CN113221315B - Construction of seawater source heat pump system unit design and selection method and system - Google Patents

Abstract

The invention discloses an equipment model selection method and an equipment model selection system for constructing a seawater source heat pump system, belongs to the technical field of seawater source heat pump systems, comprehensively considers the resistance-capacitance characteristics of building envelope structures and various internal heat accumulators, constructs a building resistance-capacitance model, and grasps the thermal process energy flow response characteristics of a building subsystem under the action of outdoor meteorological conditions. The resistance-capacitance characteristics of the water-taking and heat-exchanging subsystem at the front end of the seawater source heat pump are analyzed, a resistance-capacitance model is built, and the thermal process energy flow response characteristics of the subsystem under the action of seawater weather conditions are mastered. The asynchronous cooperation between the seawater temperature and the atmospheric temperature is considered to coordinate the thermal process energy flow response characteristics of the building and the front terminal system, the heat pump equipment design selection method is further refined, reasonable matching of equipment with building loads is achieved, and the system operation efficiency is improved.

Description

Construction of seawater source heat pump system unit design and selection method and system

technical field

The invention belongs to the technical field of seawater source heat pump systems, and in particular relates to a design and type selection method and system for building a seawater source heat pump system unit.

Background technique

The statements herein merely provide background information related to the present invention and do not necessarily constitute prior art.

Reasonable selection of equipment in the design stage of air conditioning system has always been regarded as an effective method to improve system operation efficiency. Especially for cold (heat) source units, whether the selection is reasonable or not will not only affect the use effect of the air conditioning system, but more importantly, affect the operating economy. Improper selection will cause unnecessary waste and increase management difficulties. Since the 1980s, my country has successively promulgated a series of building energy-saving standards, including "Code for Design of Heating, Ventilation and Air Conditioning in Civil Buildings" GB50736, "Design Standards for Energy Conservation of Public Buildings" GB50189, "Standards for Testing Energy Conservation of Public Buildings" JGJ-T 177 and other standards, these standards have made clear regulations on the selection and configuration of building air-conditioning cold (heat) source units. The traditional selection method of the cooling (heating) source unit of the air-conditioning system is to multiply the maximum cooling (heating) load of the building by a safety factor as the design load of the air-conditioning system.

However, the inventor found that the load calculation method in my country's current design codes does not fully grasp the energy flow response characteristics of the building thermal process, and does not take into account the outdoor air temperature harmonic function that mainly affects the building load and the seawater source front-end heat exchanger. The asynchronicity between the seawater temperature harmonic functions of the heat, and the response characteristics of the energy flow in the thermal process of the building and the front-end heat exchanger have not been fully grasped, so that the problem of excessive equipment design and selection will inevitably occur, resulting in long-term equipment The time is in the partial load operation state, and the system operation efficiency decreases.

Contents of the invention

Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide a method and system for equipment selection of a seawater source heat pump system, which fully considers the resistance-capacitance characteristics of the building envelope and various internal heat storage bodies, Build a building resistance-capacitance model to grasp the energy flow response characteristics of the building subsystem in the thermal process under the action of outdoor meteorological conditions. The resistance-capacitance characteristics of the front-end water intake heat exchange subsystem of the seawater source heat pump are analyzed and the resistance-capacity model is constructed to grasp the energy flow response characteristics of the subsystem in the thermal process under the action of seawater meteorological conditions. Considering the asynchronous relationship between seawater temperature and atmospheric air temperature in conjunction with the energy flow response characteristics of the thermal process of the building and the front-end subsystem, the design and selection method of the heat pump equipment is further refined to achieve a reasonable match between the equipment and the building load and improve the operating efficiency of the system.

In order to achieve the above object, the present invention is achieved through the following technical solutions:

In the first aspect, the technical solution of the present invention provides a method for designing and selecting a seawater source heat pump system, including the following steps:

Obtain the hourly atmospheric temperature and shallow water temperature parameters of the meteorological year;

Build a resistance-capacitance calculation model;

Based on the obtained temperature harmonic function, the resistance-capacitance calculation model outputs the harmonic function of supply and demand energy flow in the heat exchange heat process to coordinate the response characteristics of the supply and demand energy flow harmonic function in the heat exchange process;

According to the harmonic function of supply and demand energy flow in the heat exchange process, with the optimization goal of minimizing the deviation between the power of the unit and the expected value, the model and number of the selected water source heat pump units are output.

