CN115183352B - PMV-based buried pipe direct-supply floor radiation cooling control method and device - Google Patents

PMV-based buried pipe direct-supply floor radiation cooling control method and device Download PDF

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CN115183352B
CN115183352B CN202210933300.XA CN202210933300A CN115183352B CN 115183352 B CN115183352 B CN 115183352B CN 202210933300 A CN202210933300 A CN 202210933300A CN 115183352 B CN115183352 B CN 115183352B
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pmv
indoor
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floor
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CN115183352A (en
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刘吉营
任婧
苏蒙
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Shandong Jianzhu University
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
    • F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/89—Arrangement or mounting of control or safety devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/20—Humidity
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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Abstract

The invention discloses a PMV-based control method and device for directly supplying floor radiation and cooling for a buried pipe, wherein the control method comprises the following steps: collecting indoor environment parameters such as floor surface temperature, dry bulb temperature, relative humidity, air flow speed, average radiation temperature and the like, setting the thermal resistance of clothes and the activity intensity of personnel as constant values, and calculating a PMV value; adopting an indoor environment dynamic heat-humidity model to predict a PMV value; setting control rules for the operation of the cooling system by taking the lowest energy consumption of the floor radiation and ventilation combined cooling system as an objective function and taking the indoor comfort index PMV threshold range as a constraint condition; and determining the opening time of the ventilation system and the floor radiation system, and controlling the indoor thermal comfort index PMV by adjusting the sensible heat load bearing proportion of the ventilation system and the floor radiation system according to the interval where the PMV value is located. The invention improves the regulation and control efficiency and accuracy by adjusting the sensible heat load bearing proportion of the ventilation system and the floor radiation system.

Description

PMV-based buried pipe direct-supply floor radiation cooling control method and device
Technical Field
The invention relates to a PMV index-based method and device for controlling radiation and cooling of a buried pipe direct supply floor, and belongs to the technical field of air conditioner optimal control.
Background
The direct radiation cooling of the buried pipe floor is currently considered as a non-ideal cooling mode, the temperature of the floor is controlled to be above 18-20 ℃, the feeling of foot cooling can not be generated in summer, and the requirement of thermal comfort is met. The operation control of the existing floor radiation and ventilation combined cooling system mainly adopts a control method based on temperature, and the thermal sensation of personnel and other indoor environment parameters are not considered. Because the radiation plate surface realizes heat transfer through radiation heat transfer and convection heat transfer mode, so compare with traditional convection mode, the heat travelling comfort under the radiation cooling mode has the difference for indoor temperature setpoint control is difficult to satisfy the heat travelling comfort demand. Most control technologies respectively adjust the water supply flow and the water supply temperature of the floor radiation system and the air supply quantity and the air supply temperature of the ventilation system, and interaction and internal connection in the cooling process of the two systems are not considered, so that the energy efficiency and the control effect of the composite cooling system are poor.
The PMV value is an evaluation index representing the thermal reaction (cold and hot sensation) of the human body, which is proposed by the professor Fan Geer (p.o. Fanger) of denmark, and represents an average of the cold and hot sensation of most people in the same environment. The PMV value can be obtained by estimating the metabolic rate of human activity and the thermal insulation value of the garment, and the following environmental parameters are needed: air temperature, average radiant temperature, relative air flow rate, and air humidity. Related researches show that the PMV-based control comprehensively considers the activity intensity of the human body, the thermal resistance of clothes, the air temperature, the average radiation temperature, the air flow speed and the air humidity, can accurately reflect the direct physiological and psychological reactions of the human body to the indoor thermal environment, and is an effective control method for improving the indoor thermal comfort and reducing the energy consumption. In addition, the cooling load borne by the ventilation system is proved to be a key control parameter of the composite cooling system in the total cooling load ratio. Therefore, the load bearing proportion of the two systems can be reasonably adjusted, and the cooling capacity and the energy saving potential of the systems can be improved.
