A surplus-heat and surplus-heat recovery air conditioner and a control method thereof

Abstract

The present application relates to air conditioning equipment technical field, provide a kind of excess heat recovery air conditioner and its control method. To solve the problem of existing air conditioner waste, lack of integrated recovery mechanism when refrigeration and heating, the end repeated energy consumption of direct exhaust waste heat and excess heat. The air conditioner includes air conditioner host, internally provided compressor, four-way reversing valve and first, second heat exchange device;Excess heat recovery module contains secondary refrigerant circulation pipeline, circulating power component, flow direction switch valve, refrigerator cooling coil and bypass auxiliary heating device, first heat exchange device is evaporator under heating condition, pipeline is connected to cold branch or bypass branch with auxiliary heating device through switch valve;Excess heat recovery module contains external water tank, auxiliary heating water tank and connecting pipeline, first heat exchange device is condenser under refrigeration condition, its medium inlet and outlet connect external water tank, external water tank is connected to auxiliary heating water tank through pipeline with one-way valve;Central control module is electrically connected to each component and controls according to mode and temperature signal.

Description

Technical Field

[0001] This invention relates to the fields of air conditioning technology and waste heat recovery technology, and more specifically, to a control method for an air conditioner that recovers waste cooling and waste heat. Background Technology

[0002] With the rapid development of the social economy and the continuous improvement of people's living standards, air conditioners and refrigerators have become indispensable basic appliances in modern homes and commercial spaces. However, these devices consume a huge amount of electricity during operation, and their proportion in the total energy consumption of buildings and homes is rising daily. Against the backdrop of global energy shortages and green, low-carbon development, improving the comprehensive energy utilization efficiency of HVAC and refrigeration systems and realizing the cascade utilization of waste energy generated during operation have become core trends and inevitable requirements for the industry's technological development.

[0003] Currently, traditional air conditioning systems release a large amount of waste heat to the outdoor environment from the condenser side during summer cooling operation. This heat is essentially the sum of heat absorbed indoors and heat converted from the compressor's work, resulting not only in ineffective utilization and significant energy waste but also exacerbating the urban heat island effect. Although existing technologies exist for recovering condensing waste heat to produce domestic hot water, they generally suffer from problems such as large fluctuations in hot water output temperature, simple control logic, slow system response, and low integration with the main unit. When the air conditioner is operating at low load or frequently starts and stops, the condensing heat discharge is insufficient, making it difficult to provide stable, constant-temperature, high-quality hot water; and to maintain the water temperature, a high-power auxiliary heating device often needs to be activated, leading to a significant reduction in overall energy efficiency. Furthermore, external recovery modules are structurally dispersed and complex to install, easily interfering with the operational stability of the original air conditioning system, limiting both user experience and engineering practicality.

[0004] On the other hand, during winter heating operation, the evaporator of a heat pump air conditioner, acting as the heat absorber, releases a massive amount of cold energy (i.e., "residual cold" or "waste cold") to the outside. In existing technologies, this cold energy, as a byproduct of the heating process, is typically directly emitted into the atmosphere without any form of recovery or utilization. Meanwhile, to maintain a low-temperature storage environment, household refrigerators require an independent, complete vapor compression refrigeration system, continuously consuming a large amount of electricity. The frequent start-stop and long-term operation of their compressors have become one of the main sources of household electricity consumption. Existing air conditioner waste energy recovery technologies mostly focus on "heat recovery," but there are few mature and efficient household-level recovery solutions for the "residual cold" generated during heating. Coupling the residual cold generated by air conditioning heating with the refrigeration needs of the refrigerator to achieve cross-device synergy and tiered utilization of energy is a gap that urgently needs to be addressed in the current technological field. Existing technologies fail to provide an effective integrated architecture that can assist or replace the refrigerator compressor while ensuring indoor heating, resulting in the wasted energy of the air conditioner's associated cold energy, while the refrigerator repeatedly consumes electricity, leading to low overall system energy efficiency.

