CN117029079A - Energy-saving low-carbon type backwater source heat pump system based on central heating backwater - Google Patents

Abstract

The invention belongs to the technical field of heating heat pumps, and relates to an energy-saving low-carbon type backwater source heat pump system based on central heating backwater, which comprises the following components: the invention uses the heat in the heating backwater as the heat source of the heat pump system by recovering the heat in the heating backwater, thereby reducing the consumption of energy sources, improving the energy utilization efficiency and enabling users with different heating temperature requirements to be satisfied by matching heating equipment in various heating modes.

Description

An energy-saving and low-carbon return water source heat pump system based on central heating return water

Technical field

The invention belongs to the technical field of heating heat pumps and relates to an energy-saving and low-carbon return water source heat pump system based on centralized heating return water.

Background technique

Existing heating methods include: water source heat pumps, water source heat pump systems with heat recovery and utilization, centralized heating systems, and controlled heating systems: intelligent control systems that can automatically adjust the heating of the water source heat pump system according to the user's indoor temperature and external temperature. temperature. The existing heating methods all have different shortcomings, specifically as follows:

The existing centralized heating system has poor adjustment flexibility, high heating energy consumption, and prominent ineffective heat. A step-by-step heating system is proposed that uses central heating to ensure basic room temperature and returns water source heat pump heating to meet individual standards.

Existing heat pump systems mainly use low-grade heat sources such as air, lake water (seawater), ground sources, and sewage. The heat source of the return water source heat pump (the return water from central heating) can stably reach about 25 degrees, making the system more stable and with a higher COP. .

In severe cold areas, existing heat pump systems will reduce heating efficiency and outlet water temperature due to lower outdoor temperatures in winter.

Restricted by water source conditions: Water source heat pump systems require reliable water supply, such as lakes, rivers, groundwater, etc. If the surrounding environment lacks a suitable water source, or the water source is of poor quality, it will adversely affect the operation of the system.

High installation and maintenance costs: The installation of water source heat pump systems is relatively complex and requires drilling wells for installation. Additionally, treatment and protection of water sources require additional costs and efforts.

Fluctuations in water source temperature affect system performance: The performance of a water source heat pump system is directly affected by the water source temperature. If the temperature of the water source fluctuates greatly or is under extreme weather conditions, the heating or cooling effect of the system may be affected, resulting in reduced system performance.

Impact on the water environment: The water source heat pump system needs to extract or discharge heat from the water, which may have a certain impact on the water environment. For example, extracting heat from water in winter can cause water temperatures to drop, affecting aquatic life. Proper environmental impact assessment and management are important for the sustainable operation of water source heat pump systems.

Therefore, a heating system that is energy-saving, efficient, low-carbon, environmentally friendly, highly resource efficient, and operates stably is needed to solve the above problems.

Contents of the invention

The technical solution adopted by the present invention to solve the technical problem is: an energy-saving and low-carbon return water source heat pump system based on central heating return water, including: a central heating station, an indoor first radiator, a first three-way valve, a second Three-way valve, first heat exchanger, second heat exchanger, indoor second radiator, water pump, electric heater, the centralized heat source outlet of the centralized heating station is connected to the water inlet of the first indoor radiator, and the indoor second radiator The water outlet of a radiator is connected to the second three-way valve through the first three-way valve, and the second three-way valve is connected to the centralized heat source return port of the centralized heating station;

The first three-way valve is connected to the water inlet at the main end of the first heat exchanger, and the water outlet at the main end of the first heat exchanger is connected to the second three-way valve;

The slave end of the first heat exchanger is in heat exchange communication with the main end of the second heat exchanger to transfer heat from the first heat exchanger to the second heat exchanger;

The water outlet at the slave end of the second heat exchanger is connected to the water inlet of the water pump. The water outlet of the water pump is connected to the water inlet of the second indoor radiator. The water outlet of the second indoor radiator is connected to the water inlet at the slave end of the second heat exchanger. ;

The water inlet of the second indoor radiator is connected to the water outlet of the electric heater, and the water outlet of the second indoor radiator is connected to the water inlet of the electric heater.

Preferably, a first solenoid valve is connected in series between the water outlet of the centralized heat source of the centralized heating station and the water inlet of the first indoor radiator, and between the water outlet of the second indoor radiator and the water inlet of the electric heater. There is also a second solenoid valve connected in series; through the first solenoid valve and the second solenoid valve, the switch and flow rate of the centralized heating station's heat supply to the first indoor radiator can be controlled respectively, and the electric heater's heat supply to the second indoor radiator can be controlled. switch and flow rate to select different heating modes.