The indoor thermal comfort index PMV is widely used for evaluating the indoor thermal comfort of a composite cooling system, limits the application space of the PMV, and is necessary to introduce the PMV into the control process to replace indoor temperature and humidity parameters as a new judgment parameter, so that the parallel monitoring control of the indoor temperature and humidity is realized, and an accurate and effective system regulation scheme is implemented. However, research into the load bearing ratio of floor radiant systems to ventilation systems is limited to describing the load bearing ratio changes during cooling or to suggesting specific load bearing ratio ranges that improve the energy efficiency of the system.
Disclosure of Invention
In order to solve the problems of lower energy efficiency and poor control effect of a composite cooling system caused by a traditional control method, the invention provides a PMV (permanent magnet) index-based buried pipe direct-supply floor radiation cooling control method and device, which can improve the regulation and control efficiency and accuracy of the floor radiation and ventilation composite cooling system.
The technical scheme adopted for solving the technical problems is as follows:
on one hand, the embodiment of the invention provides a PMV-based buried pipe direct-supply floor radiation cooling control method, which comprises the following steps:
collecting indoor environment parameters, setting the thermal resistance of clothes and the activity intensity of personnel as constant values and calculating PMV values; the indoor environmental parameters include floor surface temperature, dry bulb temperature, relative humidity, air flow rate, and average radiant temperature;
adopting an indoor environment dynamic heat-humidity model to predict a PMV value;
setting control rules for the operation of the cooling system by taking the lowest energy consumption of the floor radiation and ventilation combined cooling system as an objective function and taking the indoor comfort index PMV threshold range as a constraint condition;
and determining the opening time of the ventilation system and the floor radiation system, and controlling the indoor thermal comfort index PMV by adjusting the sensible heat load bearing proportion of the ventilation system and the floor radiation system according to the interval where the PMV value is located.
As a possible implementation of this embodiment, the PMV threshold range is [ -0.5, 0.5].
As a possible implementation manner of this embodiment, the PMV value is calculated as:
Figure 572941DEST_PATH_IMAGE001
Figure 841111DEST_PATH_IMAGE002
Figure DEST_PATH_IMAGE003
Figure 410501DEST_PATH_IMAGE004
Figure DEST_PATH_IMAGE005
in the method, in the process of the invention,t a is the dry bulb temperature, °c;RHrelative humidity,%;v a air flow rate, m/s;t r is the average radiation temperature, °c;I cl is the thermal resistance of the clothes, clo;Mintensity of human activity, W; w is the mechanical work done by the human body, and is zero and J when sitting still;P a the water vapor partial pressure of the air around the human body is Pa;f cl is the dressing area coefficient;t cl is the garment exterior surface temperature, °c;h c w/(m) is the convective heat transfer coefficient 2 ∙K)。
As a possible implementation manner of this embodiment, the predicting the PMV value by using the indoor environment dynamic heat-humidity model includes:
predicting dry bulb temperature using indoor environment dynamic heat-humidity modelt a Relative humidity ofRHAverage radiation temperaturet r In combination with a determined air flow ratev a Thermal resistance of clothesI cl Intensity of movement of personMCalculating a PMV value;
the indoor environment dynamic heat and humidity model is as follows:
Figure 637083DEST_PATH_IMAGE006
in the method, in the process of the invention,C i the heat capacity of the air node, J/K;T i the temperature of the air node, K;Q surf,i gain, W, of radiation and convection heat for the surface of the enclosure;Q env,i w is the heat transferred to the air nodes through the wall;Q inf,i to penetrate the air-induced thermal gain, W;Q int,i for indoor convection and radiant heat gain (produced by personnel, equipment, lighting, etc.), W;Q solar,i for solar radiant heat gain through the window, W;Q r,i the cooling capacity W is provided for the floor radiation system to the air nodes;Q v,i the cooling capacity W is provided for the ventilation system to the air nodes;
Figure DEST_PATH_IMAGE007
in the method, in the process of the invention,M eff,i the effective moisture capacity of the air node, g/g;ω i the moisture content of the air node is g;W inf,i g, moisture gain due to permeated air;W int,i gain g for indoor moisture;W env g, the moisture transmitted to the air nodes through the wall body; W v,i g, the moisture removed for the ventilation system;
before the working start time of personnel, the gain of indoor heat and moisture is approximately zero, and the outdoor heat and moisture transfer is less, so that only the residual heat and moisture quantity to be removed are considered, and substituted into the formula to solve; in the working time period of personnel, the indoor heat source schedule determines that the outdoor weather is smaller than the indoor heat source, and the outdoor weather parameter changes less in 10 minutes in the acquisition interval, so that the outdoor weather parameter value acquired at present is adopted to substitute the formula for solving.
