CN111520887A - Dynamic hydraulic balance adjusting device of central air conditioning system - Google Patents
Dynamic hydraulic balance adjusting device of central air conditioning system Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
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Abstract
The invention provides a dynamic hydraulic balance adjusting device of a central air-conditioning system. The device includes: the central air-conditioning system comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring operation data of each fan coil of the central air-conditioning system, indoor environment data and outdoor environment data of a room corresponding to each fan coil and water supply temperature data of a central air-conditioning main pipe; the setting unit is used for setting a target indoor environment state of a room corresponding to each fan coil of the central air-conditioning system; the first calculation unit is used for calculating a control parameter curve of the central air-conditioning system according to the target indoor environment state of the room corresponding to each fan coil and the water supply temperature data of the central air-conditioning main pipe; and the control unit is used for controlling the operation of the central air-conditioning system according to the control parameter curve. The device realizes dynamic hydraulic balance through dynamic control of setting the electric two-way valve of the fan coil and the wind speed of the fan coil, meets the requirement of indoor comfort, reduces the energy consumption of an air conditioning system, and has low installation cost.
Description
Technical Field
The invention relates to the field of central air-conditioning system control, in particular to a dynamic hydraulic balance adjusting device of a central air-conditioning system.
Background
With the development of economy, more and more buildings adopt central air conditioning systems. According to the existing data statistics, the energy consumption of the central air-conditioning system accounts for more than 40% of the total energy consumption of the building. As energy and environment become increasingly concerned, energy conservation of central air conditioning systems draws more and more attention.
In the operation process of the central air-conditioning system, hydraulic imbalance is one of the main reasons for energy waste. The hydraulic imbalance of the central air-conditioning system causes unreasonable distribution of flow of each pipeline and equipment of the system, so that the flow flowing through the terminal equipment is inconsistent with the designed flow, thereby causing uneven cold and heat in different areas and causing waste of energy. In order to solve the problem, the pump lift of the water pump can be increased generally, the flow requirement of the pipeline with insufficient flow is met, and larger electric energy waste can be caused.
The method for solving the hydraulic imbalance of the central air-conditioning system mainly adopts a static hydraulic balance valve and a dynamic hydraulic balance valve to realize the flow distribution regulation of the central air-conditioning water system at present. The main purpose of the static balancing valve is to ensure that the end devices reach the design flow rate at the same time, but since the actual energy supply load of the air conditioner will vary with the outdoor environment and the flow of people, the end devices do not need to reach the design flow rate for most of the time. The dynamic balance valve is mainly used for ensuring that when the characteristics of other branch pipelines of the system are changed due to the change of an external environment, the pressure difference is kept unchanged or the loop flow of the dynamic balance valve per se is kept unchanged through the opening degree of the regulating valve. The essence of the static balance valve and the dynamic balance valve is to solve the problem of hydraulic balance of the pipeline part of the air-conditioning water system by adjusting local pipeline resistance, but for a fan coil system provided with the electric two-way valve, due to the fact that requirements of cold and hot loads and flow at the tail end are uncertain, accurate hydraulic balance adjustment of the static balance valve and the dynamic balance valve is difficult to perform.
Disclosure of Invention
The invention provides a dynamic hydraulic balance adjusting method and device for a central air conditioning system, which are used for solving the problems of uneven indoor temperature and energy waste caused by hydraulic imbalance in the operation process of the current central air conditioning system.
To achieve the above objects, according to one aspect of the present invention, a method for adjusting a dynamic hydraulic balance of a central air conditioning system is provided. The method comprises the following steps: acquiring running data of each fan coil of a central air-conditioning system, acquiring indoor environment data of a room corresponding to each fan coil, acquiring outdoor environment data, and acquiring water supply temperature data of a main pipe of the central air-conditioning system; setting a target indoor environment state of each fan coil of the central air-conditioning system corresponding to a room; calculating a control parameter curve of the central air-conditioning system according to the target indoor environment state of the room corresponding to each fan coil and the water supply temperature data of the central air-conditioning main pipe, wherein the control parameter curve comprises a control parameter curve of an electric two-way valve of each fan coil, a wind speed setting parameter curve of each fan coil and a water supply and return pressure difference control parameter curve of the central air-conditioning main pipe; and controlling the central air-conditioning system to operate according to the control parameter curve.
Further, acquire each fan coil operation data of central air conditioning system, acquire the indoor environmental data that each fan coil corresponds, acquire outdoor environmental data, include: the operation data of each fan coil of the central air-conditioning system comprises but is not limited to the state data of an electric two-way valve of each fan coil and the wind speed gear data of each fan coil; the indoor environment data of the room corresponding to each fan coil comprises one or more of but not limited to indoor temperature data, indoor humidity data and indoor wind speed data; the outdoor environment data comprises one or more of outdoor temperature data, outdoor humidity data, outdoor wind speed data and outdoor illumination intensity.