More preferably, the communication method for heat exchange between the slave end of the first heat exchanger and the main end of the second heat exchanger includes: the slave outlet of the first heat exchanger is connected to the water inlet of the evaporator, and the evaporator is connected to the water inlet of the evaporator. The water outlet is connected to the slave-end water inlet of the first heat exchanger, the main-end water outlet of the second heat exchanger is connected to the water inlet of the condenser, and the water outlet of the condenser is connected to the main-end water inlet of the second heat exchanger. ; A compressor is connected in series on the heat transfer pipeline that circulates from the evaporator to the condenser, and an expansion valve is connected in series on the heat return pipeline that circulates from the condenser to the evaporator; the water entering the main end of the second heat exchanger can be reheated through the compressor. The heating temperature of the second indoor radiator is guaranteed.

More preferably, the operating modes of the heat pump system include: central heating mode, two-stage heating mode, two-stage heating mode with electric heating auxiliary heating turned on, and only electric heating heating mode turned on; the centralized heating mode is : The central heating station only supplies heat to the first indoor radiator; the two-stage heating mode is: while the central heating station supplies heat to the first indoor radiator, the central heating station also supplies heat to the first heat exchanger and the third indoor radiator. The second heat exchanger indirectly supplies heat to the second indoor radiator; the two-stage heating mode with electric heating auxiliary heating turned on is: the central heating station directly supplies heat to the first indoor radiator, and indirectly supplies heat to the second indoor radiator. At the same time, the electric heater also supplies heat to the second radiator in the room; the mode of only turning on the electric heating is: the central heating station stops supplying heat, and only the electric heater supplies heat to the second radiator in the room; different modes The combination of the following equipment can meet the functional requirements of various temperature layers according to different needs.

More preferably, in the centralized heating mode, the first solenoid valve is turned on, and the compressor, expansion valve, water pump, second solenoid valve, and electric heater are all turned off; in the two-stage heating mode, the first solenoid valve, compression The machine, expansion valve, and water pump are all turned on, and the second solenoid valve and electric heater are turned off; when the two-stage heating mode of electric heating auxiliary heating is turned on, the first solenoid valve, compressor, expansion valve, water pump, and second solenoid valve The valve and electric heater are both turned on; when only the electric heating heating mode is turned on, the first solenoid valve, compressor, expansion valve, and water pump are all closed, the centralized heating station stops heating, and the second solenoid valve and electric heater are turned on. .

Preferably, a first temperature sensor is provided at the water inlet of the first indoor radiator, a second temperature sensor is provided at the return water inlet of the centralized heat source, and a third temperature sensor is provided at the water inlet of the main end of the first heat exchanger. , a fourth temperature sensor is provided at the water outlet of the second indoor radiator; the data collection of multiple temperature sensors and the use of solenoid valves can facilitate heating users to remotely control, preset control or program control of each equipment as needed. The switch starts and stops to meet different heating needs.

The beneficial effects of the present invention are:

1. Energy saving and high efficiency: This invention reduces energy consumption by recovering the heat in the return water and using it as the heat source of the heat pump system. The low-temperature heat in the return water can be absorbed and heated by the return water source heat pump and used in the heating system, improving energy efficiency.

2. Low-carbon and environmentally friendly: Since the return water source heat pump of the present invention utilizes the heat in the return water, it reduces dependence on traditional energy and reduces greenhouse gas emissions and environmental pollution. It's a greener, low-carbon heating option that helps reduce carbon emissions.

3. Resource utilization: The return water source heat pump system of the present invention effectively utilizes the waste heat resources in the return water, fully utilizes the heat energy recovery in the heating process, and reduces energy waste.

4. Stable operation: The water return source heat pump system of the present invention can provide heat more stably during the heating process, reducing the problems of temperature fluctuations and temperature unevenness, and improving the comfort of the heating system.

5. Sustainable development: The operation of the system of the present invention is in line with the principle of sustainable development, converting waste heat into usable energy, extending the service life of the energy, and helping to reduce energy consumption and environmental load.

Description of the drawings

Figure 1 is a schematic diagram of an energy-saving and low-carbon return water source heat pump system based on central heating return water;

Figure 2 is a diagram of the central heating mode;

Figure 3 is a two-stage heating mode diagram;

Figure 4 is a two-stage heating mode diagram with electric heating auxiliary heating turned on at the end;

Figure 5 is a diagram showing only the electric heating heating mode.

