CN115355559A - Low-energy-consumption heat pump system based on geothermal water and cross-season energy storage and operation method thereof - Google Patents

Abstract

The invention discloses a low-energy heat pump system based on geothermal water and inter-seasonal energy storage and its operation method. The geothermal water exploitation well of the system, the primary side heat exchange pipe of the heat exchanger assembly and the geothermal water recharge The wells are sequentially connected; the secondary side heat exchange pipe of the heat exchanger assembly is connected with the cooling and heating users; one end of the heat pump unit is connected with the secondary side heat exchange pipe of the heat exchanger assembly, and the cooling end and heating end of the other end are both connected. It is connected with cooling and heating users; one end of the high-temperature heat pump unit is respectively connected with the secondary side heat exchange pipe of the heat exchanger assembly and the heating end of the heat pump unit, and the other end is connected with the cooling and heating users through the cross-season heat storage tank; The seasonal cold storage tank is connected with the refrigeration end of the heat pump unit, and the other end is connected with the cooling and heating users; the cooling tower is connected with the cross-season cold storage tank. The present invention can utilize the combined cooling strategy of the cross-season cold storage tank and the heat pump unit in summer, and adopt the combined heating strategy of the heat exchanger assembly, the heat pump unit and the cross-season heat storage tank in winter.

Description

Low energy consumption heat pump system and its operation method based on geothermal water and interseasonal energy storage

technical field

The invention belongs to the technical field of heat pump heating and cooling, and in particular relates to a low-energy heat pump system based on geothermal water and inter-seasonal energy storage and an operating method thereof.

Background technique

At present, my country is actively promoting the implementation of the dual-carbon strategy, and various departments are strictly formulating corresponding measures to reduce carbon emissions. In the field of construction, HVAC energy consumption accounts for the largest proportion of the total energy consumption of buildings, so reducing HVAC energy consumption is an important starting point for reducing carbon during building operation; with the improvement of people's living standards, domestic heating and cooling The area of demand continues to expand, the types of heating and cooling systems are different, the system operating efficiency is low, and the energy consumption of HVAC is seriously wasted. Therefore, a heating and cooling system is urgently needed to improve energy utilization efficiency; at the same time in recent years Due to the serious heating pollution in winter in most parts of the north, large-scale coal-to-electricity and coal-to-gas plans were implemented, which caused a shortage of electricity and natural gas resources, which could not meet the daily needs of residents, and brought huge losses to the power and natural gas sectors. Therefore, it is imminent to develop other types of clean energy heating and cooling systems.

At present, the cascade utilization system of geothermal water is generally used for heating in the north, and cannot be used for cooling in summer at the same time. At the same time, the utilization efficiency of geothermal water is low. In the middle stage of heating, it relies too much on the ground source heat pump system to raise the temperature, which increases the energy consumption of the system and reduces the operating efficiency. For example, the invention patent "Heating System for Cascade Utilization of Medium and Deep Geothermal Resources without Interference" (CN109931651A) mentions a cascade utilization of high, medium and low grade parts of geothermal water through heat exchangers, high temperature heat pumps and low temperature heat pumps. Heating system, but this system is only suitable for heating in winter and cannot provide cooling in summer. At the same time, this system does not store the condensation heat of the heat pump unit, and the heat pump unit is turned on for a long time in the heating season, resulting in increased power consumption; invention patent "Cross-seasonal cold storage and heat storage system" (CN107525180B) mentioned a heating and cooling system that utilizes ice-source heat pump units to realize inter-seasonal cold storage and heat storage, but the ice-source heat pump units mentioned in this system consume a large amount of energy during operation. The electricity and operating costs are high, and the debugging of the system is complicated during operation, so it is difficult to meet the heating and cooling needs of the user side. The invention patent "Vertical Geothermal Energy Storage Air Conditioning System" (CN1137352C) mentions a heat exchange and heat storage system suitable for residential buildings, but this system has a relatively small range of use and is only suitable for small-scale utilization, and geothermal water has not been used. Cascade utilization means recharging, the utilization rate of geothermal water is low, and most of the equipment is underground, and the operability of the equipment is low, resulting in poor heating and cooling effects; the invention patent "a seasonal energy storage ground source heat pump system" (CN103277939B) mentions a system for storing industrial waste heat in the rock-soil base temperature layer for heating in winter. This system is mainly used in the industrial field, and a certain scale of rock-soil base temperature layer needs to be set at the same time, and the construction cost is high. Moreover, the heat storage effect is poor, and a large amount of electric energy is required to discharge heat to the base temperature layer in summer, which is not in line with the carbon reduction strategy; the invention patent "Comprehensive Renewable Energy Cooling and Heating System" (CN104864447B) mentions a comprehensive utilization of deep geothermal , shallow geothermal and desalinated seawater heat energy systems, this system simply connects the above units in parallel for heat supply, without considering the system efficiency, so there is still the problem of wasting heat energy. Invention patent "Geothermal Heating-Energy Storage Integrated System and Application with Low Cost Operation" (CN113531630A) mentions a system that stores the heat of geothermal water with an energy storage unit for heating. This system can only be used for heating in winter , the heat storage unit is affected by the temperature of geothermal water, and the peak shaving capacity is limited at the same time; the invention patent "Geothermal Heating-Energy Storage Integrated System and Application of Low-cost Operation" (CN113531630A) mentions a kind of intermittent energy The generated heat is stored and combined with geothermal water for heating. This system requires sufficient intermittent energy in addition to sufficient geothermal water resources. It is difficult to balance the heating needs of various regions, so the scope of application is limited.

Contents of the invention

In view of this, the present invention provides a low-energy heat pump system based on geothermal water and cross-seasonal energy storage and its operation method, which can use the combined cooling strategy of cross-seasonal cold storage tanks and heat pump units in summer, and adopt the first-level heat pump system in winter The combined heating strategy of heat exchangers, secondary heat exchangers, heat pump units and cross-season heat storage tanks minimizes the start-up time of heat pump units, reduces system energy consumption, and improves system operating efficiency.

The present invention is achieved through the following technical solutions:

A low-energy heat pump system based on geothermal water and inter-season energy storage, including geothermal water recovery wells, geothermal water recharge wells, heat exchanger components, heat pump units, high-temperature heat pump units, inter-season heat storage tanks, cooling towers, cross-season cold storage tanks, and cooling and heating users;

The geothermal water production well, the heat exchange pipe on the primary side of the heat exchanger assembly and the geothermal water recharge well are sequentially connected; the heat exchange pipe on the secondary side of the heat exchanger assembly is connected with the cooling and heating users for Heating for hot and cold users;

One end of the heat pump unit communicates with the heat exchange pipe on the secondary side of the heat exchanger assembly, and the other end is divided into a cooling end and a heating end, and both the cooling end and the heating end are connected to the cooling and heating users, and the cooling end is used for Provide cooling for hot and cold users, and the heating end is used to provide heat for cold and hot users;

One end of the high-temperature heat pump unit is connected with the secondary side heat exchange pipe of the heat exchanger assembly and the heating end of the heat pump unit, and the other end is connected with the cooling and heating users through the cross-season heat storage tank. The high-temperature heat pump unit is used to supply Heat storage in cross-season heat storage tanks, which are used to provide heat for cooling and heating users;

The cross-season cold storage tank is connected with the cooling end of the heat pump unit, and the other end is connected with the cooling and heating users, and the cross-season cold storage tank is used to provide cooling for the cooling and heating users; the cooling tower is connected with the cross-season cold storage tank for cooling across the season. Seasonal cold storage tank for cold storage.

Further, the heat pump system also includes a constant pressure tank and domestic hot water users;

Domestic water is stored in the constant pressure tank, the input end of the constant pressure tank is connected with the external water source, the output end of the constant pressure tank is connected with the domestic hot water user, and the external water source provides domestic hot water users with the constant pressure tank. water;

The constant pressure tank exchanges heat with the secondary side heat exchange pipe of the heat exchanger assembly, and the secondary side heat exchange pipe of the heat exchanger assembly heats the domestic water in the constant pressure tank; the constant pressure tank and the cross-season storage The heat tank is used for heat exchange, and the cross-season heat storage tank further heats the domestic water in the constant pressure tank.