[0005] In summary, existing air conditioning waste energy recovery devices are often functionally limited and structurally fragmented, lacking the comprehensive and coordinated recovery capability of waste heat and cold generated during both cooling and heating modes. These systems generally suffer from unstable output, inaccurate temperature control, and poor load matching with end-user devices (such as domestic water tanks and refrigerators), making it difficult to achieve true "multi-purpose use" and comprehensive energy optimization. Therefore, there is an urgent need to develop a highly integrated, intelligent, and coordinated waste heat / cold recovery air conditioning system. This system should be able to efficiently recover condensed waste heat and provide constant-temperature hot water in cooling mode, and accurately recover evaporative waste cold in heating mode for use in auxiliary cooling equipment. Simultaneously, through optimized heat exchange structures, dual-loop / dual-storage designs, and precise mode switching and temperature control logic, it should overcome the shortcomings of existing technologies, achieving dual-utility output under a single energy input, significantly improving the system's overall energy efficiency ratio (COP), reducing equipment operating noise and mechanical wear, and possessing significant economic value, environmental significance, and broad market application prospects. Summary of the Invention

[0006] This invention addresses the technical problems of existing air conditioning systems, which suffer from the direct waste emission of waste heat and residual cold during cooling and heating operations, lack of efficient integration and intelligent collaborative recovery mechanisms, resulting in low overall energy utilization efficiency and repeated energy consumption by end-user equipment.

[0007] To achieve the above objectives, the present invention employs the following technical means:

[0008] This invention provides a waste cooling and waste heat recovery air conditioner, comprising:

[0009] The air conditioning unit is equipped with a compressor, a four-way reversing valve, a first heat exchange device and a second heat exchange device; the first heat exchange device includes a flow channel for the secondary heat transfer medium and is provided with a medium inlet and outlet.

[0010] The waste heat recovery module includes a secondary refrigerant circulation pipeline, circulation power components, flow direction switching valve, refrigerator cooling coil and bypass auxiliary heating device;

[0011] When the air conditioning unit is operating in heating cycle, the first heat exchange device operates in evaporator mode, and the second heat exchange device operates in condenser mode, including:

[0012] The secondary refrigerant circulation pipeline is connected to the medium inlet and outlet of the first heat exchange device. The pipeline is equipped with the circulation power component and the flow direction switching valve. The flow direction switching valve switches the pipeline to a cooling branch connected to the refrigerator cooling coil, or a bypass branch that avoids the refrigerator cooling coil. The bypass auxiliary heating device is located on the bypass branch.

[0013] Waste heat recovery module, external water tank, auxiliary hot water tank and connecting components;

[0014] When the air conditioning unit is running in the refrigeration cycle, the first heat exchange device operates in condenser mode, and the second heat exchange device operates in evaporator mode.

[0015] The medium inlet and outlet of the first heat exchange device are connected to the external water tank through a circulation pipeline; the external water tank is connected to the auxiliary hot water tank through a connecting pipeline, and a one-way valve is provided on the pipeline; the auxiliary hot water tank is equipped with an auxiliary heating temperature control device and a temperature control system.

[0016] The central control module is electrically connected to the four-way reversing valve, the circulating power component, the flow direction switching valve, the bypass auxiliary heating device, and the auxiliary heating temperature control device, respectively, and is used to coordinate the control of each component according to the air conditioning operation mode and the load end temperature signal.

[0017] In the above scheme, the first heat exchange device includes a sealed box, which is provided with an inlet and an outlet, forming a water channel inside; the refrigerant heat exchange tube is arranged in the water channel, and the refrigerant inlet and outlet of the refrigerant heat exchange tube are led out of the sealed box for connection to the refrigerant circulation loop of the air conditioning unit.

[0018] In the above scheme, a partition is installed inside the sealed box, and the partition forms an "S"-shaped water channel inside the sealed box. The refrigerant heat exchange tube is set as an "S"-shaped structure that matches the "S"-shaped water channel.

[0019] In the above scheme, a baffle is installed on the baffle, and the angle between the baffle and the baffle along the water flow direction is 45°.