As a possible implementation manner of this embodiment, the objective optimization function is:
Figure 675447DEST_PATH_IMAGE008
Figure DEST_PATH_IMAGE009
in the method, in the process of the invention,E pump the energy consumption of the circulating water pump is kWh;ρ sw to water supply density of kg/m 3 ；gGravitational acceleration, m/s 2 ；HThe lift of the circulating water pump is m;V sw for supplying water volume flow, m 3 /h；η pump The efficiency of the circulating water pump is;E fan the energy consumption of the fan is kWh;DPis the pressure drop of the fan, pa;ρ a to supply air density of kg/m 3 ；V sa For volume flow of air supply, m 3 /s；η fan The efficiency of the fan is the same; T out is the outdoor air temperature, °c;T set is the setpoint temperature, °c;T out,dew is the outdoor air dew point temperature, °c; d (D)h v J/kg for evaporation enthalpy;ω out g/kg, the moisture content of the outdoor air;ω max is the maximum moisture content set value, g/kg.
The constraint conditions are as follows: starting a precooling process through a floor radiation and ventilation combined cooling system, and requiring a PMV value to fall within a PMV threshold range at the working start time of personnel; the PMV values required to be calculated every 10 minutes during the personnel working period fall within the PMV threshold range.
As a possible implementation manner of this embodiment, the determining the opening time of the ventilation system and the floor radiation system, and controlling the indoor thermal comfort index PMV by adjusting the sensible heat load bearing ratio of the ventilation system and the floor radiation system according to the interval where the PMV value is located, includes:
according to the humidity which needs to be removed indoors, the design air supply temperature and the design air supply quantity of the ventilation system, the required pre-dehumidification time of the ventilation system is calculated, and the opening time of the ventilation system is determined:
Figure 498040DEST_PATH_IMAGE010
in the method, in the process of the invention,tthe pre-dehumidification time, h, is needed by the ventilation system;V sa for volume flow of air supply, m 3 /h；WG, the moisture content to be removed in the room;d in g/kg, the moisture content of indoor air;d sa the air supply moisture content is g/kg.
When the floor surface temperature is higher than the dew point temperature, the floor radiation system is started;
before the working time of the personnel, the sensible heat load bearing proportion S of the ventilation system and the floor radiation system is adjusted according to the PMV value interval corresponding to the predicted working starting time of the personnel v /S R Determining optimal water supply flow, air supply temperature and air supply quantity which meet PMV threshold requirements and have the lowest energy consumption;
in the personnel working time period, according to the PMV value interval after 10 minutes predicted at the current moment, S is adjusted v /S R And determining the optimal air supply temperature and air supply quantity.
As a possible implementation manner of this embodiment, the working time period of the personnel is 9:00-17:00; the floor radiant system and ventilation system shut down time was 17:00.
As a possible implementation of the present embodiment, the sensible heat load bearing ratio S of the ventilation system to the floor radiation system is adjusted v /S R Expressed as:
Figure DEST_PATH_IMAGE011
in the method, in the process of the invention,Q vent. for replacing sensible heat load born by the ventilation system, kW ∙ h;Q RFC sensible heat load borne by the floor radiation system is kW ∙ h;T in is the indoor air temperature, °c;T sa the temperature of the air supply is DEG C;Afor floor surface area, m 2 ；h t W/(m) is the total heat transfer coefficient 2 ∙K)；T op Is the operating temperature, °c;T f is the floor surface temperature, °c.
