Method for calculating operation energy efficiency of energy bus hybrid energy supply system based on waste heat recovery

Abstract

This invention provides a method for calculating the operating energy efficiency of an energy bus-based hybrid energy supply system based on waste heat recovery, comprising: constructing an energy bus system, monitoring and acquiring the total heat release from waste heat sources. Q z Heat extraction with water source heat pump system Q s ;like Q z < Q s In this case, the heat storage system will prioritize supplementing the energy bus with heat; if insufficient, the air source heat pump system will be activated to supplement the heat, and the supplemented energy bus will then supply heat to the water source heat pump system; if Q z = Q s Then, the cooling tower, heat storage system, and air source heat pump system will be shut down, and the water source heat pump system will directly utilize waste heat for heating; if Q z > Q s After the water source heat pump system has taken heat, the remaining heat is stored in the heat storage system first. If there is still a surplus, the cooling tower is started to release the excess heat. Based on the heat released by the waste heat source, the heat supplied by the water source heat pump, and the energy consumed by each system, the comprehensive energy efficiency value Φ of the system is calculated. The comprehensive energy efficiency value is the ratio of the total energy supplied by the system to the total energy consumed, which effectively improves the energy utilization rate.

Description

Technical Field

[0001] This invention relates to the field of energy utilization technology, and in particular to a method for calculating the operating energy efficiency of an energy bus composite energy supply system based on waste heat recovery. Background Technology

[0002] In industries such as petrochemicals, building materials, telecommunications, and power, low-grade waste heat generated during production is often directly discharged through cooling towers or treated by artificial refrigeration, resulting in energy waste. While some waste heat recovery systems exist, their operational strategies are simplistic, lacking intelligent control methods for dynamically matching waste heat with heat demand. This leads to inaccurate system energy efficiency assessments, insufficient cascaded energy utilization, and difficulty in maximizing the use of waste heat resources. Summary of the Invention

[0003] This invention provides a method for calculating the operating energy efficiency of an energy bus composite power supply system based on waste heat recovery, in order to solve the problem of low energy utilization efficiency in the prior art.

[0004] In a first aspect, the present invention provides a method for calculating the operating energy efficiency of an energy bus composite energy supply system based on waste heat recovery, comprising: Construct an energy bus system, including at least one waste heat source, cooling tower, heat storage system, air source heat pump system, water source heat pump system, heat users, and the energy bus connecting each part; Monitor and obtain the total heat released by waste heat sources Q z Heat extraction with water source heat pump system Q s ; according to Q z and Q s Based on the size relationship, execute the corresponding running strategy: like Q z < Q s If the heat storage system is insufficient, the energy bus will be heated first. If the heat storage system is insufficient, the air source heat pump system will be activated to supplement the heat. The energy bus after supplementing the heat will then supply heat to the water source heat pump system. like Q z = Q s If the cooling tower, heat storage system and air source heat pump system are shut down, the water source heat pump system will directly use waste heat for heating. like Q z > Q s, after the heat extraction of the water source heat pump system is satisfied, the remaining heat is preferentially stored in the heat storage system. If there is still a surplus, the cooling tower is started to discharge the excess heat; Based on the heat release amount of the waste heat source, the heat supply amount of the water source heat pump, and the energy consumption of each system, calculate the comprehensive energy efficiency value Φ of the system. The comprehensive energy efficiency value is the ratio of the total energy supply amount to the total energy consumption amount of the system.

[0005] According to a method for calculating the operating energy efficiency of an energy bus composite energy supply system based on waste heat recovery provided by the present invention, the operating strategy further includes: Real-time monitor the heat amounts Q1(t), Q2(t), …, Qn(t) released by each of the waste heat sources to the energy bus; Real-time monitor the heat extraction Qs(t) of the water source heat pump system from the energy bus; Calculate the real-time total waste heat release amount ; According to the magnitude relationship between Qz(t) and Qs(t), automatically execute the corresponding heating, heat storage, heat supplement or heat discharge operation modes.