Further, the heat pump system further includes a valve group, and the valve group includes: valve one, valve two, valve three, valve four, valve five, valve six, valve seven, valve eight, valve nine, valve ten, valve eleven and valve twelve;

The heat exchanger assembly includes a primary heat exchanger and a secondary heat exchanger;

The cooling end of the heat pump unit is an evaporator, and the heating end is a condenser;

The geothermal water production well communicates with the input end of the primary heat exchange pipe of the primary heat exchanger through a pipeline, and the output end of the primary heat exchange pipe of the primary heat exchanger communicates with the secondary heat exchanger through a pipeline. The input end of the heat exchange pipe on the primary side of the secondary heat exchanger is connected, and the output end of the heat exchange pipe on the primary side of the secondary heat exchanger is connected with the geothermal water reinjection well through the pipe;

The output end of the cooling and heating user is connected to the input end of the secondary side heat exchange channel of the primary heat exchanger through the pipeline c, and the output end of the secondary side heat exchange channel of the primary heat exchanger is connected through the pipeline b Connected with the input end for cooling and heating users;

The output end of the secondary side heat exchange pipe of the secondary heat exchanger communicates with the pipeline b through the pipeline e, and the intersection of the pipeline e and the pipeline b is point G; the secondary side heat exchange of the secondary heat exchanger The input end of the pipeline communicates with pipeline c through pipeline f, and the junction of pipeline c and pipeline f is point H;

The first input end of the evaporator of the heat pump unit communicates with the pipeline e through the pipeline a, and the junction of the pipeline a and the pipeline e is point I, and the first output terminal of the evaporator communicates with the pipeline f; The second input end communicates with the pipeline c through the pipeline g, and the junction of the pipeline g and the pipeline c is point K, the second output terminal of the evaporator communicates with the pipeline b through the pipeline d, and the pipeline d connects with the pipeline The intersection of road b is point J;

The output end of the condenser of the heat pump unit communicates with the pipeline b through the pipeline h, and the intersection of the pipeline h and the pipeline b is point L, the input end of the condenser communicates with the pipeline c through the pipeline i, and the pipeline The intersection of i and pipeline c is point M;

The heat supply outlet of the cross-season heat storage tank is connected to the pipeline b through the pipeline k, and the intersection of the pipeline k and the pipeline b is point A; the heat supply return port of the cross-season heat storage tank passes through the pipeline l and the pipeline c is connected, and the intersection of pipeline l and pipeline c is point P;

The heat storage outlet of the cross-season heat storage tank is connected to the first input end of the high-temperature heat pump unit; the first output end of the high-temperature heat pump unit is connected to the pipeline c through the pipeline m, and the intersection of the pipeline m and the pipeline c is Q point; the second input end of the high-temperature heat pump unit communicates with the pipeline b through the pipeline j, and the junction of the pipeline j and the pipeline b is point N, and the second output end of the high-temperature heat pump unit is connected with the storage tank of the cross-season heat storage tank thermal inlet connection;

The cooling outlet of the cross-seasonal cold storage tank is connected to the pipeline b through the pipeline s, the intersection of the pipeline s and the pipeline b is point U, and the cooling return port of the cross-seasonal cold storage tank is connected with the pipeline c through the pipeline r , and the intersection of pipeline r and pipeline c is point T;

The cold storage outlet of the cross-seasonal cold storage tank is connected with the pipeline g through the pipeline q, the cold storage inlet of the cross-seasonal cold storage tank is connected with the pipeline d through the pipeline p, and the intersection of the pipeline p and the pipeline d is point S; at the same time, Pipeline q communicates with pipeline h through branch n, and the intersection of branch n and pipeline h is point R, and the intersection of branch n and pipeline q is point X; pipeline p passes through branch o and Pipeline i is connected, and the junction of branch o and pipeline p is point B;

The cooling tower communicates with the branch n and the branch o through the pipeline w, that is, one end of the pipeline w communicates with the branch o, the other end of the pipeline w communicates with the branch n, and the pipeline w connects with the branch n The intersection is point Y; the middle part of the pipeline w flows through the cooling tower, and the cooling tower cools down the hot water in the pipeline w;

Pipeline j and pipeline n are connected through branch t, and the intersection of pipeline n and branch t is point V, and the intersection of pipeline j and branch t is point W; pipeline m and pipeline o pass through The branch u is connected;

The first valve is installed on the pipeline b, and is located between points N and J; the second valve is located on the pipeline j, and is located between the points N and W; the third valve is located on the pipeline e, and is located at G Between point and point I; valve four is located on pipeline a, valve five is located on pipeline d, and is located between point S and point J; valve six is located on pipeline h, and is located between point R and point L ;Valve 7, valve 9 and valve 10 are located on pipeline n, valve 7 is located between point R and point V, valve 9 is located between point V and point Y, valve 10 is located between point Y and point X; Valve 8 is located on pipeline p, between point S and point B; valve 11 is located on pipeline k, and is located between point Z and point A; valve 12 is located on pipeline s.

Further, the valve group also includes valve thirteen; the heat exchanger assembly also includes a three-stage heat exchanger;

The primary side heat exchange pipe of the tertiary heat exchanger is connected in series between the primary side heat exchange pipe of the secondary heat exchanger and the geothermal water recharge well, that is, the output of the primary side heat exchange pipe of the secondary heat exchanger The end is connected with the input end of the primary side heat exchange pipe of the three-stage heat exchanger through the pipeline, and the output end of the primary side heat exchange pipe of the three-stage heat exchanger is connected with the geothermal water recharge well through the pipeline;

The output end of the secondary side heat exchange pipe of the tertiary heat exchanger communicates with the input end of the secondary side heat exchange pipe of the tertiary heat exchanger through the pipeline z, and the pipeline z flows through the constant pressure tank, from The water flowing out of the heat exchange pipe on the secondary side of the three-stage heat exchanger heats the domestic water in the constant pressure tank through the pipe z;

The pipeline k and the pipeline l exchange heat with the constant pressure tank respectively through the pipeline y, that is, one end of the pipeline y is connected with the pipeline k, and the junction of the pipeline y and the pipeline k is point Z, and the pipeline y The other end of the pipe is connected with the pipeline l, the pipeline y flows through the constant pressure tank, and the hot water flowing out from the cross-season heat storage tank further heats the domestic water in the constant pressure tank through the pipeline y; the valve 13 is located in the pipeline on the road.

Further, the heat exchanger assembly adopts a fixed tube-sheet heat exchanger or a U-shaped tube-sheet heat exchanger.

An operation method of a low-energy heat pump system based on geothermal water and cross-seasonal energy storage. Based on the above-mentioned low-energy heat pump system, the operation method includes two operation modes, namely summer operation mode and winter operation mode. By switching the valve group The switch of the valve inside can realize the switching between summer operation mode and winter operation mode.

Further, in the summer operation mode, heat storage and cooling are carried out. At the beginning of the cooling, all valves are closed, and valve 12 is opened first, and the pipe section from the cooling outlet to the cooling return in the cross-season cold storage tank, The cooling circulation circuit composed of the pipeline s, pipeline r and pipeline b from the U point on the pipeline to the pipeline section between the cooling and heating users, and the T point on the pipeline c to the cooling and heating user's pipeline section is connected , use the cold energy in the cross-season cold storage tank to supply cold and hot users;

When the cooling capacity in the cross-season cold storage tank cannot meet the cold demand, close valve 12, open the heat pump unit and open valve 5, the pipe sections and pipelines d, The cooling circulation circuit composed of point J on the pipeline g and pipeline b to the pipeline section between the cooling and heating users and the K point on the pipeline c to the pipeline section between the cooling and heating users is connected, and the heat pump unit is used The cooling capacity generated by the evaporator is used for cooling and heating users;

During heat storage in summer, on the basis of using the heat pump unit for cooling, open the high-temperature heat pump unit, valve 2, valve 7 and valve 9, and combine the hot water flowing out of the condenser of the heat pump unit with the secondary heat from the primary heat exchanger. After the hot water flowing out of the side heat exchange pipe is mixed in the high-temperature heat pump unit, the temperature is raised by the high-temperature heat pump unit, and it is connected with the cross-season heat storage tank to store heat for the cross-season heat storage tank; this method also recovers the condensation of the heat pump unit The heat of the heat storage device, and part of the heat in the geothermal water extracted from the geothermal water exploitation well; when the cross-season heat storage tank reaches the heat storage limit, the excess heat generated by the condenser in the heat storage heat pump unit is discharged through the cooling tower;

During the whole process of heat storage and cooling in summer, the geothermal water flows out from the geothermal water extraction well, passes through the primary heat exchanger, the secondary heat exchanger, and the tertiary heat exchanger in turn for heat exchange and cooling, and then flows into the geothermal water return system. fill the well;

When it is necessary to provide domestic hot water users with domestic water, the water flowing out of the heat exchange pipe on the secondary side of the three-stage heat exchanger passes through the pipeline z to heat the domestic water in the constant pressure tank, when the domestic water in the constant pressure tank After the temperature reaches the set temperature, it will output domestic hot water users with the set temperature; when the domestic water in the constant pressure tank cannot be heated to the set temperature only by the three-stage heat exchanger, open valve 13, The domestic water in the constant pressure tank is mixed with the hot water discharged from the heat supply outlet of the cross-season heat storage tank to further increase the temperature, and then output to domestic hot water users to provide domestic water at a set temperature.