As a possible implementation manner of this embodiment, the determining the optimal air supply temperature and the air supply amount includes:
at the start of personnel work, the initial operating parameters of the ventilation system are set: designing air supply temperature and air supply quantity, and setting initial operation parameters of a floor radiation system;
if the surface temperature of the floor does not reach the design requirement, the floor radiation cooling system operates at the maximum allowable water supply flow and is maintained unchanged;
if the floor surface temperature reaches the design requirement, the floor radiation cooling system operates at the design water supply flow rate and is kept unchanged.
On the other hand, the embodiment of the invention provides a PMV-based buried pipe direct-supply floor radiation cooling control device, which comprises:
the data acquisition processing module is used for acquiring indoor environment parameters, setting the thermal resistance of clothes and the activity intensity of personnel as constant values and calculating PMV values; the indoor environmental parameters include floor surface temperature, dry bulb temperature, relative humidity, air flow rate, and average radiant temperature;
the PMV value prediction module is used for predicting the PMV value by adopting an indoor environment dynamic heat-humidity model;
the control rule setting module is used for setting control rules for the operation of the cooling system by taking the lowest energy consumption of the floor radiation and ventilation combined cooling system as an objective function and taking the indoor comfort index PMV threshold range as a constraint condition;
and the cooling system control module is used for determining the opening time of the ventilation system and the floor radiation system, and controlling the indoor thermal comfort index PMV by adjusting the sensible heat load bearing proportion of the ventilation system and the floor radiation system according to the interval where the PMV value is located.
As a possible implementation manner of this embodiment, the PMV value prediction module is specifically configured to predict the dry-bulb temperature by using an indoor environment dynamic heat-humidity modelt a Relative humidity ofRHAverage radiation temperaturet r In combination with a determined air flow ratev a Thermal resistance of clothesI cl Intensity of movement of personMCalculating a PMV value;
the indoor environment dynamic thermal-humidity model comprises an indoor environment dynamic thermal model and an indoor environment dynamic humidity model;
the indoor environment dynamic thermal model is as follows:
Figure 938249DEST_PATH_IMAGE006
in the method, in the process of the invention,C i the heat capacity of the air node, J/K;T i the temperature of the air node, K;Q surf,i gain, W, of radiation and convection heat for the surface of the enclosure;Q env,i w is the heat transferred to the air nodes through the wall;Q inf,i to penetrate the air-induced thermal gain, W;Q int,i for indoor convection and radiant heat gain (produced by personnel, equipment, lighting, etc.), W;Q solar,i for solar radiant heat gain through the window, W;Q r,i the cooling capacity W is provided for the floor radiation system to the air nodes;Q v,i the cooling capacity W is provided for the ventilation system to the air nodes;
the indoor environment dynamic wet model is as follows:
Figure 538994DEST_PATH_IMAGE007
in the method, in the process of the invention,M eff,i the effective moisture capacity of the air node, g/g;ω i the moisture content of the air node is g;W inf,i g, moisture gain due to permeated air;W int,i gain g for indoor moisture;W env g, the moisture transmitted to the air nodes through the wall body; W v,i g, the moisture removed for the ventilation system;
before the working start time of personnel, the gain of indoor heat and moisture is approximately zero, and the outdoor heat and moisture transfer is less, so that only the residual heat and moisture quantity to be removed are considered, and substituted into the formula to solve; in the working time period of personnel, the indoor heat source schedule determines that the outdoor weather is smaller than the indoor heat source, and the outdoor weather parameter changes less in 10 minutes in the acquisition interval, so that the outdoor weather parameter value acquired at present is adopted to substitute the formula for solving.
