System for recovering cooling capacity of terrace of low-temperature warehouse and control method of system

Abstract

The invention discloses a low-temperature warehouse terrace cooling capacity recycling system and a control method. The system comprises a heat exchanger, a terrace anti-freezing solution loop and a hall water system loop. The terrace anti-freezing solution loop exchanges heat with the hall water system loop through the heat exchanger; the terrace anti-freezing solution loop comprises an anti-freezing solution collecting pipe, an anti-freezing solution distributing pipe, a liquid collecting pipe electromagnetic valve, a liquid distributing pipe electromagnetic valve and a low-temperature warehouse terrace; the anti-freezing liquid collecting pipe and the anti-freezing liquid distributing pipe are respectively connected with the low-temperature warehouse terrace and the heat exchanger, and the anti-freezing liquid collecting pipe is provided with a liquid collecting pipe electromagnetic valve; a liquid separation pipe electromagnetic valve is arranged on the anti-freezing liquid separation pipe; the penetrating water system loop comprises a penetrating liquid supply electromagnetic valve, a water pump, a penetrating liquid return pipe, a penetrating liquid supply pipe, a cold storage water tank and an air cooler; and the penetrating liquid return pipe and the penetrating liquid supply pipe are respectively connected with the air cooler and the heat exchanger. The terrace anti-freezing solution loop and the hall-penetrating water system loop are mutually independent, cold storage control using terrace cooling capacity does not relate to a refrigerating system, and control logic is simplified.

Description

Technical Field

[0001] This invention belongs to the field of low-temperature storage technology, and in particular relates to a system for recovering the cold energy of a low-temperature storage floor and its control method. Background Technology

[0002] Cold storage is a warehouse that uses cooling equipment to create a low-temperature environment. Due to the large temperature difference between the inside and outside of the cold storage, even if the ground is covered with insulation material, the cold energy transmitted from the cold storage to the ground through the insulation layer will cool the soil below the surface. The water in the soil freezes and causes the floor to crack.

[0003] There are three approaches to preventing frost damage to the cold storage floor: floor ventilation, electric heating, and liquid heating. Floor ventilation is convenient to manage and reliable, but is limited by floor height and the surrounding structure. Electric heating consumes a significant amount of electricity, especially given the constraints of cold storage projects. Therefore, considering factors such as heat recovery from the refrigeration system and low initial investment, a liquid circulation system for floor heating is the preferred approach for frost protection.

[0004] The temperature requirement for the low-temperature passageway of a cold storage facility is generally between 0 and 10°C. In order to quickly and effectively absorb the heat brought in by the outside air and "hot goods", the passageway needs to have a cooling supply, so a refrigeration system also needs to be installed.

[0005] Existing technology 1 discloses the use of exhaust heat from refrigeration units for floor antifreeze, providing a design concept for the feasibility of utilizing the cold energy of low-temperature warehouse floors. This method of using compressor unit exhaust for heat exchange can utilize the waste heat in the system and has a certain economic advantage. However, in this method, when the high-temperature gas transfers heat to the refrigeration oil, some condensation occurs, which leads to liquid carryover in the vapor in the gas circuit and reduces the heat exchanger's heat exchange efficiency.

[0006] Prior art 2 discloses a refrigeration system for a cold storage, comprising: a cold air blower installed inside the cold storage; a water collection tray installed at the bottom of the cold air blower for collecting condensate and defrost water generated by the cold air blower; a cold storage device, wherein the water collection tray is connected to the cold storage device via a first pipe, and the water in the water collection tray flows through the cold storage device for cold storage and heat exchange; and an auxiliary defrost spray pipe installed on the cold air blower, wherein the cold storage device is connected to the auxiliary defrost spray pipe via a second pipe, and the auxiliary defrost spray pipe is equipped with a solenoid valve. However, the shortcomings of the prior art 2 are as follows: the source of cooling capacity is the condensate water generated during the operation of the air cooler or the defrost water generated during defrosting. When the cooling source is the condensate water and defrost water from the terminal fan, the amount of cooling capacity cannot be guaranteed (there is no cooling capacity supply before the fan generates condensate water and defrost water). Therefore, when using this part of the cooling capacity to pass through the corridor, sufficient cooling capacity cannot be guaranteed. At most, it can only reduce the running time of the corridor cooling system, but it cannot eliminate the need for the corridor cooling system. At the same time, the prior art 2 uses an open system to collect condensate water and defrost water. Over time, dirt and blockage will easily occur at the cold storage device, which is inconvenient to clean. Prior art 3 discloses a multi-functional cold storage air cooler. One side of the air cooler's body is equipped with an evaporative cooling coil and a refrigerant coil, and the lower part is equipped with a defrost water collection pan and a defrost drain pipe. The other side of the air cooler's body is equipped with an air circulation fan. The low-temperature, low-pressure liquid refrigerant inlet of the evaporative cooling coil is connected to the expansion valve outlet of the cold storage refrigeration system, and the low-temperature, low-pressure gaseous refrigerant outlet is connected to the compressor suction port of the cold storage refrigeration system. The refrigerant coil inlet is connected to the outlet of the refrigerant coil inlet three-way valve, and the refrigerant coil outlet is connected to the inlet of the refrigerant coil outlet three-way valve. However, the shortcomings of the prior art 3 are as follows: Prior art 3 is only used when the refrigeration system stops to take part of the cold energy from the floor for refrigeration of the cold storage when the low temperature warehouse is heated to the temperature of the fresh storage warehouse. This part of the cold energy will not reduce the refrigeration system of the fresh storage warehouse. When the cold energy from the floor is used up, the corresponding refrigeration system of the fresh storage warehouse still needs to be turned on. Therefore, prior art 3 can only reduce the running time of the refrigeration system of the target fresh storage warehouse and lacks the corresponding control logic. In addition, the multi-functional fan usage logic of this patent shows that the switching between the low temperature warehouse refrigeration and the floor antifreeze function is achieved by the fan three-way valve. The two affect each other and cannot be operated at the same time.

