Freezing and refrigerating waste heat recovery energy-saving system and application process

Abstract

The invention relates to the technical field of energy conservation, and discloses a freezing and refrigerating waste heat recovery energy-saving system and an application process, and the freezing and refrigerating waste heat recovery energy-saving system comprises a refrigeration main circulation module which comprises a condenser used for discharging condensation waste heat; the thermochemical energy storage and regeneration module comprises a regenerator thermodynamically coupled with the condenser, a dilute solution storage tank, a concentrated solution storage tank and a pure water condensation recovery unit, and the regenerator is used for absorbing the condensation waste heat to regenerate a dilute solution into a concentrated solution; the pure water condensation and recovery unit is used for recovering water evaporated in the regeneration process to obtain pure water; and the energy on-demand release and multi-effect utilization module is connected with the dilute solution storage tank and the concentrated solution storage tank to form solution circulation and is used for releasing the chemical energy stored in the concentrated solution on demand. According to the invention, condensation waste heat is recovered and converted into storable chemical energy, and meanwhile, pure water byproducts recovered in the process are utilized to construct internal synergistic interaction circulation of energy and substances.

Description

Technical Field

[0001] This invention relates to the field of energy-saving technology, specifically to an energy-saving system and application process for recovering waste heat from refrigeration and cold storage. Background Technology

[0002] Refrigeration and freezing systems are core infrastructure for ensuring the normal operation of critical industries such as food safety, biomedicine, and cold chain logistics. These systems transfer heat through the phase change cycle of refrigerants, and their core component, the compressor, consumes a large amount of electrical energy during operation. In the refrigeration cycle, an unavoidable aspect is the release of a significant amount of waste heat from condensation into the environment. This heat is essentially the sum of the electrical energy input to the system and the heat absorbed from the refrigerated space; although its energy grade is low, the total amount is enormous. In current technologies, this heat is typically discharged directly into the atmosphere or water through air cooling or water cooling, constituting primary energy waste, directly increasing the system's operating costs, and exacerbating the urban heat island effect.

[0003] To improve system energy efficiency, the industry has developed various energy-saving technologies. A common approach is to use evaporative cooling technology to assist condenser heat dissipation. By evaporating water, heat is carried away, aiming to lower the condensing temperature and thus reduce compressor power consumption. However, this method faces a common technical challenge in practical applications: the quality of the water source. Conventionally used tap water or cooling tower circulating water contains a large amount of dissolved mineral ions such as calcium and magnesium. When water evaporates, these ions continuously concentrate and precipitate, forming hard scale on the heat exchanger surface, packing, and nozzles. Scale has extremely poor thermal conductivity, and its presence severely weakens heat exchange efficiency, causing system performance to continuously decline over time. This necessitates periodic shutdowns for cleaning and chemical descaling, increasing maintenance complexity and operating costs.

[0004] Therefore, how to transform condensation waste heat from an energy liability into a usable asset, while simultaneously addressing the reliability and long-term effectiveness issues of auxiliary energy-saving measures, is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a refrigeration and cold storage waste heat recovery energy-saving system and application process, which solves the problems of direct waste of condensation waste heat that is common in existing refrigeration and cold storage technologies, as well as the long-term unreliability of auxiliary energy-saving measures due to scaling caused by water quality issues.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a refrigeration and cold storage waste heat recovery energy-saving system, comprising: The main cooling cycle module includes a condenser for dissipating waste heat from condensation; The thermochemical energy storage and regeneration module includes a regenerator thermodynamically coupled to the condenser, a dilute solution storage tank, a concentrated solution storage tank, and a pure water condensation recovery unit. The regenerator is used to absorb the waste heat from the condensation to regenerate the dilute solution into a concentrated solution, and the pure water condensation recovery unit is used to recover the water evaporated during the regeneration process to obtain pure water. An energy release and multi-effect utilization module is connected to the dilute solution storage tank and the concentrated solution storage tank to form a solution circulation system, which is used to release the chemical energy stored in the concentrated solution on demand. The by-product closed-loop circulation efficiency enhancement module is connected to the pure water outlet of the pure water condensation and recovery unit, and is used to transport the pure water to the condenser or the energy on-demand release and multi-effect utilization module. The intelligent control module is electrically connected to each of the above modules and is used to monitor the system status and coordinate the collaborative work of each module.

[0007] Preferably, the regenerator is a falling film plate-and-shell heat exchanger, which has a first channel for refrigerant to flow and a second channel for the dilute solution to form a liquid film.