As a possible implementation manner of this embodiment, the objective optimization function is:
Figure 799074DEST_PATH_IMAGE008
Figure 392736DEST_PATH_IMAGE009
in the method, in the process of the invention,E pump the energy consumption of the circulating water pump is kWh;ρ sw to water supply density of kg/m 3 ；gGravitational acceleration, m/s 2 ；HThe lift of the circulating water pump is m;V sw for supplying water volume flow, m 3 /h；η pump The efficiency of the circulating water pump is;E fan the energy consumption of the fan is kWh;DPis the pressure drop of the fan, pa;ρ a to supply air density of kg/m 3 ；V sa For volume flow of air supply, m 3 /s；η fan The efficiency of the fan is the same; T out is the outdoor air temperature, °c;T set is the setpoint temperature, °c;T out,dew is the outdoor air dew point temperature, °c; d (D)h v J/kg for evaporation enthalpy;ω out g/kg, the moisture content of the outdoor air;ω max is the maximum moisture content set value, g/kg.
The constraint conditions are as follows: starting a precooling process through a floor radiation and ventilation combined cooling system, and requiring a PMV value to fall within a PMV threshold range at the working start time of personnel; the PMV values required to be calculated every 10 minutes during the personnel working period fall within the PMV threshold range.
The technical scheme of the embodiment of the invention has the following beneficial effects:
according to the invention, the sensible heat load bearing proportion of the ventilation system and the floor radiation system is adjusted, the specific gravity of the cooling capacity of the ventilation system/the floor radiation system is increased, the directivity requirement is additionally provided for the adjustment of the cooling capacity of the two systems, the regulation efficiency and accuracy of the floor radiation and ventilation composite cooling system are improved, and the problems of lower energy efficiency and poor control effect of the composite cooling system caused by the traditional control method are solved.
The invention aims at the lowest energy consumption of the floor radiation and ventilation combined cooling system and takes the indoor comfort index PMV as a constraint condition of [ -0.5, 0.5]. The control method takes PMV as a judging parameter and takes the sensible heat load bearing proportion Sv/SR of the ventilation system and the floor radiation system as a regulating parameter. Before the working starting time of the personnel, the PMV is not required to be controlled to be within the range of minus 0.5 and 0.5, so that the Sv/SR is adjusted according to the interval where the PMV value corresponding to the predicted working starting time of the personnel is positioned, the PMV threshold requirement can be met, and the energy consumption is saved; the Sv/SR is adjusted according to the predicted interval of the PMV value after 10 minutes from the current moment in the working time period of the personnel, so that the system can respond to indoor thermal gain change in time, and the problem of response hysteresis of the floor radiation system is effectively solved. The regulation of the Sv/SR method can clearly determine the specific gravity change of the cooling capacity of the two systems, strengthen the cooperative cooling effect of the two systems, enable the cooling capacity supply to be matched with the demand, and efficiently treat the indoor heat and humidity load. On the premise of ensuring indoor comfort, the invention improves the control precision and the system energy efficiency of the floor radiation and ventilation combined cooling system.
Drawings
FIG. 1 is a flow chart illustrating a PMV-based buried pipe direct supply floor radiant cooling control method according to an exemplary embodiment;
FIG. 2 is a block diagram of a PMV-based buried pipe direct supply floor radiant cooling control apparatus according to an exemplary embodiment;
FIG. 3 is a schematic diagram of a floor radiant and ventilation composite cooling system, according to an exemplary embodiment;
FIG. 4 is a flow chart illustrating a PMV index-based buried pipe direct supply floor radiant cooling control strategy according to an exemplary embodiment.
In FIG. 3, 1-air supply port, 2-cold radiation coil, 3-air return port, 4-underground heat exchanger, 5-buried pipe loop circulating water pump, 6-fan, 7-surface air cooler, 8-air handling unit, and 9-fresh air inlet.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
in order to clearly illustrate the technical features of the present solution, the present invention will be described in detail below with reference to the following detailed description and the accompanying drawings. The following disclosure provides many different embodiments, or examples, for implementing different structures of the invention. In order to simplify the present disclosure, components and arrangements of specific examples are described below. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. It should be noted that the components illustrated in the figures are not necessarily drawn to scale. Descriptions of well-known components and processing techniques and processes are omitted so as to not unnecessarily obscure the present invention.