[0020] In the above scheme, the refrigerant heat exchange tubes are set into two groups, and the inlet and outlet of the two groups of refrigerant heat exchange tubes are led out through a manifold.

[0021] In the above scheme, the material of the refrigerant heat exchange tube is stainless steel or copper.

[0022] In the above scheme, the flow switching valve is a three-way solenoid valve, whose common end is connected to the medium outlet of the first heat exchange device via the circulating power component, the first switching end is connected to the cooling branch, and the second switching end is connected to the bypass branch; the end of the cooling branch and the end of the bypass branch merge and are connected to the medium inlet of the first heat exchange device.

[0023] In the above scheme, the bypass auxiliary heating device is an online electric heater; the refrigerator cooling coil is made of high thermal conductivity metal pipe, which is laid in the inner wall of the refrigerator or in the insulation layer, and is detachably connected to the cooling branch.

[0024] In the above scheme, the volume of the auxiliary hot water tank is smaller than the volume of the external water tank; the temperature control system includes a water temperature sensor and a PID controller, and the PID controller is used to dynamically adjust the heating power of the auxiliary heating temperature control device according to the real-time water temperature of the auxiliary hot water tank.

[0025] In the above scheme, the auxiliary heating temperature control device is one or a combination of an electric heating tube, a PTC heating element, or a thin film heater.

[0026] The present invention also provides a control method for a waste cooling and waste heat recovery air conditioner, characterized by comprising the following steps:

[0027] Step 1: Obtain the operating mode signal of the air conditioning unit and the real-time temperature signal of each load.

[0028] Step 2: Switch the refrigerant circulation path of the air conditioning unit according to the operating mode signal, and activate the corresponding residual energy recovery module;

[0029] Step 3: If the operating mode signal is refrigeration cycle, then control the operation of the waste heat recovery module: drive the circulation power component to make the secondary heat transfer medium circulate and exchange heat between the first heat exchange device and the external water tank, and dynamically adjust the heating power of the auxiliary heat temperature control device through the temperature control system based on the real-time temperature signal of the auxiliary hot water tank.

[0030] Step 4: If the operating mode signal is heating cycle, control the operation of the residual cold recovery module: based on the real-time temperature signal at the refrigerator load end, control the flow direction switching valve to switch the secondary heat transfer medium to the cooling branch or bypass branch, and control the start and stop of the circulation power component and the bypass auxiliary heating device in conjunction.

[0031] Because the present invention employs the above-mentioned technical means, it has the following beneficial effects:

[0032] 1. Dual-mode waste energy recovery achieves high efficiency, energy saving, and cascaded energy utilization.

[0033] This invention breaks through the limitations of traditional air conditioners' single heat recovery. In cooling mode, it efficiently recovers waste heat emitted by the condenser for domestic hot water production; in heating mode, it precisely recovers residual cold generated by the evaporator for cooling the refrigerator compartment, thus reducing the refrigerator compressor's energy consumption. The system uses a single compressor to drive electricity to simultaneously achieve indoor temperature control, constant-temperature hot water supply, and refrigeration of the refrigerator equipment, realizing cross-equipment cascade utilization of energy and "one energy source for multiple uses," significantly reducing overall electricity costs and carbon emissions.

[0034] 2. The dual water storage and bypass design ensures stable output and no performance degradation of the main unit.

[0035] Addressing the industry pain point of unstable output caused by fluctuations in the main unit load of waste heat recovery systems, this invention adopts an architecture of "external large water tank for preheating and auxiliary small water tank for fine adjustment" on the hot water end, combined with existing mature PID temperature control algorithms to achieve constant temperature and high-quality water supply within ±1℃; on the residual cold end, a three-way flow switching valve and a bypass branch are set up. When the refrigerator temperature reaches the standard or cooling is not required, the system automatically switches to bypass circulation, and the auxiliary heating device compensates for the heat load in real time to simulate the refrigerator's heat absorption conditions, ensuring that the evaporator continuously and stably absorbs heat, and completely solving the defect of waste cold recovery fluctuations interfering with the heating performance of the air conditioner main unit.