[0007] Therefore, there is an urgent need to provide a system for recovering the cold energy of the floor in a low-temperature storage facility and its control method. Summary of the Invention

[0008] To address the shortcomings of existing technologies, this invention provides a system for recovering the cold energy of a low-temperature storage floor and its control method; it solves the following technical problems: (1) The temperature of the cold storage low-temperature passageway is generally required to be lower than the normal temperature as a "buffer room" connecting the outside world and the cold storage. The required refrigeration equipment load is relatively small, but a refrigeration system still needs to be configured.

[0009] (2) Traditional liquid heating system design utilizes the heat of high-temperature gas discharged from the compressor. After being cooled by the heat exchanger, the gas is prone to carry liquid in the circuit.

[0010] (3) The cold energy transferred from the low-temperature cold room to the floor is heated by the system's waste heat, so the cold energy of the floor is "offset", and the cold energy of the floor is not fully utilized.

[0011] The present invention adopts the following technical solution.

[0012] The first aspect of this invention provides a system for recovering the cold energy of a low-temperature warehouse floor, comprising: The system includes a heat exchanger, a floor antifreeze solution circuit, and a through-hall water system circuit; the floor antifreeze solution circuit exchanges heat with the through-hall water system circuit through the heat exchanger. The antifreeze solution circuit for the floor includes an antifreeze collection pipe, an antifreeze distribution pipe, a collection pipe solenoid valve, a distribution pipe solenoid valve, and a low-temperature storage floor. The antifreeze collection pipe and the antifreeze distribution pipe are respectively connected to the low-temperature storage floor and the heat exchanger. The collection pipe solenoid valve is installed on the antifreeze collection pipe. The distribution pipe solenoid valve is installed on the antifreeze distribution pipe. The through-hall water system circuit includes a through-hall liquid supply solenoid valve, a water pump, a through-hall return pipe, a through-hall liquid supply pipe, a cold water storage tank, and a cooler. The through-hall liquid supply solenoid valve is used to control whether cooling water is sent to the cold water storage tank and the cooler. The water pump is used to provide power for the cooling water. The cooler is used to provide cooling capacity for the low-temperature through-hall. The cold water storage tank is used to store excess cooling capacity. The through-hall return pipe and the through-hall liquid supply pipe are respectively connected to the cooler and the heat exchanger.

[0013] Preferably, the antifreeze solution circuit for the floor further includes a temperature sensor, which is installed in the floor of the low-temperature storage facility to determine whether the floor of each low-temperature storage facility needs to be heated.

[0014] Preferably, the antifreeze manifold includes a main manifold and branch manifolds; The main manifold is connected to the branch manifold via the liquid collection pipe solenoid valve, and the main manifold is connected to the heat exchanger, while the branch manifold is connected to the floor of the low-temperature storage facility. The antifreeze distribution pipe includes a main branch pipe and branch pipes; The main branch pipe is connected to the branch pipe via the solenoid valve of the liquid distribution pipe, and the main branch pipe is connected to the heat exchanger, while the branch pipe is connected to the floor of the low-temperature storage room.

[0015] Preferably, the manifold branch is used to discharge the antifreeze after absorbing the cold energy of the floor of each of the low-temperature warehouses; The main manifold is used to collect the antifreeze from each of the branch manifolds and send it to the heat exchanger for heat exchange. The main branch pipe is used to receive the antifreeze after heat exchange and temperature rise; The branch pipes are used to receive the heated antifreeze from the main branch pipes and deliver it to the floors of each of the low-temperature storage facilities for heating the floors of each facility.

[0016] Preferably, the manifold branch includes a first manifold branch, a second manifold branch, and a third manifold branch; The branch lines under management include a first branch line, a second branch line, and a third branch line; The liquid collection tube solenoid valve includes a first liquid collection tube solenoid valve, a second liquid collection tube solenoid valve and a third liquid collection tube solenoid valve. The liquid distribution tube solenoid valve includes a first liquid distribution tube solenoid valve, a second liquid distribution tube solenoid valve and a third liquid distribution tube solenoid valve. The low-temperature warehouse floor includes a first low-temperature warehouse floor, a second low-temperature warehouse floor, and a third low-temperature warehouse floor; The main manifold is connected to the first branch manifold via the first liquid collection pipe solenoid valve, and the first branch manifold is connected to the floor of the first low-temperature storage facility; the main manifold is connected to the second branch manifold via the second liquid collection pipe solenoid valve, and the second branch manifold is connected to the floor of the second low-temperature storage facility; the main manifold is connected to the third branch manifold via the third liquid collection pipe solenoid valve, and the third branch manifold is connected to the floor of the third low-temperature storage facility. The main branch pipe is connected to the first branch pipe via the first liquid distribution pipe solenoid valve, and the first branch pipe is connected to the floor of the first low-temperature storage room; the main branch pipe is connected to the second branch pipe via the second liquid distribution pipe solenoid valve, and the second branch pipe is connected to the floor of the second low-temperature storage room; the main branch pipe is connected to the third branch pipe via the third liquid distribution pipe solenoid valve, and the third branch pipe is connected to the floor of the third low-temperature storage room.