[0006] According to a method for calculating the operating energy efficiency of an energy bus composite energy supply system based on waste heat recovery provided by the present invention, the automatically executing the corresponding heating, heat storage, heat supplement or heat discharge operation modes includes: When Qz(t) < Qs(t), start the heat storage system to release heat. If the heat release amount is still insufficient, start the air source heat pump system to supplement heat, and transport the heat of the energy bus after heat supplement to the water source heat pump system; When Qz(t) = Qs(t), turn off the cooling tower, the heat storage system and the air source heat pump system, and only directly couple and operate the waste heat source and the water source heat pump system; When Qz(t) > Qs(t), store the excess heat in the heat storage system. If the heat storage system is full or unavailable, start the cooling tower to dissipate heat.

[0007] According to a method for calculating the operating energy efficiency of an energy bus composite energy supply system based on waste heat recovery provided by the present invention, the storing the excess heat in the heat storage system includes: Real-time monitor the current heat storage capacity and heat storage rate of the heat storage system; According to the magnitude of the excess heat and the capacity of the heat storage system, dynamically adjust the heat transfer flow rate from the energy bus to the heat storage system; During the heat storage process, if it is monitored that the heat extraction amount of the water source heat pump system increases and causes a change in the relationship between Qz(t) and Qs(t), interrupt the heat storage and ensure heating.

[0008] According to a method for calculating the operating energy efficiency of an energy bus composite energy supply system based on waste heat recovery provided by the present invention, the calculating the comprehensive energy efficiency value Φ of the system includes: Collect annual operation data, including heat release sequences Qi(t) from each waste heat source, heat supply sequences Qh(t) from water source heat pumps, and energy consumption sequences Wj(t) from each system; The total annual heat release, total annual heat supply, and total annual energy consumption are obtained by summing the annual operating data over time. The total annual heat release and the total annual heat supply are added together to obtain the total system energy supply, and the total energy consumption of each system is added together to obtain the total system energy consumption. Calculate the ratio of the total energy supplied by the system to the total energy consumed by the system to obtain the system's comprehensive energy efficiency value Φ for the whole year.

[0009] According to the present invention, an energy efficiency calculation method for an energy bus composite energy supply system based on waste heat recovery is provided, which involves summing the annual operating data over time to obtain the total annual heat release, total annual heat supply, and total annual energy consumption, including: The hourly heat release Qi(t) from waste heat source 1 to waste heat source n is accumulated annually to obtain the total annual heat release. The total annual heat supply is obtained by accumulating the hourly heat supply Qh(t) of the water source heat pump over the year. The hourly energy consumption of waste heat sources, water source heat pumps, air source heat pumps, heat storage systems, and cooling towers is accumulated annually to obtain their respective total annual energy consumption.

[0010] According to the present invention, a method for calculating the operating energy efficiency of an energy bus composite power supply system based on waste heat recovery, after obtaining the system's annual comprehensive energy efficiency value Φ, further includes: The calculated Φ value is compared with the preset energy efficiency benchmark value; If the Φ value is lower than the preset benchmark, the energy consumption ratio of each subsystem is analyzed, the operating parameters of the corresponding subsystem are adjusted, and the energy efficiency is retested and optimized in the next operating cycle.

[0011] The energy efficiency calculation method for an energy bus composite power supply system based on waste heat recovery provided by the present invention further includes: The current operating condition category is determined based on the total amount of waste heat, the demand of heat users, and the status of the heat storage system; By controlling the opening and closing of valves and the start and stop of equipment on the energy bus, the system can be switched to the corresponding heating, heat storage or cooling mode. Under complex operating conditions, multiple subsystems are coordinated to operate simultaneously or sequentially, enabling the cascade utilization of energy.

[0012] The energy efficiency calculation method for an energy bus composite power supply system based on waste heat recovery provided by the present invention further includes: Identify the types of low-grade waste heat sources within the plant area, including at least one of the following: air compressor heat dissipation, frequency converter heat dissipation, lithium battery pack heat dissipation, and data cabinet heat dissipation; Different types of waste heat sources are equipped with corresponding heat exchange and transmission devices, connected to the energy bus, and allocated priority utilization level and recovery ratio in the energy bus according to the characteristics and emission patterns of the waste heat sources.