Further, the setting of the target indoor environment state of the room corresponding to each fan coil of the central air-conditioning system includes: the target indoor environment state is indoor environment data expected to be achieved through operation of the central air conditioning system, and may include one or more of indoor temperature, indoor humidity and indoor comfort. The target indoor environment state may be set according to a thermal comfort level interval defined by ASHRAE, or may be directly set by a user. Since the ASHRAE-defined thermal comfort interval takes into account the average of most users, and each user is accustomed differently, the actual comfort range may differ slightly. Therefore, the preset target indoor environment can be adjusted according to the requirements of the user.
Further, the calculating a control parameter curve of the central air conditioning system according to the target indoor environment state of the room corresponding to each fan coil and the water supply temperature data of the central air conditioning main pipe comprises: calculating target cooling capacity or heating capacity of each fan coil according to the target indoor environment state of the room corresponding to each fan coil; and calculating a control parameter curve of the central air-conditioning system according to the target cooling capacity or heating capacity of each fan coil and the water supply temperature data of the central air-conditioning main pipe, wherein the control parameter curve comprises a control parameter curve of each electric two-way valve of each fan coil, a wind speed setting curve of each fan coil and a water supply and return pressure difference control parameter curve of the central air-conditioning main pipe.
Further, the calculating the target cooling capacity or heating capacity of each fan coil includes: establishing an indoor load model, and calculating the heat exchange quantity of the fan coil which meets the indoor load requirement corresponding to each fan coil; and calculating the heat exchange quantity of each fan coil meeting the indoor load requirement in a certain time, namely the target cooling capacity or heating capacity of each fan coil.
Further, the calculating the control parameter curve of the central air-conditioning system according to the target cooling capacity or heating capacity of each fan coil and the water supply temperature of the central air-conditioning main pipe, comprises:
establishing a fan coil cold supply or heat supply model, and calculating the relationship between the fan coil cold supply or heat supply and the fan coil water flow and fan coil wind speed setting:
Q＝f(v,L,ΔP,Tr，HrTw)
wherein Q ═ Q1，Q2，…，Qn]To provide cooling or heating capacity for the fan coil,L＝[L1，L2，…，Ln]for each fan coil wind speed set point, TrRoom temperature of the corresponding area of the fan coil, HrIndoor humidity, T, for the area corresponding to the fan coilwThe temperature of the water supply for the central air-conditioning main pipe.
Establishing a fan coil water flow model, and calculating the relationship between the fan coil water flow and the states of the electric two-way valves of the fan coils and the pressure difference of supply water and return water of the central air conditioner:
v＝f(φ，ΔP)
in the formula,φ＝[φ1，φ2，…，φn]the control parameters of all the fan coil electric two-way valves connected with the central air-conditioning system, delta P represents the pressure difference of the main pipe of the central air-conditioning system for supplying and returning water,v＝[v1，v2，…，vn]and calculating the water flow of all the fan coils for the model.
Establishing a central air conditioning system control model according to the fan coil cooling or heating model and the fan coil water flow model, wherein the central air conditioning system control model is expressed by a formula:
the control vector is: x ═ phi2,Lt,ΔPt}
The objective function is:
or
The constraint function is:
in the formula, ∑ PtIs the sum of the power of a central air-conditioning water system and a tail end fan coil at the time t, CtElectricity price at time t, Qi，tFor the cooling or heating capacity, Q, of each fan coil at time ti，setFor the target cooling or heating capacity, t, of each fan coil0To calculate the start time, Δ t is the control period, t is t0To t0At any time between + Δ t.
In order to achieve the above object, according to another aspect of the present invention, a dynamic hydraulic balance adjustment device for a central air conditioning system is provided. The device includes: the central air-conditioning system comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring operation data of each fan coil of the central air-conditioning system, indoor environment data and outdoor environment data of a room corresponding to each fan coil and water supply temperature data of a central air-conditioning main pipe; the setting unit is used for setting a target indoor environment state of a room corresponding to each fan coil of the central air-conditioning system; the first calculation unit is used for calculating a control parameter curve of the central air-conditioning system according to the target indoor environment state of the room corresponding to each fan coil and the water supply temperature data of the central air-conditioning main pipe; and the control unit is used for controlling the operation of the central air-conditioning system according to the control parameter curve.
Further, the fan coil operation data acquired by the acquisition unit includes, but is not limited to, electric two-way valve state data of each fan coil and wind speed gear data of each fan coil; the indoor environment data of the room corresponding to each fan coil comprises one or more of but not limited to indoor temperature data, indoor humidity data and indoor wind speed data; the outdoor environment data comprises one or more of outdoor temperature data, outdoor humidity data, outdoor wind speed data and outdoor illumination intensity.
Furthermore, the setting unit sets the target indoor environment state of the room corresponding to each fan coil of the central air-conditioning system, and the setting unit comprises: the target indoor environment state is indoor environment data expected to be achieved through operation of the central air conditioning system, and may include one or more of indoor temperature, indoor humidity and indoor comfort. The target indoor environment state may be set according to a thermal comfort level interval defined by ASHRAE, or may be directly set by a user. Since the ASHRAE-defined thermal comfort interval takes into account the average of most users, and each user is accustomed differently, the actual comfort range may differ slightly. Therefore, the preset target indoor environment can be adjusted according to the requirements of the user.
