CN112944702A - Method, device and medium for calculating input-output ratio of solar cogeneration system - Google Patents

Method, device and medium for calculating input-output ratio of solar cogeneration system Download PDF

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CN112944702A
CN112944702A CN202110179088.8A CN202110179088A CN112944702A CN 112944702 A CN112944702 A CN 112944702A CN 202110179088 A CN202110179088 A CN 202110179088A CN 112944702 A CN112944702 A CN 112944702A
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total
solar
heat
output
power system
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谢胡凌
陆仕荣
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Chongqing Institute of Green and Intelligent Technology of CAS
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24SSOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S50/00Arrangements for controlling solar heat collectors
    • F24S50/80Arrangements for controlling solar heat collectors for controlling collection or absorption of solar radiation
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24SSOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S50/00Arrangements for controlling solar heat collectors
    • F24S50/40Arrangements for controlling solar heat collectors responsive to temperature
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24SSOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S50/00Arrangements for controlling solar heat collectors
    • F24S50/60Arrangements for controlling solar heat collectors responsive to wind
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/40Solar thermal energy, e.g. solar towers

Abstract

The invention provides a method, a device and a medium for calculating the input-output ratio of a solar combined heat and power system, wherein the method comprises the following steps: acquiring meteorological data corresponding to a plurality of continuous time periods of the location of a solar combined heat and power system; acquiring the total output electric quantity and the total heat quantity of the solar combined heat and power system according to the total lighting area of the solar combined heat and power system, the temperature of a heat exchange medium of the output system and corresponding meteorological data, and further acquiring the total energy-saving cost; acquiring a system input-output ratio according to the total manufacturing cost of the solar combined heat and power system and the total energy-saving cost; the invention can effectively improve the accuracy of system performance and economic evaluation.