[0017] Preferably, the through-hall liquid supply solenoid valve includes a first liquid supply solenoid valve, a second liquid supply solenoid valve, a third liquid supply solenoid valve, and a fourth liquid supply solenoid valve. The water pump includes a first water pump and a second water pump; The first liquid supply solenoid valve is connected to the cold water storage tank and the through-hall liquid supply pipe; the second liquid supply solenoid valve is connected to the cold water storage tank and the through-hall return liquid pipe; the third liquid supply solenoid valve is connected to the through-hall return liquid pipe and the through-hall liquid supply pipe; the fourth liquid supply solenoid valve is connected to the air cooler and the cold water storage tank; the first water pump is installed on the through-hall return liquid pipe; the second water pump is installed between the air cooler and the cold water storage tank.

[0018] A second aspect of the present invention provides a cryogenic storage facility, comprising: The above-mentioned system for recovering the cold energy of the low-temperature warehouse floor.

[0019] A third aspect of the present invention provides a method for controlling the cooling capacity of a low-temperature warehouse floor cooling capacity system based on the above-described system, comprising: Low-temperature warehouse floor heating mode: Collect the temperature of each temperature sensing bulb in each low-temperature warehouse, calculate the average temperature ti of the floor of each low-temperature warehouse, set the first temperature t_S, and determine the relationship between ti and t_S; If ti≤t_S, open the solenoid valves of the liquid collection pipe and the liquid distribution pipe corresponding to the i-th low-temperature storage floor, fill the floor antifreeze on the heat exchanger shell side, exchange heat with the cooling water in the heat exchanger tube, and send the cooling water to each low-temperature passage after obtaining the cold energy. Real-time monitoring of the temperature of each low-temperature passageway to determine whether the temperature of each low-temperature passageway meets the operating requirements; When the temperature of the low-temperature passageway meets the operating requirements or when no operation is required at night, control the liquid supply solenoid valve and water pump so that the passageway water system loop flows through the cold storage tank, and the excess cold energy of the low-temperature warehouse floor is stored in the cold storage tank. When the temperature of the low-temperature passageway does not meet the requirements during operation and cooling is required, it is determined whether the cooling capacity provided by the low-temperature warehouse floor is sufficient for the cooling capacity required by the low-temperature passageway. If it is sufficient, the liquid supply solenoid valve and water pump are controlled so that the air cooler provides cooling capacity to the low-temperature passageway, and the cold storage water tank starts to store cold. When the cooling capacity provided by the low-temperature warehouse floor is insufficient to meet the cooling capacity required by the low-temperature passageway, the liquid supply solenoid valve and water pump are controlled to simultaneously supply the cooling capacity of the low-temperature warehouse floor and the cooling capacity of the cold storage water tank to the low-temperature passageway for cooling.

[0020] Preferably, it also includes a mode where the low-temperature warehouse floor is not heated; Determine whether the floor temperature of the low-temperature warehouse meets the antifreeze requirements. If ti ≥ t_S, close the solenoid valves of the collection pipe and the distribution pipe on the corresponding floor antifreeze solution circuit, and the low-temperature warehouse floor will stop providing cooling. The temperature of the floor in each low-temperature warehouse is monitored in real time to determine whether the floor needs to be heated. If heating is required, the system switches to the low-temperature warehouse floor heating mode.

[0021] A fourth aspect of the present invention provides a terminal, including a processor and a storage medium; characterized in that: The storage medium is used to store instructions; The processor is used to perform the steps of the above method according to the instructions.

[0022] A fifth aspect of the present invention provides a computer-readable storage medium having a computer program stored thereon that, when executed by a processor, implements the steps of the above-described method.

[0023] The beneficial effects of this invention are compared with those of the prior art: (1) The present invention centrally recovers and utilizes the cold energy of the low-temperature warehouse floor, and the recovered cold energy is supplied to the passageway for cooling, which can save a set of refrigeration systems corresponding to the passageway.

[0024] (2) The heat source for the floor antifreeze of the present invention is the heat from the passageway, and does not provide heat from the system, thus simplifying the system's refrigeration circulation pipeline.

[0025] (3) In this invention, the floor antifreeze solution circuit and the through water system circuit are independent of each other. The cold storage control using the floor cold energy does not involve the refrigeration system, and the control logic is simplified.

[0026] (4) The present invention adopts a closed system floor antifreeze solution loop, and the cold storage device is equipped with a special control system to ensure that the overall circulation is simple, the pipeline is relatively simple, the cost is low, and the maintenance is convenient.