[0008] Preferably, the energy release and multi-effect utilization module includes an absorber, a dehumidification unit, and an indirect evaporative cooler; the outlet of the concentrated solution storage tank is connected to the absorber and the dehumidification unit via branch pipelines respectively; the dry air outlet of the dehumidification unit is connected to the primary air inlet of the indirect evaporative cooler.

[0009] Preferably, the by-product closed-loop circulation enhancement module includes an atomizing nozzle group, which is arranged on the outer surface of the condenser and connected to the pure water outlet of the pure water condensation recovery unit, for spraying pure water mist on the surface of the condenser to enhance heat exchange.

[0010] Preferably, the pure water outlet of the by-product closed-loop circulation enhancement module is also connected to the secondary side water supply interface of the indirect evaporative cooler, for supplying pure water to the indirect evaporative cooler to achieve evaporative cooling.

[0011] Preferably, the refrigeration main cycle module further includes a diverter valve, which is located at the compressor outlet and its outlet is connected to the condenser and the regenerator respectively, so as to distribute high-temperature refrigerant as needed under the control of the intelligent control module.

[0012] Preferably, the intelligent control module is configured to activate the by-product closed-loop circulation enhancement module when the ambient temperature is detected to be higher than a preset high temperature threshold, so as to control the atomizing nozzle group to spray pure water onto the condenser.

[0013] Preferably, the intelligent control module is configured to continuously control the by-product closed-loop circulation enhancement module to supply pure water to the secondary side wet channel of the indirect evaporator when the energy on-demand release and multi-effect utilization module executes the auxiliary cooling mode.

[0014] Preferably, the dehumidification unit is a packed tower, which is filled with structured packing or bulk packing and is equipped with a solution spray distributor and air inlet and outlet to achieve countercurrent contact between air and solution.

[0015] An application process for a refrigeration and cold storage waste heat recovery energy-saving system includes the following steps: S1: The main refrigeration cycle module is in operation, and its condenser generates waste heat from condensation. S2: The regenerator of the thermochemical energy storage and regeneration module absorbs the waste heat from condensation, regenerates the dilute solution into a concentrated solution and stores it in the concentrated solution storage tank, while the pure water condensation recovery unit recovers the pure water in the regeneration process. S3: The energy release and multi-effect utilization module calls the concentrated solution for heating, dehumidification or auxiliary cooling according to energy demand; S4: The by-product closed-loop circulation enhancement module calls upon the pure water and, under the control of the intelligent control module, selectively performs at least one of the following: (a) The pure water is transported to the outer surface of the condenser for spray pre-cooling to reduce the energy consumption of the main refrigeration cycle module; (b) The pure water is delivered to the surface of the heat exchanger used for auxiliary cooling in the energy on-demand release and multi-effect utilization module as an evaporative cooling medium.

[0016] This invention provides an energy-saving system and application process for waste heat recovery in refrigeration and freezing systems. It offers the following advantages: 1. This invention utilizes a thermochemical energy storage and regeneration module that is thermodynamically coupled to the condenser of the main refrigeration cycle module. This module efficiently absorbs and converts the low-grade condensation waste heat that must be discharged during the refrigeration cycle into the chemical potential energy of a liquid desiccant for storage. This transforms heat that would otherwise be directly discarded into a resource for subsequent heating, dehumidification, and other applications, fundamentally improving the overall energy utilization rate of the entire system and reducing total energy consumption.

[0017] 2. This invention incorporates a closed-loop by-product enhancement module, which uses the pure water by-product generated in the thermochemical energy storage and regeneration module to pre-cool the condenser of the main refrigeration cycle module. When the ambient temperature is high, this effectively reduces the refrigerant's condensation temperature and pressure, thereby directly reducing the compressor's power consumption and ensuring the refrigeration system operates efficiently and stably under harsh conditions.