Description

Method, device and medium for calculating input-output ratio of solar cogeneration system
Technical Field
The invention relates to the field of natural energy application, in particular to a method, a device and a medium for calculating the input-output ratio of a solar combined heat and power system.
Background
The solar combined heat and power system based on the photovoltaic and photo-thermal comprehensive utilization technology can realize the full-spectrum efficient low-cost collection and utilization of solar energy, the thermoelectric output performance of the solar combined heat and power system is greatly influenced by solar energy resources, meteorological conditions and water temperature, and the dispersibility and instability characteristics of the solar energy resources, the meteorological conditions and the water temperature in different seasons and different times are required to be calculated in order to accurately predict and analyze the thermoelectric output performance and the economical efficiency of the solar combined heat and power system under the conditions
Disclosure of Invention
In view of the problems in the prior art, the invention provides a method, a device and a medium for calculating the input-output ratio of a solar combined heat and power system, and mainly solves the problem of low accuracy in evaluating the output performance of the solar combined heat and power system under climatic conditions of different seasons and the like.
In order to achieve the above and other objects, the present invention adopts the following technical solutions.
The method for calculating the input-output ratio of the solar combined heat and power system comprises the following steps:
acquiring meteorological data corresponding to a plurality of continuous time periods of the location of a solar combined heat and power system;
acquiring the total output electric quantity and the total heat quantity of the solar combined heat and power system according to the total lighting area of the solar combined heat and power system, the temperature of a heat exchange medium of the output system and corresponding meteorological data, and further acquiring the total energy-saving cost;
and obtaining the input-output ratio of the system according to the total manufacturing cost of the solar combined heat and power system and the total energy-saving cost.
Optionally, the meteorological data comprises: total solar irradiance, direct solar irradiance, ambient temperature, wind speed, and temperature of heat exchange medium of the output system.
Optionally, the step of obtaining the total output power and the total heat of the solar cogeneration system comprises:
and acquiring transient output electric power and heat flow of the solar combined heat and power system in each time period, and counting the total electric quantity and the total heat according to the duration of each corresponding time period.
Optionally, the step of calculating the transient output electric power and heat flow comprises:
establishing a photoelectric thermal coupling transient model according to the energy transfer relation of the solar combined heat and power system;
and iterating the photoelectric thermal coupling transient model according to the mass flow rate of the heat exchange medium until a preset iteration condition is met, and outputting the transient output electric power and the heat flow of the system.
Optionally, the iterative process of the photo-electric-thermal coupling transient model includes:
setting an initial value and an iteration increment of the mass flow rate of the heat exchange medium, and bringing the value of the mass flow rate of the heat exchange medium into an energy transfer relation of the photoelectric thermal coupling transient model to obtain the output of the model after each increment iteration; and when the model output meets the preset iteration condition, ending the iteration, and obtaining the transient output electric power and the heat flow of the system according to the corresponding output result.
Optionally, the energy transfer relationship is expressed as:
Figure BDA0002940928700000021
wherein G ist,iRepresenting the total solar irradiance, StRepresents the total lighting area, P, of the solar cogeneration systeme,iRepresenting the instantaneous output power, [ phi ]th,iRepresents the heat flow; gd,iRepresenting direct solar irradiance, Ta,iDenotes the ambient temperature, uwi,iIndicating wind speed, Twa,iIndicating the temperature, T, of the heat transfer medium of the input systemoutThe temperature of the heat exchange medium of the system is output,
Figure BDA0002940928700000023
representing the total mass flow rate of the heat exchange medium through the solar thermal power train.
Solar thermal energy electricity cogeneration system input-output ratio calculation device includes:
the meteorological data acquisition module is used for acquiring meteorological data corresponding to a plurality of continuous time periods of the location of the solar combined heat and power system;
the energy-saving operation module is used for acquiring the total output electric quantity and the total heat quantity of the solar combined heat and power system according to the total lighting area of the solar combined heat and power system, the temperature of a heat exchange medium of the output system and corresponding meteorological data so as to obtain the total energy-saving cost;
and the input-output operation module is used for acquiring the input-output ratio of the system according to the total manufacturing cost of the solar combined heat and power system and the total energy-saving cost.
Optionally, the meteorological data comprises: total solar irradiance, direct solar irradiance, ambient temperature, wind speed, and temperature of heat exchange medium of the output system.
Optionally, the energy-saving operation module includes a transient calculation unit, configured to obtain a transient output electric power and a heat flow of the solar cogeneration system at each time interval, and count the total electric quantity and the total heat according to a time length of each corresponding time interval.
One or more machine readable media having instructions stored thereon that, when executed by one or more processors, cause an apparatus to perform the solar cogeneration system input-output ratio calculation method.
As described above, the method, the device and the medium for calculating the input-output ratio of the solar cogeneration system according to the present invention have the following advantageous effects.
The calculation accuracy is higher, the seasonal practicability is stronger, the thermoelectric output performance of the solar combined heat and power system in different time periods can be obtained, and the method is favorable for providing support for cost performance evaluation, technical optimization and the like.
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Fig. 1 is a flowchart of a method for calculating an input-output ratio of a solar cogeneration system in an embodiment of the invention.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.
Referring to fig. 1, the present invention provides a method for calculating an input-output ratio of a solar cogeneration system, including the following steps:
and step S01, acquiring meteorological data corresponding to a plurality of continuous time periods of the location of the solar combined heat and power system.
In an embodiment, the solar cogeneration system integrates a photovoltaic and photo-thermal integrated power supply and heat supply system, and because illumination, temperature, air flow and the like change along with seasonal changes, the difference between the output ratios of electric energy and heat energy of the solar cogeneration system at different time periods is large, and in order to more accurately perform system performance evaluation based on a time period, time periods need to be divided according to meteorological changes of different application places to perform segmented data acquisition and analysis.
Specifically, a year can be selected as a time period, and the time of the local solar cogeneration system is discretized in one year. The total time of the normal operation of the solar combined heat and power system in one local year is TtWill TtIs divided into NtAnd each section is as follows: delta Ti=Tt/Nt (1)