Further, the first calculation unit includes: the first calculation module is used for calculating the target cooling capacity or heating capacity of each fan coil of the central air-conditioning system; wherein, the target cooling capacity or heating capacity of each fan coil corresponds to the target indoor environment state of the corresponding room; and the second calculation module is used for calculating a control parameter curve of the central air-conditioning system according to the target cooling or heating capacity of each fan coil and the water supply temperature data of the central air-conditioning main pipe, wherein the control parameter curve comprises a control parameter curve of each fan coil electric two-way valve, a wind speed setting curve of each fan coil and a water supply and return pressure difference control parameter curve of the central air-conditioning main pipe, and the control parameter curve of each fan coil electric two-way valve, the wind speed setting curve of each fan coil and the water supply and return pressure difference control parameter curve of the central air-conditioning main pipe are used for controlling the electric two-way valve, the wind speed setting of the fan coils and the water supply and return pressure difference of the.
According to the invention, the running data of each fan coil of the central air-conditioning system is acquired, the indoor environment data of a room corresponding to each fan coil is acquired, the outdoor environment data is acquired, and the water supply temperature data of the central air-conditioning main pipe is acquired; setting a target indoor environment state of each fan coil of the central air-conditioning system corresponding to a room; calculating the target cooling capacity or heating capacity of each fan coil of the central air-conditioning system; and calculating a control parameter curve of the central air-conditioning system according to the target cooling capacity or heating capacity of each fan coil, and controlling the central air-conditioning system according to the control parameter curve to realize accurate hydraulic balance adjustment of the central air-conditioning system. The problem of the cold and hot unevenness of indoor temperature and the energy waste that causes from this that the hydraulic power imbalance in the operation of current central air conditioning system caused is solved, and then reached and satisfied user's comfort level demand on the basis of more energy-conserving.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention, in which:
fig. 1 is a schematic diagram of a dynamic hydraulic balance adjustment device of a central air conditioning system according to an embodiment of the invention.
Fig. 2 is a schematic flow chart of a dynamic hydraulic balance adjustment method of a central air conditioning system according to an embodiment of the invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail with reference to examples.
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments of the present invention, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in other sequences than those illustrated or otherwise described herein. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.
Fig. 1 is a schematic diagram of a dynamic hydraulic balance adjustment device of a central air conditioning system according to an embodiment of the invention.
As shown in fig. 1, the apparatus includes: an acquisition unit 10, a setting unit 20, a first calculation unit 30, and a control unit 40.
The acquiring unit 10 may be configured to acquire operation data of each fan coil of the central air conditioning system, indoor environment data of a room corresponding to each fan coil, outdoor environment data, and water supply temperature data of a main pipe of the central air conditioning system.
It should be noted that, the operation data of each fan coil of the central air-conditioning system can be obtained through a central air-conditioning autonomous system, and the operation data includes, but is not limited to, the status data of the electric two-way valve of each fan coil, and the wind speed gear data of each fan coil; indoor environment data of a room corresponding to each fan coil can be acquired through a central air-conditioning automatic control system or a temperature and humidity sensor is arranged indoors, wherein the data comprises but is not limited to one or more of indoor temperature data, indoor humidity data and indoor wind speed data; the outdoor environment data may be obtained by an outdoor sensor, and the data may include, but is not limited to, one or more of outdoor temperature data, outdoor humidity data, outdoor wind speed data, and outdoor light intensity. Specifically, the data may be detected and acquired in real time, or may be acquired once every preset time period. After the data are acquired, the data can be stored in a corresponding memory according to the corresponding relation of the data and the time.
The setting unit 20 may be configured to set a target indoor environment state of a room corresponding to each fan coil of the central air conditioning system.
It should be noted that the target indoor environment state is indoor environment data expected to be achieved through the operation of the central air conditioning system, and may include one or more of indoor temperature, indoor humidity and indoor comfort level. The target indoor environment state may be set according to a thermal comfort level interval defined by ASHRAE, or may be directly set by a user. Since the ASHRAE-defined thermal comfort interval takes into account the average of most users, and each user is accustomed differently, the actual comfort range may differ slightly. Therefore, the preset target indoor environment can be adjusted according to the requirements of the user.
The first calculating unit 30 may be configured to calculate a control parameter curve of the central air conditioning system according to the target indoor environment state of the room corresponding to each fan coil and the water supply temperature data of the central air conditioning main pipe, where the control parameter curve of the central air conditioning system includes a control parameter curve of an electric two-way valve of each fan coil, a wind speed setting curve of each fan coil, and a water supply and return pressure difference control parameter curve of the central air conditioning main pipe.