The research on the load bearing proportion of the floor radiation system and the ventilation system is limited to describing the load bearing proportion change in the cooling process or providing a specific load bearing proportion range for improving the energy efficiency of the system, and the control mode of adjusting the load bearing proportion of the two systems according to the range of the PMV is lacking.
As shown in fig. 1, the method for controlling radiation and cooling of a buried pipe direct supply floor based on PMV provided by the embodiment of the invention includes the following steps:
collecting indoor environment parameters, setting the thermal resistance of clothes and the activity intensity of personnel as constant values and calculating PMV values; the indoor environmental parameters include floor surface temperature, dry bulb temperature, relative humidity, air flow rate, and average radiant temperature;
adopting an indoor environment dynamic heat-humidity model to predict a PMV value;
setting control rules for the operation of the cooling system by taking the lowest energy consumption of the floor radiation and ventilation combined cooling system as an objective function and taking the indoor comfort index PMV threshold range as a constraint condition;
and determining the opening time of the ventilation system and the floor radiation system, and controlling the indoor thermal comfort index PMV by adjusting the sensible heat load bearing proportion of the ventilation system and the floor radiation system according to the interval where the PMV value is located.
As a possible implementation of this embodiment, the PMV threshold range is [ -0.5, 0.5].
As a possible implementation manner of this embodiment, the PMV value is calculated as:
Figure 421872DEST_PATH_IMAGE001
Figure 459098DEST_PATH_IMAGE002
Figure 940895DEST_PATH_IMAGE003
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Figure 88979DEST_PATH_IMAGE004
Figure 723354DEST_PATH_IMAGE005
in the method, in the process of the invention,t a is the dry bulb temperature, °c;RHin order to be of a relative humidity level,%；v a air flow rate, m/s;t r is the average radiation temperature, °c;I cl is the thermal resistance of the clothes, clo;Mintensity of human activity, W; w is the mechanical work done by the human body, and is zero and J when sitting still;P a the water vapor partial pressure of the air around the human body is Pa;f cl is the dressing area coefficient;t cl is the garment exterior surface temperature, °c;h c w/(m) is the convective heat transfer coefficient 2 ∙K)。
As a possible implementation manner of this embodiment, the predicting the PMV value by using the indoor environment dynamic heat-humidity model includes:
predicting dry bulb temperature using indoor environment dynamic heat-humidity modelt a Relative humidity ofRHAverage radiation temperaturet r In combination with a determined air flow ratev a Thermal resistance of clothesI cl Intensity of movement of personMCalculating a PMV value;
the indoor environment dynamic heat and humidity model is as follows:
Figure 931481DEST_PATH_IMAGE006
in the method, in the process of the invention,C i the heat capacity of the air node, J/K;T i the temperature of the air node, K;Q surf,i gain, W, of radiation and convection heat for the surface of the enclosure;Q env,i w is the heat transferred to the air nodes through the wall;Q inf,i to penetrate the air-induced thermal gain, W;Q int,i for indoor convection and radiant heat gain (produced by personnel, equipment, lighting, etc.), W;Q solar,i for solar radiant heat gain through the window, W;Q r,i the cooling capacity W is provided for the floor radiation system to the air nodes;Q v,i the cooling capacity W is provided for the ventilation system to the air nodes;
Figure 900575DEST_PATH_IMAGE007
in the method, in the process of the invention,M eff,i the effective moisture capacity of the air node, g/g;ω i the moisture content of the air node is g;W inf,i g, moisture gain due to permeated air;W int,i gain g for indoor moisture;W env g, the moisture transmitted to the air nodes through the wall body; W v,i g, the moisture removed for the ventilation system;
before the working start time of personnel, the gain of indoor heat and moisture is approximately zero, and the outdoor heat and moisture transfer is less, so that only the residual heat and moisture quantity to be removed are considered, and substituted into the formula to solve; in the working time period of personnel, the indoor heat source schedule determines that the outdoor weather is smaller than the indoor heat source, and the outdoor weather parameter changes less in 10 minutes in the acquisition interval, so that the outdoor weather parameter value acquired at present is adopted to substitute the formula for solving.