[0036] 3. Enhanced heat exchange structure and modular integration result in a compact system with strong engineering adaptability.

[0037] The heat exchange structure incorporates an "S"-shaped flow channel constructed with baffles and features baffles at a 45° angle to the water flow direction. This effectively disrupts the fluid boundary layer and enhances turbulence, significantly improving cold / heat exchange efficiency while controlling flow resistance. The system highly integrates the core refrigeration components and recovery module within the indoor unit. The secondary circulation loop, as an independent functional module, connects to an external water tank or refrigerator via standardized interfaces, drastically reducing space requirements and simplifying on-site installation and subsequent retrofitting processes.

[0038] 4. Intelligent collaborative control and secure media design ensure reliable operation and extend the lifespan of peripherals.

[0039] The control module collects multi-dimensional data such as refrigerator temperature, water temperature, and medium temperature in real time. Through PID intelligent drive, the circulating power components, switching valves, and auxiliary heating devices work together to achieve seamless switching between multiple modes and optimal energy consumption adjustment. The secondary circulation loop uses water as the heat transfer medium, physically isolating the refrigerant from the domestic water tank / refrigerator liner, fundamentally eliminating the risk of refrigerant leakage. At the same time, the significantly reduced start-stop frequency and running time of the refrigerator compressor effectively reduce mechanical wear, lower operating noise, and significantly extend the refrigerator's service life. The system's overall safety, environmental adaptability, and life-cycle economic efficiency are outstanding. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the system architecture connection of a waste heat recovery air conditioner according to the present invention.

[0041] Figure 2 This is a schematic diagram of the system architecture for waste heat recovery mode;

[0042] Figure 3 This is a schematic diagram of the system architecture for the waste cooling recovery mode;

[0043] Figure 4 , Figure 5 , Figure 6 This is a schematic diagram of a heat exchange structure, with one surface removed to facilitate observation of the internal structure.

[0044] 1-Sealed housing, 1-1-Baffle, 1-2-Baffle plate, 2-Inlet, 3-Outlet, 4-Refrigerant heat exchange tube, 4-1-Inlet, 4-2-Outlet, 4-3-Manifold. Detailed Implementation

[0045] The embodiments of the present invention will be described in detail below. Although the present invention will be described and illustrated in conjunction with some specific embodiments, it should be noted that the present invention is not limited to these embodiments. On the contrary, any modifications or equivalent substitutions made to the present invention should be covered within the scope of the claims of the present invention.

[0046] Furthermore, to better illustrate the present invention, numerous specific details are set forth in the following detailed embodiments. Those skilled in the art will understand that the present invention can be practiced without these specific details.

[0047] I. System Overall Architecture

[0048] This embodiment provides a waste cooling and waste heat recovery air conditioner, mainly composed of four major units: an air conditioning unit (integrated unit), a waste cooling recovery module, a waste heat recovery module, and a central control module. The air conditioning unit integrates a compressor, a four-way reversing valve, a first heat exchange device, and a second heat exchange device. These components are sequentially connected via refrigerant piping to form a closed vapor compression refrigeration / heat pump cycle. The functions of the first and second heat exchange devices are interchanged depending on the switching of the four-way reversing valve: in the refrigeration cycle, the first heat exchange device functions as a condenser, and the second heat exchange device functions as an evaporator; in the heating cycle, the first heat exchange device switches to evaporator operation, and the second heat exchange device switches to condenser operation to supply heat to the room.

[0049] II. Structural Description of Core Components

[0050] 1. First heat exchange device

[0051] The first heat exchange device is the core heat exchange component for achieving directional recovery of cold / heat. For example... Figure 4-6 As shown, it includes a sealed housing 1, which is preferably made of thermally insulated engineering plastic or stainless steel with an outer insulation layer. The housing is equipped with an inlet 2 and an outlet 3, and an internal closed water channel is constructed through partitions 1-1. The partitions 1-1 are arranged alternately along the water flow direction, forming an "S"-shaped meandering path in the water channel, effectively extending the residence time of the secondary heat transfer medium (preferably deionized water or environmentally friendly ethylene glycol aqueous solution) and increasing the effective heat exchange area.