[0013] Secondly, the present invention provides an energy efficiency calculation system for an energy bus composite power supply system based on waste heat recovery, comprising: The building module is used to build an energy bus system, including at least one waste heat source, cooling tower, heat storage system, air source heat pump system, water source heat pump system, heat users, and energy bus connecting the various parts. The monitoring module is used to monitor and acquire the total heat released by the waste heat source. Q z Heat extraction with water source heat pump system Q s ; Execution module, used to determine Q z and Q s Based on the size relationship, execute the corresponding running strategy: if Q z < Q s In this case, the heat storage system will prioritize supplementing the energy bus with heat; if insufficient, the air source heat pump system will be activated to supplement the heat, and the supplemented energy bus will then supply heat to the water source heat pump system; if Q z = Q s Then, the cooling tower, heat storage system, and air source heat pump system will be shut down, and the water source heat pump system will directly utilize waste heat for heating; if Q z > Q s After the water source heat pump system has satisfied its heat extraction needs, the remaining heat is stored in the heat storage system first. If there is still a surplus, the cooling tower is started to release the excess heat. The calculation module is used to calculate the overall energy efficiency value Φ of the system based on the heat released by the waste heat source, the heat supplied by the water source heat pump, and the energy consumed by each system. The overall energy efficiency value is the ratio of the total energy supplied by the system to the total energy consumed.

[0014] Thirdly, the present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the energy efficiency calculation method for the energy bus composite energy supply system based on waste heat recovery as described above.

[0015] Fourthly, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the energy efficiency calculation method for the energy bus composite energy supply system based on waste heat recovery as described above.

[0016] Fifthly, the present invention also provides a computer program product, including a computer program that, when executed by a processor, implements the energy efficiency calculation method for the energy bus composite energy supply system based on waste heat recovery as described above.

[0017] This invention dynamically determines the relationship between the heat released by the waste heat source and the heat taken by the water source heat pump system, and intelligently switches between heat storage, heat replenishment, heat storage or heat exhaust modes. This achieves precise matching and tiered utilization of waste heat and energy supply, significantly improving the overall energy efficiency of the system. At the same time, by establishing a comprehensive energy efficiency calculation model, it provides a means to quantitatively evaluate the energy-saving effect of the system, which is conducive to the optimized operation and promotion of the system, and has significant energy-saving and environmental protection benefits. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a flowchart illustrating the energy efficiency calculation method for the energy bus composite energy supply system based on waste heat recovery provided in this embodiment. Figure 2 This is a schematic diagram of the composite energy supply system provided in this embodiment; Figure 3 This is a schematic diagram of the energy efficiency calculation system for the energy bus composite energy supply system based on waste heat recovery provided in this embodiment; Figure 4 This is a schematic diagram of the structure of the electronic device provided in this embodiment. Detailed Implementation

[0020] 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. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0021] Figure 1This is a flowchart illustrating the energy efficiency calculation method for the energy bus composite energy supply system based on waste heat recovery provided in this embodiment. Figure 2 This is a schematic diagram of the composite energy supply system provided in this embodiment.

[0022] like Figure 1 As shown in the figure, the energy efficiency calculation method for the energy bus composite energy supply system based on waste heat recovery provided in this embodiment of the invention mainly includes the following steps: 101. Construct an energy bus system, including at least one waste heat source, cooling tower, heat storage system, air source heat pump system, water source heat pump system, heat users, and the energy bus connecting each part.

[0023] Specifically, the construction is as follows Figure 2 The energy bus composite energy supply system shown includes at least one low-grade waste heat source, a cooling tower, a thermal storage system, an air source heat pump system, a water source heat pump system, heat users for heating hot water and domestic hot water supply, and an energy bus connecting all components. The waste heat provided by the waste heat source to the energy bus is equivalent to the cooling capacity required by the waste heat source itself. Low-grade waste heat sources can include common industrial types such as air compressor cooling, inverter cooling, lithium battery pack cooling, and data cabinet cooling.