As a possible implementation manner of this embodiment, the objective optimization function is:
Figure 586771DEST_PATH_IMAGE008
Figure 590499DEST_PATH_IMAGE009
in the method, in the process of the invention,E pump the energy consumption of the circulating water pump is kWh;ρ sw to water supply density of kg/m 3 ；gGravitational acceleration, m/s 2 ；HThe lift of the circulating water pump is m;V sw for supplying water volume flow, m 3 /h；η pump The efficiency of the circulating water pump is;E fan the energy consumption of the fan is kWh;DPis the pressure drop of the fan, pa;ρ a to supply air density of kg/m 3 ；V sa For volume flow of air supply, m 3 /s；η fan The efficiency of the fan is the same; T out is the outdoor air temperature, °c;T set is the setpoint temperature, °c;T out,dew is the outdoor air dew point temperature, °c; d (D)h v J/kg for evaporation enthalpy;ω out g/kg, the moisture content of the outdoor air;ω max g/kg is set as the maximum moisture content;
the constraint conditions are as follows: starting a precooling process through a floor radiation and ventilation combined cooling system, and requiring a PMV value to fall within a PMV threshold range at the working start time of personnel; the PMV values required to be calculated every 10 minutes during the personnel working period fall within the PMV threshold range.
As a possible implementation manner of this embodiment, the determining the opening time of the ventilation system and the floor radiation system, and controlling the indoor thermal comfort index PMV by adjusting the sensible heat load bearing ratio of the ventilation system and the floor radiation system according to the interval where the PMV value is located, includes:
according to the humidity which needs to be removed indoors, the design air supply temperature and the design air supply quantity of the ventilation system, the required pre-dehumidification time of the ventilation system is calculated, and the opening time of the ventilation system is determined:
Figure 969528DEST_PATH_IMAGE010
in the method, in the process of the invention,tthe pre-dehumidification time, h, is needed by the ventilation system;V sa for volume flow of air supply, m 3 /h；WG, the moisture content to be removed in the room;d in g/kg, the moisture content of indoor air;d sa the air supply moisture content is g/kg.
When the floor surface temperature is higher than the dew point temperature, the floor radiation system is started;
before the working time of the personnel, the sensible heat load bearing proportion S of the ventilation system and the floor radiation system is adjusted according to the PMV value interval corresponding to the predicted working starting time of the personnel v /S R Determining optimal water supply flow, air supply temperature and air supply quantity which meet PMV threshold requirements and have the lowest energy consumption;
in the personnel working time period, according to the PMV value interval after 10 minutes predicted at the current moment, S is adjusted v /S R And determining the optimal air supply temperature and air supply quantity.
As a possible implementation manner of this embodiment, the working time period of the personnel is 9:00-17:00; the floor radiant system and ventilation system shut down time was 17:00.
As a possible implementation of the present embodiment, the sensible heat load bearing ratio S of the ventilation system to the floor radiation system is adjusted v /S R Expressed as:
Figure 698622DEST_PATH_IMAGE011
in the method, in the process of the invention,Q vent. for replacing sensible heat load born by the ventilation system, kW ∙ h;Q RFC sensible heat load borne by the floor radiation system is kW ∙ h;T in is the indoor air temperature, °c;T sa the temperature of the air supply is DEG C;Afor floor surface area, m 2 ；h t W/(m) is the total heat transfer coefficient 2 ∙K)；T op Is the operating temperature, °c;T f is the floor surface temperature, °c.