The specific segmentation can be set according to the actual application scenario and the environmental condition, and is not limited herein.
Further, a single local time duration delta T of the solar heat and power cogeneration system is collectediThe meteorological data of (a).
Single local time duration delta T of solar cogeneration systemiThe meteorological data of (a) includes: total solar irradiance Gt,iDirect solar irradiance Gd,iAmbient temperature Ta,iVelocity u of windwi,iTemperature T of heat exchange medium input into systemwa,i
In step S02, the total output electric quantity and the total heat quantity of the solar cogeneration system are obtained according to the total lighting area of the solar cogeneration system, the temperature of the heat exchange medium of the output system, and the corresponding meteorological data, so as to obtain the total energy-saving cost.
In one embodiment, the step of obtaining the total output power and the total heat of the solar cogeneration system comprises:
and acquiring transient output electric power and heat flow of the solar combined heat and power system in each time period, and counting the total electric quantity and the total flow according to the time length of each corresponding time period.
Specifically, the total lighting area S of the solar combined heat and power system is determined firstlytTemperature T of heat exchange medium with output systemout
Further calculating all time length delta T in one year in the localiTransient output electric power P of solar combined heat and power system under corresponding conditione,iAnd heat flow phith,i
The calculation steps are as follows:
a. a photo-thermal coupling transient model is established according to the energy transfer relation of the solar combined heat and power system, and the energy transfer equation is as follows:
Figure BDA0002940928700000041
wherein the content of the first and second substances,
Figure BDA0002940928700000042
is the total mass flow rate of the heat exchange medium passing through the solar thermal power system. Under the condition that the meteorological data and the energy conversion coefficients corresponding to the solar cogeneration system are known, obtaining the relation between the energy conversion and the total mass flow rate of the heat exchange medium is the prior art, and details are not repeated here.
b. And iterating the photoelectric thermal coupling transient model according to the mass flow rate of the heat exchange medium until a preset iteration condition is met, and outputting the transient output electric power and the heat flow of the system.
The iteration process can comprise setting an initial value and an iteration increment of the mass flow rate of the heat exchange medium, and bringing the value of the mass flow rate of the heat exchange medium into the energy transfer relation of the photoelectric-thermal coupling transient model to obtain the output of the model after each iteration of the increment; and when the model output meets the preset iteration condition, ending the iteration, and obtaining the transient output electric power and the heat flow of the system according to the corresponding output result.
Specifically, the mass flow rate of the heat exchange medium
Figure BDA0002940928700000051
As the variable of the iteration of the formula (8), the initial value of the mass flow rate of the heat exchange medium is assumed
Figure BDA0002940928700000052
And put into the formula (8), the calculated result is
Figure BDA0002940928700000053
Then use
Figure BDA0002940928700000054
Is increased by
Figure BDA0002940928700000055
Will be provided with
Figure BDA0002940928700000056
In equation (8), the result of the calculation is
Figure BDA00029409287000000516
Continue the aforementioned flow to the nth time, i.e., order
Figure BDA0002940928700000058
Will be provided with
Figure BDA0002940928700000059
In equation (8), the result of the calculation is
Figure BDA00029409287000000510
When in use
Figure BDA00029409287000000511
When so, the iteration ends. At this time, the value obtained by the nth iteration of the formula (8)
Figure BDA00029409287000000517
Figure BDA00029409287000000513
Respectively outputting electric power P for solar energy cogeneration system transient statee,iAnd heat flow phith,i
And step S03, obtaining the input-output ratio of the system according to the total manufacturing cost and the total energy-saving cost of the solar combined heat and power system.
The method comprises the following specific steps
1) Calculating all time length delta T of the local yeariTransient output electric quantity Q of solar combined heat and power system under corresponding conditione,iAnd heat quantity Qth,iThe calculation formula is as follows:
Qe,i=Pe,iΔTi (2)
Qth,i=Φth,iΔTi (3)
2) calculating the local total time of one year TtIn, the solar energy cogeneration system outputs the total electric quantity Qe,tAnd total heat quantity Qth,tThe calculation formula is as follows:
Figure BDA00029409287000000514
Figure BDA00029409287000000515
3) calculating the local total time of one year TtIn, the solar energy cogeneration system outputs the total electric quantity Qe,tAnd total heat quantity Qth,tCorresponding total energy saving cost SCtThe calculation formula is as follows:
SCt=Qe,tUPe+Qth,tUPth (6)
wherein, UPeFor equivalent unit price of electricity, UPthIs a unit price of equivalent heat.
4) Calculating the input-output ratio of the solar combined heat and power system according to the following calculation formula:
R=CTt/SCt (7)
wherein, CTtThe total cost of the solar combined heat and power system is reduced.
The embodiment provides a solar cogeneration system input-output ratio calculation device, which is used for executing the solar cogeneration system input-output ratio calculation method in the foregoing method embodiment. Since the technical principle of the system embodiment is similar to that of the method embodiment, repeated description of the same technical details is omitted.
In one embodiment, the solar cogeneration system input-output ratio calculation device comprises:
the meteorological data acquisition module is used for acquiring meteorological data corresponding to a plurality of continuous time periods of the location of the solar combined heat and power system;
the energy-saving operation module is used for acquiring the total output electric quantity and the total heat quantity of the solar combined heat and power system according to the total lighting area of the solar combined heat and power system, the temperature of a heat exchange medium of the output system and corresponding meteorological data so as to obtain the total energy-saving cost;
and the input-output operation module is used for acquiring the input-output ratio of the system according to the total manufacturing cost of the solar combined heat and power system and the total energy-saving cost.
In one embodiment, the meteorological data comprises: total solar irradiance, direct solar irradiance, ambient temperature, wind speed, and temperature of heat exchange medium input into the system.
In an embodiment, the energy-saving operation module includes a transient calculation unit, configured to obtain a transient output electric power and a heat flow of the solar cogeneration system at each time interval, and count the total electric quantity and the total heat according to a time duration of each corresponding time interval.
One or more machine-readable media are also provided, and one or more modules (programs) are stored in the machine-readable media, and when the one or more modules are applied to a device, the device may execute instructions (instructions) included in the method for calculating the input-output ratio of the solar combined heat and power system in fig. 1 according to the embodiment of the present application.
In summary, the method, the device and the medium for calculating the input-output ratio of the solar combined heat and power system have the advantages of higher calculation accuracy, wider seasonal practicability, capability of obtaining detailed information of thermoelectric output performance and economy of the solar combined heat and power system in different time periods and the like, and can provide theoretical support for cost performance evaluation, technical optimization and updating of the solar combined heat and power system. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims (10)