Among them, 1. Central heating station; 2. The first indoor radiator; 3. The first solenoid valve; 4. The first three-way valve; 5. The second three-way valve; 6. The first heat exchanger; 7. Compressor; 8. Expansion valve; 9. Condenser; 10. Evaporator; 11. Second heat exchanger; 12. Centralized heat source outlet; 13. Centralized heat source return outlet; 14. First temperature sensor; 15. No. Two temperature sensors; 16. The third temperature sensor; 17. The second indoor radiator; 18. Water pump; 19. The fourth temperature sensor; 20. The second solenoid valve; 21. Electric heater.

Detailed ways

The related technologies in the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

Referring to Figure 1-5, an energy-saving and low-carbon return water source heat pump system based on central heating return water includes: central heating station 1, indoor first radiator 2, first three-way valve 4, and second three-way valve 5. The first heat exchanger 6, the second heat exchanger 11, the second indoor radiator 17, the water pump 18, the electric heater 21, the centralized heat source outlet 12 of the central heating station 1 is connected to the first indoor radiator 2 The water inlet of the first indoor radiator 2 is connected to the second three-way valve 5 through the first three-way valve 4, and the second three-way valve 5 is connected to the centralized heat source return port 13 of the centralized heating station 1;

The first three-way valve 4 is connected to the water inlet at the main end of the first heat exchanger 6, and the water outlet at the main end of the first heat exchanger 6 is connected to the second three-way valve 5;

The slave end of the first heat exchanger 6 is in heat exchange communication with the main end of the second heat exchanger 11 to transfer the heat from the first heat exchanger 6 to the second heat exchanger 11;

The water outlet at the secondary end of the second heat exchanger 11 is connected to the water inlet of the water pump 18. The water outlet of the water pump 18 is connected to the water inlet of the second indoor radiator 17. The water outlet of the indoor second radiator 17 is connected to the second heat exchanger. The water inlet at the slave end of device 11;

The water inlet of the second indoor radiator 17 is connected to the water outlet of the electric heater 21 , and the water outlet of the second indoor radiator 17 is connected to the water inlet of the electric heater 21 .

Furthermore, a first solenoid valve 3 is connected in series between the centralized heat source outlet 12 of the centralized heating station 1 and the water inlet of the first indoor radiator 2, and the water outlet of the second indoor radiator 17 is connected to the electric heater. There is also a second solenoid valve 20 connected in series between the water inlets of 21; through the first solenoid valve 3 and the second solenoid valve 20, the switch and flow rate of the central heating station 1 to the indoor first radiator 2 can be controlled respectively. The electric heater 21 switches on and off the heat supply to the indoor second radiator 17 and the flow rate, thereby selecting different heating modes.

Furthermore, the communication method for heat exchange between the slave end of the first heat exchanger 6 and the main end of the second heat exchanger 11 includes: the slave outlet of the first heat exchanger 6 is connected to the water inlet of the evaporator 10 , the water outlet of the evaporator 10 is connected to the slave-end water inlet of the first heat exchanger 6, the main-end water outlet of the second heat exchanger 11 is connected to the water inlet of the condenser 9, and the water outlet of the condenser 9 is connected to the third water inlet. The main end water inlet of the second heat exchanger 11; a compressor 7 is connected in series on the heat transfer pipeline from the evaporator 10 to the condenser 9, and an expansion valve 8 is connected in series to the heat recovery pipeline from the condenser 9 to the evaporator 10; through the compressor 7. The water entering the main end of the second heat exchanger 11 can be reheated to ensure the heating temperature of the second radiator 17 in the room.

Furthermore, the operating modes of the heat pump system include: centralized heating mode, two-stage heating mode, two-stage heating mode with electric heating auxiliary heating turned on, and only electric heating heating mode turned on; the centralized heating mode is : The central heating station 1 only supplies heat to the first indoor radiator 2; the two-stage heating mode is: while the central heating station 1 supplies heat to the first indoor radiator 2, the central heating station 1 also supplies heat to the first indoor radiator 2. The heat exchanger 6 and the second heat exchanger 11 indirectly supply heat to the second indoor radiator 17; the two-stage heating mode that turns on the electric heating auxiliary heating is: the central heating station 1 directly supplies heat to the first indoor radiator. 2. While indirectly supplying heat to the second indoor radiator 17, the electric heater 21 also supplies heat to the second indoor radiator 17; only turning on the electric heating heating mode is: the central heating station 1 stops supplying heat, and only The electric heater 21 supplies heat to the second indoor radiator 17; the combination of each device in different modes can meet the functional requirements of various temperature levels according to different needs.

