as well as water tank water level and public kitchen dishwasher data. The grease trap water temperature, pressurized hot water tank water temperature, and pressurized hot water tank water level are adjusted based on the public kitchen dishwasher data. Establish a public kitchen dishwasher recycling simulation mechanism, input the adjusted public kitchen dishwasher data into the public kitchen dishwasher recycling simulation mechanism to simulate and verify whether the adjusted recycling rate is qualified; If the recovery rate is unsatisfactory, the water temperature of the grease trap, the water temperature of the pressurized hot water tank and the water level of the pressurized hot water tank will be readjusted; the adjusted public kitchen dishwasher data will be re-obtained and input into the public kitchen dishwasher recovery simulation mechanism for simulation.

7. The method for recovering heat from dishwasher wastewater in a public kitchen as claimed in claim 6, characterized in that: The data from the dishwasher in the public kitchen is used to adjust the water temperature of the grease trap, the water temperature of the pressurized hot water tank, and the water level of the pressurized hot water tank, including the following steps: Sensors are used to capture wastewater temperature changes, cooling water initial and post-heat exchange temperatures, and water tank water level data from public kitchen dishwashers. Heat from the high-temperature wastewater is transferred to the water in the grease trap, and the wastewater flow rate or heat exchange time is adjusted based on wastewater temperature changes. The pre-stored cold water and the hot water after washing are exchanged through the heat exchange device. When insufficient hot water is detected, the heat exchange time is extended; the outlet water temperature is dynamically adjusted according to the water level range; if the water temperature does not reach the preset standard value, the electric heater is started for additional heating; When the water level is lower than the set value, the cold water inlet solenoid valve is opened to replenish water until the target water level is reached and then closed. When the water level reaches the maximum water level, the water replenishment valve is closed and the water pump is started to return hot water to the heat exchange pipe to increase the water temperature through secondary heat exchange. If the water level sensor fails, an alarm will be triggered immediately and water supply will be stopped.

8. The method for recovering heat from dishwasher wastewater in a public kitchen as claimed in claim 6, characterized in that: Establishing a simulation mechanism for dishwasher recycling in public kitchens involves the following steps: Integrate real-time public kitchen dishwashing data, establish a public kitchen dishwasher recycling simulation mechanism, set simulation targets for the public kitchen recycling simulation mechanism, and set temperature difference and water level control range; Establish a heat transfer program based on heat transfer efficiency; simulate multi-stage heat exchange zones, monitor the temperature difference in each zone through a virtual temperature probe, and dynamically control the opening and closing of the solenoid valve. Integrate water level sensor data to simulate the filling or draining operations of the pressurized hot water tank; The adjusted public kitchen dishwasher data is input into the public kitchen dishwasher recycling simulation mechanism for simulation verification, and the results are output; if the simulation results show that the recycling rate meets the preset standard, the readjustment logic is triggered.

9. The method for recovering heat from dishwasher wastewater in a public kitchen as claimed in claim 6, characterized in that: Input into the public kitchen dishwasher recycling simulation mechanism for simulation, including the following steps: If the recovery rate is unsatisfactory, the water temperature of the grease trap, the water temperature of the pressurized hot water tank and the water level of the pressurized hot water tank are readjusted; the water temperature of the grease trap, the water temperature of the pressurized hot water tank and the water level of the public kitchen data are readjusted according to the simulation results; If the adjusted public kitchen data is designed for wastewater treatment, solid impurities are removed again and the data is fed back to the controller; the controller outputs the real-time public kitchen data to the public kitchen dishwasher recycling simulation mechanism for re-simulation; Iterate in sequence until the recycling rate meets the preset standard; compare the real-time public kitchen recycling rate with the simulation results. If the comparison is greater than the preset recycling threshold, adjust the public kitchen dishwasher recycling simulation mechanism.

10. A system for recovering and utilizing heat from dishwasher wastewater in a public kitchen, which is applied to the device for recovering and utilizing heat from dishwasher wastewater in a public kitchen as claimed in any one of claims 1 to 5, characterized in that: The public kitchen dishwashing wastewater heat recovery and utilization system comprises: A data collection module, which is used to read, collect, and store data related to the operation of the dishwasher wastewater heat recovery and water heating system in the public kitchen; Control module, used to control water tank replenishment and start and stop of indirect sewage water source heat pump unit; The waste heat recovery and water heating module is used to recycle and store waste heat for hot water preparation. It extracts heat from the wastewater discharged from the dishwasher into the grease trap through heat exchange, and uses an indirect sewage water source heat pump unit to heat tap water to supply water to the dishwasher, thereby reducing the electricity consumed by heating tap water when the dishwasher is working.

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