[0027] (5) The floor antifreeze solution circuit and the through-hall water system circuit of the present invention are independent of each other, thereby ensuring the stability of the cold source. By controlling the logic to monitor the floor temperature of the low-temperature warehouse and the usage time of the low-temperature through-hall, the cold storage device can achieve the beneficial effect of saving the through-hall refrigeration system while ensuring the floor antifreeze. Attached Figure Description

[0028] Figure 1 This is a diagram of the floor cooling capacity comprehensive utilization system of the present invention; Figure 2 This is a control flowchart of the floor cooling capacity comprehensive utilization system of the present invention; The labels and corresponding component names in the diagram are shown below: 1. First liquid supply solenoid valve; 2. Second liquid supply solenoid valve; 3. Third liquid supply solenoid valve; 4. Fourth liquid supply solenoid valve; 5. First water pump; 6. Second water pump; 7-1. First manifold solenoid valve; 7-2. Second manifold solenoid valve; 7-3. Third manifold solenoid valve; 8-1. First solenoid valve for the liquid distribution tube; 8-2. Second solenoid valve for the liquid distribution tube; 8-3. Third solenoid valve for the liquid distribution tube; 9-1, First low-temperature warehouse floor; 9-2, Second low-temperature warehouse floor; 9-3, Third low-temperature warehouse floor. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this invention. The embodiments described in this application are merely some embodiments of this invention, and not all embodiments. Based on the spirit of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this invention.

[0030] Example 1 like Figure 1-2 As shown, Embodiment 1 of the present invention proposes a system for recovering the cold energy of a low-temperature warehouse floor, including a heat exchanger, a floor antifreeze solution loop, and a through-hall water system loop; wherein, the floor antifreeze solution loop exchanges heat with the through-hall water system loop through the heat exchanger, and the two water circuits are independent of each other.

[0031] The antifreeze solution circuit for the floor includes a temperature sensor (not shown in the figure), an antifreeze manifold, an antifreeze distributor, a manifold solenoid valve, a distributor solenoid valve, and the low-temperature storage floor. The temperature sensor is installed in the low-temperature storage floor to determine whether each floor needs heating. The low-temperature storage floor and the heat exchanger are connected via the antifreeze manifold and the antifreeze distributor. The antifreeze manifold transfers the cold energy from the low-temperature storage floor to the heat exchanger, while the antifreeze distributor returns the antifreeze after heat exchange to the low-temperature storage floor to reabsorb the cold energy. Both the antifreeze manifold and the antifreeze distributor are connected to the low-temperature storage floor and the heat exchanger, respectively. The antifreeze manifold is equipped with a manifold solenoid valve, and the antifreeze distributor is equipped with a distributor solenoid valve.

[0032] The antifreeze manifold includes a main manifold and branch manifolds; the branch manifolds include a first branch manifold, a second branch manifold, and a third branch manifold; the antifreeze distributor includes a main branch manifold and branch branch manifolds; the branch branch manifolds include a first branch branch manifold, a second branch branch manifold, and a third branch branch manifold; the manifold solenoid valves include a first manifold solenoid valve 7-1, a second manifold solenoid valve 7-2, and a third manifold solenoid valve 7-3; the distributor solenoid valves include a first distributor solenoid valve 8-1, a second distributor solenoid valve 8-2, and a third distributor solenoid valve 8-3; the cryogenic storage floor includes a first cryogenic storage floor 9-1, a second cryogenic storage floor 9-2, and a third cryogenic storage floor 9-3.

[0033] The main manifold is connected to the branch manifolds via a liquid collection pipe solenoid valve, and the main manifold is connected to the heat exchanger, while the branch manifolds are connected to the floor of the low-temperature storage facility. The branch manifolds are connected to the branch manifolds via a liquid distribution pipe solenoid valve, and the branch manifolds are connected to the heat exchanger, while the branch manifolds are connected to the floor of the low-temperature storage facility.

[0034] The manifold branch lines are used to discharge the antifreeze after absorbing the cold energy of the floor of each low-temperature warehouse; the manifold main line is used to collect the antifreeze from each manifold branch line and send it to the heat exchanger for heat exchange; the branch main line is used to receive the antifreeze after the heat exchange and heating; the branch line is used to receive the antifreeze after the heating in the branch main line and transport it to the floor of each low-temperature warehouse for heating.

[0035] The main manifold is connected to the first manifold branch via the first manifold solenoid valve 7-1, and the first manifold branch is connected to the first low-temperature storage floor 9-1; the main manifold is connected to the second manifold branch via the second manifold solenoid valve 7-2, and the second manifold branch is connected to the second low-temperature storage floor 9-2; the main manifold is connected to the third manifold branch via the third manifold solenoid valve 7-3, and the third manifold branch is connected to the third low-temperature storage floor 9-3.

[0036] The main branch pipe is connected to the first branch pipe via the first distribution pipe solenoid valve 8-1, and the first branch pipe is connected to the first low-temperature storage floor 9-1; the main branch pipe is connected to the second branch pipe via the second distribution pipe solenoid valve 8-2, and the second branch pipe is connected to the second low-temperature storage floor 9-2; the main branch pipe is connected to the third branch pipe via the third distribution pipe solenoid valve 8-3, and the third branch pipe is connected to the third low-temperature storage floor 9-3.

[0037] The through-hall water system loop includes a through-hall supply solenoid valve, a water pump, a through-hall return pipe, a through-hall supply pipe, a chilled water tank, and a cooler. The through-hall supply solenoid valve controls whether cooling water is sent to the chilled water tank and the cooler. The water pump provides power for the cooling water. The cooler provides cooling capacity to the low-temperature through-hall. The chilled water tank stores excess cooling capacity. The through-hall return pipe and the through-hall supply pipe are connected to the cooler and the heat exchanger, respectively.

[0038] The through-hall liquid supply solenoid valve includes a first liquid supply solenoid valve 1, a second liquid supply solenoid valve 2, a third liquid supply solenoid valve 3, and a fourth liquid supply solenoid valve 4; the water pump includes a first water pump 5 and a second water pump 6.

