Integrated ice storage function of ground source heat pump composite energy system

Abstract

The application discloses a kind of integrated ice storage function ground source heat pump composite energy systems, including ground source heat exchange module;Ice storage module includes ice storage tank, ice melting heat exchanger, cold storage circulating pump, cold release circulating pump;Heat pump host module adopts double working condition unit, can output different temperature cold water or hot water according to demand;Intelligent control module is electrically connected with ground source heat exchange module, ice storage module and heat pump host module respectively;The intelligent control module passes through sensor and controller, real-time monitoring building load, power grid peak valley period, soil temperature, ice storage quantity and the like parameter;The application has the advantages that dust collection ground source heat pump and ice storage, realize summer cooling and winter heating dual function, solve the problem that ice storage system cannot supply heat;Utilize peak-valley electricity price difference, ice storage is made at low valley electricity price, high peak electricity price is preferentially used to melt ice cooling, reduce operating cost, ground source heat pump host and double working condition refrigerating unit can be switched, improve the flexibility of system under different load conditions.

Description

Technical Field

[0001] This invention relates to the field of ground source heat pump technology, specifically a ground source heat pump composite energy system integrating ice storage function. Background Technology

[0002] A ground source heat pump is a highly efficient, energy-saving, and environmentally friendly air conditioning system that utilizes shallow geothermal resources for both heating and cooling. By inputting a small amount of high-grade energy (electricity), a ground source heat pump can transfer energy from a low-temperature heat source to a high-temperature heat source. In winter, it extracts heat from the soil, raises its temperature, and supplies it to the interior for heating; in summer, it extracts heat from the interior and releases it back into the soil, maintaining a balanced underground temperature year-round. Currently, ground source heat pump technology is very mature in North America and Europe and is a widely used heating and air conditioning system.

[0003] Ice storage devices can be used to balance the peak and valley differences in the power grid, storing cold during off-peak hours at night and releasing it during peak hours, making it the best way for the power sector to "shave peaks and fill valleys." Both of these new technologies have their limitations. While ground source heat pump technology can provide heating and cooling, it cannot store cold during off-peak hours at night to achieve peak shaving and valley filling. Ice storage devices, while effective at peak shaving and valley filling, cannot provide heating in winter.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the overall background of the invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0005] The technical problem this invention aims to solve is to overcome the aforementioned technical deficiencies and provide a ground-source heat pump composite energy system integrating ice storage. By integrating the ground-source heat pump and ice storage, it achieves the dual functions of cooling in summer and heating in winter, while simultaneously solving the technical problem that ice storage systems cannot provide heating. Utilizing the peak-valley electricity price difference, ice storage is achieved through a dual-mode chiller unit during off-peak hours, while ice melting is prioritized for cooling during peak hours, significantly reducing system operating costs. The switchable design of the ground-source heat pump unit and the dual-mode chiller unit improves the system's operational flexibility under different load conditions.

[0006] To address the aforementioned problems, the technical solution of this invention is a ground-source heat pump composite energy system integrating ice storage cooling function, comprising: The ground source heat exchange module includes a buried pipe heat exchanger, a ground source circulation pump, and a ground source filter. The buried pipe heat exchanger is buried in shallow soil and forms a closed circulation loop with the ground source heat exchange end of the heat pump main unit module. An ice storage module includes an ice storage tank, an ice melting heat exchanger, a cold storage circulation pump, and a cold release circulation pump. The ice storage tank is filled with an ice storage coil, one end of which is connected to the ice-making interface of the heat pump main unit and the other end is connected to the ice melting heat exchanger. The heat pump main unit module adopts a dual-condition unit, which can output cold water or hot water at different temperatures according to demand; The intelligent control module is electrically connected to the ground source heat exchange module, the ice storage module, and the heat pump host module. The intelligent control module monitors parameters such as building load, power grid peak and valley periods, soil temperature, and ice storage capacity in real time through sensors and controllers.

[0007] As a preferred method, calculate the cooling load borne by the dual-condition unit: Q M =(Q j -Q d )*65%; Among them, Q M To handle the cooling load for the dual-mode unit, KW; Q j Designed for daily peak load of dual system, KW; Q d The operating cooling capacity of the ground source heat pump unit is KW; 65% is taken as 65% of the peak load of the main unit. Calculate the total ice storage capacity of the system: Q = Q1 * t; A = B * 4%; Where Q is the total ice storage capacity of the system, kWh; Q1 is the cooling capacity of the unit under ice-making conditions, kW; t is the number of nighttime ice-making hours of the unit, h; A is the maximum ice melting rate of the system; B is the design ice cylinder outlet temperature, ℃; 4% is a constant value. Calculate the maximum hourly ice melting capacity of the system based on the total ice storage capacity and the maximum ice melting rate: Q h =Q*A; Among them, Q h The maximum hourly ice melting capacity of the system is expressed in kW.

[0008] Preferably, the ice storage module can switch cooling modes, using a low-temperature ethylene glycol solution as a refrigerant, circulating with the heat pump unit and ice storage device during ice making, and exchanging heat with the terminal during cold release.