Further, when the heat pump unit is used for cooling, the valve eight is opened in the valley section of electricity consumption, and the pipe sections, pipeline p, pipeline q and cross-season cold storage tank of the second input end and second output end of the evaporator in the heat pump unit The cold storage circuit formed by the pipe section between the cold storage inlet and the cold storage outlet in the heat pump unit is connected; the cold generated by the evaporator of the heat pump unit stores cold for the cross-season cold storage tank; the heat pump unit is turned off during the peak period of electricity consumption, and the valve 12 is opened to only use Cross-season cold storage tanks for cooling.

Furthermore, in the winter operation mode, cold storage and heat supply are carried out. When heating in winter, the user load is divided into load levels. In the initial stage of heating, it is the first-level load. When the outdoor temperature decreases and the heating load increases, it is Secondary load; when the outdoor temperature drops further and the heating load rises again, it is a third-level load; when the heating load reaches its peak value, it is a fourth-level load; the specific operation process of heating is as follows:

At the beginning of heat supply, all valves are closed. When the primary load is applied, valve 1 is opened, and the primary heat exchanger is used for direct heating, that is, the secondary side heat exchange pipes, pipeline b, Once the heat supply circulation circuit formed between the pipeline c and the cooling and heating users is connected, the primary heat exchanger realizes the direct supply to the cooling and heating users by exchanging heat with the geothermal water flowing out of the geothermal water exploitation well. At the same time, the high-temperature heat pump unit and valve 2 are turned on, and the geothermal water is used to store heat in the cross-season heat storage tank;

In the secondary load, open the valve 3, and adopt the joint heating method of the primary heat exchanger and the secondary heat exchanger, that is, the secondary side heat exchange pipes, pipeline b, pipeline c and the power supply of the primary heat exchanger Once the heating circulation circuit formed between the cold and hot users is connected, the heat exchange pipes, pipeline e, pipeline f, and pipeline b on the secondary side of the secondary heat exchanger are connected between point G on the heat supply and cooling users. The heating circulation circuit composed of the pipe section and the H point on the pipeline c to the cooling and heating users is connected. The heat exchange of geothermal water realizes the combined heat supply for cold and hot users;

In the third-level load, open valve 11, close valve 2, and adopt the combined heating mode of geothermal water and cross-season heat storage tank, that is, the secondary side heat exchange pipes, pipe b, and pipe c of the primary heat exchanger As soon as the heating circulation circuit formed between the cooling and heating users is connected, the secondary side heat exchange pipes, pipeline e, pipeline f, and pipeline b of the secondary heat exchanger point G to the cooling and heating users The heating circulation circuit composed of the pipe section between and the H point on the pipeline c to the pipe section between the cooling and heating users is connected, and the pipe section between the heat supply outlet and the heat supply return in the cross-season heat storage tank , pipeline k, pipeline l, pipeline b to the pipeline section between point A for cooling and heating users, and point P on pipeline c to the pipeline section for cooling and heating users to form a heating cycle loop three connected, the primary heat exchanger and the secondary heat exchanger respectively exchange heat with the geothermal water flowing out of the geothermal water exploitation well and the heat provided by the cross-seasonal heat storage tank to realize the combined supply of cooling and heating users. hot;

At the fourth level of load, open valve four and valve six, and the heat pump unit starts to run at this time, using the combined heating mode of geothermal water direct supply + cross-season heat storage tank + heat pump unit, that is, the secondary side exchange of the primary heat exchanger As soon as the heat supply circulation circuit composed of the heat pipe, pipeline b, pipeline c and the cooling and heating users is connected, the secondary side heat exchange pipeline, pipeline e, pipeline f, and pipeline of the secondary heat exchanger The heat supply circulation circuit composed of point G on b to the pipe section between the cooling and heating users and the H point on the pipeline c to the pipe section between the cooling and heating users is connected, and the heat supply in the cross-season heat storage tank The pipeline section between the outlet and the heating return port, pipeline k, pipeline l, point A on pipeline b to the pipeline section between the cooling and heating users, and point P on the pipeline c to the cooling and heating users The heat supply circulation circuit composed of the pipe sections among them is connected three times, the condenser of the heat pump unit, pipeline i, pipeline h, point L on the pipeline b to the pipeline section between the cooling and heating users and M on the pipeline c The heat supply circulation loop composed of the pipe sections between the point and the cooling and heating users is connected four times. The heat provided by the seasonal heat storage tank and the heat provided by the condenser of the heat pump unit realizes the combined heat supply for cooling and heating users;

When storing cold in winter, open the valve ten, connect the cooling tower with the cross-seasonal cold storage tank, and add antifreeze to the circulating medium of the loop composed of the cooling tower and the cross-seasonal cold storage tank; the cooling tower collects the cooling capacity of the outside air, and The cold energy is transferred to the cross-season cold storage tank for cold storage, which is used for cooling in summer;

During the whole process of cold storage and heat supply in winter, geothermal water flows out from the geothermal water exploitation well, passes through the primary heat exchanger, secondary heat exchanger, and tertiary heat exchanger in turn for heat exchange and cooling, and then flows into the geothermal water for recharge. well;

When it is necessary to provide domestic hot water users with domestic water, the water flowing out of the heat exchange pipe on the secondary side of the three-stage heat exchanger passes through the pipeline z to heat the domestic water in the constant pressure tank, when the domestic water in the constant pressure tank After the temperature reaches the set temperature, it will output domestic hot water users with the set temperature; when the domestic water in the constant pressure tank cannot be heated to the set temperature only by the three-stage heat exchanger, open valve 13, The domestic water in the constant pressure tank is mixed with the hot water discharged from the heat supply outlet of the cross-season heat storage tank to further increase the temperature, and then output to domestic hot water users to provide domestic water at a set temperature.

Further, when the heat pump unit is used for heat supply, the valve 7 is opened in the valley section of electricity consumption, and the condenser of the heat pump unit is connected with the cross-season heat storage tank, and the heat generated by the condenser of the heat pump unit is stored in the cross-season heat storage tank. hot.

Beneficial effect:

(1) The heat pump system of the present invention can make full use of geothermal water, cross-seasonal energy storage tanks and heat pump units for heating or cooling, that is, in summer, the strategy of using cross-seasonal cold storage tanks and heat pump units for joint cooling is adopted, and in winter a combination of cold storage tanks and heat pump units is used. The combined heating strategy of first-stage heat exchangers, second-stage heat exchangers, heat pump units, and cross-seasonal heat storage tanks minimizes the start-up time of heat pump units, reduces system energy consumption, and improves system operating efficiency; at the same time, it achieves the goal of fully utilizing clean energy. The purpose of heating and cooling, and the present invention is convenient to use, easy to run and operate, good in stability, wide in scope of application and high in reliability.

(2) The present invention can not only provide cooling and heating for users, but also provide domestic water for domestic hot water users, and heat the domestic water to improve the convenience and comfort of using domestic water.

(3) The primary heat exchanger, secondary heat exchanger and tertiary heat exchanger in the heat exchanger assembly of the present invention all adopt fixed tube-sheet heat exchanger or U-shaped tube-sheet heat exchanger, which improves the geothermal energy Heat exchange effect between water and other components.

(4) The present invention proposes an operation strategy for the system under different loads of heating and cooling conditions in winter and summer. By switching the valves in the valve group, the switch between the summer operation mode and the winter operation mode is realized, which greatly reduces the system operation time. energy consumption and improve system operating efficiency.

(5) The present invention combines geothermal water, geothermal water cascade heat exchange channels, heat pump units and cross-season energy storage tanks to realize the function of both heating and cooling; the system adopts joint heating and supply in different periods The cold mode greatly reduces the turn-on time of the heat pump unit for heating in winter and cooling in summer, effectively improves the operating efficiency of the system, and greatly reduces the consumption of high-grade energy such as electricity and natural gas. It conforms to the clean energy heating policy and strongly promotes the dual Implementation of the carbon strategy.

(6) When the present invention is cooling in summer, the heat pump unit is turned on in the valley section of electricity consumption, and the cooling capacity generated by the evaporator of the heat pump unit is used to store cold in the cross-season cold storage tank; when heating is supplied in winter, the heat pump is turned on in the valley section of electricity consumption The heat generated by the condenser of the unit and the heat pump unit stores heat in the inter-season heat storage tank; when heating and cooling, the inter-season energy storage tank is used to recover and store the system's residual cold and waste heat for use across seasons, reducing The energy consumption of HVAC reduces the heating and cooling operation cost of the whole system; on the one hand, in summer, the waste heat on the condenser side of the heat pump unit and the heat absorbed by the geothermal water are recovered by using the cross-season heat storage tank; On the one hand, in winter, using natural cold sources in winter to store cold energy for cooling in summer can effectively reduce the cooling start-up time of the heat pump unit and reduce system energy consumption; When the cooling capacity of the cold storage tank is insufficient, turn on the heat pump unit for cooling, which saves electricity during cooling in summer. At the same time, when the heat pump unit is cooling, it will inevitably generate heat (40-50 ℃) , higher than the summer temperature, the heat is stored for heating in winter, and geothermal water can also be used for storage in summer, and the cross-season heat storage tank is fully stored for use in winter, reducing heating energy consumption in winter; When heating, give priority to the use of geothermal water for heating. When the load rises, the combined heating of the primary and secondary boards is replaced. When the load rises again, the combined heating of geothermal water and heat storage tanks is used. When the load reaches the peak, the heat pump unit is turned on for heating to minimize The heat pump unit is turned on at the same time, and the natural cold source is used to store cold in winter to reduce the energy consumption of cooling in summer.