In the second aspect, the technical solution of the present invention also provides a system for constructing a seawater source heat pump system, which includes the following modules, and cascade actions between modules:

A first module configured to obtain hourly atmospheric temperature and shallow water temperature parameters for a meteorological year;

The second module is configured to construct a resistance-capacitance calculation model;

The third module is configured to output the supply and demand energy flow harmonic function of the heat exchange heat process according to the acquired temperature harmonic function so as to cooperate with the response characteristics of the supply and demand energy flow harmonic function of the heat exchange process;

The fourth model is configured to output the selected water source heat pump unit model and number according to the harmonic function of supply and demand energy flow in the heat exchange process, with the optimization goal of minimizing the deviation between the unit power and the expected value.

In the third aspect, the technical solution of the present invention also provides a computer-readable storage medium, in which a plurality of instructions are stored, and the instructions are suitable for being loaded by the processor of the terminal device and executing the construction described in the first aspect. Seawater source heat pump system unit design and selection method.

In the fourth aspect, the technical solution of the present invention also provides a terminal device, including a processor and a computer-readable storage medium, the processor is used to implement various instructions; the computer-readable storage medium is used to store multiple instructions, and the instructions are suitable for The processor loads and executes a method for designing and selecting units for constructing seawater source heat pump systems described in the first aspect.

In the fifth aspect, the technical solution of the present invention also provides a seawater source heat pump system, which implements the design and selection method for building a seawater source heat pump system unit as described in the first aspect;

or,

Including a system for constructing a seawater source heat pump system as described in the second aspect;

or,

Including the computer-readable storage medium as described in the third aspect;

or,

It includes the terminal device as described in the fourth aspect.

The working principle of the present invention is that, considering the resistance-capacitance characteristics of seawater, the seawater temperature harmonic function has a certain amplitude attenuation and phase delay relative to the atmospheric temperature harmonic function. Due to the delay and attenuation between the harmonic functions of the atmosphere, seawater and seabed temperature, seawater source heat pumps that directly extract water for heat exchange or seawater-soil dual source heat pumps that use heat exchangers buried in the seabed as front-end heat exchangers In the thermal process of the whole system, in a year, the energy flow required by the building subsystem affected by the atmospheric temperature is the largest, not the time when the energy flow supplied by the front-end water intake heat exchange subsystem is the smallest. It can be seen that due to the difference in resistance-capacity characteristics of the seawater source heat pump or seawater-soil dual-source heat pump system building and the front-end water intake heat exchanger subsystem, the energy flow harmonic function phase of the two subsystems in response to the thermal effect of atmospheric temperature has different phases. synchronicity. Cooperating with this asynchrony can reduce the installed capacity of the heat pump unit during design and operation.

The beneficial effects of the above-mentioned technical solution of the present invention are as follows:

1) The present invention considers the resistance-capacitance characteristics of seawater, and the seawater temperature harmonic function has a certain amplitude attenuation and phase delay relative to the atmospheric temperature harmonic function. In the present invention, this delay is used to further guide the seawater source heat pump or seawater- The specific selection of the soil dual-source heat pump unit can reduce the installed capacity of the system.

2) In the present invention, all kinds of heat storage bodies inside the building are considered, and the energy flow response characteristics of the front-end water intake and heat exchange process of the building and the seawater source heat pump are fully grasped, and the energy flow response characteristics of the two subsystems are coordinated to further refine the equipment selection method to improve system efficiency.

Description of drawings

The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention, and the schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations to the present invention.

Fig. 1 is a statistical graph of an average air temperature curve and an average water temperature curve according to one or more embodiments of the present invention.