[0024] The energy bus connects to all waste heat sources, cooling towers, thermal storage systems, air source heat pump systems, and water source heat pump systems via pipes equipped with control valves. The output of the water source heat pump system is directly connected to the heat user, forming an energy transmission loop. A central controller and temperature, flow, and energy consumption sensors are deployed at the inlet and outlet of each component and on the main energy bus pipe to achieve parameter acquisition and command issuance.

[0025] By rapidly building a hardware framework that meets the needs of waste heat recovery and composite energy supply, adapting to the types of low-grade industrial waste heat and heating scenarios, a foundation is provided for subsequent dynamic regulation.

[0026] 102. Monitor and obtain the total heat release from waste heat sources. Q z Heat extraction with water source heat pump system Q s .

[0027] Specifically, after the system starts, the sensors collect the following data in real time, which is then processed by the central controller. The heat released hourly by each waste heat source at time t is Qi(t) (i=1,2,…,n), and the total real-time waste heat release is calculated. , the hourly heat extraction Qs(t) of the water source heat pump system at time t, the hourly heat supply Qh(t) to heat users, the hourly energy consumption Wj(t) of each system, where j corresponds to the waste heat source transmission system, water source heat pump system, air source heat pump system, heat storage system, cooling tower, the current heat storage capacity, heat storage rate and maximum heat storage / heat release capacity of the heat storage system.

[0028] By real-time monitoring of various data, it provides real-time data support for the dynamic operation strategy to ensure accurate judgment of supply-demand matching.

[0029] 103. According to Q z and Q s of the size relationship, execute the corresponding operation strategy.

[0030] Specifically, taking the size relationship between the real-time total waste heat release Qz(t) and the heat extraction Qs(t) of the water source heat pump as the core control criterion, all operations are automatically executed by the central controller without manual intervention, mainly including three operation modes, as follows: 1031. If Q z < Q s , then the heat storage system is preferentially used to supplement heat to the energy bus. When insufficient, the air source heat pump system is started to supplement heat, and after heat supplement, the energy bus supplies heat to the water source heat pump system.

[0031] If Q z < Q s (that is, Qz(t) < Qs(t), the two have the same meaning, t only indicates the specific value corresponding to time t, the same below, no longer explained one by one) indicates insufficient waste heat supply, then the heat storage system is preferentially started to release heat: the central controller sends a heat release instruction to the heat storage system, and the heat release rate is dynamically adjusted according to the heat gap ΔQ(t) = Qs(t) - Qz(t) to ensure maximum utilization of the stored heat and reduce additional energy consumption. If the heat storage system still cannot meet Qz(t) + Qx heat release(t) < Qs(t) after heat release, the air source heat pump system is immediately started to supplement heat to the energy bus, and the heat supplement rate is adapted to the remaining gap in real time. Finally, the composite heat of waste heat + heat storage system heat release + air source heat pump heat supplement is stably transported to the water source heat pump system through the energy bus to ensure the heating and domestic hot water needs of heat users.

[0032] 1032. If Q z = Q s , then stop the cooling tower, heat storage system and air source heat pump system, and the water source heat pump system directly uses waste heat for heating.

[0033] IfQ z = Q s (i.e., Qz(t)=Qs(t)), indicating that the waste heat supply and demand are matched. Then the central controller directly issues a shutdown command to shut down the operation of the cooling tower, heat storage system and air source heat pump system and the corresponding valves, and only retains the waste heat source and water source heat pump system to operate directly coupled. The heat released by the waste heat source is directly connected to the water source heat pump system through the energy bus to achieve energy utilization without loss.

[0034] 1033. If Q z > Q s After the water source heat pump system has satisfied its heat extraction needs, the remaining heat is prioritized for storage in the heat storage system. If there is still a surplus, the cooling tower is activated to release the excess heat.