[0039] The first liquid supply solenoid valve 1 is connected to the cold water tank and the through-hall liquid supply pipe; the second liquid supply solenoid valve 2 is connected to the cold water tank and the through-hall return liquid pipe; the third liquid supply solenoid valve 3 is connected to the through-hall return liquid pipe and the through-hall liquid supply pipe; the fourth liquid supply solenoid valve 4 is connected to the air cooler and the cold water tank; the first water pump 5 is installed on the through-hall return liquid pipe; the second water pump 6 is installed between the air cooler and the cold water tank.

[0040] This system can provide cooling for multiple low-temperature storage chambers. The floors of different low-temperature storage chambers are divided into different heating zones, and liquid supply pipes are installed in each chamber, with solenoid valves for liquid supply in each branch of the liquid supply pipes.

[0041] The system provided in Embodiment 1 of this invention determines whether the floor of each cold storage room needs heating by using temperature sensors on the floor of each cold storage room. The antifreeze circulation loop collects the cold energy from each cold storage room floor and then controls the start / stop of the main manifold through the solenoid valves of the corresponding manifold branches (if the floor antifreeze section is not needed, the solenoid valves 7-n of the corresponding loop are closed). The antifreeze is then sent to the heat exchanger to exchange heat with the chilled water. After transferring the cold energy to the chilled water, the antifreeze flows back to the main manifold and is then sent to the appropriate locations through the solenoid valves of the corresponding branch pipes. The floor of the low-temperature cold storage is protected against freezing. The chilled water that receives the cooling capacity of the antifreeze can be sent to the cold air cooler and the cold water storage tank. The system controls whether the chilled water is sent to the cold water storage tank and the cold air cooler by controlling the start and stop of the supply solenoid valves 1, 2, 3 and 4. The water pump 5 provides the power to send the cooling water to the heat exchanger after the cold air cooler has finished heat exchange. When the cooling capacity of the low-temperature cold storage floor is insufficient to provide the cooling capacity required by the low-temperature cold passage, the fourth supply solenoid valve 4 is opened and the second water pump 6 provides the power to send the cooling water in the cold air cooler to the cold water storage tank for heat exchange.

[0042] The liquid supply solenoid valve can be controlled uniformly by the refrigeration unit.

[0043] Figure 1 The diagram shows three floor levels as a schematic of zoned control for low-temperature cold storage floors. The system can achieve zoned control of multiple low-temperature cold storage floors. As the number of low-temperature cold storages increases, the area of ​​the cold storage passages also increases. As further described above, when the number of low-temperature cold storage passages increases to 9-n, the number of liquid collection pipe solenoid valves 7-n and liquid distribution pipe solenoid valves 8-n increases accordingly. The liquid collection pipe solenoid valves 7-n and liquid distribution pipe solenoid valves 8-n control the supply and return of liquid for each corresponding low-temperature cold storage floor, which belongs to the antifreeze circulation loop system. The liquid supply solenoid valves 1-4 are the passage water system loop, used to control the supply and return of water for the air cooler and the chilled water tank.

[0044] In a preferred but non-limiting embodiment of the present invention, the floor antifreeze solution circuit and the through-hall water system circuit are independent of each other and use different working fluids. The floor antifreeze solution is ethylene glycol, and the working fluid inside the through-hall water system circuit is water.

[0045] Example 2 Embodiment 2 of the present invention provides a method for controlling the cold energy of the floor of a low-temperature warehouse based on the system of Embodiment 1. According to the control flow of the low-temperature warehouse floor heating system, there are two main reference indicators for system control: the floor temperature of each low-temperature warehouse and the cooling demand of the passageway. At the same time, the control method has two operating modes: Low-temperature warehouse floor heating mode – Low-temperature warehouse floors are cold and require heating: Multiple temperature sensors are installed on the floor of each low-temperature storage facility to collect the temperature of each sensor in each low-temperature storage facility. The average temperature ti of the floor of each low-temperature storage facility is calculated, a first temperature t_S is set, and the relationship between ti and t_S is determined. If ti≤t_S, it is determined that the floor of the i-th low-temperature storage room needs heat. The solenoid valves 7-n and 8-n of the liquid collection pipe and the liquid distribution pipe corresponding to the floor of the i-th low-temperature storage room are opened. At this time, the floor antifreeze is filled into the shell side of the heat exchanger and exchanges heat with the cooling water in the heat exchanger tube. The cooling water obtains cold energy and is sent to each low-temperature passage.

[0046] In a preferred but non-limiting embodiment of the present invention, the first temperature t_S is taken as 1℃, and the average temperature of the floor is determined by the average temperature calculated by the temperature sensors at different locations of the low-temperature warehouse floor to determine whether the average floor temperature ti≤1℃. If ti≤1℃, it is determined that each floor needs heat. First, the control cabinet of the cold storage water tank sends a command that the floor needs to be heated. At this time, the solenoid valve 7-n of the liquid collection pipe and the solenoid valve 8-n of the liquid distribution pipe of the corresponding branch pipe circuit of the floor that needs to be heated and protected from freezing are opened. At this time, the floor antifreeze is filled into the shell side of the heat exchanger and exchanges heat with the cooling water in the heat exchanger tube. The cooling water obtains cold energy and is sent to the passage of each low temperature warehouse.