[0009] As a preferred method, during off-peak electricity hours at night, the ground source heat pump switches to ice-making mode, using low-temperature ethylene glycol solution to make ice in the ice storage device and store the cooling capacity; during peak electricity release hours, during peak daytime electricity consumption, the stored ice is used to melt and provide cooling, reducing the operating time of the heat pump unit; if the cooling capacity is insufficient, the ground source heat pump is started simultaneously to supplement the cooling supply.

[0010] Preferably, the intelligent control module includes a load monitoring unit, a soil temperature monitoring unit, and a peak-valley electricity price unit.

[0011] Preferably, the intelligent control module can predict the next day's cold or hot load based on historical load data and weather forecasts, and formulate ice-making or cooling plans; it can switch between different modes according to electricity prices and load demand.

[0012] Preferably, the ice storage module further includes an online monitoring unit for ethylene glycol solution concentration, used to monitor and replenish the ethylene glycol solution to prevent a decrease in ice-making efficiency.

[0013] Preferably, the controller has an internal optimization algorithm program that continuously optimizes mode switching and device start-up and shutdown based on historical data, thereby achieving continuous improvement in system operation.

[0014] The advantages of this invention compared to existing technologies are: 1. This invention integrates a ground source heat pump and ice storage, achieving dual functions of cooling in summer and heating in winter, while simultaneously solving the technical problem of ice storage systems being unable to provide heating. Utilizing the peak-valley electricity price difference, ice storage is achieved through a dual-mode chiller unit during off-peak hours, while ice melting is prioritized for cooling during peak hours, significantly reducing system operating costs. The switchable design of the ground source heat pump unit and the dual-mode chiller unit improves the system's operational flexibility under different load conditions. Attached Figure Description

[0015] Figure 1 This is a system structure diagram of the present invention. Detailed Implementation

[0016] To make the content of this invention easier to understand, the technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings.

[0017] like Figure 1 As shown, a ground-source heat pump hybrid energy system integrating ice storage function includes: The ground source heat exchange module includes a buried pipe heat exchanger, a ground source circulation pump, and a ground source filter. The buried pipe heat exchanger is buried in shallow soil and forms a closed circulation loop with the ground source heat exchange end of the heat pump main unit module. The ice storage module includes an ice storage tank, an ice melting heat exchanger, a cold storage circulation pump, and a cold release circulation pump. The ice storage tank is filled with ice storage coils, one end of which is connected to the ice-making interface of the heat pump main unit, and the other end is connected to the ice melting heat exchanger. The ice storage module can switch between cooling modes, using a low-temperature ethylene glycol solution as a refrigerant. During ice making, the solution circulates with the heat pump unit and the ice storage device, and during cold release, it exchanges heat with the terminal. During off-peak electricity ice making at night, the ground source heat pump switches to ice-making mode, using the low-temperature ethylene glycol solution to make ice in the ice storage device and store cold energy. During peak electricity cold release, during peak daytime electricity consumption, the stored ice is melted first to provide cooling, reducing the operating time of the heat pump unit. If the cold energy is insufficient, the ground source heat pump starts simultaneously to supplement the cooling supply. The ice storage module also includes an online ethylene glycol solution concentration monitoring unit to monitor and replenish the ethylene glycol solution to prevent a decrease in ice-making efficiency.

[0018] The heat pump main unit module adopts a dual-mode unit, which can output chilled or hot water at different temperatures according to demand; the cooling load borne by the dual-mode unit is calculated: Q M =(Q j -Q d )*65%; Among them, Q M To handle the cooling load for the dual-mode unit, KW; Q j Designed for daily peak load of dual system, KW; Q d The operating cooling capacity of the ground source heat pump unit is KW; 65% is taken as 65% of the peak load of the main unit. Calculate the total ice storage capacity of the system: Q = Q1 * t; A = B * 4%; Where Q is the total ice storage capacity of the system, kWh; Q1 is the cooling capacity of the unit under ice-making conditions, kW; t is the number of nighttime ice-making hours of the unit, h; A is the maximum ice melting rate of the system; B is the design ice cylinder outlet temperature, ℃; 4% is a constant value. Calculate the maximum hourly ice melting capacity of the system based on the total ice storage capacity and the maximum ice melting rate: Q h =Q*A; Among them, Q h The maximum hourly ice melting capacity of the system is expressed in kW.

[0019] The intelligent control module is electrically connected to the ground source heat exchange module, ice storage module, and heat pump main unit module. Through sensors and controllers, the intelligent control module monitors parameters such as building load, peak and off-peak electricity times, soil temperature, and ice storage capacity in real time. The intelligent control module includes a load monitoring unit, a soil temperature monitoring unit, and a peak / off-peak electricity price unit. Based on historical load data and weather forecasts, the intelligent control module can predict the next day's cooling or heating load and formulate ice-making or cooling release plans; it can switch between different modes according to electricity prices and load demand. The controller has an internal optimization algorithm program that continuously optimizes mode switching and equipment start-up and shutdown based on historical data, achieving continuous improvement in system operation.