[0035] like Q z > Q s (i.e., Qz(t) > Qs(t)), indicating a surplus of waste heat supply. The central controller first determines the status of the thermal storage system. If the current storage capacity is below its limit, it dynamically adjusts the heat transfer flow from the energy bus to the thermal storage system based on the surplus heat (ΔQ(t) = Qz(t) - Qs(t)) and the storage rate of the thermal storage system, maximizing the storage of excess waste heat. During thermal storage, if an increase in the heat output Qs(t) of the water source heat pump is detected, causing Qz(t) ≤ Qs(t), the thermal storage operation is immediately interrupted, the heat transfer valve of the thermal storage system is closed, priority is given to ensuring the heat output demand of the water source heat pump, and then the system switches to the corresponding operating mode. If the thermal storage system reaches its limit or becomes unavailable, the cooling tower is activated, receiving the remaining waste heat through the energy bus and discharging it directly into the air to avoid waste heat or system overload.

[0036] By employing a dynamic strategy that prioritizes heat storage, provides supplementary heat as a backup, and combines storage and discharge, we can achieve a precise match between waste heat supply and heat extraction demand. This addresses the issues of existing technologies having a single operational strategy and insufficient cascade utilization, thereby maximizing the value of low-grade waste heat.

[0037] 104. Based on the heat released by the waste heat source, the heat supplied by the water source heat pump, and the energy consumed by each system, calculate the comprehensive energy efficiency value Φ of the system. The comprehensive energy efficiency value is the ratio of the total energy supplied to the total energy consumed by the system.

[0038] Specifically, using the annual operating time T of the composite energy supply system as the statistical period, hourly operating data is continuously collected throughout the year, including: The hourly heat release sequence Qi(t) of each waste heat source (i=1,2,…,n; t=1,2,…,T, where n is the number of waste heat sources and t is the hourly time node). The hourly heat supply sequence Qh(t) of the water source heat pump system; The hourly energy consumption sequence Wj(t) of each system (j corresponds to the waste heat source transportation system, water source heat pump system, air source heat pump system, heat storage system, and cooling tower, respectively).

[0039] 1) Cumulative heat release per hour from each waste heat source throughout the year: The annual heat release of a single waste heat source i is: ; 2) Total annual heat release, i.e., the total amount of energy released to the energy bus from all waste heat sources throughout the year: Qz, year-round = ; 3) Total annual heat supply, i.e., the total amount of energy supplied to heat users by the water source heat pump system throughout the year: Qh, year-round =

[0040] 4) Total annual energy consumption of each system: Waste heat source transmission system: Wz, year-round = , Energy consumption per hour for a single waste heat source i; Water source heat pump system: Ws, year-round = ; Air source heat pump system: Wk, year-round = ; Thermal storage system: Wx, year-round = ; Cooling tower: WL, year-round = ; 5) Total system energy supply: Q_total energy supply = Qz, annually + Qh, annually; 6) Total system energy consumption: Total energy consumption W = Wz, annually + Ws, annually + Wk, annually + Wx, annually + WL, annually.

[0041] The system's annual comprehensive energy efficiency value Φ is the ratio of total energy supply to total energy consumption, that is: .

[0042] Then, a preset energy efficiency benchmark value Φ0 can be set based on the advanced level of similar systems in the industry or design goals, and the calculated results Φ and Φ0 can be compared: If Φ≥Φ0, maintain the current operating parameters of each subsystem; If Φ < Φ0, analyze the proportion of energy consumed by each subsystem to the total energy consumption. For subsystems with excessively high proportions, adjust the operating parameters, such as increasing the heat replenishment start-up threshold and optimizing the heat storage / release rate. After adjustment, enter the next operating cycle and repeat the data acquisition, energy efficiency calculation and comparison optimization steps until Φ ≥ Φ0 and stable operation is achieved.

[0043] By quantifying energy efficiency calculations, the energy-saving effect of the system can be intuitively reflected. Through closed-loop optimization, the energy-saving effect of the system can be continuously improved, thus solving the problem of inaccurate energy efficiency assessment in existing technologies.