[0018] 3. This invention utilizes a byproduct closed-loop circulation enhancement module to supply pure water to the indirect evaporative cooler in the energy on-demand release and multi-effect utilization module. Because it uses mineral-free pure water, it fundamentally avoids scaling problems caused by water evaporation on the heat exchanger surface, prevents heat exchange efficiency from decreasing over time, ensures long-term high efficiency and stability of auxiliary cooling and other functions, and extends the service life of related components, thereby achieving significant economic and social benefits. Attached Figure Description

[0019] Figure 1 This is a diagram illustrating the system operation steps of the present invention. Detailed Implementation

[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Please see the appendix Figure 1 This invention provides an energy-saving system for recovering waste heat from refrigeration and freezing, comprising: The main cooling cycle module includes a condenser for dissipating waste heat from condensation; The thermochemical energy storage and regeneration module includes a regenerator thermodynamically coupled to the condenser, a dilute solution storage tank, a concentrated solution storage tank, and a pure water condensation recovery unit. The regenerator is used to absorb the waste heat from condensation to regenerate the dilute solution into a concentrated solution, and the pure water condensation recovery unit is used to recover the water evaporated during the regeneration process to obtain pure water. The energy release and multi-effect utilization module is connected to the dilute solution storage tank and the concentrated solution storage tank to form a solution circulation, which is used to release the chemical energy stored in the concentrated solution on demand. The by-product closed-loop circulation enhancement module is connected to the pure water outlet of the pure water condensation and recovery unit, and is used to transport pure water to the condenser or the energy on-demand release and multi-effect utilization module. The intelligent control module is electrically connected to each of the above modules and is used to monitor the system status and coordinate the collaborative work of each module.

[0022] The compressor, expansion valve, and evaporator in the refrigeration main cycle module are conventional components in this technical field, selected and configured according to specific cooling capacity requirements. The key to this embodiment lies in the construction of the condenser, which is designed as a composite heat exchange unit, or works in conjunction with the regenerator in the thermochemical energy storage and regeneration module via a pipeline valve assembly. In one specific embodiment, the condenser and regenerator are an integrated structure, internally divided into a first flow channel, a second flow channel, and a third flow channel. The first flow channel is used for the flow of high-temperature refrigerant from the compressor, the second flow channel is used for the flow of liquid desiccant solution, and the third flow channel is used for the flow of external cooling medium (e.g., air or cooling water). In another embodiment, the condenser is a separate component with a diversion valve upstream. The two outlets of this diversion valve are connected to the inlet of the condenser and the refrigerant inlet of the regenerator, respectively, allowing high-temperature refrigerant to be distributed to the condenser or regenerator as needed. The heat dissipation performance of the condenser to the external cooling medium is determined by the following basic heat conduction relationship: ; in: This represents the heat dissipation power of the condenser to the external cooling medium, measured in watts (W).

[0023] The overall heat transfer coefficient of the condenser is expressed in W / (m²·K).

[0024] This represents the effective heat exchange area of ​​the condenser, expressed in m².

[0025] This is the logarithmic mean temperature difference between the refrigerant and the cooling medium, expressed in Kelvin (K).

[0026] In the thermochemical energy storage and regeneration module, the regenerator, as the core heat exchange component, is specifically constructed as a falling film plate-shell heat exchanger. This heat exchanger contains a group of plates, with a first channel and a second channel formed between the plates. The first channel allows the refrigerant to flow and condense, releasing heat, while the second channel allows the liquid desiccant solution to flow. A solution distributor is installed at the top of the second channel to ensure that the dilute solution forms a uniform liquid film on the plate surface, thereby maximizing the heat transfer area during heat absorption and improving moisture evaporation efficiency. This structural design aims to maximize the product of the overall heat transfer coefficient and the heat exchange area; its heat exchange capacity is described by the following relationship: ; in: The heat power absorbed by the regenerator, measured in W.

[0027] The total heat transfer coefficient of the regenerator is expressed in W / (m²·K).

[0028] This represents the effective heat exchange area of ​​the regenerator, expressed in m².

[0029] The logarithmic mean temperature difference between the refrigerant and the solution is expressed in Kelvin (K). The plates are made of materials resistant to chloride ion corrosion, such as 316L stainless steel or titanium alloy. Both dilute and concentrated solution storage tanks are sealed containers with corrosion-resistant linings, made of polypropylene or fiberglass, and equipped with ultrasonic level sensors to monitor solution levels in real time. The pure water condensation and recovery unit is specifically constructed as a finned tube heat exchanger, whose inlet is connected to the steam outlet of the regenerator, condensing steam into pure water through forced air cooling or natural convection.