In order to show the position of each part, the distance or size between each part is exaggerated, and the schematic diagram is only used for illustration.

detailed description

It should be noted that the following detailed description is exemplary and intended to provide further explanation of the present invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

It should be noted that the terminology used here is only for describing specific embodiments, and is not intended to limit exemplary embodiments according to the present invention. As used herein, unless the invention clearly states otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprising" and/or "comprising" are used in this specification, their Indicates the presence of features, steps, operations, means, components and/or combinations thereof.

Example 1

In a typical implementation of the present invention, this embodiment discloses a design and selection method for building a seawater source heat pump system. Since the building load changes according to changes in outdoor air temperature, taking summer as an example, it can be seen from Figure 1 that At 1 o'clock, the annual temperature reaches the maximum value, and the cooling load of the building at this time also reaches the maximum value. The seawater temperature has a certain delay and hysteresis relative to the atmospheric temperature, so when the annual temperature reaches the maximum value, the corresponding seawater temperature does not reach the maximum value at 2 o'clock. Since the amount of heat exhausted by the system is related to the seawater temperature, the lower the seawater temperature is, the greater the EER is, and the EER of the system is a relatively high value at 2 o'clock, so it can be properly cut when selecting the capacity of the unit. The same is true in winter, and the asynchrony of the energy flow harmonic function phase can be used to reduce the installed capacity of the system and reduce investment costs.

Utilize above-mentioned characteristic, present embodiment comprises the following steps:

Step 1: Analyze the hourly atmospheric temperature and shallow water temperature parameters of the typical meteorological year of the city where the design project is located, and regress the temperature harmonic functions of the two;

Step 2: Construct the resistance-capacity calculation model of the front-end water intake heat exchange system of the building and seawater source heat pump system;

Step 3: Under the annual working conditions, coordinate the response characteristics of the supply and demand energy flow harmonic function of the thermal process of the building and the front-end heat exchanger, according to the harmonic function of the air and seawater temperature in a typical year, bring the front-end water exchange of the building and seawater source heat pump system In the thermal subsystem resistance and capacitance calculation model, calculate the supply and demand energy flow harmonic function of the thermal process of the building subsystem and the front-end water intake and heat exchange subsystem of the seawater source heat pump system for 8760 hours throughout the year;

Step 4: Based on the 8760-hour building subsystem thermal process demand energy flow harmonic function and the seawater source heat pump system front-end water intake heat exchange subsystem thermal process supply energy flow harmonic function (to ensure the inlet temperature setting of the heat exchange equipment heat medium The design water supply temperature under rated working conditions) is the expected value, and the optimization goal is to minimize the deviation between the power of the unit and the expected value, and to ensure that the energy supply of the unit is greater than the expected value at each time of 8760 hours throughout the year. Select the model and number of water source heat pump units , to build a seawater source heat pump system unit design and selection method.

It can be understood that in Step 2 and Step 3, this embodiment constructs an integrated building resistance-capacity model and a dynamic resistance-capacity model of the front-end water intake heat exchanger of the seawater source heat pump, where the city belongs to a representation method of the area where the building is located , and can also be specific to other geographic or administrative areas.

It can be understood that the seawater source heat pump system in this embodiment is a heat pump air conditioning system that uses seawater as the heat exchange medium, for example, an energy storage device disclosed in the patent application number CN201821314432.X Seawater source heat pump system.

It can be understood that the method disclosed in this embodiment can also be applied to a seawater-soil dual-source heat pump system.

It can be understood that the temperature of the air in the building and the temperature of the sea water are obtained through the temperature sensors arranged in the building; the working mode includes heating or cooling, and the automatic switching of the heating mode and the cooling mode is within the field Known methods, its specific content will not be repeated.

Further, the asynchronicity of the harmonic functions of atmospheric temperature and seawater temperature in a typical meteorological year in the region is analyzed; using these two temperature harmonic functions as input values, under the annual working conditions, the heat of the building and the front-end water intake heat exchanger is coordinated. Process supply and demand energy flow harmonic function response characteristics, including the following steps:

set region;

Statistically set the hourly average temperature of a typical meteorological year in the set area and make a temperature curve with the horizontal axis as time and the vertical axis as temperature;

Calculate the hourly seawater temperature of the nearshore shallow surface layer in the set area and make an average water temperature curve with the horizontal axis as time and the vertical axis as temperature;

The time axes of the atmospheric air temperature curve and the sea water temperature curve are superimposed.