[0047] At this time, the start and stop of the liquid supply solenoid valves 1-4 and the second water pump 6 are controlled according to the cooling situation of the corridor: Real-time monitoring of the temperature in each low-temperature passageway to determine whether the temperature of each low-temperature passageway meets the operating requirements: 1) When the temperature of the low-temperature passageway meets the operating requirements or when no operation is required at night, control the liquid supply solenoid valve and water pump so that the passageway water system loop flows through the cold storage water tank, and the excess cold energy of the low-temperature warehouse floor is stored in the cold storage water tank.

[0048] In a preferred but non-limiting embodiment of the present invention, when the temperature of the passageway of the low-temperature warehouse meets the operating requirements or when no operation is required at night, the first liquid supply solenoid valve 1, the second liquid supply solenoid valve 2 and the third liquid supply solenoid valve 3 are activated, and the fourth liquid supply solenoid valve 4 and the second water pump 6 are closed. The cooling water in the passageway water system circuit flows through the cold storage water tank, and the excess cold energy of the low-temperature warehouse floor is stored in the cold storage water tank.

[0049] 2) When the temperature of the low-temperature passageway does not meet the requirements during operation and cooling is required, determine whether the cooling capacity provided by the low-temperature warehouse floor is sufficient for the cooling capacity required by the low-temperature passageway. If it is sufficient, control the liquid supply solenoid valve and water pump so that the air cooler provides cooling capacity to the low-temperature passageway, and at the same time, the cold storage water tank starts to store cold.

[0050] In a preferred but non-limiting embodiment of the present invention, when the temperature of the low-temperature passageway does not meet the requirements during operation and cooling is required, it is determined whether the passageway temperature meets the requirements. If the cooling capacity provided by the floor meets the cooling capacity required by the passageway, the first liquid supply solenoid valve 1 and the second liquid supply solenoid valve 2 are activated, and the third liquid supply solenoid valve 3 is closed, so that the air cooler provides cooling capacity to the low-temperature passageway, and the cold storage water tank begins to store cold.

[0051] 3) When the cooling capacity provided by the low-temperature warehouse floor is insufficient to meet the cooling capacity required by the low-temperature passageway, control the liquid supply solenoid valve and water pump so that the cooling capacity of the low-temperature warehouse floor and the cooling capacity of the cold storage water tank are supplied to the low-temperature passageway for cooling.

[0052] When the cooling capacity provided by the low-temperature storage floor is insufficient to meet the cooling requirements of the low-temperature passageway, the first liquid supply solenoid valve 1, the second liquid supply solenoid valve 2, and the third liquid supply solenoid valve 3 are closed, and the fourth liquid supply solenoid valve 4 and the second water pump 6 are started. At this time, the cooling capacity of the low-temperature storage floor and the cooling capacity of the cold water storage tank are simultaneously supplied to the passageway for cooling. Under this control logic, it can be ensured that the cooling capacity provided by the floor meets the cooling needs of the passageway.

[0053] Low-temperature warehouse floor heating off mode – Low-temperature warehouse floor heating stop command: Determine whether the floor temperature of the low-temperature warehouse meets the antifreeze requirements. If the floor temperature ti > t_S, close the solenoid valve 7-n of the liquid collection pipe and the solenoid valve 8-n of the liquid distribution pipe on the corresponding floor antifreeze solution circuit. The floor of the low-temperature warehouse will stop providing cooling. Monitor the temperature of the cold room of each floor of the low-temperature warehouse in a timely manner to determine whether the floor of the low-temperature warehouse needs to be heated. If heating is required, switch to the floor heating mode.

[0054] In a preferred but non-limiting embodiment of the present invention, it is determined whether the temperature of the low-temperature warehouse floor meets the antifreeze requirements. If the temperature of the low-temperature warehouse floor ti > 1°C, the solenoid valve 7-n of the liquid collection pipe and the solenoid valve 8-n of the liquid distribution pipe on the corresponding antifreeze solution circuit system are closed, and the low-temperature warehouse floor stops providing cooling. The temperature of the cold room of each low-temperature warehouse floor is monitored in a timely manner to determine whether the low-temperature warehouse floor needs to be heated. If heating is required, the low-temperature warehouse floor heating mode is switched.

[0055] Utilizing the cooling capacity of the low-temperature storage floor, an antifreeze solution loop is set up, which is independent of the through-hall water system loop. The supply and return of liquid to each low-temperature storage floor is controlled by connecting the distribution and collection pipes through the supply solenoid valve. After the ethylene glycol antifreeze exchanges heat with the chilled water in the heat exchanger, the cooling capacity of the floor is sent to the low-temperature through-hall for refrigeration.

[0056] By installing a cold water storage tank, cold storage can be determined based on the floor temperature of different cold rooms and the working conditions of whether the passageway needs cooling. The comprehensive collection of cold energy from the floor can ensure the cooling of the passageway, save on the corresponding passageway refrigeration system, and improve economic efficiency.

[0057] Example 3 Embodiment 3 of the present invention provides a low-temperature storage facility, including the low-temperature storage floor cooling energy recovery system of Embodiment 1.

[0058] The beneficial effects of this invention are compared with those of the prior art: (1) The temperature of the floor of the low-temperature warehouse is monitored and fed back to the refrigeration unit. The system realizes centralized recovery and utilization of the cold energy of different low-temperature warehouse floors by controlling the liquid supply solenoid valve. The recovered cold energy is supplied to the passageway for cooling. Combined with the passageway running time, the industrial solenoid valve of the passageway water system loop controls the working status of the air cooler and the cold water storage tank. This control system can save a set of refrigeration systems corresponding to the passageway.