In summary, the geothermal water recovery well of the present invention is connected to the first-stage heat exchanger, the second-stage heat exchanger, and the third-stage heat exchanger in turn, and finally recharges the geothermal water to the geothermal water recharge well; The heat exchange pipe on the secondary side of the heat exchanger is connected to the cold and hot users. At the same time, it can be mixed with the condensation side of the heat pump unit during the non-heating and heating low-load periods, and then connected to the high-temperature heat pump unit for heat storage, realizing the function of recovery + heat storage; The heat exchange pipe on the secondary side of the secondary heat exchanger is connected with the heat pump unit to provide heat source for heating in winter. At the same time, when the heating load is low, the combined heating of the primary heat exchanger and the secondary heat exchanger can be realized to reduce system consumption. Electricity; the cooling tower communicates with the cross-seasonal cold storage tank in winter for cross-seasonal cold storage; the three-stage heat exchanger and the cross-seasonal heat storage tank are mixed with water through a constant pressure tank to generate domestic hot water at 50-60°C; The evaporator side of the heat pump unit is connected to the user for cooling in summer, and at the same time, it can be connected to the cross-season cold storage tank when the cooling load is low for peak-shaving cold storage; the condenser side of the heat pump unit is connected to the high-temperature heat pump unit for cooling in summer. Cross-season heat storage, when the heat storage tank reaches the maximum capacity, the condenser side of the heat pump unit is connected to the cooling tower, and heat is discharged to the outside; the invention uses geothermal water to couple the cross-season energy storage tank to realize the cross-season use of cold and heat , so that the traditional geothermal water cascade utilization system realizes the same supply of cold and heat, and at the same time uses the valley electricity energy storage to stabilize the load of the power grid; fully recovers the heat of the condensation side of the heat pump unit and the natural cooling capacity of the outdoor in winter, which greatly reduces the energy consumption of the heat pump unit. power consumption, greatly improving the utilization rate of geothermal water and the operating efficiency of the whole system; Meet the cooling, heating and domestic hot water needs of different types of users.

Description of drawings

Fig. 1 is the structural composition schematic diagram of the present invention;

Fig. 2 is the schematic diagram that the geothermal water outlet temperature of the present invention is 55 ℃;

Fig. 3 is the schematic diagram of the summer operating condition of the present invention;

Fig. 4 is a schematic diagram of the winter operating conditions of the present invention.

Among them, 1- geothermal water recovery well, 2- geothermal water recharge well, 3- primary heat exchanger, 4- secondary heat exchanger, 5- tertiary heat exchanger, 6- heat pump unit, 7- High temperature heat pump unit, 8-cross-season heat storage tank, 9-cooling tower, 10-cross-season cold storage tank, 11-constant pressure tank, 12-cooling and heating users, 13-domestic hot water users, 14-valve one, 15 -Valve Two, 16-Valve Three, 17-Valve Four, 18-Valve Five, 19-Valve Six, 20-Valve Seven, 21-Valve Eight, 22-Valve Nine, 23-Valve Ten, 24-Valve Eleven, 25-valve twelve, 26-valve thirteen.

Detailed ways

The present invention will be described in detail below with reference to the accompanying drawings and examples.

Example 1:

This embodiment provides a low-energy heat pump system based on geothermal water and inter-season energy storage, see Figure 1-2, including geothermal water recovery well 1, geothermal water recharge well 2, and a primary heat exchanger 3. Secondary heat exchanger 4. Tertiary heat exchanger 5. Heat pump unit 6. High temperature heat pump unit 7. Cross-seasonal heat storage tank 8. Cooling tower 9. Cross-seasonal cold storage tank 10. Constant pressure tank 11. Cooling and heating User 12, domestic hot water user 13 and valve group; among them, cross-season heat storage tank 8 and cross-season cold storage tank 10 are collectively referred to as cross-season energy storage tank;

The valve group includes: valve one 14, valve two 15, valve three 16, valve four 17, valve five 18, valve six 19, valve seven 20, valve eight 21, valve nine 22, valve ten 23, valve eleven 24 , Valve 12 25 and Valve 13 26;

The first-stage heat exchanger 3, the second-stage heat exchanger 4 and the third-stage heat exchanger 5 are all provided with two heat exchange pipes, and the two heat exchange pipes are respectively the primary side heat exchange pipe and the secondary side heat exchange pipe. pipeline;

The heat pump unit 6 is composed of an evaporator and a condenser;

The overall connection relationship of the heat pump system is as follows:

The geothermal water production well 1 communicates with the input end of the primary heat exchange pipe of the primary heat exchanger 3 through a pipeline, and the output end of the primary heat exchange pipe of the primary heat exchanger 3 communicates with the secondary heat exchange pipe through a pipeline. The input end of the primary side heat exchange pipe of the heat exchanger 4 is connected, and the output end of the primary side heat exchange pipe of the secondary heat exchanger 4 is connected with the input end of the primary side heat exchange pipe of the tertiary heat exchanger 5 through a pipeline , the output end of the primary side heat exchange pipe of the three-stage heat exchanger 5 communicates with the geothermal water recharge well 2 through the pipeline, the geothermal water exploitation well 1, the primary heat exchanger 3, the secondary heat exchanger 4, The three-stage heat exchanger 5, the geothermal water recharge well 2 and the pipelines connected between them form a geothermal water cascade heat exchange channel;

Domestic water is stored in the constant pressure tank 11, the input end of the constant pressure tank 11 communicates with an external water source through a pipeline, the output end of the constant pressure tank 11 communicates with a domestic hot water user 13 through a pipeline, and the external The water source provides domestic water for domestic hot water users 13 through the constant pressure tank 11;

The output end of the secondary side heat exchange pipe of the tertiary heat exchanger 5 communicates with the input end of the secondary side heat exchange pipe of the tertiary heat exchanger 5 through the pipeline z, and the pipeline z flows through the constant pressure tank 11. The water flowing out from the heat exchange pipe on the secondary side of the three-stage heat exchanger 5 heats the domestic water in the constant pressure tank 11 through the pipe z;

The output end of the cooling and heating user 12 communicates with the input end of the secondary side heat exchange channel of the primary heat exchanger 3 through the pipeline c, and the output end of the secondary side heat exchange channel of the primary heat exchanger 3 passes through The pipeline b communicates with the input end for cooling and heating users 12;

The output end of the secondary side heat exchange pipeline of the secondary heat exchanger 4 communicates with the pipeline b through the pipeline e, and the intersection of the pipeline e and the pipeline b is point G; the secondary heat exchanger 4 The input end of the secondary-side heat exchange pipeline communicates with the pipeline c through the pipeline f, and the junction of the pipeline c and the pipeline f is point H;

The first input end of the evaporator of the heat pump unit 6 communicates with the pipeline e through the pipeline a, and the intersection of the pipeline a and the pipeline e is point I, and the first output end of the evaporator communicates with the pipeline f; The second input end of the evaporator communicates with the pipeline c through the pipeline g, and the junction of the pipeline g and the pipeline c is point K, the second output terminal of the evaporator communicates with the pipeline b through the pipeline d, and the pipeline The junction of d and pipeline b is point J;

The output end of the condenser of the heat pump unit 6 communicates with the pipeline b through the pipeline h, and the intersection of the pipeline h and the pipeline b is point L, and the input end of the condenser communicates with the pipeline c through the pipeline i, And the intersection of pipeline i and pipeline c is point M;

The heat supply outlet of the cross-season heat storage tank 8 communicates with the pipeline b through the pipeline k, and the intersection of the pipeline k and the pipeline b is point A; the heat supply return port of the cross-season heat storage tank 8 passes through the pipeline l communicates with pipeline c, and the junction of pipeline l and pipeline c is point P; said pipeline k and pipeline l exchange heat with said constant pressure tank 11 through pipeline y respectively, that is, pipeline y One end of the pipeline is connected with the pipeline k, the junction of the pipeline y and the pipeline k is the point Z, the other end of the pipeline y is connected with the pipeline l, and the pipeline y flows through the constant pressure tank 11, from the cross-season heat storage tank 8 The hot water flowing out heats the domestic water in the constant pressure tank 11 through the pipeline y;

The heat storage outlet of the cross-season heat storage tank 8 communicates with the first input end of the high-temperature heat pump unit 7; the first output end of the high-temperature heat pump unit 7 communicates with the pipeline c through the pipeline m, and the pipeline m communicates with the pipeline c Point Q is the junction of the high-temperature heat pump unit 7; the second input end of the high-temperature heat pump unit 7 communicates with the pipeline b through the pipeline j, the intersection of the pipeline j and the pipeline b is point N, and the second output end of the high-temperature heat pump unit 7 is connected to the The heat storage inlet of the cross-season heat storage tank 8 is connected;