The control parameter curve of the electric two-way valve of each fan coil, the air speed setting curve of each fan coil and the control parameter curve of the water supply and return pressure difference of the central air-conditioning main pipe are used for controlling the central air-conditioning system to dynamically adjust the electric two-way valve of each fan coil, the air speed gear of each fan coil and the water supply and return pressure difference of the central air-conditioning main pipe under the preset target indoor environment state so as to realize the dynamic hydraulic balance of the central air-conditioning system. In other words, the target indoor environment can be achieved or maintained by dynamically adjusting the electric two-way valve, the wind speed gear of the fan coil and the water supply and return pressure difference of the central air-conditioning main pipe, and the dynamic flow of each fan coil can meet the comfort level requirement of each room by controlling and adjusting the electric two-way valve and the water supply and return pressure difference of the central air-conditioning main pipe under the condition of minimum required electricity cost.
After the data of the acquisition unit are obtained and the set target indoor environment state is obtained, an optimization control algorithm can be called to determine a control parameter curve of each fan coil electric two-way valve of the central air-conditioning system, a wind speed setting curve of each fan coil and a water supply and return pressure difference control parameter curve of a central air-conditioning main pipe. It should be noted that the control parameter curve of the electric two-way valve, the wind speed setting curve of the fan coil and the control parameter curve of the pressure difference between the supply water and the return water of the central air-conditioning main pipe can be described by control curves or can be described by lists.
The control unit 40 can be used for controlling the electric two-way valve of each fan coil, the air speed setting of the fan coil and the water supply and return pressure difference operation of the central air-conditioning main pipe of the central air-conditioning system, and controlling a parameter curve of each electric two-way valve of each fan coil, a setting curve of each air speed of the fan coil and a control parameter curve of the water supply and return pressure difference of the central air-conditioning main pipe.
According to the embodiment of the invention, when the indoor environment is controlled, the central air-conditioning system can enable the indoor environment to reach the set requirement by adjusting the electric two-way valve of each fan coil, the air speed setting of the fan coil and the water supply and return pressure difference of the main pipe of the central air-conditioning, and the calculation method enables the electricity consumption to be minimum, thereby achieving the purposes of simultaneously controlling the indoor environment and considering the energy-saving effect.
Preferably, in the embodiment of the present invention, the first calculation unit 30 may include: the device comprises a first calculation module and a second calculation module.
The first calculation module can be used for calculating the target cooling capacity or heating capacity of each fan coil of the central air-conditioning system; wherein, the target cooling capacity or heating capacity of each fan coil corresponds to the target indoor environment state of the corresponding room.
And the second calculation module is used for calculating a control parameter curve of the central air-conditioning system according to the target cooling or heating capacity of each fan coil and the water supply temperature data of the central air-conditioning main pipe, wherein the control parameter curve comprises a control parameter curve of each fan coil electric two-way valve, a wind speed setting curve of each fan coil and a water supply and return pressure difference control parameter curve of the central air-conditioning main pipe, and the control parameter curve of each fan coil electric two-way valve, the wind speed setting curve of each fan coil and the water supply and return pressure difference control parameter curve of the central air-conditioning main pipe are used for controlling the electric two-way valve, the wind speed setting of each fan coil and the water supply and return pressure difference of the central.
The target cooling capacity or heating capacity of each fan coil of the central air-conditioning system calculated by the first calculating module is used for the calculation process of the control parameter curve of each fan coil electric two-way valve, the wind speed setting curve of each fan coil and the water supply and return pressure difference of the central air-conditioning main pipe of the second calculating module.
Further, the first calculation module comprises a model submodule and a calculation submodule.
And furthermore, the model submodule is used for calculating the relation between the cooling capacity or the heating capacity of each fan coil and the indoor environment state, and the module adopts an indoor load model.
And further, the calculation submodule is used for calculating the heat supply quantity or the cold supply quantity of each fan coil meeting the indoor target environment state.
Preferably, the model submodule calculates the target cooling capacity or heating capacity of each fan coil by using an indoor load model. The indoor load may be expressed as:
Qc＝(Qi+Qt+ΔHf)
in the formula, QcFor indoor loads, QiLoad constructed for indoor heat source, QtLoad, Δ H, for outdoor heat sourcefIs the load formed by fresh air, wherein QtAnd Δ HfAre related to the indoor environmental conditions. To maintain indoor environmentAnd the fan coil can meet the indoor load requirement by supplying cold or heat, namely:
Qf＝-Qc
and when the indoor environment state is an indoor target environment state, the cooling capacity or the heating capacity of the fan coil meeting the indoor load requirement is the target cooling capacity or the heating capacity of the fan coil.
The second calculation module is used for calculating an electric two-way valve of each fan coil of the central air-conditioning system, fan coil air speed setting and a central air-conditioning system water inlet and return pressure difference control parameter curve, wherein the electric two-way valve and the fan coil air speed setting of each fan coil realize target cooling capacity or heating capacity of each fan coil.