The hourly average temperature curve and water temperature curve after making are shown in Figure 1. The hourly average temperature is selected as the hourly average temperature, and the seawater temperature is selected as the hourly average water temperature of the near-shore shallow surface layer.

It can be understood that the amplitude difference between the two temperature harmonic functions of air and seawater is the temperature value corresponding to the difference between the highest value of the air temperature curve and the water temperature curve, and the difference between the lowest value of the air temperature curve and the water temperature curve. The temperature value corresponding to the difference.

Further, the resistance-capacity calculation model of the building and the front-end water intake heat exchange subsystem of the seawater source heat pump is constructed, and the hourly average atmospheric temperature and seawater temperature harmonic function of a typical meteorological year are used as the input of the resistance-capacity model of the building and heat exchange subsystem value, calculate the hourly demand energy flow harmonic function of the building and the hourly supply energy flow harmonic function of the heat exchanger subsystem.

Further, based on the harmonic function of energy flow demanded by the thermal process of the building subsystem for 8760 hours throughout the year and the harmonic function of the energy flow supplied by the thermal process of the front-end water intake heat exchange subsystem of the seawater source heat pump system (to ensure that the inlet temperature setting of the heat transfer equipment heat medium is the design water supply temperature under rated working conditions), and the change amplitude difference is the expected value. The optimization goal is to minimize the deviation between the power of the unit and the expected value, and to ensure that the energy supply of the unit at each time of 8760 hours throughout the year is greater than the expected value.

Further, after selecting the number and type of heat pump units, the actual cooling or heating effect is calculated according to the power of the selected heat pump units.

This calculation example takes Qingdao area as an example. As shown in the figure, the air temperature in summer in Qingdao area is at point 1 in the figure (about 14:00 on July 25), when the temperature is the highest. Let the corresponding building cooling load at this time be 1000kw. The seawater temperature has a delay of about 20 days relative to the atmospheric temperature, so the highest seawater temperature is not the 1′ point corresponding to July 25, but the 2 point corresponding to around August 15th, and on August 15th At that time, the atmospheric temperature has dropped, and the cooling load of the building is 800kw.

According to the traditional unit selection method, the seawater source heat pump unit is selected according to the building cooling load multiplied by 10% of the margin, that is, 1100kw as the rated cooling capacity. Considering the influence of water temperature on the unit EER, the unit EER corresponding to the highest water temperature is selected. Seawater source unit A, such as EER4.5 of the highest water temperature unit, choose a power of 245kw.

In this embodiment, the delay of the seawater temperature relative to the atmospheric temperature is fully considered. According to the EER curve of the seawater source unit A, the higher the seawater temperature, the smaller the EER of the unit. At 2 o'clock (August 15th), the unit EER corresponding to the average seawater temperature is 4.5, and at 1' o'clock (July 25th), the corresponding unit EER is about 5.0.

Then on July 25th when the cooling load of the building is the largest, the power of the unit is W=1000/5.0=200kw;

The cooling capacity of the calculation unit on August 15, when the seawater temperature is the highest, is Q=200×4.5=900kw>800kw, so it can meet the building cooling load requirement on that day.

Therefore, according to this embodiment, a seawater source heat pump unit with a power of 200kw can be selected, the power is reduced by 22.5%, and the installed capacity of the unit is significantly reduced. This can not only reduce the initial investment of the unit, but also reduce the operating cost of the unit.

Example 2

The difference between this embodiment and embodiment 1 is that this calculation example takes Qingdao area as an example, as shown in Figure 1, the air temperature in winter in Qingdao area is at 3 points in the figure, and the temperature is the lowest during (about January 20), assuming this The corresponding building heat load is 1000kw. The seawater temperature has a delay of about 20 days relative to the atmospheric temperature, so the lowest seawater temperature is not 2:00 on January 20, but 4:00 on February 15th, and on February 15th Atmospheric temperature has risen, and the building heat load is 800kw at this time.