The cooling outlet of the cross-season cold storage tank 10 communicates with the pipeline b through the pipeline s, the intersection of the pipeline s and the pipeline b is point U, and the cooling return port of the cross-season cold storage tank 10 passes through the pipeline r and the pipeline b. Pipeline c is connected, and the intersection of pipeline r and pipeline c is point T;

The cold storage outlet of the cross-season cold storage tank 10 communicates with the pipeline g through the pipeline q, the cold storage inlet of the cross-season cool storage tank 10 communicates with the pipeline d through the pipeline p, and the intersection of the pipeline p and the pipeline d is S At the same time, pipeline q communicates with pipeline h through branch n, and the intersection of branch n and pipeline h is point R, and the intersection of branch n and pipeline q is point X; pipeline p passes through The branch o is connected to the pipeline i, and the intersection of the branch o and the pipeline p is point B;

The cooling tower 9 communicates with the branch n and the branch o through the pipeline w, that is, one end of the pipeline w communicates with the branch o, the other end of the pipeline w communicates with the branch n, and the pipeline w communicates with the branch o. The intersection of road n is point Y; the middle part of pipeline w flows through cooling tower 9, and cooling tower 9 cools down the hot water in pipeline w;

The pipeline j and the pipeline n are connected through the branch t, and the junction of the pipeline n and the branch t is a point V, and the junction of the pipeline j and the branch t is a point W; the pipeline m and the The pipeline o is connected through the branch u;

Among them, on the pipeline b, points G, N, J, L, A and U are arranged sequentially along the direction from the primary heat exchanger 3 to the cooling and heating users 12, and on the pipeline c, T Point, P point, M point, K point, Q point and H point are arranged sequentially along the direction from the cooling and heating users 12 to the primary heat exchanger 3;

The valve one 14 is installed on the pipeline b, and is located between points N and J; the valve two 15 is located on the pipeline j, and is located between the points N and W; the valve three 16 is located on the pipeline e on, and located between point G and I; valve four 17 is located on pipeline a, valve five 18 is located on pipeline d, and is located between point S and point J; valve six 19 is located on pipeline h, and Located between point R and point L; valve seven 20, valve nine 22 and valve ten 23 are all located on pipeline n, valve seven 20 is located between point R and point V, valve nine 22 is located between point V and point Y , valve ten 23 is located between point Y and point X; valve eight 21 is located on pipeline p, between point S and point B; valve eleven 24 is located on pipeline k, and is located between point Z and point A Between; valve twelve 25 is located on the pipeline s; valve thirteen 26 is located on the pipeline y;

The capacity of the cross-seasonal heat storage tank 8 and the cross-seasonal cold storage tank 10 of the heat pump system of this embodiment can be further adjusted according to user needs, and the cold storage and heat storage media include but are not limited to water, heat transfer oil, molten salt, paraffin, composite Phase change materials, etc.;

The cross-season heat storage tank 8 and the cross-season cold storage tank 10 of the heat pump system in this embodiment are provided with heat exchange coils, and the heat exchange medium in the heat exchange coils is treated water;

The outer surfaces of the cross-season cold storage tank 8 and the cross-season cold storage tank 10 of the heat pump system in this embodiment are provided with high-efficiency thermal insulation materials;

The internal circulation of the heat pump unit 6 of the heat pump system in this embodiment is a refrigerant cycle;

The primary heat exchanger 3, the secondary heat exchanger 4 and the tertiary heat exchanger 5 of the heat pump system of this embodiment are all plate heat exchangers, including but not limited to fixed tube plate heat exchangers, U-shaped tube plate heat exchangers heat exchanger, etc.;

The cooling and heating users 12 of the heat pump system in this embodiment may be radiators, floor heating, fan coil systems, and the like.

Example 2:

On the basis of Example 1, this embodiment provides an operation method of a low-energy heat pump system based on geothermal water and cross-seasonal energy storage. The operation method includes two operation modes, namely summer operation mode and winter operation mode Mode, by switching the switch of the valves in the valve group, the switching between summer operation mode and winter operation mode can be realized:

In the summer operation mode, heat storage and cooling are carried out, see attached drawing 3, close valve one 14, valve three 16, valve four 17, valve six 19, valve ten 23 and valve eleven 24; do not open valve two 15, Valve five 18, valve seven 20, valve eight 21, valve nine 22, valve twelve 25 and valve thirteen 26;

At the beginning of the cold supply, all valves are in the closed state, first open the valve 12 25, and the pipe section, pipeline s, pipeline r, and pipeline b from the cooling outlet in the cross-season cold storage tank 10 to the cooling return port U point to the pipe section between the cooling and heating user 12 and the T point on the pipeline c to the cooling and heating user 12. Once the cold supply circulation circuit is connected, the cooling capacity in the cross-season cold storage tank 10 is used. Provide cold and hot users 12 with cooling;

When the cooling capacity in the cross-season cold storage tank 10 cannot meet the cooling demand, close the valve twelve 25, open the heat pump unit 6 and open the valve five 18, the second input end and the second output end of the evaporator in the heat pump unit 6 The pipe section , pipeline d, pipeline g, and pipeline b from point J to the user 12 for cooling and heating, and point K on pipeline c to the user 12 for cooling and heating. 2. Turn on, use the cooling capacity produced by the evaporator of the heat pump unit 6 to provide cooling to the cooling and heating user 12;

Wherein, when the heat pump unit 6 is used for cooling, the valve 821 is opened in the peak-shaving and valley-filling stage of the power grid, that is, the valve 821 is opened in the valley section of electricity consumption, and the pipe sections and pipe sections and pipes of the second input end and the second output end of the evaporator in the heat pump unit 6 are Road p, pipeline q, and the cold storage circuit formed by the pipe section between the cold storage inlet and the cold storage outlet in the cross-season cold storage tank 10 are connected; the cold generated by the evaporator of the heat pump unit 6 stores cold in the cross-season cold storage tank 10; Turn off the heat pump unit 6 during the electricity peak period, open the valve 12 25, and only use the cross-season cold storage tank 10 for cooling;

When storing heat in summer, on the basis of using the heat pump unit 6 for cooling, open the high-temperature heat pump unit 7, valve two 15, valve seven 20, and valve nine 22 to combine the hot water flowing out of the condenser of the heat pump unit 6 with the The hot water flowing out of the heat exchange pipe on the secondary side of the heat exchanger 3 is mixed in the high-temperature heat pump unit 7, then heated up by the high-temperature heat pump unit 7, and communicated with the cross-season heat storage tank 8 to store the cross-season heat storage tank 8 heat; this method recovers the heat of the condenser of the heat pump unit 6 at the same time, and extracts part of the heat in the geothermal water of the geothermal water exploitation well 1; when the cross-season heat storage tank 8 reaches the heat storage limit, the heat storage heat pump The excess heat generated by the condenser in the unit 6 is discharged through the cooling tower 9;

During the whole process of heat storage and cooling in summer, the geothermal water flows out from the geothermal water exploitation well 1, passes through the primary heat exchanger 3, the secondary heat exchanger 4, and the tertiary heat exchanger 5 in turn, and then flows into the Geothermal water recharge well 2;

When domestic hot water users 13 need to be provided with domestic water, the water flowing out of the secondary side heat exchange pipe of the three-stage heat exchanger 4 heats the domestic water in the constant pressure tank 11 through the pipeline z, and when the constant pressure tank 11 After the temperature of the domestic water reaches the set temperature, it is output to the domestic hot water user 13 to provide the domestic water of the set temperature; when only the three-stage heat exchanger 4 cannot heat the domestic water in the constant pressure tank 11 to the set temperature At this time, open the valve 13 26, the domestic water in the constant pressure tank 11 is mixed with the hot water discharged from the heat supply outlet of the cross-season heat storage tank 8 to further increase the temperature, and then output to the domestic hot water user 13 to provide domestic water with a set temperature. Water; the set temperature is 50-60°C.