[0059] (2) The heat source for floor antifreeze is the heat from the passageway, and the heat is not provided by the system (including the absence of heat from the cold storage maintenance structure), simplifying the system's refrigeration circulation pipeline.

[0060] (3) The solution heating floor circulation system is independent of the low temperature storage refrigeration system and the through water system. The control of the floor cooling capacity and the cold storage water tank does not involve the opening and closing of valves on the refrigeration system, so that the cold storage refrigeration and floor antifreeze can be carried out simultaneously, and the control logic is simplified.

[0061] This disclosure can be a system, method, and / or computer program product. A computer program product may include a computer-readable storage medium having computer-readable program instructions loaded thereon for causing a processor to implement various aspects of this disclosure.

[0062] Computer-readable storage media can be tangible devices capable of holding and storing instructions for use by an instruction execution device. Computer-readable storage media can be, for example—but not limited to—electrical storage devices, magnetic storage devices, optical storage devices, electromagnetic storage devices, semiconductor storage devices, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of computer-readable storage media include: portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), static random access memory (SRAM), portable compact disc read-only memory (CD-ROM), digital multifunction disc (DVD), memory sticks, floppy disks, mechanical encoding devices, such as punch cards or recessed protrusions storing instructions thereon, and any suitable combination of the foregoing. The computer-readable storage media used herein are not to be construed as transient signals themselves, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through waveguides or other transmission media (e.g., light pulses through fiber optic cables), or electrical signals transmitted through wires.

[0063] The computer-readable program instructions described herein can be downloaded from computer-readable storage media to various computing / processing devices, or downloaded via a network, such as the Internet, local area network, wide area network, and / or wireless network, to an external computer or external storage device. The network may include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers, and / or edge servers. A network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards them to the computer-readable storage media in the respective computing / processing device.

[0064] Computer program instructions used to perform the operations of this disclosure may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, status setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Smalltalk, C++, etc., and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The computer-readable program instructions may execute entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or may be connected to an external computer (e.g., via the Internet using an Internet service provider). In some embodiments, electronic circuitry, such as programmable logic circuitry, field-programmable gate arrays (FPGAs), or programmable logic arrays (PLAs), is personalized by utilizing the status information of the computer-readable program instructions to implement various aspects of this disclosure.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the protection scope of the claims of the present invention.

Claims

1. A system for recovering the cold energy of a low-temperature warehouse floor, characterized in that, include: The system includes a heat exchanger, a floor antifreeze solution circuit, and a through-hall water system circuit; the floor antifreeze solution circuit exchanges heat with the through-hall water system circuit through the heat exchanger. The antifreeze solution circuit for the floor includes an antifreeze collection pipe, an antifreeze distribution pipe, a collection pipe solenoid valve, a distribution pipe solenoid valve, and a low-temperature storage floor. The antifreeze collection pipe and the antifreeze distribution pipe are respectively connected to the low-temperature storage floor and the heat exchanger. The collection pipe solenoid valve is installed on the antifreeze collection pipe. The distribution pipe solenoid valve is installed on the antifreeze distribution pipe. The through-hall water system circuit includes a through-hall liquid supply solenoid valve, a water pump, a through-hall return pipe, a through-hall liquid supply pipe, a cold water storage tank, and a cooler. The through-hall liquid supply solenoid valve is used to control whether cooling water is sent to the cold water storage tank and the cooler. The water pump is used to provide power for the cooling water. The cooler is used to provide cooling capacity for the low-temperature through-hall. The cold water storage tank is used to store excess cooling capacity. The through-hall return pipe and the through-hall liquid supply pipe are respectively connected to the cooler and the heat exchanger.

2. The system for recovering the cold energy of a low-temperature storage floor according to claim 1, characterized in that: The antifreeze solution circuit for the floor also includes a temperature sensor, which is installed in the floor of the low-temperature storage facility to determine whether the floor of each low-temperature storage facility needs to be heated.

3. The system for recovering the cold energy of a low-temperature storage floor according to claim 1, characterized in that: The antifreeze manifold includes a main manifold and branch manifolds; The main manifold is connected to the branch manifold via the liquid collection pipe solenoid valve, and the main manifold is connected to the heat exchanger, while the branch manifold is connected to the floor of the low-temperature storage facility. The antifreeze distribution pipe includes a main branch pipe and branch pipes; The main branch pipe is connected to the branch pipe via the solenoid valve of the liquid distribution pipe, and the main branch pipe is connected to the heat exchanger, while the branch pipe is connected to the floor of the low-temperature storage room.

4. The system for recovering the cold energy of a low-temperature storage floor according to claim 3, characterized in that: The manifold branch is used to discharge the antifreeze after absorbing the cold energy of the floor of each of the low-temperature warehouses. The main manifold is used to collect the antifreeze from each of the branch manifolds and send it to the heat exchanger for heat exchange. The main branch pipe is used to receive the antifreeze after heat exchange and temperature rise; The branch pipes are used to receive the heated antifreeze from the main branch pipes and deliver it to the floors of each of the low-temperature storage facilities for heating the floors of each facility.