[0052] The refrigerant heat exchange tube 4 runs through and coils within the "S"-shaped water channel, its shape matching the channel profile and also exhibiting an "S"-shaped layout. To enhance heat transfer efficiency, baffles 1-2 are uniformly arranged on the surface of the baffle 1-1. The angle between the baffles and the baffle along the water flow direction is optimized to 45° using fluid dynamics. This angle can significantly disrupt the fluid boundary layer and enhance turbulence intensity while controlling the system flow resistance within a reasonable range. The refrigerant heat exchange tube 4 is preferably configured as two sets connected in parallel. The refrigerant inlet and outlet of the two sets of tubes converge through the manifold 4-3 and are led out of the sealed housing 1, connecting to the refrigerant circulation loop of the air conditioning unit. The heat exchange tubes are made of high thermal conductivity and corrosion-resistant copper or stainless steel to ensure long-term operational reliability and sealing.

[0053] 2. Waste Cooling Recovery Module

[0054] This module is specifically designed for air conditioning heating operation. It includes a secondary refrigerant circulation pipeline (with a secondary heat transfer medium flowing internally), a circulation power component (preferably a low-noise brushless DC circulating water pump), a flow direction switching valve, a refrigerator cooling coil, and a bypass auxiliary heating device. The secondary refrigerant circulation pipeline connects the inlet 2 and outlet 3 of the first heat exchange device. The flow direction switching valve is a three-way solenoid valve, with its common end connected to the medium outlet (outlet 3) of the first heat exchange device via the circulation power component; the first switching end connects to the cooling branch, and the second switching end connects to the bypass branch; after the ends of the cooling branch and the bypass branch merge, they all connect back to the medium inlet (inlet 2) of the first heat exchange device, forming a complete circulation loop.

[0055] 3. Waste heat recovery module

[0056] This module is specifically designed for air conditioning cooling operation. It includes an external water tank, an auxiliary hot water tank, and connecting components. The inlet and outlet of the medium of the first heat exchange device are connected to the external water tank via a circulation pipeline (outlet 3 connects to the inlet of the external water tank, and the outlet of the external water tank is connected back to inlet 2 via a circulation pump). The external water tank has a relatively large volume (e.g., 50-100L) and is used to store domestic chilled water preheated by waste heat from condensation. The external water tank and the auxiliary hot water tank are connected by a connecting pipeline, which is equipped with a one-way valve to ensure that water flows only from the external water tank into the auxiliary hot water tank, preventing backflow when switching operating conditions or when the water pump stops. The auxiliary hot water tank has a significantly smaller volume than the external water tank (e.g., 3-10L) and serves as a constant temperature fine-tuning and instant hot water supply unit. The auxiliary hot water tank integrates an auxiliary heating temperature control device (one or a combination of electric heating tube, PTC heating element, or thin film heater) and a temperature control system.

[0057] III. Control Logic and Workflow

[0058] The central control module serves as the intelligent control hub of the system, employing an embedded MCU or industrial-grade PLC. It is electrically connected to the four-way reversing valve, circulating power component, flow direction switching valve, bypass auxiliary heating device, and auxiliary heating temperature control device, and collects feedback signals in real time from the refrigerator compartment temperature sensor, auxiliary hot water tank temperature sensor, medium temperature sensor, and indoor environment sensor, executing the following coordinated control logic:

[0059] Mode 1: Refrigeration cycle - waste heat recovery (reference) Figure 1 (The line indicated by the red arrow in the middle)