In the winter operation mode, cold storage and heat supply are carried out, see attached drawing 4, close valve five 18, valve eight 21, valve nine 22 and valve twelve 25; do not open valve one 14, valve two 15, valve three 16, valve Four 17, valve six 19, valve seven 20, valve ten 23, valve eleven 24 and valve thirteen 26;

When heating in winter, the user load is divided into four load levels. In the initial stage of heating, it is the first-level load. When the outdoor temperature drops and the heating load increases, it is the second-level load; When the load is high, it is the third-level load; when the heating load reaches the peak value, it is the fourth-level load; in this embodiment, the cascade utilization of geothermal water is used for heating, that is, when the first-level load is used, only geothermal water is used for heating. After the load level increases, the cross-season heat storage tank 8 is turned on, and when the load peak is reached, the heat pump unit 6 is turned on. The specific operation process for heating is as follows:

At the beginning of heating, all valves are closed, and at the initial stage of heating (primary load), valve 14 is opened, and the primary heat exchanger 3 is used to directly supply heating, that is, the secondary side heat exchange of the primary heat exchanger 3 Once the heat supply circulation circuit composed of the pipeline, pipeline b, pipeline c and cooling and heating users 12 is connected, the primary heat exchanger 3 exchanges heat with the geothermal water flowing out of the geothermal water exploitation well 1, Realize direct heat supply to cooling and heating users 12; open the high-temperature heat pump unit 7 and valve 2 15 at the same time, and use geothermal water to store heat in the cross-season heat storage tank 8;

When the outdoor temperature drops, the heating load increases (secondary load), open the valve three 16, and adopt the combined heating method of the primary heat exchanger 3 and the secondary heat exchanger 4, that is, the secondary heat exchanger of the primary heat exchanger 3 Once the heat supply circulation circuit formed between the side heat exchange pipes, pipeline b, pipeline c and cooling and heating users 12 is connected, the secondary side heat exchange pipes, pipeline e, and pipelines of the secondary heat exchanger 4 f. The heating circulation circuit composed of the pipe section between point G on the pipeline b to the cooling and heating user 12 and the pipe section between the H point on the pipeline c and the cooling and heating user 12 is connected, and the first stage is replaced. The heater 3 and the secondary heat exchanger 4 realize the joint heat supply to the cooling and heating users 12 by exchanging heat with the geothermal water flowing out of the geothermal water exploitation well 1 respectively;

When the heating load increases again (three-stage load), open valve eleven 24, close valve two 15, and adopt the combined heating mode of geothermal water and cross-season heat storage tank 8, that is, the secondary side of primary heat exchanger 3 Once the heat supply circulation circuit formed between the heat exchange pipes, pipeline b, pipeline c and cooling and heating users 12 is connected, the secondary side heat exchange pipes, pipeline e, and pipeline f of the secondary heat exchanger 4 1. The heating circulation loop two composed of the pipe section between point G on the pipeline b to the cooling and heating user 12 and the pipe section between the H point on the pipeline c and the cooling and heating user 12 is connected, and the heat is stored across seasons The pipeline section between the heat supply outlet and the heat supply return in the tank 8, pipeline k, pipeline l, point A on the pipeline b to the pipeline section between the cooling and heating users 12 and point P on the pipeline c The heat supply circulation loop composed of the pipe section between the user and the heat supply user 12 is three-connected, and the primary heat exchanger 3 and the secondary heat exchanger 4 are exchanged with the geothermal water flowing out of the geothermal water exploitation well 1 respectively. heat, and the heat provided by the inter-season heat storage tank 8, to realize the joint heat supply to the cooling and heating users 12;

When the heating load reaches the peak value (level 4 load), open valve 4 17 and valve 6 19. At this time, the heat pump unit 6 starts to operate, using the combined heating mode of direct geothermal water supply + cross-season heat storage tank 8 + heat pump unit 6, That is, once the heat supply circulation circuit formed between the secondary side heat exchange pipes of the primary heat exchanger 3, pipeline b, pipeline c, and cooling and heating users 12 is connected, the secondary side of the secondary heat exchanger 4 The heat exchange pipeline, pipeline e, pipeline f, the pipeline section between point G on the pipeline b and the cooling and heating user 12, and the pipeline section between the H point on the pipeline c and the cooling and heating user 12. The thermal cycle loop two is connected, and the cross-seasonal heat storage tank 8 is connected between the heat supply outlet and the heat supply return port, the pipeline k, the pipeline l, and the point A on the pipeline b to the cooling and heating user 12. The heating circulation loop composed of the pipe section between and the point P on the pipeline c to the pipe section between the cooling and heating users 12 is connected three times, and the condenser, pipeline i, pipeline h, and pipeline b of the heat pump unit 6 The heating circulation circuit composed of point L on the top to the pipe section between the cooling and heating users 12 and the M point on the pipeline c to the pipe section between the cooling and heating users 12 is connected, and the primary heat exchanger 3 and The secondary heat exchanger 4 realizes the cooling and heating users through the heat exchange with the geothermal water flowing out of the geothermal water exploitation well 1, the heat provided by the cross-season heat storage tank 8, and the heat provided by the condenser of the heat pump unit 6. Combined heating of 12;

At the same time, when the heat pump unit 6 is used for heating, the valve 720 is opened during the peak-shaving and valley-filling stage of the power grid, that is, the valve 720 is opened in the valley section of electricity consumption, and the condenser of the heat pump unit 6 is connected with the cross-season heat storage tank 8, and the heat pump unit 6 The heat generated by the condenser stores heat in the cross-season heat storage tank 8, which serves the purpose of peak regulation;

When storing cold in winter, open the valve ten 23, the cooling tower 9 is connected with the cross-season cold storage tank 10, and antifreeze is added in the loop circulation medium formed by the cooling tower 9 and the cross-season cold storage tank 19; the cooling tower 9 collects the temperature of the outside air Cooling capacity, and the cooling capacity is transferred to the cross-season cold storage tank 10 for cold storage, which is used for cooling in summer;

During the whole process of cold storage and heat supply in winter, the geothermal water flows out from the geothermal water exploitation well 1, passes through the primary heat exchanger 3, the secondary heat exchanger 4, and the tertiary heat exchanger 5 in order to cool down and then flows into the ground. Hot water recharge well 2;

When domestic hot water users 13 need to be provided with domestic water, the water flowing out of the secondary side heat exchange pipe of the three-stage heat exchanger 4 heats the domestic water in the constant pressure tank 11 through the pipeline z, and when the constant pressure tank 11 After the temperature of the domestic water reaches the set temperature, it is output to the domestic hot water user 13 to provide the domestic water of the set temperature; when only the three-stage heat exchanger 4 cannot heat the domestic water in the constant pressure tank 11 to the set temperature At this time, open the valve 13 26, the domestic water in the constant pressure tank 11 is mixed with the hot water discharged from the heat supply outlet of the cross-season heat storage tank 8 to further increase the temperature, and then output to the domestic hot water user 13 to provide domestic water with a set temperature. Water; the set temperature is 50-60°C.

The joint heating mode of the primary heat exchanger 3 and the secondary heat exchanger 4 means that when the primary heat exchanger 3 cannot meet the heating demand, the primary heat exchanger 3 and the secondary heat exchanger 4 are turned on at the same time, After mixing the water supply in the secondary side heat exchange pipes of the primary heat exchanger 3 and the secondary heat exchanger 4, it is supplied to the cooling and heating users 12 (experiments show that in a specific area, when the outdoor temperature is lower than 9°C, a The direct supply of stage heat exchanger 3 cannot meet the heating demand. At this time, the joint heating mode of stage 1 heat exchanger 3 and stage 2 heat exchanger 4 is turned on, which can meet the heating demand when the outdoor temperature is 6-9 ℃, thereby reducing the heat pump turn-on time of unit 6).

The heat pump system of this embodiment is suitable for areas where the temperature of the geothermal water is above 55 degrees Celsius. The higher the temperature of the geothermal water, the lower the energy consumption of the system and the higher the efficiency;

The heat pump system of this embodiment is suitable for heating and cooling of public buildings rich in geothermal water resources and residential buildings.

To sum up, the above are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. A low-energy-consumption heat pump system based on geothermal water and cross-season energy storage is characterized by comprising a geothermal water production well, a geothermal water recharging well, a heat exchanger assembly, a heat pump unit, a high-temperature heat pump unit, a cross-season heat storage tank, a cooling tower, a cross-season cold storage tank and a cold and heat supply user;

the geothermal water production well, the primary side heat exchange pipeline of the heat exchanger assembly and the geothermal water recharging well are communicated in sequence; the secondary side heat exchange pipeline of the heat exchanger assembly is communicated with a cold and heat supply user and used for supplying heat to the cold and heat supply user;

one end of the heat pump unit is communicated with a secondary side heat exchange pipeline of the heat exchanger assembly, the other end of the heat pump unit is divided into a refrigerating end and a heating end, the refrigerating end and the heating end are both communicated with a cold and heat supply user, the refrigerating end is used for supplying cold for the cold and heat supply user, and the heating end is used for supplying heat for the cold and heat supply user;

one end of the high-temperature heat pump unit is respectively communicated with a secondary side heat exchange pipeline of the heat exchanger assembly and a heating end of the heat pump unit, the other end of the high-temperature heat pump unit is communicated with a cold and heat supply user through a seasonal heat storage tank, the high-temperature heat pump unit is used for storing heat for the seasonal heat storage tank, and the seasonal heat storage tank is used for supplying heat to the cold and heat supply user;

the cross-season cold accumulation tank is communicated with a refrigerating end of the heat pump unit, the other end of the cross-season cold accumulation tank is communicated with a cold and heat supply user, and the cross-season cold accumulation tank is used for supplying cold for the cold and heat supply user; the cooling tower is communicated with the seasonal cold accumulation tank and is used for accumulating cold for the seasonal cold accumulation tank.