[0044] Furthermore, based on the above embodiments, this embodiment also includes: determining the current operating condition category according to the total amount of waste heat, heat user demand, and the status of the heat storage system; switching the system to the corresponding heating, heat storage, or cooling condition by controlling the opening and closing of valves and the start and stop of equipment on the energy bus; coordinating the simultaneous or sequential operation of multiple subsystems under combined operating conditions to achieve cascaded utilization of energy. Identifying the types of low-grade waste heat sources within the plant area, including at least one of air compressor heat dissipation, inverter heat dissipation, lithium battery pack heat dissipation, and data cabinet heat dissipation; configuring corresponding heat exchange and conveying devices for different types of waste heat sources, connecting them to the energy bus, and allocating priority utilization levels and recovery ratios on the energy bus according to the characteristics and emission patterns of the waste heat sources.

[0045] Specifically, the central controller automatically determines the operating condition based on real-time Qz(t), heat user demand (reflected by Qh(t)), and the status of the thermal storage system. The heating mode primarily meets the heating / domestic hot water needs of heat users and supplements heat shortages; the thermal storage mode has surplus waste heat that the thermal storage system can store; the cooling mode has excessive waste heat surplus and the thermal storage system is full; and the composite mode simultaneously addresses multiple needs, including heating and thermal storage, as well as supplementary heating and heating.

[0046] By controlling the opening and closing of energy bus valves and the start and stop of equipment, the operating conditions are switched. Under complex operating conditions, the priority of heating over heat storage and heat storage over cooling is followed, and multiple subsystems are coordinated to operate simultaneously or sequentially to achieve cascaded utilization of energy.

[0047] A comprehensive investigation of low-grade waste heat sources within the plant area was conducted, identifying their type (air compressors, frequency converters, lithium battery packs, data cabinet heat dissipation, etc.), heat release temperature range, heat release stability (continuous / intermittent), and maximum heat release. Heat exchange and conveying devices were selected based on the characteristics of the waste heat source; for example, plate heat exchangers were used for high-temperature waste heat sources, and variable flow conveying devices were used for intermittent waste heat sources. Waste heat sources with high heat release temperatures and strong stability were designated as primary priority sources for maximum recovery, while those with low heat release temperatures and poor stability were designated as secondary priority sources for flexible adjustment of the recovery ratio. By controlling the flow rate of the conveying devices, the preset recovery ratios for each waste heat source were achieved: primary priority sources ≥90%, secondary priority sources 50%-80%.

[0048] By adapting to the characteristics of different types of low-grade waste heat, the problem of insufficient targeting of existing waste heat recovery technologies is solved, and the utilization rate of waste heat resources is further improved.

[0049] Figure 3 This is a schematic diagram of the energy efficiency calculation system for the energy bus composite energy supply system based on waste heat recovery provided in this embodiment.

[0050] like Figure 3 As shown in the figure, this embodiment provides an energy efficiency calculation system for an energy bus composite power supply system based on waste heat recovery, comprising: Module 301 is used to build an energy bus system, including at least one waste heat source, cooling tower, heat storage system, air source heat pump system, water source heat pump system, heat users, and energy bus connecting the various parts. Monitoring module 302 is used to monitor and acquire the total heat released by the waste heat source. Q z Heat extraction with water source heat pump system Q s ; Execution module 303, used to... Q z and Q s Based on the size relationship, execute the corresponding running strategy: if Q z < Q s In this case, the heat storage system will prioritize supplementing the energy bus with heat; if insufficient, the air source heat pump system will be activated to supplement the heat, and the supplemented energy bus will then supply heat to the water source heat pump system; if Q z = Q s Then, the cooling tower, heat storage system, and air source heat pump system will be shut down, and the water source heat pump system will directly utilize waste heat for heating; if Q z > Q s After the water source heat pump system has satisfied its heat extraction needs, the remaining heat is stored in the heat storage system first. If there is still a surplus, the cooling tower is started to release the excess heat. The calculation module 304 is used to calculate the comprehensive energy efficiency value Φ of the system based on the heat released by the waste heat source, the heat supplied by the water source heat pump, and the energy consumed by each system. The comprehensive energy efficiency value is the ratio of the total energy supplied by the system to the total energy consumed.