For the soil-seawater dual-source heat pump system with the heat exchanger buried shallowly in the seabed as the front-end heat exchanger, the heat gain of the front-end heat exchanger changes with the change of seawater temperature. The higher the seawater temperature, the higher the heat gain of the front-end heat exchanger. The increased heat intake can reduce the power consumption of the heat pump unit.

According to the traditional unit selection method, the power of the seawater source heat pump unit is determined by the heat output of the heat exchanger corresponding to the coldest seawater temperature. Assuming that at 4:00 (February 15th), when the average seawater temperature is the lowest, the corresponding heat gain of the front-end heat exchanger is 750kw, and the power of the seawater source heat pump unit is 250kw.

In this embodiment, the delay of the seawater temperature relative to the atmospheric temperature is fully considered, assuming that at 4:00 (February 15th), when the average seawater temperature is the lowest, the corresponding heat gain of the front-end heat exchanger is 750kw, then 3 'Point (January 20) corresponds to the heat gain of the front-end heat exchanger is about 800kw.

Then on January 20th when the building heat load is the largest, the power of the unit is W=1000-800=200kw;

The power of the calculation unit on February 15th when the seawater temperature is the lowest is W=800-750=50kw>200kw, so it can meet the building heat load requirement on that day.

Therefore, according to this embodiment, a seawater source heat pump unit with a rated power of 200kw can be selected, the power is reduced by 25%, and the installed capacity of the unit is reduced. This can not only reduce the initial investment of the unit, but also reduce the operating cost of the unit.

Example 3

In a typical implementation of the present invention, this embodiment discloses a system for constructing a seawater source heat pump, which can be used to implement the method disclosed in Embodiment 1 or Embodiment 2, including the following modules, cascading actions between modules :

a first module configured to analyze the asynchrony of hourly changes in both air and sea temperature harmonic functions during a typical year at a building design site;

The second module is configured to construct a resistance-capacity calculation model of the front-end water intake and heat exchange subsystem of the building and seawater source heat pump system;

The third module is configured to calculate the supply and demand energy flow harmonic function of the thermal process of the building subsystem and the front-end water intake and heat exchange subsystem of the seawater source heat pump system for 8760 hours throughout the year;

The fourth model, which is configured to use the harmonic function of the energy flow demanded by the thermal process of the building subsystem for 8760 hours throughout the year and the harmonic function of the energy flow supplied by the thermal process of the front-end water intake and heat exchange subsystem of the seawater source heat pump system (to ensure that the heat medium of the heat exchange equipment The inlet temperature is set as the design water supply temperature under the rated working condition) and the change amplitude difference is the expected value. The optimization goal is to minimize the deviation between the power of the unit and the expected value, and to ensure that the energy supply of the unit is greater than the expected value at each time of 8760 hours throughout the year. Choose a water source Model and number of heat pump units.

It can be understood that the cascaded actions between the modules, the cascaded action relationship is that when the nth module fails to operate or cannot operate, the n+1th module will start to operate.

n is an integer greater than or equal to 1.

Of course, the above-mentioned first module, second module, and third module correspond to the first step, second step, and third step in Embodiment 1, and the examples and application scenarios implemented by the above-mentioned modules and corresponding steps are the same, but not It is limited to the content disclosed in the first embodiment above. It should be noted that, as a part of the system, the above-mentioned modules can be executed in a computer system such as a set of computer-executable instructions.

Example 4

In a typical implementation of the present invention, this embodiment discloses a computer-readable storage medium, in which a plurality of instructions are stored, and the instructions are suitable for being loaded by a processor of a terminal device and executing Embodiment 1 or Embodiment A method for constructing a seawater source heat pump system described in 2.

Example 5

In a typical implementation of the present invention, this embodiment discloses a terminal device, including a processor and a computer-readable storage medium, the processor is used to implement instructions; the computer-readable storage medium is used to store multiple instructions, and the The instructions are suitable for being loaded by a processor and executing the method for constructing a seawater source heat pump system described in Embodiment 1 or Embodiment 2.