[0030] In the energy on-demand release and multi-effect utilization module, the absorber is specifically constructed as a compact plate heat exchanger, with alternating solution flow channels and heated medium (e.g., domestic hot water) flow channels inside. Turbulence structures are incorporated within the solution flow channels to enhance mixing and heat transfer during moisture absorption. The dehumidification unit is specifically constructed as a packed tower, filled with structured or bulk packing material made of corrosion-resistant engineering plastics to provide a large gas-liquid contact surface area. A solution spray distributor is located at the top of the tower, an air inlet at the bottom, and a dry air outlet at the top, thus achieving countercurrent contact between air and solution. The mass transfer efficiency of this process is determined by the following relationship: ; in: This represents the mass flow rate of moisture removed from the air, expressed in kg / s.

[0031] The mass transfer coefficient is based on the humidity difference and is expressed in kg / (m²·s).

[0032] The effective gas-liquid contact area within the dehumidification unit is expressed in m².

[0033] This represents the logarithmic mean humidity difference between the air and solution interfaces. In another embodiment, the dehumidification unit can also be a hollow fiber membrane contactor. The indirect evaporative cooler is specifically constructed as a cross-flow plate heat exchanger, consisting of multiple layers of thermally conductive aluminum plates with a hydrophilic coating, forming mutually perpendicular and non-communicating primary dry channels and secondary wet channels between the plates. Its cooling performance is typically measured by air handling efficiency. ; in: The air handling efficiency of the indirect evaporative cooler is dimensionless.

[0034] The dry-bulb temperature of the air entering the primary side dry channel is expressed in Kelvin (K).

[0035] The dry-bulb temperature of the air leaving the primary side dry channel, in K.

[0036] The wet-bulb temperature of the air entering the secondary side wet passage is expressed in Kelvin (K).

[0037] In the by-product closed-loop circulation enhancement module, the enhancement water pump is either a metering pump with precise flow control or a centrifugal pump driven by a frequency converter to achieve precise regulation of the pure water supply. The atomizing nozzle assembly consists of multiple high-pressure atomizing nozzle arrays, with nozzles made of stainless steel or ceramic to ensure durability. This nozzle assembly is installed on the windward side of the condenser, and its arrangement and spray angle are optimized to ensure that the sprayed water mist can completely cover the condenser fin surface, and that the droplet size is small enough to complete evaporation before contacting the fins or instantaneously on the fin surface.

[0038] In the intelligent control module, the central controller is a programmable logic controller (PLC). This module integrates multiple sets of sensors to acquire system status parameters. Temperature sensors are located at the fluid inlet and outlet of each module, inside the storage tank, and in the ambient air; pressure sensors are located at the suction and discharge ends of the compressor; humidity sensors are located at the air inlet and outlet of the dehumidification unit; and solution concentration sensors are online densitometers or refractometers installed on the main solution circulation pipeline. All sensor signals are connected to the PLC's input module. The PLC's output module is connected to the drivers of each pump and the solenoid control valves on each pipeline. For example, when dynamically optimizing the flow rate of the solution pump, a proportional-integral-derivative (PID) control algorithm can be used, and its general form of control law is: ; in: The output signal of the controller at time t (e.g., the frequency of the driver).

[0039] This represents the deviation between the set value and the measured value.

[0040] This is the proportional gain coefficient.

[0041] This is the integral gain coefficient.

[0042] This is the differential gain coefficient.

[0043] An application process for a refrigeration and cold storage waste heat recovery energy-saving system includes the following steps: S1: The main refrigeration cycle module is running, and its condenser generates waste heat from condensation. S2: The regenerator of the thermochemical energy storage and regeneration module absorbs the waste heat from condensation, regenerates the dilute solution into a concentrated solution and stores it in the concentrated solution storage tank, while the pure water condensation recovery unit recovers the pure water during the regeneration process. S3: The energy release and multi-effect utilization module calls concentrated solution for heating, dehumidification or auxiliary cooling according to energy demand; S4: The by-product closed-loop circulation enhancement module calls for pure water and, under the control of the intelligent control module, selectively performs at least one of the following: (a) Pure water is sprayed onto the outer surface of the condenser for pre-cooling to reduce the energy consumption of the main refrigeration cycle module; (b) Pure water is delivered to the surface of the heat exchanger used for auxiliary cooling in the energy on-demand release and multi-effect utilization module as an evaporative cooling medium.

[0044] The specific steps in this embodiment are as follows: S101: When the refrigeration main cycle module is running, the compressor discharges high-temperature and high-pressure refrigerant gas, which enters the condenser that exchanges heat with the regenerator or directly enters the refrigerant flow channel of the regenerator.

[0045] S102: The intelligent control module starts the first solution pump, which pumps the low-concentration liquid desiccant in the dilute solution storage tank to the solution channel of the regenerator at a preset mass flow rate.