Furthermore, in the centralized heating mode, the first solenoid valve 3 is opened, and the compressor 7, expansion valve 8, water pump 18, second solenoid valve 20, and electric heater 21 are all closed; in the two-stage heating mode, The first solenoid valve 3, compressor 7, expansion valve 8, and water pump 18 are all open, and the second solenoid valve 20 and electric heater 21 are all closed; when the two-stage heating mode of electric heating auxiliary heating is turned on, the first solenoid valve 3. Compressor 7, expansion valve 8, water pump 18, second solenoid valve 20, and electric heater 21 are all turned on; when only the electric heating mode is turned on, first solenoid valve 3, compressor 7, expansion valve 8, and water pump 18 are closed, the central heating station 1 stops heating, and the second solenoid valve 20 and the electric heater 21 are both opened.

Furthermore, a first temperature sensor 14 is provided at the water inlet of the first indoor radiator 2, a second temperature sensor 15 is provided at the water return port 13 of the centralized heat source, and a water inlet at the main end of the first heat exchanger is provided. The third temperature sensor 16 and the fourth temperature sensor 19 are provided at the water outlet of the second indoor radiator 17; the data collection of multiple temperature sensors and the use of solenoid valves can facilitate heating users to remotely control and preset as needed Control or program the start and stop of each device to meet different heating needs.

Example

This embodiment provides a water source heat pump system based on central heating water return. Through the central heating water outlet pipe connected to the inlet end of the evaporator 10, the central heating return water pipe to the heating station is connected to the outlet end of the evaporator 10. ;The winter radiator/other forms of distributed heating terminal return water pipes connected to the inlet end of condenser 9, the winter radiator/other forms of distributed heating terminal water supply pipes connected to the outlet end of condenser 9 Road, this embodiment uses the return water from central heating as the heat source of the water source heat pump unit to provide the heat source for terminal equipment in winter, reduce the use of heat sources such as boilers in winter, and save energy consumption in building operations.

Operation mode one, centralized heating mode, as shown in Figure 2: When there are no fixed personnel in the indoor space or the personnel do not intend to raise the room temperature above the thermal safety temperature (16°C), the user uses the centralized heating mode;

Operation mode two, two-stage heating mode, as shown in Figure 3: When the occupant wants to increase the room temperature by more than 16°C, and the outlet water temperature in the room is less than or equal to the water temperature provided by central heating, the user uses the two-stage heating mode. ;

Operation mode three, the two-stage heating mode with electric heating auxiliary heating turned on at the end, as shown in Figure 4: When the occupant wants to increase the room temperature by more than 16°C, and the outlet water temperature of the room is less than or equal to the water temperature provided by central heating , the user uses the two-stage heating mode. If the user-set temperature is not reached, the electric heating auxiliary heating is turned on at the end;

Operation mode four, only the electric heating mode is turned on, as shown in Figure 5: When the occupant wants to increase the room temperature by more than 16°C, and the user chooses to use only electric heating for heating.

The heat source used in this embodiment is return water from central heating, or relatively stable industrial hot waste water can also be used.

The equipment at the heating end of this embodiment can be in various forms.

This embodiment effectively reduces the operating costs of the building's heating system in winter and reduces the operating energy consumption of central heating boiler equipment. This embodiment is a transition form from traditional fossil energy centralized heating to comprehensive green electricity distributed heating. Compared with the traditional centralized full-stage high-energy consumption and high-temperature heating, this embodiment adopts the concept of centralized low-energy consumption and low-temperature operation, and uses return water source heat pump equipment to increase the heating temperature for users with higher heat load needs and reduce the waste of ineffective heat. The water source heat pump system in this embodiment can use underground pipes or lake water or sewage to obtain and release heat, or it can not use a water source heat pump system and use conventional boilers to provide heat for air conditioning in winter, which requires an increase in corresponding equipment investment. This embodiment uses the recovery of central heating. Water serves as the heat source of the water source heat pump system, reducing equipment investment. This embodiment reduces emissions from boilers and the like in winter, and has obvious energy saving and emission reduction effects.

In summary, the present invention reduces energy consumption and improves energy utilization efficiency by recovering heat from the heating return water and using it as the heat source of the heat pump system. Through the cooperation of heating equipment in multiple heating modes, different heating temperatures can be achieved. Users with heating needs can be satisfied. Therefore, the present invention has broad application prospects.

It should be emphasized that the above are only preferred embodiments of the present invention and do not limit the present invention in any form. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are It still falls within the scope of the technical solution of the present invention.