[0051] Figure 4 This is a schematic diagram of the structure of the electronic device provided in this embodiment.

[0052] like Figure 4 As shown, the electronic device may include a processor 401, a communication interface 402, a memory 403, and a communication bus 404. The processor 401, communication interface 402, and memory 403 communicate with each other via the communication bus 404. The processor 401 can call logic instructions from the memory 403 to execute an energy efficiency calculation method for the energy bus-based composite energy supply system based on waste heat recovery.

[0053] Furthermore, the logical instructions in the aforementioned memory 403 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0054] On the other hand, the present invention also provides a computer program product, which includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer is able to execute the energy efficiency calculation method for the energy bus composite energy supply system based on waste heat recovery provided by the above methods.

[0055] In another aspect, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the energy efficiency calculation method for the energy bus composite power supply system based on waste heat recovery provided by the above methods.

[0056] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0057] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0058] 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 them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for calculating the operating energy efficiency of an energy bus composite power supply system based on waste heat recovery, characterized in that, including: Construct an energy bus system, including at least one waste heat source, a cooling tower, a heat storage system, an air source heat pump system, a water source heat pump system, heat users, and an energy bus connecting all parts; Monitor and obtain the total heat released by waste heat sources Q z Heat extraction with water source heat pump system Q s ; according to Q z and Q s Based on the size relationship, execute the corresponding running strategy: like Q z < Q s If the heat storage system is insufficient, the energy bus will be heated first. If the heat storage system is insufficient, the air source heat pump system will be activated to supplement the heat. The energy bus after supplementing the heat will then supply heat to the water source heat pump system. like Q z = Q s If the cooling tower, heat storage system and air source heat pump system are shut down, the water source heat pump system will directly use waste heat for heating. like Q z > Q s After the water source heat pump system has satisfied its heat extraction needs, the remaining heat is stored in the heat storage system first. If there is still a surplus, the cooling tower is started to release the excess heat. Based on the heat release of the waste heat source, the heat supply of the water source heat pump, and the energy consumption of each system, calculate the comprehensive energy efficiency value Φ of the system, where the comprehensive energy efficiency value is the ratio of the total energy supply of the system to the total energy consumption.

2. The method according to claim 1, characterized in that, The operation strategy further includes: Real-time monitor the heat Q1(t), Q2(t), …, Qn(t) released by each of the waste heat sources to the energy bus; Real-time monitor the heat Qs(t) taken by the water source heat pump system from the energy bus; Calculate the total heat release of waste heat in real time ; According to the magnitude relationship between Qz(t) and Qs(t), automatically execute the corresponding heating, heat storage, heat supplement, or heat discharge operation mode.

3. The method according to claim 2, characterized in that, The automatically executing the corresponding heating, heat storage, heat supplement, or heat discharge operation mode includes: When Qz(t) < Qs(t), start the heat release of the heat storage system. If the heat release is still insufficient, start the air source heat pump system to supplement heat, and transport the heat of the energy bus after heat supplement to the water source heat pump system; When Qz(t) = Qs(t), shut down the cooling tower, the heat storage system, and the air source heat pump system, and only directly couple and operate the waste heat source and the water source heat pump system; When Qz(t) > Qs(t), store the excess heat in the heat storage system. If the heat storage system is full or unavailable, start the cooling tower to dissipate heat.

4. The method according to claim 3, characterized in that, The storing the excess heat in the heat storage system includes: Real-time monitor the current heat storage capacity and heat storage rate of the heat storage system; According to the magnitude of the excess heat and the capacity of the heat storage system, dynamically adjust the heat transfer flow rate from the energy bus to the heat storage system; During the heat storage process, if it is monitored that the heat extraction of the water source heat pump system increases, resulting in a change in the relationship between Qz(t) and Qs(t), interrupt the heat storage and ensure heating.