1. The method for calculating the input-output ratio of the solar combined heat and power system is characterized by comprising the following steps of:
acquiring meteorological data corresponding to a plurality of continuous time periods of the location of a solar combined heat and power system;
acquiring the total output electric quantity and the total heat quantity of the solar combined heat and power system according to the total lighting area of the solar combined heat and power system, the temperature of a heat exchange medium of the output system and corresponding meteorological data, and further acquiring the total energy-saving cost;
and obtaining the input-output ratio of the system according to the total manufacturing cost of the solar combined heat and power system and the total energy-saving cost.
2. The solar cogeneration system input-output ratio calculation method of claim 1, wherein the meteorological data comprises: total solar irradiance, direct solar irradiance, ambient temperature, wind speed, and temperature of heat exchange medium input into the system.
3. The method for calculating the input-output ratio of the solar cogeneration system according to claim 1, wherein the step of obtaining the total output electric quantity and the total heat quantity of the solar cogeneration system comprises the steps of:
and acquiring transient output electric power and heat flow of the solar combined heat and power system in each time period, and counting the total electric quantity and the total heat according to the duration of each corresponding time period.
4. A solar combined heat and power system input-output ratio calculation method according to claim 3, wherein the transient output electric power and heat flow calculation step includes:
establishing a photoelectric thermal coupling transient model according to the energy transfer relation of the solar combined heat and power system;
and iterating the photoelectric thermal coupling transient model according to the mass flow rate of the heat exchange medium until a preset iteration condition is met, and outputting the transient output electric power and the heat flow of the system.
5. The solar cogeneration system input-output ratio calculation method according to claim 4, wherein the iterative process of the photoelectric thermal coupling transient model comprises:
setting an initial value and an iteration increment of the mass flow rate of the heat exchange medium, and bringing the value of the mass flow rate of the heat exchange medium into an energy transfer relation of the photoelectric thermal coupling transient model to obtain the output of the model after each increment iteration; and when the model output meets the preset iteration condition, ending the iteration, and obtaining the transient output electric power and the heat flow of the system according to the corresponding output result.
6. A solar combined heat and power system input-output ratio calculation method according to claim 4, wherein the energy transfer relationship is expressed as:
Figure FDA0002940928690000021
wherein G ist,iRepresenting the total solar irradiance, StRepresents the total lighting area, P, of the solar cogeneration systeme,iRepresenting the instantaneous output power, [ phi ]th,iRepresents the heat flow; gd,iRepresenting direct solar irradiance, Ta,iDenotes the ambient temperature, uwi,iIndicating wind speed, Twa,iIndicating the temperature, T, of the heat transfer medium of the input systemoutThe temperature of the heat exchange medium of the output system is shown,
Figure FDA0002940928690000022
representing the total mass flow rate of the heat exchange medium through the solar thermal power train.
7. Solar thermal energy electricity cogeneration system input-output ratio calculating device, its characterized in that includes:
the meteorological data acquisition module is used for acquiring meteorological data corresponding to a plurality of continuous time periods of the location of the solar combined heat and power system;
the energy-saving operation module is used for acquiring the total output electric quantity and the total heat quantity of the solar combined heat and power system according to the total lighting area of the solar combined heat and power system, the temperature of a heat exchange medium of the output system and corresponding meteorological data so as to obtain the total energy-saving cost;
and the input-output operation module is used for acquiring the input-output ratio of the system according to the total manufacturing cost of the solar combined heat and power system and the total energy-saving cost.
8. The solar cogeneration system input-output ratio calculation apparatus of claim 7, wherein the meteorological data comprises: total solar irradiance, direct solar irradiance, ambient temperature, wind speed, and temperature of heat exchange medium input into the system.
9. The solar combined heat and power system input-output ratio calculation device according to claim 7, wherein the energy-saving operation module comprises a transient calculation unit, and is configured to obtain the transient output electric power and the heat flow of the solar combined heat and power system in each time interval, and count the total electric quantity and the total heat quantity according to the duration of each corresponding time interval.
10. One or more machine-readable media having instructions stored thereon, which when executed by one or more processors, cause an apparatus to perform the method recited by one or more of claims 1-6.
CN202110179088.8A 2021-02-07 2021-02-07 Method, device and medium for calculating input-output ratio of solar cogeneration system Pending CN112944702A (en)

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