[0020] Summer cooling process of the system: Hot water from the condenser enters the geothermal heat exchanger for heat exchange and releases heat. The refrigerant in the heat pump absorbs heat from the evaporator and exchanges heat with water in the cooling cycle in the condenser, transferring heat out of the heat pump system. The evaporator in the heat pump system charges the ice storage tank for cooling, the ice storage tank stores cold, and the evaporator or ice storage tank supplies cooling to the air conditioning heat exchanger, providing low-temperature air supply to the room.

[0021] Winter heating system process: During the summer, the heat pump continuously releases heat into the soil through the geothermal heat exchanger, causing the soil temperature to gradually rise. At the same time, the shallow surface layer of the earth acts as a solar collector, absorbing and accumulating solar radiation energy in the summer. In winter, the underground temperature is relatively high, and by inputting a small amount of high-grade electrical energy, the low-grade energy in the soil can be transported out and heated by the heat pump unit to supply indoor heating.

[0022] The present invention and its embodiments have been described above, and such description is not restrictive. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the protection scope of the present invention.

Claims

1. A ground-source heat pump composite energy system integrating ice storage cooling function, characterized in that, include: The ground source heat exchange module includes a buried pipe heat exchanger, a ground source circulation pump, and a ground source filter. The buried pipe heat exchanger is buried in shallow soil and forms a closed circulation loop with the ground source heat exchange end of the heat pump main unit module. An ice storage module includes an ice storage tank, an ice melting heat exchanger, a cold storage circulation pump, and a cold release circulation pump. The ice storage tank is filled with an ice storage coil, one end of which is connected to the ice-making interface of the heat pump main unit and the other end is connected to the ice melting heat exchanger. The heat pump main unit module adopts a dual-condition unit, which can output cold water or hot water at different temperatures according to demand; The intelligent control module is electrically connected to the ground source heat exchange module, the ice storage module, and the heat pump host module. The intelligent control module monitors parameters such as building load, power grid peak and valley periods, soil temperature, and ice storage capacity in real time through sensors and controllers.

2. The ground source heat pump composite energy system with integrated ice storage function according to claim 1, characterized in that: Calculate the cooling load borne by the dual-mode unit: Q M =(Q j -Q d )*65%; Among them, Q M To handle the cooling load for the dual-mode unit, KW; Q j Designed for daily peak load of dual system, KW; Q d The operating cooling capacity of the ground source heat pump unit is KW; 65% is taken as 65% of the peak load of the main unit. Calculate the total ice storage capacity of the system: Q = Q1 * t; A = B * 4%; Where Q is the total ice storage capacity of the system, kWh; Q1 is the cooling capacity of the unit under ice-making conditions, kW; t is the number of nighttime ice-making hours of the unit, h; A is the maximum ice melting rate of the system; B is the design ice cylinder outlet temperature, ℃; 4% is a constant value. Calculate the maximum hourly ice melting capacity of the system based on the total ice storage capacity and the maximum ice melting rate: Q h =Q*A; Among them, Q h The maximum hourly ice melting capacity of the system is expressed in kW.

3. The ground source heat pump composite energy system with integrated ice storage function according to claim 1, characterized in that: The ice storage module can switch between cooling modes, using a low-temperature ethylene glycol solution as a refrigerant. During ice making, it circulates with the heat pump unit and ice storage device, and during cold release, it exchanges heat with the terminal.

4. A ground-source heat pump composite energy system integrating ice storage cooling function according to claim 3, characterized in that: During off-peak electricity hours at night, when ice is produced, the ground source heat pump switches to ice-making mode and produces ice in the ice storage device using low-temperature ethylene glycol solution to store cold energy. During peak electricity release, when electricity consumption is high during the day, the stored ice is melted first to provide cooling, reducing the operating time of the heat pump unit. If the cooling capacity is insufficient, the ground source heat pump will start simultaneously to supplement the cooling supply.

5. A ground-source heat pump composite energy system integrating ice storage cooling function according to claim 1, characterized in that: The intelligent control module includes a load monitoring unit, a soil temperature monitoring unit, and a peak-valley electricity price unit.

6. A ground-source heat pump composite energy system integrating ice storage cooling function according to claim 5, characterized in that: The intelligent control module can predict the next day's cold or hot load based on historical load data and weather forecasts, and formulate ice-making or cooling plans; it can switch between different modes according to electricity prices and load demand.

7. A ground-source heat pump composite energy system integrating ice storage cooling function according to claim 1, characterized in that, The ice storage module also includes an online monitoring unit for ethylene glycol solution concentration, used to monitor and replenish the ethylene glycol solution to prevent a decrease in ice-making efficiency.

8. A ground-source heat pump composite energy system integrating ice storage function according to claim 1, characterized in that, The controller has an internal optimization algorithm program that continuously optimizes mode switching and device start-up and shutdown based on historical data, thereby achieving continuous improvement in system operation.

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