5. The method according to claim 1, characterized in that, The calculating the comprehensive energy efficiency value Φ of the system includes: Collect the annual operation data, including the heat release sequence Qi(t) of each waste heat source, the heat supply sequence Qh(t) of the water source heat pump, and the energy consumption sequence Wj(t) of each system; Perform time cumulative summation on the annual operation data to obtain the total annual heat release, the total annual heat supply, and the total annual energy consumption respectively; Add the total annual heat release and the total annual heat supply as the total energy supply of the system, and add the total energy consumption of each system as the total energy consumption of the system; Calculate the ratio of the total energy supply of the system to the total energy consumption of the system to obtain the annual comprehensive energy efficiency value Φ of the system.

6. The method according to claim 5, characterized in that, Performing time cumulative summation on the annual operation data to obtain the total annual heat release, the total annual heat supply, and the total annual energy consumption respectively includes: Cumulatively sum the hourly heat release Qi(t) of waste heat source 1 to waste heat source n by year to obtain the total annual heat release; Cumulatively sum the hourly heat supply Qh(t) of the water source heat pump by year to obtain the total annual heat supply; Cumulatively sum the hourly energy consumption of the waste heat source, the water source heat pump, the air source heat pump, the heat storage system, and the cooling tower by year to obtain their respective total annual energy consumption.

7. The method according to claim 5, characterized in that, After obtaining the annual comprehensive energy efficiency value Φ of the system, it further includes: Compare the calculated Φ value with the preset energy efficiency benchmark value; If the Φ value is lower than the preset benchmark, the energy consumption ratio of each subsystem is analyzed, the operating parameters of the corresponding subsystem are adjusted, and the energy efficiency is retested and optimized in the next operating cycle.

8. The method according to any one of claims 1-7, characterized in that, Also includes: The current operating condition category is determined based on the total amount of waste heat, the demand of heat users, and the status of the heat storage system; By controlling the opening and closing of valves and the start and stop of equipment on the energy bus, the system can be switched to the corresponding heating, heat storage or cooling mode. Under complex operating conditions, multiple subsystems are coordinated to operate simultaneously or sequentially, enabling the cascade utilization of energy.

9. The method according to any one of claims 1-7, characterized in that, Also includes: Identify the types of low-grade waste heat sources within the plant area, including at least one of the following: air compressor heat dissipation, frequency converter heat dissipation, lithium battery pack heat dissipation, and data cabinet heat dissipation; Different types of waste heat sources are equipped with corresponding heat exchange and transmission devices, connected to the energy bus, and allocated priority utilization level and recovery ratio in the energy bus according to the characteristics and emission patterns of the waste heat sources.

10. An energy efficiency calculation system for an energy bus composite power supply system based on waste heat recovery, characterized in that, include: The building module is used to build an energy bus system, including at least one waste heat source, cooling tower, heat storage system, air source heat pump system, water source heat pump system, heat users, and energy bus connecting the various parts. The monitoring module is used to monitor and acquire the total heat released by the waste heat source. Q z Heat extraction with water source heat pump system Q s ; Execution module, used to determine Q z and Q s Based on the size relationship, execute the corresponding running strategy: if Q z < Q s In this case, the heat storage system will prioritize supplementing the energy bus with heat; if insufficient, the air source heat pump system will be activated to supplement the heat, and the supplemented energy bus will then supply heat to the water source heat pump system; if Q z = Q s Then, the cooling tower, heat storage system, and air source heat pump system will be shut down, and the water source heat pump system will directly utilize waste heat for heating; if Q z > Q s After the water source heat pump system has satisfied its heat extraction needs, the remaining heat is stored in the heat storage system first. If there is still a surplus, the cooling tower is started to release the excess heat. The calculation module is used to calculate the overall energy efficiency value Φ of the system based on the heat released by the waste heat source, the heat supplied by the water source heat pump, and the energy consumed by each system. The overall energy efficiency value is the ratio of the total energy supplied by the system to the total energy consumed.

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