Example 6

In a typical implementation of the present invention, this embodiment discloses a seawater source heat pump system, performing the method for constructing a seawater source heat pump system as described in embodiment 1 or embodiment 2;

or,

A system comprising a seawater source heat pump system as described in Embodiment 3;

or,

Including the computer-readable storage medium as described in embodiment 4;

or,

It includes the terminal device as described in Embodiment 5.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. 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 (9)

1. A method for building seawater source heat pump system equipment selection and design, characterized in that it comprises the following steps: Step 1: Analyze the hourly atmospheric temperature and shallow water temperature parameters of the city where the design project is located, regress the temperature harmonic function of the two, and obtain the hourly atmospheric temperature and shallow water temperature parameters of the typical meteorological year, and obtain two The temperature harmonic function of those; Step 2: Construct the resistance-capacitance calculation model of the front-end water intake heat exchange system of the building and the seawater source heat pump system; the seawater temperature harmonic function has a phase delay and amplitude attenuation compared with the atmospheric temperature harmonic function, and the seawater temperature is related to the amount of heat discharged by the system. The lower the seawater temperature is, the greater the EER is. At 14 o'clock, the EER of the system is a relatively high value, so when selecting the capacity of the unit, it can be appropriately reduced to build a resistance-capacity calculation model; the resistance-capacity calculation model is based on The temperature harmonic function obtained, output the harmonic function of the supply and demand energy flow in the heat exchange process to coordinate the response characteristics of the supply and demand energy flow harmonic function in the heat exchange process; Step 3: Under the annual working conditions, coordinate the response characteristics of the supply and demand energy flow harmonic function of the thermal process of the building and the front-end heat exchanger, according to the harmonic function of the air and seawater temperature in a typical year, bring the front-end water exchange of the building and seawater source heat pump system In the thermal subsystem resistance-capacitance calculation model, the harmonic function of supply and demand energy flow in the thermal process of the building subsystem and the front-end water intake heat exchange subsystem of the seawater source heat pump system is calculated; the amplitude difference between the air and seawater temperature harmonic functions is The temperature value corresponding to the difference between the temperature curve and the highest value of the water temperature curve, and the temperature value corresponding to the difference between the temperature curve and the lowest value of the water temperature curve; Step 4: Take the difference between the harmonic function of energy flow demanded by the thermal process of the building subsystem and the harmonic function of the harmonic function of the energy flow supplied by the front-end water intake heat exchange subsystem of the seawater source heat pump system as the expected value to ensure that the heat medium of the heat exchange equipment is stable. The inlet temperature is set to the design water supply temperature under rated working conditions, with the optimization goal of minimizing the deviation between the power of the unit and the expected value, and ensuring that the energy supply of the unit at all times throughout the year is greater than the expected value. Select the model and number of water source heat pump units to construct a seawater source heat pump System unit design and type selection method; the expected value is the change amplitude difference between the two energy flow harmonic functions of the building subsystem and the seawater source front-end water intake heat exchange subsystem, and the change amplitude difference is the highest value of the building demand curve and the front-end supply curve The difference between corresponds to the energy flow value; the energy value corresponding to the difference is the expected cooling and heating load of the system. 2. The equipment type selection and design method for building a seawater source heat pump system according to claim 1, wherein the heat exchange process is a heat exchange process between the building and the front-end water extractor of the seawater source heat pump system. 3. The equipment selection and design method for constructing a seawater source heat pump system as claimed in claim 1, wherein, when the resistance-capacitance calculation model outputs the harmonic function of supply and demand energy flow in the heat exchange heat process according to the acquired temperature harmonic function, it includes The following steps: set region; Statistically set the hourly average temperature of a typical meteorological year in the set area and make a temperature curve with the horizontal axis as time and the vertical axis as temperature; Calculate the hourly seawater temperature of the nearshore shallow surface layer in the set area and make an average water temperature curve with the horizontal axis as time and the vertical axis as temperature; The time axes of the atmospheric air temperature curve and the sea water temperature curve are superimposed. 