2. The system of claim 1, wherein the heat pump system further comprises a constant pressure tank and a domestic hot water user;

domestic water is stored in the constant pressure tank, the input end of the constant pressure tank is communicated with an external water source, the output end of the constant pressure tank is communicated with a domestic hot water user, and the external water source provides domestic water for the domestic hot water user through the constant pressure tank;

the constant pressure tank exchanges heat with a secondary side heat exchange pipeline of the heat exchanger assembly, and the secondary side heat exchange pipeline of the heat exchanger assembly heats domestic water in the constant pressure tank; the constant pressure tank exchanges heat with the seasonal heat storage tank, and the seasonal heat storage tank is crossed to further heat the domestic water in the constant pressure tank.

3. The geothermal water and trans-seasonal energy storage based low energy heat pump system of claim 2, wherein the heat pump system further comprises a valve set, the valve set comprising: the valve comprises a first valve, a second valve, a third valve, a fourth valve, a fifth valve, a sixth valve, a seventh valve, an eighth valve, a ninth valve, a tenth valve, an eleventh valve and a twelfth valve;

the heat exchanger assembly comprises a primary heat exchanger and a secondary heat exchanger;

the refrigerating end of the heat pump unit is an evaporator, and the heating end of the heat pump unit is a condenser;

the geothermal water production well is communicated with the input end of the primary side heat exchange pipeline of the primary heat exchanger through a pipeline, the output end of the primary side heat exchange pipeline of the primary heat exchanger is communicated with the input end of the primary side heat exchange pipeline of the secondary heat exchanger through a pipeline, and the output end of the primary side heat exchange pipeline of the secondary heat exchanger is communicated with the geothermal water recharging well through a pipeline;

the output end of the secondary side heat exchange channel of the primary heat exchanger is communicated with the input end of the cold and heat supply user through a pipeline b;

the output end of a secondary side heat exchange pipeline of the secondary heat exchanger is communicated with a pipeline b through a pipeline e, and the intersection of the pipeline e and the pipeline b is a point G; the input end of a secondary side heat exchange pipeline of the secondary heat exchanger is communicated with a pipeline c through a pipeline f, and the intersection of the pipeline c and the pipeline f is a point H;

a first input end of an evaporator of the heat pump unit is communicated with a pipeline e through a pipeline a, the intersection of the pipeline a and the pipeline e is a point I, and a first output end of the evaporator is communicated with a pipeline f; the second input end of the evaporator is communicated with a pipeline c through a pipeline g, the intersection of the pipeline g and the pipeline c is a K point, the second output end of the evaporator is communicated with a pipeline b through a pipeline d, and the intersection of the pipeline d and the pipeline b is a J point;

the output end of a condenser of the heat pump unit is communicated with a pipeline b through a pipeline h, the intersection of the pipeline h and the pipeline b is an L point, the input end of the condenser is communicated with a pipeline c through a pipeline i, and the intersection of the pipeline i and the pipeline c is an M point;

a heat supply outlet of the cross-season heat storage tank is communicated with a pipeline b through a pipeline k, and the intersection of the pipeline k and the pipeline b is a point A; a heat supply return port of the cross-season heat storage tank is communicated with a pipeline c through a pipeline l, and the intersection of the pipeline l and the pipeline c is a point P;

a heat storage outlet of the cross-season heat storage tank is communicated with a first input end of the high-temperature heat pump unit; the first output end of the high-temperature heat pump unit is communicated with a pipeline c through a pipeline m, and the intersection of the pipeline m and the pipeline c is a Q point; the second input end of the high-temperature heat pump unit is communicated with a pipeline b through a pipeline j, the intersection of the pipeline j and the pipeline b is an N point, and the second output end of the high-temperature heat pump unit is communicated with a heat storage inlet of the cross-season heat storage tank;

a cold supply outlet of the cross-season cold storage tank is communicated with a pipeline b through a pipeline s, the intersection of the pipeline s and the pipeline b is a U point, a cold supply return port of the cross-season cold storage tank is communicated with a pipeline c through a pipeline r, and the intersection of the pipeline r and the pipeline c is a T point;

a cold accumulation outlet of the cross-season cold accumulation tank is communicated with a pipeline g through a pipeline q, a cold accumulation inlet of the cross-season cold accumulation tank is communicated with a pipeline d through a pipeline p, and the intersection of the pipeline p and the pipeline d is an S point; meanwhile, the pipeline q is communicated with the pipeline h through a branch n, the intersection of the branch n and the pipeline h is an R point, and the intersection of the branch n and the pipeline q is an X point; the pipeline p is communicated with the pipeline i through a branch o, and the intersection of the branch o and the pipeline p is a point B;

the cooling tower is respectively communicated with the branch n and the branch o through a pipeline w, namely one end of the pipeline w is communicated with the branch o, the other end of the pipeline w is communicated with the branch n, and the intersection of the pipeline w and the branch n is a Y point; the middle part of the pipeline w flows through a cooling tower, and the cooling tower cools the hot water in the pipeline w;

the pipeline j is communicated with the pipeline n through a branch t, the intersection of the pipeline n and the branch t is a V point, and the intersection of the pipeline j and the branch t is a W point; the pipeline m is communicated with the pipeline o through a branch u;

the first valve is arranged on the pipeline b and is positioned between the N point and the J point; the valve is located on the pipeline j and between the point N and the point W; the valve is positioned on the pipeline e and between the point G and the point I; the fourth valve is positioned on the pipeline a, and the fifth valve is positioned on the pipeline d and positioned between the point S and the point J; the sixth valve is positioned on the pipeline h and between the point R and the point L; a seventh valve, a ninth valve and a tenth valve are all positioned on the pipeline n, the seventh valve is positioned between the R point and the V point, the ninth valve is positioned between the V point and the Y point, and the tenth valve is positioned between the Y point and the X point; the valve is positioned on the pipeline p and is positioned between the point S and the point B; the valve eleven is positioned on the pipeline k and is positioned between the point Z and the point A; valve twelve is located on line s.

4. The geothermal water and trans-seasonal energy storage based low energy heat pump system of claim 3, wherein the valve set further comprises a valve thirteen; the heat exchanger assembly further comprises a tertiary heat exchanger;

the primary side heat exchange pipeline of the tertiary heat exchanger is connected in series between the primary side heat exchange pipeline of the secondary heat exchanger and the geothermal water recharging well, namely the output end of the primary side heat exchange pipeline of the secondary heat exchanger is communicated with the input end of the primary side heat exchange pipeline of the tertiary heat exchanger through a pipeline, and the output end of the primary side heat exchange pipeline of the tertiary heat exchanger is communicated with the geothermal water recharging well through a pipeline;

the output end of the secondary side heat exchange pipeline of the tertiary heat exchanger is communicated with the input end of the secondary side heat exchange pipeline of the tertiary heat exchanger through a pipeline z, the pipeline z flows through the constant pressure tank, and water flowing out of the secondary side heat exchange pipeline of the tertiary heat exchanger heats domestic water in the constant pressure tank through the pipeline z;

the pipeline k and the pipeline l respectively exchange heat with the constant pressure tank through the pipeline y, namely one end of the pipeline y is communicated with the pipeline k, the junction of the pipeline y and the pipeline k is a Z point, the other end of the pipeline y is communicated with the pipeline l, the pipeline y flows through the constant pressure tank, and hot water flowing out of the seasonal heat storage tank further heats domestic water in the constant pressure tank through the pipeline y; the thirteen valves are positioned on the pipeline y.

5. A low energy consumption heat pump system based on geothermal water and energy storage across seasons according to any one of claims 1 to 4 wherein the heat exchanger assembly is a fixed tube plate heat exchanger or a U-shaped tube plate heat exchanger.

6. A method of operating a low energy heat pump system based on geothermal water and cross-season energy storage, the low energy heat pump system according to any of claims 3-5, characterized in that the method comprises two modes of operation, a summer mode of operation and a winter mode of operation, and the switching between the summer mode of operation and the winter mode of operation is achieved by switching the valves in the valve group.