[0060] When the user turns on the air conditioner in cooling mode, the four-way reversing valve switches to the cooling flow path, and the first heat exchange device operates as a condenser. High-temperature, high-pressure refrigerant releases heat into the secondary heat transfer medium flowing through the "S"-shaped water channel within the refrigerant heat exchange tube 4 of the first heat exchange device, causing the medium temperature to rise. The circulation power unit starts, pumping the preheated medium into the external water tank. Warm water in the external water tank, under gravity or pressure difference, slowly replenishes the auxiliary hot water tank through a one-way valve. When the user turns on the hot water terminal or the system detects a drop in the auxiliary hot water tank level, the water temperature sensor in the temperature control system transmits a real-time water temperature signal to the PID controller. The PID controller compares the measured value with the user-set temperature (e.g., 48℃) and dynamically adjusts the heating power of the auxiliary heating temperature control device using a fuzzy adaptive algorithm, achieving rapid temperature rise and precise temperature control within ±1℃ to meet the demand for high-quality domestic hot water. In this mode, the waste cooling recovery module is in standby mode.

[0061] Mode 2: Heating Cycle - Waste Cooling Recovery (Reference) Figure 1 (Green arrow in the middle)

[0062] When the user turns on the air conditioner's heating mode, the four-way reversing valve switches to the heating flow path. The first heat exchanger becomes the evaporator, and the second heat exchanger acts as the condenser to heat the room. The central control module automatically activates the residual heat recovery module and performs intelligent switching based on the refrigerator's load status.

[0063] 1. Cooperative Cooling Mode: When the refrigerator's temperature sensor detects that the internal temperature exceeds a preset upper limit threshold (e.g., 8°C), the controller outputs a command: driving the three-way solenoid valve to switch to the first switching end (connecting the cooling branch), starting the circulation power unit, and shutting off the bypass auxiliary heating device. The low-temperature secondary heat transfer medium, cooled to 5-10°C by the evaporator, flows through the refrigerator's cooling coils, absorbing heat from inside the refrigerator and maintaining the refrigerator's temperature stably within the set range. During this period, the refrigerator's original compressor stops or maintains extremely low-frequency operation, achieving significant energy savings.

[0064] 2. Bypass Insulation Mode: When the refrigerator compartment temperature drops to the preset lower threshold (e.g., 3℃), or when the system is initially not connected to the refrigerator, the controller outputs a command to drive the three-way solenoid valve to switch to the second switching end (connecting the bypass branch). To prevent the evaporator from frosting due to lack of heat absorption load or to avoid a decrease in the overall heating capacity of the air conditioner, the circulation power components continue to operate, and the secondary heat transfer medium circulates within the bypass branch. When the medium return water temperature is lower than the safety threshold (e.g., 4℃), the controller automatically activates the bypass auxiliary heating device to moderately heat the medium, simulating the refrigerator's heat load, ensuring continuous and stable heat absorption by the evaporator, and guaranteeing that the indoor heating effect is not disturbed. The system seamlessly and automatically switches between the above two modes based on real-time feedback from the refrigerator temperature sensor, achieving efficient cascade utilization of residual cold and absolute stability of the main unit's performance.

[0065] Example 1

[0066] This invention provides a waste cooling and waste heat recovery air conditioner, comprising:

[0067] The air conditioning unit is equipped with a compressor, a four-way reversing valve, a first heat exchange device and a second heat exchange device; the first heat exchange device includes a flow channel for the secondary heat transfer medium and is provided with a medium inlet and outlet.

[0068] The waste heat recovery module includes a secondary refrigerant circulation pipeline, circulation power components, flow direction switching valve, refrigerator cooling coil and bypass auxiliary heating device;

[0069] When the air conditioning unit is operating in heating cycle, the first heat exchange device operates in evaporator mode, and the second heat exchange device operates in condenser mode, including:

[0070] The secondary refrigerant circulation pipeline is connected to the medium inlet and outlet of the first heat exchange device. The pipeline is equipped with the circulation power component and the flow direction switching valve. The flow direction switching valve switches the pipeline to a cooling branch connected to the refrigerator cooling coil, or a bypass branch that avoids the refrigerator cooling coil. The bypass auxiliary heating device is located on the bypass branch.

[0071] Waste heat recovery module, external water tank, auxiliary hot water tank and connecting components;

[0072] When the air conditioning unit is running in the refrigeration cycle, the first heat exchange device operates in condenser mode, and the second heat exchange device operates in evaporator mode.