4. The method for selecting and designing equipment for constructing a seawater source heat pump system according to claim 1, wherein the resistance-capacity calculation model is a resistance-capacity calculation model of the building and the front-end water intake heat exchange system of the seawater source heat pump system. 5. The equipment selection and design method for constructing a seawater source heat pump system according to claim 1, characterized in that, after selecting the number and type of heat pump units, the actual cooling or heating effect is calculated according to the power of the selected heat pump units. 6. A system for constructing a seawater source heat pump system, characterized in that it includes the following modules, and cascade actions between the modules: The first module is configured to analyze the hourly atmospheric temperature and shallow water temperature parameters of a typical meteorological year in the city where the design project is located, and regress the temperature harmonic functions of the two; at the same time, obtain the hourly atmospheric temperature and shallow water temperature of a typical meteorological year parameter, and obtain the temperature harmonic function of both; The second module is configured to construct a resistance-capacitance calculation model of the front-end water intake heat exchange system of the building and seawater source heat pump system; the seawater temperature harmonic function has a phase delay and amplitude attenuation compared with the atmospheric temperature harmonic function, and the amount of heat discharged by the system is seawater The temperature is related, the lower the seawater temperature is, the greater the EER is, and the EER of the system is a relatively high value at 14:00, so when selecting the capacity of the unit, it can be appropriately reduced and the resistance-capacity calculation model can be constructed; Based on the obtained temperature harmonic function, the resistance-capacitance calculation model outputs the harmonic function of supply and demand energy flow in the heat exchange heat process to coordinate the response characteristics of the supply and demand energy flow harmonic function in the heat exchange process; The third module, which is configured to obtain the energy flow harmonic function; under the annual operating conditions, the response characteristics of the supply and demand energy flow harmonic function of the collaborative building and front-end heat exchanger thermal process, according to the typical annual air and seawater temperature harmonics The function is brought into the resistance-capacitance calculation model of the front-end water intake and heat exchange subsystem of the building and seawater source heat pump system to calculate the annual supply and demand energy flow harmonic function of the building subsystem and the front-end water intake and heat exchange subsystem of the seawater source heat pump system; the air The amplitude difference between the two temperature harmonic functions of seawater and seawater is the temperature value corresponding to the difference between the temperature curve and the highest value of the water temperature curve, and the temperature value corresponding to the difference between the temperature curve and the lowest value of the water temperature curve; The fourth module is configured to construct the design and selection framework of the seawater source heat pump system unit; the harmonic function of the energy flow demanded by the thermal process of the building subsystem throughout the year and the energy flow harmonic function of the thermal process supply energy flow of the front-end water intake and heat exchange subsystem of the seawater source heat pump system The amplitude difference of the wave function change is the expected value, so that the inlet temperature of the heat medium of the heat exchange equipment is set to the design water supply temperature under the rated working condition, and the optimization goal is to minimize the deviation between the power of the unit and the expected value, and to ensure that the unit is at all times throughout the year The energy supply is greater than the expected value, select the model and number of water source heat pump units, and construct the design and selection method of seawater source heat pump system units; the expected value is the change amplitude of the two energy flow harmonic functions of the building subsystem and the front-end water intake and heat exchange subsystem of the seawater source Difference, the change amplitude difference is the energy flow value corresponding to the difference between the building demand curve and the highest value of the front-end supply curve; the energy value corresponding to the difference is the expected value of the cooling and heating load of the system. 7. A computer-readable storage medium, wherein a plurality of instructions are stored, and the instructions are suitable for being loaded by a processor of a terminal device and executing the construction described in any one of claims 1-5. Seawater source heat pump system method. 8. A terminal device, characterized in that it includes a processor and a computer-readable storage medium, the processor is used to implement instructions; the computer-readable storage medium is used to store multiple instructions, and the instructions are suitable for being loaded by the processor and A method for constructing a seawater source heat pump system described in any one of claims 1-5 is carried out. 9. A seawater source heat pump system, characterized in that the method for constructing a seawater source heat pump system according to any one of claims 1-5 is performed; or, comprising the computer readable storage medium of claim 7; or, Comprising a terminal device as claimed in claim 8.

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