5. The system for recovering the cold energy of a low-temperature storage floor according to claim 3, characterized in that: The manifold branch includes a first manifold branch, a second manifold branch, and a third manifold branch; The branch lines under management include a first branch line, a second branch line, and a third branch line; The liquid collection tube solenoid valve includes a first liquid collection tube solenoid valve (7-1), a second liquid collection tube solenoid valve (7-2), and a third liquid collection tube solenoid valve (7-3). The liquid distribution tube solenoid valve includes a first liquid distribution tube solenoid valve (8-1), a second liquid distribution tube solenoid valve (8-2), and a third liquid distribution tube solenoid valve (8-3). The low-temperature storage floor includes a first low-temperature storage floor (9-1), a second low-temperature storage floor (9-2), and a third low-temperature storage floor (9-3); The main manifold is connected to the first branch manifold via the first liquid collection pipe solenoid valve (7-1), and the first branch manifold is connected to the first low-temperature storage floor (9-1); the main manifold is connected to the second branch manifold via the second liquid collection pipe solenoid valve (7-2), and the second branch manifold is connected to the second low-temperature storage floor (9-2); the main manifold is connected to the third branch manifold via the third liquid collection pipe solenoid valve (7-3), and the third branch manifold is connected to the third low-temperature storage floor (9-3). The main branch pipe is connected to the first branch pipe via the first liquid distribution pipe solenoid valve (8-1), and the first branch pipe is connected to the first low-temperature storage floor (9-1); the main branch pipe is connected to the second branch pipe via the second liquid distribution pipe solenoid valve (8-2), and the second branch pipe is connected to the second low-temperature storage floor (9-2); the main branch pipe is connected to the third branch pipe via the third liquid distribution pipe solenoid valve (8-3), and the third branch pipe is connected to the third low-temperature storage floor (9-3).

6. The system for recovering the cold energy of a low-temperature storage floor according to claim 1, characterized in that: The through-hall liquid supply solenoid valve includes a first liquid supply solenoid valve (1), a second liquid supply solenoid valve (2), a third liquid supply solenoid valve (3), and a fourth liquid supply solenoid valve (4). The water pumps include a first water pump (5) and a second water pump (6); The first liquid supply solenoid valve (1) is connected to the cold water storage tank and the through-hall liquid supply pipe; the second liquid supply solenoid valve (2) is connected to the cold water storage tank and the through-hall return liquid pipe; the third liquid supply solenoid valve (3) is connected to the through-hall return liquid pipe and the through-hall liquid supply pipe; the fourth liquid supply solenoid valve (4) is connected to the air cooler and the cold water storage tank; the first water pump (5) is installed on the through-hall return liquid pipe; the second water pump (6) is installed between the air cooler and the cold water storage tank.

7. A low-temperature storage facility, characterized in that, include: The system for recovering the cold energy of the floor of a low-temperature storage facility as described in any one of claims 1-6.

8. A method for controlling the cooling capacity of a low-temperature warehouse floor cooling capacity recovery system according to any one of claims 1-6, characterized in that, include: Low-temperature warehouse floor heating mode: Collect the temperature of each temperature sensing bulb in each low-temperature warehouse, calculate the average temperature ti of the floor of each low-temperature warehouse, set the first temperature t_S, and determine the relationship between ti and t_S; If ti≤t_S, open the solenoid valves of the liquid collection pipe and the liquid distribution pipe corresponding to the i-th low-temperature storage floor, fill the floor antifreeze on the heat exchanger shell side, exchange heat with the cooling water in the heat exchanger tube, and send the cooling water to each low-temperature passageway after obtaining the cold energy. Real-time monitoring of the temperature of each low-temperature passageway to determine whether the temperature of each low-temperature passageway meets the operating requirements; When the temperature of the low-temperature passageway meets the operating requirements or when no operation is required at night, control the liquid supply solenoid valve and water pump so that the passageway water system loop flows through the cold storage tank, and the excess cold energy of the low-temperature warehouse floor is stored in the cold storage tank. When the temperature of the low-temperature passageway does not meet the requirements during operation and cooling is required, it is determined whether the cooling capacity provided by the low-temperature warehouse floor is sufficient for the cooling capacity required by the low-temperature passageway. If it is sufficient, the liquid supply solenoid valve and water pump are controlled so that the air cooler provides cooling capacity to the low-temperature passageway, and the cold storage water tank starts to store cold. When the cooling capacity provided by the low-temperature warehouse floor is insufficient to meet the cooling capacity required by the low-temperature passageway, the liquid supply solenoid valve and water pump are controlled to supply the cooling capacity of the low-temperature warehouse floor and the cooling capacity of the cold storage water tank to the low-temperature passageway for cooling.

9. The cooling capacity control method according to claim 8, characterized in that: This also includes a non-heating mode for the floor of low-temperature warehouses; Determine whether the floor temperature of the low-temperature warehouse meets the antifreeze requirements. If t > _S, close the solenoid valves of the collection pipe and the distribution pipe on the corresponding floor antifreeze solution circuit, and the low-temperature warehouse floor will stop providing cooling. The temperature of the floor in each low-temperature warehouse is monitored in real time to determine whether the floor needs to be heated. If heating is required, the system switches to the low-temperature warehouse floor heating mode.

10. A terminal, comprising a processor and a storage medium; characterized in that: The storage medium is used to store instructions; The processor is configured to operate according to the instructions to perform the steps of the method according to any one of claims 8-9.

11. A computer-readable storage medium having a computer program stored thereon, characterized in that, When executed by a processor, the program implements the steps of the method according to any one of claims 8-9.

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