Claims (6)

1. Energy-conserving low carbon return water source heat pump system based on central heating return water, characterized by comprising: the heat source water outlet (12) of the central heating station (1) is communicated with the water inlet of the indoor first radiator (2), the water outlet of the indoor first radiator (2) is communicated with the second three-way valve (5) after passing through the first three-way valve (4), and the second three-way valve (5) is communicated with the central heat source water return port (13) of the central heating station (1);

the first three-way valve (4) is communicated with a water inlet at the main end of the first heat exchanger (6), and a water outlet at the main end of the first heat exchanger (6) is communicated with the second three-way valve (5);

the slave end of the first heat exchanger (6) is in heat exchange communication with the master end of the second heat exchanger (11) to transfer heat at the first heat exchanger (6) to the second heat exchanger (11);

the water outlet of the secondary heat exchanger (11) is communicated with the water inlet of the water pump (18), the water outlet of the water pump (18) is communicated with the water inlet of the indoor secondary radiator (17), and the water outlet of the indoor secondary radiator (17) is communicated with the water inlet of the secondary end of the secondary heat exchanger (11);

the water inlet of the indoor second radiator (17) is communicated with the water outlet of the electric heater (21), and the water outlet of the indoor second radiator (17) is communicated with the water inlet of the electric heater (21).

2. The energy-saving low-carbon type backwater source heat pump system based on central heating backwater according to claim 1, wherein a first electromagnetic valve (3) is further connected in series between a central heat source water outlet (12) of the central heating station (1) and a water inlet of the indoor first radiator (2), and a second electromagnetic valve (20) is further connected in series between a water outlet of the second radiator (17) and a water inlet of the electric heater (21).

3. An energy-saving low-carbon type backwater source heat pump system based on central heating backwater according to claim 2, wherein the communication mode of the heat exchange of the slave end of the first heat exchanger (6) with the master end of the second heat exchanger (11) comprises: the secondary end water outlet of the first heat exchanger (6) is communicated with the water inlet of the evaporator (10), the water outlet of the evaporator (10) is communicated with the secondary end water inlet of the first heat exchanger (6), the main end water outlet of the second heat exchanger (11) is communicated with the water inlet of the condenser (9), and the water outlet of the condenser (9) is communicated with the main end water inlet of the second heat exchanger (11); the heat transfer pipeline of the evaporator (10) to the condenser (9) is connected with a compressor (7) in series, and the heat return pipeline of the condenser (9) to the evaporator (10) is connected with an expansion valve (8) in series.

4. An energy-saving low-carbon type backwater source heat pump system based on central heating backwater as claimed in claim 3, wherein the operation modes of the heat pump system comprise: a central heating mode, a two-section heating mode for starting electric heating auxiliary heating, and a heating mode for starting electric heating only; the central heating mode is as follows: the central heating station (1) only supplies heat to the indoor first radiator (2); the two-stage heating mode is as follows: the central heating station (1) supplies heat to the indoor first radiator (2) and simultaneously, the central heating station (1) also indirectly supplies heat to the indoor second radiator (17) through the first heat exchanger (6) and the second heat exchanger (11); the two-section heating mode for starting electric heating auxiliary heating is as follows: the central heating station (1) directly supplies heat to the indoor first radiator (2) and indirectly supplies heat to the indoor second radiator (17), and the electric heater (21) also supplies heat to the indoor second radiator (17); the mode of only starting the electric heating and heat supplying is as follows: the central heating station (1) stops heating and only the electric heater (21) supplies heat to the second radiator (17).

5. The energy-saving low-carbon type backwater source heat pump system based on central heating backwater according to claim 4, wherein in the central heating mode, the first electromagnetic valve (3) is opened, and the compressor (7), the expansion valve (8), the water pump (18), the second electromagnetic valve (20) and the electric heater (21) are all closed; in the two-stage heating mode, the first electromagnetic valve (3), the compressor (7), the expansion valve (8) and the water pump (18) are all opened, and the second electromagnetic valve (20) and the electric heater (21) are all closed; in the two-stage heating mode of starting electric heating auxiliary heating, the first electromagnetic valve (3), the compressor (7), the expansion valve (8), the water pump (18), the second electromagnetic valve (20) and the electric heater (21) are all started; when the electric heating mode is only started, the first electromagnetic valve (3), the compressor (7), the expansion valve (8) and the water pump (18) are all closed, the central heating station (1) stops heating, and the second electromagnetic valve (20) and the electric heater (21) are all opened.

6. The energy-saving low-carbon type backwater source heat pump system based on central heating backwater according to claim 1, wherein a first temperature sensor (14) is arranged at a water inlet of the indoor first radiator (2), a second temperature sensor (15) is arranged at a water return port (13) of the central heat source, a third temperature sensor (16) is arranged at a water inlet of a main end of the first heat exchanger, and a fourth temperature sensor (19) is arranged at a water outlet of the indoor second radiator (17).