Further, the second calculation module comprises a model submodule and a control parameter calculation submodule.
Furthermore, the model submodule comprises a fan coil cooling or heating model, a fan coil water flow model and a central air conditioning system control model.
Preferably, the fan coil cooling or heating model is a relationship between fan coil cooling or heating capacity and fan coil water flow and fan coil air speed settings:
Q＝f(v,L,ΔP,Tr,Hr,Tw)
wherein,Q＝[Q1，Q2，…，Qn]to provide cooling or heating capacity for the fan coil,L＝[L1，L2，…，Ln]for each fan coil wind speed set point, TrRoom temperature of the corresponding area of the fan coil, HrIndoor humidity, T, for the area corresponding to the fan coilwThe temperature of the water supply for the central air-conditioning main pipe.
Preferably, the fan coil water flow model is a relationship between fan coil water flow and the central air conditioning system control parameters. The model included in the module is a relation model between the water flow of the fan coil, the state of each fan coil electric two-way valve and the supply and return water pressure difference of the central air conditioner. The water flow of each fan coil is not only related to the state of the electric two-way valve of the fan coil, but also related to the states of the electric two-way valves of other fan coils connected with the central air-conditioning system and the water supply and return pressure difference of a main pipe of the central air-conditioning system. That is, the water flow rate of each fan coil is related to the states of the electric two-way valves of all the fan coils connected with the central air-conditioning system and the pressure difference of the main water supply and return of the central air-conditioning system, and can be expressed as the following functions:
v＝f(φ，ΔP)
in the formula,φ＝[φ1，φ2，…，φn]controlling parameters of all fan coil electric two-way valves connected with the central air-conditioning system, wherein delta user represents the pressure difference of water supply and return of a main pipe of the central air-conditioning system,v＝[v1，v2，…，vn]and calculating the water flow of all the fan coils for the model.
Preferably, the central air-conditioning system control model is used for calculating the central air-conditioning system control parameters which meet the target indoor environment state of the room corresponding to each fan coil of the central air-conditioning system and meet the lowest energy consumption or energy cost of the air conditioner. The central air-conditioning system control model is formulated as:
the control vector is: x ═ phi2,Lt,ΔPt}
The objective function is:
or
The constraint function is:
in the formula, ∑ PtIs the sum of the power of a central air-conditioning water system and a tail end fan coil at the time t, CtElectricity price at time t, Qi，tFor the cooling or heating capacity, Q, of each fan coil at time ti，setFor the target cooling or heating capacity, t, of each fan coil0To calculate the start time, Δ t is the control period, t is t0To t0Arbitrary time between + Δ tAnd (6) engraving.
Further, Σ Pt in the formula can be represented as:
∑Pt＝∑PLi,t+Psys,ti＝1,2,…N
in the formula, PLi，tFan power for the ith fan coil at time t as a function of fan speed, i.e. PLi，t＝f(Li)，Psys，tFor the energy consumption of the central air conditioning water system at time t, in this embodiment, the energy consumption can be calculated by the following formula:
in the formula,. DELTA.PtFor the pressure difference of the water supply and return main pipe at the time t, vi，tThe water flow rate for each fan coil at time t, η is the water pump system efficiency.
Preferably, the calculation sub-module calculates the central air-conditioning system control parameter curve according to the central air-conditioning system control model. The optimization calculation of the calculation submodule adopts a rolling optimization mode and starts from the calculation starting time t0Time to final state t0+ Δ t is divided into K time intervals, corresponding manipulated variables and intermediate variablesφ j、L j，ΔPjJ is 1, 2, … …, K, which is recalculated at intervals later to update the control curve.
According to the embodiment of the invention, the dynamic hydraulic balance adjusting method of the central air-conditioning system is provided and is used for dynamically adjusting the hydraulic balance of the central air-conditioning system and ensuring the indoor comfort requirement. The dynamic hydraulic balance adjusting method of the central air-conditioning system can be operated on computer processing equipment. It should be noted that the dynamic hydraulic balance adjustment method for the central air conditioning system according to the embodiment of the present invention may be implemented by the dynamic hydraulic balance adjustment device for the central air conditioning system according to the embodiment of the present invention, and the dynamic hydraulic balance adjustment device for the central air conditioning system according to the embodiment of the present invention may also be used to implement the dynamic hydraulic balance adjustment method for the central air conditioning system according to the embodiment of the present invention.
Fig. 2 is a flowchart of a dynamic hydraulic balance adjustment method of a central air conditioning system according to an embodiment of the present invention.
As shown in fig. 2, the method includes steps S202 to S208 as follows:
step S202, obtaining operation data of each fan coil of the central air-conditioning system, indoor environment data and outdoor environment data of a room corresponding to each fan coil, and water supply temperature data of a central air-conditioning main pipe.