[0046] S103: Inside the regenerator, the dilute solution absorbs the heat released by the refrigerant condensation, causing its own temperature to rise. The internal moisture evaporates into water vapor, and the solution concentration increases accordingly.

[0047] S104: The solution after the concentration is increased, i.e. the concentrated solution, flows out of the regenerator and enters the concentrated solution storage tank for storage. At this time, the waste heat of the refrigerant has been converted into the chemical potential of the concentrated solution.

[0048] S105: Water vapor evaporated from the solution is guided to the pure water condensation and recovery unit, where it is cooled and condensed into pure water, which is then collected into the pure water storage tank for later use.

[0049] The energy release phase, also known as the on-demand multi-efficiency utilization process, involves the intelligent control module selecting one or more of the following modes based on external energy demand signals: The implementation steps for the heating mode are as follows: S201: When a hot water demand signal is detected, the intelligent control module starts the second solution pump to pump the concentrated solution in the concentrated solution storage tank to the absorber.

[0050] S202: Simultaneously, a measured amount of purified water or humid air is injected into the absorber. The concentrated solution absorbs moisture within the absorber, undergoing an exothermic reaction and releasing heat power.

[0051] S203: This heat power, through the heat exchange structure of the absorber, heats an independent hot water circulation loop, thereby producing domestic or process hot water. The solution concentration decreases after the absorption process, becoming a dilute solution, and is then returned to the dilute solution storage tank.

[0052] The steps to implement dehumidification mode are as follows: S211: When the humidity of the environment or a specific space is detected to be higher than the set value, the intelligent control module starts the second solution pump to pump the concentrated solution to the dehumidification unit.

[0053] S212: The humid air to be treated is sent into the dehumidification unit by the fan, and comes into countercurrent or cross-flow contact with the concentrated solution.

[0054] S213: By utilizing the extremely low surface water vapor pressure of a concentrated solution, moisture in the air is absorbed by the solution, thereby outputting dry air that meets the requirements.

[0055] The steps to implement the auxiliary cooling mode are as follows: S221: When this mode is started, the dehumidification mode is executed first, and the generated dry air is used as the working fluid.

[0056] S222: Directs dry air to the primary dry channel of the indirect evaporative cooler.

[0057] S223: The intelligent control module starts the efficiency-enhancing water pump to transport pure water from the pure water storage tank to the secondary side wet channel of the indirect evaporative cooler, keeping its surface moist.

[0058] S224: When dry air flows through the primary side, it causes the pure water on the secondary side to evaporate through the plates. The evaporation process absorbs a large amount of heat, thereby reducing the temperature of the air or water to be cooled flowing through another independent channel of the indirect evaporative cooler, producing a cooling effect.

[0059] The steps to improve the energy efficiency of the main circulation cycle are as follows: S301: The intelligent control module monitors the ambient temperature in real time. When the temperature exceeds the preset high temperature threshold, this process is initiated.

[0060] S302: The intelligent control module starts the efficiency-enhancing water pump, which pumps the pure water in the pure water storage tank to the atomizing nozzle assembly at a precisely controlled flow rate.

[0061] S303: After being atomized, pure water is evenly sprayed onto the outer surface of the condenser of the main cooling cycle module and evaporates rapidly.

[0062] S304: Moisture evaporation absorbs heat from the condenser, producing a pre-cooling effect that effectively reduces the condensation temperature and pressure of the refrigerant, thereby reducing the power consumption of the compressor.

[0063] The steps to ensure auxiliary cooling efficiency are as follows: S311: Throughout the execution of the auxiliary cooling mode, the intelligent control module continuously controls the efficiency-enhancing water pump to supply pure water to the secondary side wet channel of the indirect evaporative cooler.

[0064] S312: Because it uses pure water, it fundamentally avoids the problem of scaling on the heat exchange plates caused by the precipitation of minerals in the water, thus ensuring the high heat exchange efficiency of the indirect evaporative cooler during long-term operation and ensuring the stability and reliability of the auxiliary cooling capacity.