[0073] The medium inlet and outlet of the first heat exchange device are connected to the external water tank through a circulation pipeline; the external water tank is connected to the auxiliary hot water tank through a connecting pipeline, and a one-way valve is provided on the pipeline; the auxiliary hot water tank is equipped with an auxiliary heating temperature control device and a temperature control system.

[0074] The central control module is electrically connected to the four-way reversing valve, the circulating power component, the flow direction switching valve, the bypass auxiliary heating device, and the auxiliary heating temperature control device, respectively, and is used to coordinate the control of each component according to the air conditioning operation mode and the load end temperature signal.

[0075] In the above scheme, the first heat exchange device includes a sealed box 1, on which a water inlet 2 and a water outlet 3 are provided, forming a water channel inside; a refrigerant heat exchange pipe 4 is disposed in the water channel, and the refrigerant inlet and outlet of the refrigerant heat exchange pipe 4 are led out of the sealed box for connection to the refrigerant circulation loop of the air conditioning unit.

[0076] In the above scheme, a partition 1-1 is provided inside the sealed box 1. The partition 1-1 forms an "S"-shaped water channel inside the sealed box 1. The refrigerant heat exchange tube 4 is set as an "S"-shaped structure that matches the "S"-shaped water channel.

[0077] In the above scheme, a baffle plate 1-2 is provided on the baffle plate 1-1, and the angle between the baffle plate 1-2 and the baffle plate 1-1 along the water flow direction is 45°.

[0078] In the above scheme, the refrigerant heat exchange tube 4 is set into 2 groups, and the inlet and outlet of the 2 groups of refrigerant heat exchange tube 4 are led out through the manifold 4-3.

[0079] In the above scheme, the material of the refrigerant heat exchange tube 4 is stainless steel or copper.

[0080] In the above scheme, the flow switching valve is a three-way solenoid valve, whose common end is connected to the medium outlet of the first heat exchange device via the circulating power component, the first switching end is connected to the cooling branch, and the second switching end is connected to the bypass branch; the end of the cooling branch and the end of the bypass branch merge and are connected to the medium inlet of the first heat exchange device.

[0081] In the above scheme, the bypass auxiliary heating device is an online electric heater; the refrigerator cooling coil is made of high thermal conductivity metal pipe, which is laid in the inner wall of the refrigerator or in the insulation layer, and is detachably connected to the cooling branch.

[0082] In the above scheme, the volume of the auxiliary hot water tank is smaller than the volume of the external water tank; the temperature control system includes a water temperature sensor and a PID controller, and the PID controller is used to dynamically adjust the heating power of the auxiliary heating temperature control device according to the real-time water temperature of the auxiliary hot water tank.

[0083] In the above scheme, the auxiliary heating temperature control device is one or a combination of an electric heating tube, a PTC heating element, or a thin film heater.

Claims

1. A waste cooling and waste heat recovery air conditioner, characterized in that, include: The air conditioning unit is equipped with a compressor, a four-way reversing valve, a first heat exchange device and a second heat exchange device; the first heat exchange device includes a flow channel for the secondary heat transfer medium and is provided with a medium inlet and outlet. The waste heat recovery module includes a secondary refrigerant circulation pipeline, circulation power components, flow direction switching valve, refrigerator cooling coil and bypass auxiliary heating device; When the air conditioning unit is operating in heating cycle, the first heat exchange device operates in evaporator mode, and the second heat exchange device operates in condenser mode, including: The secondary refrigerant circulation pipeline is connected to the medium inlet and outlet of the first heat exchange device, and the pipeline is equipped with the circulation power component and the flow direction switching valve. The flow switching valve switches the pipeline to a cooling branch connected to the refrigerator cooling coil, or to a bypass branch that avoids the refrigerator cooling coil; the bypass auxiliary heating device is located on the bypass branch. Waste heat recovery module, external water tank, auxiliary hot water tank and connecting components; When the air conditioning unit is running in the refrigeration cycle, the first heat exchange device operates in condenser mode, and the second heat exchange device operates in evaporator mode. The medium inlet and outlet of the first heat exchange device are connected to the external water tank through a circulation pipeline; the external water tank is connected to the auxiliary hot water tank through a connecting pipeline, and a one-way valve is provided on the pipeline; the auxiliary hot water tank is equipped with an auxiliary heating temperature control device and a temperature control system. The central control module is electrically connected to the four-way reversing valve, the circulating power component, the flow direction switching valve, the bypass auxiliary heating device, and the auxiliary heating temperature control device, respectively, and is used to coordinate the control of each component according to the air conditioning operation mode and the load end temperature signal.