It should be noted that, the operation data of each fan coil of the central air-conditioning system can be obtained through a central air-conditioning autonomous system, and the operation data includes, but is not limited to, the status data of the electric two-way valve of each fan coil, and the wind speed gear data of each fan coil; indoor environment data of a room corresponding to each fan coil can be acquired through a central air-conditioning automatic control system or a temperature and humidity sensor is arranged indoors, wherein the data comprises but is not limited to one or more of indoor temperature data, indoor humidity data and indoor wind speed data; the outdoor environment data may be obtained by an outdoor sensor, and the data may include, but is not limited to, one or more of outdoor temperature data, outdoor humidity data, outdoor wind speed data, and outdoor light intensity. Specifically, the data may be detected and acquired in real time, or may be acquired once every preset time period. After the data are acquired, the data can be stored in a corresponding memory according to the corresponding relation of the data and the time.
And step S204, setting a target indoor environment state of each fan coil of the central air-conditioning system corresponding to a room.
It should be noted that the target indoor environment state is indoor environment data expected to be achieved through the operation of the central air conditioning system, and may include one or more of indoor temperature, indoor humidity and indoor comfort level. The target indoor environment state may be set according to a thermal comfort level interval defined by ASHRAE, or may be directly set by a user. Since the ASHRAE-defined thermal comfort interval takes into account the average of most users, and each user is accustomed differently, the actual comfort range may differ slightly. Therefore, the preset target indoor environment can be adjusted according to the requirements of the user.
And S206, calculating a control parameter curve of the central air-conditioning system according to the target indoor environment state of the room corresponding to each fan coil and the water supply temperature data of the central air-conditioning main pipe, wherein the control parameter curve of the central air-conditioning system comprises a control parameter curve of an electric two-way valve of each fan coil, a wind speed setting curve of each fan coil and a water supply and return pressure difference control parameter curve of the central air-conditioning main pipe.
The control parameter curve of the electric two-way valve of each fan coil, the wind speed setting curve of each fan coil and the control parameter curve of the water supply and return pressure difference of the central air-conditioning main pipe are used for controlling the central air-conditioning system to dynamically adjust the electric two-way valve of each fan coil, the wind speed gear of each fan coil and the water supply and return pressure difference of the central air-conditioning main pipe under the preset target indoor environment state so as to realize the dynamic hydraulic balance of the central air-conditioning system. In other words, the target indoor environment can be achieved or maintained by dynamically adjusting the electric two-way valve, the fan coil air speed gear and the central air-conditioning main pipe water supply and return pressure difference of each fan coil, and the dynamic flow of each fan coil can meet the comfort level requirement of each room by controlling and adjusting the electric two-way valve, the fan coil air speed gear and the central air-conditioning main pipe water supply and return pressure difference under the condition of minimum required energy consumption or minimum energy cost.
After all the data of the acquisition unit and the set target environment state are obtained, an optimization control optimization algorithm can be called to determine a control parameter curve of each fan coil electric two-way valve of the central air-conditioning system, a wind speed setting curve of each fan coil and a water supply and return pressure difference control parameter curve of a central air-conditioning main pipe. It should be noted that the control parameter curve of the electric two-way valve, the wind speed setting curve of each fan coil and the supply and return water pressure difference control parameter curve of the central air-conditioning main pipe can be described by using control curves or can be described by using lists.
And S208, controlling each fan coil electric two-way valve, each fan coil fan gear and the central air-conditioning main pipe water supply and return pressure difference operation of each fan coil electric two-way valve control parameter curve, each fan coil air speed setting curve and the central air-conditioning main pipe water supply and return pressure difference control parameter curve of the central air-conditioning system.
By the embodiment of the invention, when the indoor environment is controlled, the central air-conditioning system can ensure that the indoor environment meets the set requirement by adjusting the electric two-way valve of each fan coil, the wind speed gear of each fan coil and the water supply and return pressure difference of the main pipe of the central air-conditioning, and the purposes of simultaneously controlling the indoor environment and giving consideration to the energy-saving effect are achieved, wherein the energy consumption is minimum or the energy cost is minimum.
Preferably, in an embodiment of the present invention, calculating a control parameter curve of the central air conditioning system according to the target indoor environment state of the room corresponding to each fan coil and the central air conditioning main water supply temperature data may include:
and S2, calculating the target load of the room corresponding to each fan coil according to the currently acquired indoor environment data, outdoor environment data, main pipe water supply temperature data of the central air-conditioning system and the set target indoor environment state of the room corresponding to each fan coil.
And S4, calculating the target cooling capacity or heating capacity of each fan coil according to the target load of the room corresponding to each fan coil. The target cooling capacity or heating capacity of each fan coil needs to meet the target load requirement of the room corresponding to each fan coil.