[0065] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A refrigeration and cold storage waste heat recovery energy-saving system, characterized in that, include: The main cooling cycle module includes a condenser for dissipating waste heat from condensation; The thermochemical energy storage and regeneration module includes a regenerator thermodynamically coupled to the condenser, a dilute solution storage tank, a concentrated solution storage tank, and a pure water condensation recovery unit. The regenerator is used to absorb the waste heat from the condensation to regenerate the dilute solution into a concentrated solution, and the pure water condensation recovery unit is used to recover the water evaporated during the regeneration process to obtain pure water. An energy release and multi-effect utilization module is connected to the dilute solution storage tank and the concentrated solution storage tank to form a solution circulation system, which is used to release the chemical energy stored in the concentrated solution on demand. The by-product closed-loop circulation efficiency enhancement module is connected to the pure water outlet of the pure water condensation and recovery unit, and is used to transport the pure water to the condenser or the energy on-demand release and multi-effect utilization module. The intelligent control module is electrically connected to each of the above modules and is used to monitor the system status and coordinate the collaborative work of each module.

2. The energy-saving system for waste heat recovery in refrigeration and freezing as described in claim 1, characterized in that, The regenerator is a falling film plate-and-shell heat exchanger, which has a first channel for refrigerant to flow and a second channel for the dilute solution to form a liquid film.

3. The energy-saving system for waste heat recovery in refrigeration and freezing as described in claim 1, characterized in that, The energy release and multi-effect utilization module includes an absorber, a dehumidification unit, and an indirect evaporative cooler; the outlet of the concentrated solution storage tank is connected to the absorber and the dehumidification unit via branch pipelines; the dry air outlet of the dehumidification unit is connected to the primary air inlet of the indirect evaporative cooler.

4. The energy-saving system for waste heat recovery in refrigeration and freezing as described in claim 1, characterized in that, The by-product closed-loop circulation enhancement module includes an atomizing nozzle group, which is arranged on the outer surface of the condenser and connected to the pure water outlet of the pure water condensation recovery unit. It is used to spray pure water mist on the surface of the condenser to enhance heat exchange.

5. The energy-saving system for waste heat recovery in refrigeration and freezing as described in claim 3, characterized in that, The pure water outlet of the by-product closed-loop circulation enhancement module is also connected to the secondary side water supply interface of the indirect evaporative cooler, for supplying pure water to the indirect evaporative cooler to achieve evaporative cooling.

6. The energy-saving system for waste heat recovery in refrigeration and freezing as described in claim 5, characterized in that, The main refrigeration cycle module further includes a diverter valve, which is located at the compressor outlet and its outlet is connected to the condenser and the regenerator respectively, so as to distribute high-temperature refrigerant as needed under the control of the intelligent control module.

7. The energy-saving system for waste heat recovery in refrigeration and freezing as described in claim 4, characterized in that, The intelligent control module is configured to activate the byproduct closed-loop circulation enhancement module when the ambient temperature is detected to be higher than a preset high temperature threshold, so as to control the atomizing nozzle group to spray pure water onto the condenser.

8. The energy-saving system for waste heat recovery in refrigeration and freezing as described in claim 5, characterized in that, The intelligent control module is configured to continuously control the byproduct closed-loop circulation enhancement module to supply pure water to the secondary side wet channel of the indirect evaporator when the energy on-demand release and multi-effect utilization module executes the auxiliary cooling mode.

9. The energy-saving system for waste heat recovery in refrigeration and freezing as described in claim 3, characterized in that, The dehumidification unit is a packed tower, which is filled with structured packing or bulk packing, and is equipped with a solution spray distributor and air inlet and outlet to achieve countercurrent contact between air and solution.

10. An application process for a refrigeration and cold storage waste heat recovery energy-saving system, used in the refrigeration and cold storage waste heat recovery energy-saving system according to any one of claims 1-9, characterized in that, Includes the following steps: S1: The main refrigeration cycle module is in operation, and its condenser generates waste heat from condensation. S2: The regenerator of the thermochemical energy storage and regeneration module absorbs the waste heat from condensation, regenerates the dilute solution into a concentrated solution and stores it in the concentrated solution storage tank, while the pure water condensation recovery unit recovers the pure water in the regeneration process. S3: The energy release and multi-effect utilization module calls the concentrated solution for heating, dehumidification or auxiliary cooling according to energy demand; S4: The by-product closed-loop circulation enhancement module calls upon the pure water and, under the control of the intelligent control module, selectively performs at least one of the following: (a) The pure water is transported to the outer surface of the condenser for spray pre-cooling to reduce the energy consumption of the main refrigeration cycle module; (b) The pure water is delivered to the surface of the heat exchanger used for auxiliary cooling in the energy on-demand release and multi-effect utilization module as an evaporative cooling medium.

Images