2. The waste cooling and waste heat recovery air conditioner according to claim 1, characterized in that, The first heat exchange device includes a sealed box (1), on which an inlet (2) and an outlet (3) are provided, forming a water channel inside; a refrigerant heat exchange tube (4) is provided in the water channel, and the refrigerant inlet and outlet of the refrigerant heat exchange tube (4) are led out of the sealed box for connection to the refrigerant circulation loop of the air conditioning unit.

3. The waste heat recovery air conditioner according to claim 1, characterized in that, A partition (1-1) is provided inside the sealed box (1). The partition (1-1) forms an "S"-shaped water channel inside the sealed box (1). The refrigerant heat exchange tube (4) is set to an "S"-shaped structure that matches the "S"-shaped water channel.

4. The waste heat recovery air conditioner according to claim 1, characterized in that, A baffle plate (1-2) is provided on the baffle plate (1-1), and the baffle plate (1-2) and the baffle plate (1-1) are at an angle of 45° along the direction of water flow.

5. The waste heat recovery air conditioner according to claim 1, characterized in that, The refrigerant heat exchange tubes (4) are set in two groups, and the inlet and outlet of the two groups of refrigerant heat exchange tubes (4) are led out through the manifold (4-3).

6. The waste heat recovery air conditioner according to claim 5, characterized in that, The material of the refrigerant heat exchange tube (4) is stainless steel or copper.

7. A waste cooling and waste heat recovery air conditioner according to claim 1, characterized in that, The flow switching valve is a three-way solenoid valve. Its common end is connected to the medium outlet of the first heat exchange device via the circulating power component. The first switching end is connected to the cooling branch, and the second switching end is connected to the bypass branch. The end of the cooling branch and the end of the bypass branch merge and are connected to the medium inlet of the first heat exchange device.

8. A waste cooling and waste heat recovery air conditioner according to claim 1, characterized in that, The bypass auxiliary heating device is an online electric heater; the refrigerator cooling coil is made of high thermal conductivity metal pipe, which is laid in the inner wall of the refrigerator or in the insulation layer, and is detachably connected to the cooling branch.

9. A waste cooling and waste heat recovery air conditioner according to claim 1, characterized in that, The volume of the auxiliary hot water tank is smaller than that of the external water tank; the temperature control system includes a water temperature sensor and a PID controller, the PID controller being used to dynamically adjust the heating power of the auxiliary heating temperature control device according to the real-time water temperature of the auxiliary hot water tank.

10. A control method for a waste cooling and waste heat recovery air conditioner as described in any one of claims 1-9, characterized in that, Includes the following steps: Step 1: Obtain the operating mode signal of the air conditioning unit and the real-time temperature signal of each load. Step 2: Switch the refrigerant circulation path of the air conditioning unit according to the operating mode signal, and activate the corresponding residual energy recovery module; Step 3: If the operating mode signal is refrigeration cycle, then control the operation of the waste heat recovery module: drive the circulation power component to make the secondary heat transfer medium circulate and exchange heat between the first heat exchange device and the external water tank, and dynamically adjust the heating power of the auxiliary heat temperature control device through the temperature control system based on the real-time temperature signal of the auxiliary hot water tank. Step 4: If the operating mode signal is heating cycle, control the operation of the residual cold recovery module: based on the real-time temperature signal at the refrigerator load end, control the flow direction switching valve to switch the secondary heat transfer medium to the cooling branch or bypass branch, and control the start and stop of the circulation power component and the bypass auxiliary heating device in conjunction.

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