It should be noted that, in the embodiment of the present invention, it is necessary to perform S2 and S4 calculations on all fan coils connected to the central air conditioning system to obtain target cooling or heating amounts Q of all the fan coilsset，Qset＝[Qi，set，i＝1，2，…，N]。
And S6, calculating control parameter curves of the central air-conditioning system according to the target cooling or heating capacity of each fan coil and the water supply temperature data of the central air-conditioning main pipe, wherein the control parameter curves comprise control parameter curves of the electric two-way valves of each fan coil, air speed setting curves of each fan coil and water supply and return pressure difference control curves of the central air-conditioning main pipe, and the control parameter curves of the electric two-way valves of each fan coil, the air speed setting curves of each fan coil and the water supply and return pressure difference control parameter curves of the central air-conditioning main pipe are used for controlling the electric two-way valves, the fan gears and the water supply and return pressure difference of the central air.
Specifically, in the embodiment of the invention, the target indoor environment can be maintained by dynamically adjusting the states of the electric two-way valves of the fan coils, the wind speeds of the fan coils and the pressure difference of the supply water and the return water of the main pipe in a period of time through an optimization algorithm, and the minimum electricity charge is met. The optimization algorithm for optimizing control is as follows:
the control vector is: x ═ phi2,Lt,ΔPt}
The objective function is:
or
The constraint function is:
in the formula,. DELTA.PtFor the pressure difference of the water supply and return main pipe at the time t, vi，tWater flow for each fan coil at time t, η Water Pump System efficiency, PLtFan power of each fan coil at time t, CtElectricity price at time t, Qi，tFor the cooling or heating capacity, Q, of each fan coil at time tt，setFor the target cooling or heating capacity, t, of each fan coil0To calculate the start time, Δ t is the control period, t is t0To t0At any time between + Δ t.
Calculating the objective function and the constraint function according to the control vector comprises:
s62, calling the fan coil water flow model, and calculating the relationship between the states of the electric two-way valves of the fan coils, the water supply and return pressure difference of the central air-conditioning main pipe and the fan coil water flow, namely:
v＝f(φ,ΔP)
in the formula,φ＝[φ1，φ2，…，φn]the control parameters of all the fan coil electric two-way valves connected with the central air-conditioning system, delta P represents the pressure difference of the main pipe of the central air-conditioning system for supplying and returning water,v＝[v1，v2，…，vn]and calculating the water flow of all the fan coils for the model.
S64, calling the fan coil cooling or heating model, and calculating the relationship between the fan coil water flow, the fan coil wind speed setting and the fan coil cooling or heating, namely:
Q＝f(v,L,ΔP,Tr,Hr,Tw)
wherein Q ═ Q1，Q2，…，Qn]To provide cooling or heating capacity for the fan coil,L＝[L1，L2，…，Ln]setting the wind speed of each fan coil, wherein delta P represents the pressure difference between the main pipe of the central air-conditioning system and the supply water and the return water, TrRoom temperature of the corresponding area of the fan coil, HrIndoor humidity, T, for the area corresponding to the fan coilwThe temperature of the water supply for the central air-conditioning main pipe.
S66, calculating fan powers of all fan coils connected to the central air conditioning system, and calculating the fan powers of the fan coils according to the fan coil wind speed data may be represented as:
PL＝f(L)
it should be noted that the steps illustrated in the flowcharts of the figures may be performed in a computer system such as a set of computer-executable instructions and that, although a logical order is illustrated in the flowcharts, in some cases, the steps illustrated or described may be performed in an order different than presented herein.
It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and they may alternatively be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, or fabricated separately as individual integrated circuit modules, or fabricated as a single integrated circuit module from multiple modules or steps. Thus, the present invention is not limited to any specific combination of hardware and software.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (1)
1. A dynamic hydraulic balance adjusting device of a central air conditioning system is characterized by comprising:
the central air-conditioning system comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring operation data of each fan coil of the central air-conditioning system, indoor environment data and outdoor environment data of a room corresponding to each fan coil and water supply temperature data of a central air-conditioning main pipe;
the setting unit is used for setting a target indoor environment state of a room corresponding to each fan coil of the central air-conditioning system;
the first calculation unit is used for calculating a control parameter curve of the central air-conditioning system according to the target indoor environment state of the room corresponding to each fan coil and the water supply temperature data of the central air-conditioning main pipe, wherein the control parameter curve comprises a control parameter curve of each electric two-way valve of each fan coil, a wind speed setting parameter curve of each fan coil and a water supply and return pressure difference control parameter curve of the central air-conditioning main pipe; and
the control unit controls the operation of the central air-conditioning system according to the control parameter curve;
the first calculation unit includes: the first calculation module is used for calculating the target cooling capacity or heating capacity of each fan coil of the central air-conditioning system; wherein, the target cooling capacity or heating capacity of each fan coil corresponds to the target indoor environment state of the corresponding room; the second calculation module is used for calculating a control parameter curve of the central air-conditioning system according to the target cooling capacity or heating capacity of each fan coil and the water supply temperature data of the central air-conditioning main pipe;