7. The method of claim 6 wherein the system is operated in a geothermal water and trans-seasonal energy storage based low energy heat pump system,

in a summer operation mode, performing heat storage and cold supply, wherein all valves are in a closed state at the beginning of cold supply, firstly opening a valve twelve, connecting a cold supply circulation loop I consisting of a pipe section from a cold supply outlet to a cold supply return port in a cross-season cold storage tank, a pipe section from a U point on a pipeline s, a pipe section from a U point on the pipeline b to a cold and hot supply user and a pipe section from a T point on the pipeline c to a cold and hot supply user, and supplying cold to the cold and hot supply user by using cold energy in the cross-season cold storage tank;

when the cold quantity in the cross-season cold storage tank cannot meet the cold using requirement, closing a valve twelfth, opening a heat pump unit and opening a valve fifth, connecting a cold supply circulation loop second consisting of a pipe section from a second input end and a second output end of an evaporator in the heat pump unit, a pipe section from a J point on a pipeline d, a pipeline g and a pipeline b to a cold and heat supply user and a pipe section from a K point on a pipeline c to the cold and heat supply user, and supplying cold to the cold and heat supply user by using the cold quantity generated by the evaporator of the heat pump unit;

when heat is stored in summer, on the basis of cold supply by the heat pump unit, the high-temperature heat pump unit, the valve II, the valve seventh and the valve ninth are opened, hot water flowing out of a condenser of the heat pump unit and hot water flowing out of a secondary side heat exchange pipeline of the primary heat exchanger are mixed in the high-temperature heat pump unit, the temperature of the mixed hot water is raised by the high-temperature heat pump unit, the mixed hot water is communicated with the season-crossing heat storage tank, and heat is stored in the season-crossing heat storage tank; the mode simultaneously recovers the heat of a condenser of the heat pump unit and extracts partial heat in geothermal water of the geothermal water exploitation well; when the cross-season heat storage tank reaches the heat storage limit, the redundant heat generated by a condenser in the heat storage heat pump unit is discharged through the cooling tower;

in the whole process of heat storage and cold supply in summer, geothermal water flows out of the geothermal water production well, and flows into the geothermal water recharging well after being subjected to heat exchange and temperature reduction through the primary heat exchanger, the secondary heat exchanger and the tertiary heat exchanger in sequence;

when domestic water needs to be provided for domestic hot water users, water flowing out of the secondary side heat exchange pipeline of the tertiary heat exchanger heats the domestic water in the constant pressure tank through a pipeline z, and the domestic water with the set temperature is output to the domestic hot water users after the temperature of the domestic water in the constant pressure tank reaches the set temperature; when the domestic water in the constant pressure tank cannot be heated to the set temperature only by the three-stage heat exchanger, the valve thirteen is opened, the domestic water in the constant pressure tank is mixed with the hot water discharged from the heat supply outlet of the seasonal heat storage tank, and the mixed water is further heated and then output to provide domestic water with the set temperature for domestic hot water users.

8. The operation method of the low-energy-consumption heat pump system based on geothermal water and cross-season energy storage is characterized in that when a heat pump unit is used for cooling, a valve eight is opened at a valley section, and a cold storage loop consisting of a pipe section of a second input end and a second output end of an evaporator in the heat pump unit, a pipe p, a pipe q and a pipe section between a cold storage inlet and a cold storage outlet in a cross-season cold storage tank is communicated; cold energy generated by an evaporator of the heat pump unit is used for cold accumulation of the season-crossing cold accumulation tank; and (4) closing the heat pump unit in the peak period of power utilization, opening a valve twelve, and only using the seasonal cold storage tank for cold supply.

9. The method as claimed in claim 6, wherein in the winter operation mode, cool storage and heat supply are performed, and when heat supply is performed in winter, user load is divided into load classes, i.e. primary load in the initial stage of heat supply and secondary load when outdoor temperature is lowered and heat supply load is raised; when the outdoor temperature is further reduced and the heating load is increased again, the load is a three-level load; when the heating load reaches the peak value, the load is a four-stage load; the specific operation flow of heat supply is as follows:

when the heat supply is started, all valves are in a closed state, and when the primary load is carried out, the first valve is opened, the primary heat exchanger is used for directly supplying heat, namely, a heat supply circulation loop I formed by a secondary side heat exchange pipeline, a pipeline b, a pipeline c and a cold and heat supply user of the primary heat exchanger is communicated, and the primary heat exchanger realizes the direct heat supply of the cold and heat supply user by the heat exchange with geothermal water flowing out of a geothermal water production well; simultaneously starting the high-temperature heat pump unit and the valve II, and utilizing geothermal water to store heat for the seasonal heat storage tank;

when the secondary load is carried out, a third valve is opened, and a mode of combined heating of a primary heat exchanger and a secondary heat exchanger is adopted, namely a first heat supply circulation loop formed by a secondary side heat exchange pipeline, a pipeline b, a pipeline c and a cold and heat supply user of the primary heat exchanger is communicated, a second heat supply circulation loop formed by a pipeline section from a G point on the secondary side heat exchange pipeline, a pipeline e, a pipeline f and the pipeline b to the cold and heat supply user and a pipeline section from an H point on the pipeline c to the cold and heat supply user of the secondary heat exchanger is communicated, and the primary heat exchanger and the secondary heat exchanger realize the combined heating of the cold and heat supply user through heat exchange with geothermal water flowing out of a geothermal water production well respectively;

when the three-stage load is carried out, a first valve is opened, a second valve is closed, a combined heating mode of geothermal water and a seasonal heat storage tank is adopted, namely a first heating circulation loop formed by a secondary side heat exchange pipeline of a primary heat exchanger, a pipeline b, a pipeline c and a cooling and heating user is connected, a second heating circulation loop formed by a pipeline section from a G point on the secondary side heat exchange pipeline of the secondary heat exchanger, a pipeline section from a pipeline e, a pipeline f and a pipeline b to a cooling and heating user and a pipeline section from an H point on the pipeline c to a cooling and heating user is connected, a third heating circulation loop formed by a pipeline section between a heat supply outlet and a heat supply return port in the seasonal heat storage tank, a pipeline k, a pipeline l, a pipeline section from a point A on the pipeline b to the cooling and heating user and a pipeline section from a point P point on the pipeline c to the cooling and heating user are connected, and the primary heat exchanger and the secondary heat exchanger are respectively connected through heat exchange with geothermal water flowing out of an geothermal water production well and heat supplied by the seasonal heat storage tank, so as to realize combined heating of the cooling and heating users;

when the four-stage load is carried out, a valve IV and a valve VI are opened, the heat pump unit starts to operate, and the geothermal water direct supply, the cross-season heat storage tank and the heat pump unit combined heating mode are utilized, namely, a first heating circulation loop formed by a secondary side heat exchange pipeline, a pipeline b, a pipeline c and cooling and heating users of the primary heat exchanger is communicated, a second heating circulation loop formed by a secondary side heat exchange pipeline, a pipeline e, a pipeline f, a pipeline G point on the pipeline b to a pipe section between the cooling and heating users and a pipe section formed by an H point on the pipeline c to the pipe section between the cooling and heating users of the secondary heat exchanger is communicated, a heat supply circulation loop formed by a pipe section between a heat supply outlet and a heat supply return port in the cross-season heat storage tank, a pipe section k between a pipe L and a pipe b and a pipe section between a point A on the pipe b and a cold and heat supply user, and a pipe section between a point P on the pipe c and a cold and heat supply user is switched on, a heat supply circulation loop formed by a condenser of the heat pump unit, a pipe i, a pipe H, a pipe section between a point L on the pipe b and a cold and heat supply user and a pipe section between a point M on the pipe c and a cold and heat supply user are switched on, and the primary heat exchanger and the secondary heat exchanger are respectively switched on through heat exchange with geothermal water flowing out from a geothermal water production well, heat provided by the cross-season heat storage tank and heat provided by the condenser of the heat pump unit, so as to realize combined heat supply for the cold and heat supply users;

when cold accumulation is carried out in winter, opening a valve ten, connecting a cooling tower with the seasonal cold accumulation tank, and adding an antifreezing agent into a loop circulating medium consisting of the cooling tower and the seasonal cold accumulation tank; the cooling tower collects the cold energy of the outside air and transmits the cold energy to the season-crossing cold storage tank for cold storage for summer cold supply;

in the whole process of cold accumulation and heat supply in winter, geothermal water flows out of the geothermal water production well, and flows into the geothermal water recharging well after being subjected to heat exchange and temperature reduction through the primary heat exchanger, the secondary heat exchanger and the tertiary heat exchanger in sequence;

when domestic water needs to be provided for domestic hot water users, water flowing out of the secondary side heat exchange pipeline of the tertiary heat exchanger heats the domestic water in the constant pressure tank through a pipeline z, and the domestic water with the set temperature is output to the domestic hot water users after the temperature of the domestic water in the constant pressure tank reaches the set temperature; when the domestic water in the constant-pressure tank cannot be heated to the set temperature only by the three-stage heat exchanger, the valve thirteen is opened, the domestic water in the constant-pressure tank is mixed with the hot water discharged from the heat supply outlet of the cross-season heat storage tank, and the mixed hot water is further heated and then is output to provide domestic hot water at the set temperature for domestic hot water users.

10. The operating method of claim 9, wherein when the heat pump unit is used for heating, a seventh valve is opened at a valley section to communicate a condenser of the heat pump unit with the cross-season heat storage tank, and heat generated by the condenser of the heat pump unit is used for storing heat in the cross-season heat storage tank.

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