the second computing module, comprising: the model submodule is used for calculating the relation between target cooling capacity or heating capacity of the fan coil and control parameters of the central air-conditioning system; the control parameter calculation submodule is used for calculating a control parameter curve meeting the dynamic hydraulic balance of the central air-conditioning system by utilizing a model in the model submodule;
the method for realizing the dynamic hydraulic balance adjustment of the central air-conditioning system by the device comprises the following steps:
acquiring running data of each fan coil of a central air-conditioning system, acquiring indoor environment data of a room corresponding to each fan coil, acquiring outdoor environment data, and acquiring water supply temperature data of a main pipe of the central air-conditioning system;
setting a target indoor environment state of each fan coil of the central air-conditioning system corresponding to a room;
calculating a control parameter curve of the central air-conditioning system according to the target indoor environment state of the room corresponding to each fan coil and the water supply temperature data of the central air-conditioning main pipe, wherein the control parameter curve comprises a control parameter curve of an electric two-way valve of each fan coil, a wind speed setting parameter curve of each fan coil and a water supply and return pressure difference control parameter curve of the central air-conditioning main pipe; and are
Controlling the central air-conditioning system to operate according to the control parameter curve;
calculating a control parameter curve of the central air-conditioning system according to the target indoor environment state of the room corresponding to each fan coil and the water supply temperature data of the central air-conditioning main pipe, wherein the control parameter curve comprises the following steps:
calculating the target cooling capacity or heating capacity of each fan coil of the central air-conditioning system;
calculating a control parameter curve of the central air-conditioning system according to the target cooling capacity or heating capacity of each fan coil and the water supply temperature of the central air-conditioning main pipe;
calculating the target cooling capacity or heating capacity of each fan coil of the central air-conditioning system, comprising the following steps:
establishing an indoor load model, and calculating the heat exchange quantity of the fan coil which meets the indoor load requirement corresponding to each fan coil;
in a certain time, the heat exchange quantity of the fan coil meeting the indoor load requirement is the target cooling or heating quantity of the fan coil; calculating a control parameter curve of the central air-conditioning system according to the target cooling capacity or heating capacity of each fan coil and the water supply temperature data of the central air-conditioning main pipe, wherein the control parameter curve comprises the following steps:
establishing a fan coil cold supply or heat supply model, and calculating the relationship between the cold supply amount or the heat supply amount of each fan coil and the water flow and the air speed setting of each fan coil;
establishing a fan coil water flow model, and calculating a relation model between each fan coil water flow and the states of each fan coil electric two-way valve and the supply-return water pressure difference of a central air-conditioning main pipe;
establishing a central air-conditioning system control model according to the fan coil cooling or heating model, the fan coil water flow model, a relation model between the fan coil electric two-way valve state, the fan coil air speed setting and the central air-conditioning water supply and return pressure difference;
calculating a control parameter curve of the central air-conditioning system according to the control model of the central air-conditioning system;
the central air conditioning system control model includes:
the control model decision variables are the states of the electric two-way valves of the fan coils, the wind speed setting of the fan coils and the water supply and return pressure difference of the central air-conditioning main pipe in a period of time;
establishing a target function according to the energy consumption of the central air-conditioning system or the energy cost of the central air-conditioning system;
establishing a constraint function according to the target cooling capacity or heating capacity of each fan coil, the state of the electric two-way valve of each fan coil, the wind speed setting of each fan coil and the water supply and return pressure difference of the central air-conditioning main pipe;
and establishing the control model by combining the decision variables, the objective function and the constraint function.
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| CN202010455726.XA Withdrawn CN111520889A (en) | 2016-01-26 | 2016-01-26 | Dynamic hydraulic balance adjusting device of central air conditioning system |
| CN202010454728.7A Withdrawn CN111520888A (en) | 2016-01-26 | 2016-01-26 | Dynamic hydraulic balance adjusting device of central air conditioning system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111520889A (en) * | 2016-01-26 | 2020-08-11 | 熊火平 | Dynamic hydraulic balance adjusting device of central air conditioning system |
| CN112484250A (en) * | 2020-11-16 | 2021-03-12 | 东南大学 | HVAC (heating ventilation and ventilation air conditioning) online monitoring system based on indoor heat source information and control method |
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| US11486597B2 (en) * | 2019-04-03 | 2022-11-01 | Chicony Power Technology Co., Ltd. | Control method for air conditioning system |
| CN110701361A (en) * | 2019-10-28 | 2020-01-17 | 上海庄生机电工程设备有限公司 | Method for solving hydraulic balance by utilizing equal-percentage valve characteristic curve |
| CN112665102A (en) * | 2020-12-25 | 2021-04-16 | 江苏联宏智慧能源股份有限公司 | Fan coil control method based on cold quantity calculation |
| CN116085952B (en) * | 2023-01-30 | 2024-02-23 | 武汉大学 | Energy-saving calculation method, energy-saving controller, terminal and medium for split air conditioner |
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Also Published As
| Publication number | Publication date |
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| CN111520888A (en) | 2020-08-11 |
| CN105674487B (en) | 2020-11-13 |
| CN105674487A (en) | 2016-06-15 |
| CN111520889A (en) | 2020-08-11 |
| CN111520886A (en) | 2020-08-11 |
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