As a possible implementation manner of this embodiment, the determining the optimal air supply temperature and the air supply amount includes:
at the start of personnel work, the initial operating parameters of the ventilation system are set: designing air supply temperature and air supply quantity, and setting initial operation parameters of a floor radiation system;
if the surface temperature of the floor does not reach the design requirement, the floor radiation cooling system operates at the maximum allowable water supply flow and is maintained unchanged;
if the floor surface temperature reaches the design requirement, the floor radiation cooling system operates at the design water supply flow rate and is kept unchanged.
As shown in fig. 2, the embodiment of the invention provides a PMV-based buried pipe direct-supply floor radiation cooling control device, which includes:
the data acquisition processing module is used for acquiring indoor environment parameters, setting the thermal resistance of clothes and the activity intensity of personnel as constant values and calculating PMV values; the indoor environmental parameters include floor surface temperature, dry bulb temperature, relative humidity, air flow rate, and average radiant temperature;
the PMV value prediction module is used for predicting the PMV value by adopting an indoor environment dynamic heat-humidity model;
the control rule setting module is used for setting control rules for the operation of the cooling system by taking the lowest energy consumption of the floor radiation and ventilation combined cooling system as an objective function and taking the indoor comfort index PMV threshold range as a constraint condition;
and the cooling system control module is used for determining the opening time of the ventilation system and the floor radiation system, and controlling the indoor thermal comfort index PMV by adjusting the sensible heat load bearing proportion of the ventilation system and the floor radiation system according to the interval where the PMV value is located.
As a possible implementation manner of this embodiment, the PMV value prediction module is specifically configured to predict the dry-bulb temperature by using an indoor environment dynamic heat-humidity modelt a Relative humidity ofRHAverage radiation temperaturet r In combination with a determined air flow ratev a Thermal resistance of clothesI cl Intensity of movement of personMCalculating a PMV value;
the indoor environment dynamic thermal-humidity model comprises an indoor environment dynamic thermal model and an indoor environment dynamic humidity model;
the indoor environment dynamic thermal model is as follows:
Figure 188509DEST_PATH_IMAGE006
in the method, in the process of the invention,C i the heat capacity of the air node, J/K;T i the temperature of the air node, K;Q surf,i gain, W, of radiation and convection heat for the surface of the enclosure;Q env,i w is the heat transferred to the air nodes through the wall;Q inf,i to penetrate the air-induced thermal gain, W;Q int,i for indoor convection and radiant heat gain (produced by personnel, equipment, lighting, etc.), W;Q solar,i for solar radiant heat gain through the window, W;Q r,i the cooling capacity W is provided for the floor radiation system to the air nodes;Q v,i and providing cooling capacity W for the ventilation system to the air nodes.
The indoor environment dynamic wet model is as follows:
Figure 781164DEST_PATH_IMAGE007
in the method, in the process of the invention,M eff,i the effective moisture capacity of the air node, g/g;ω i the moisture content of the air node is g;W inf,i g, moisture gain due to permeated air;W int,i gain g for indoor moisture;W env g, the moisture transmitted to the air nodes through the wall body; W v,i g, the moisture removed by the ventilation system.
Before the working start time of personnel, the gain of indoor heat and moisture is approximately zero, and the outdoor heat and moisture transfer is less, so that only the residual heat and moisture quantity to be removed are considered, and substituted into the formula to solve; in the working time period of personnel, the indoor heat source schedule determines that the outdoor weather is smaller than the indoor heat source, and the outdoor weather parameter changes less in 10 minutes in the acquisition interval, so that the outdoor weather parameter value acquired at present is adopted to substitute the formula for solving.
As a possible implementation manner of this embodiment, the objective optimization function is:
Figure 331094DEST_PATH_IMAGE008
Figure 274780DEST_PATH_IMAGE009
in the method, in the process of the invention,E pump the energy consumption of the circulating water pump is kWh;ρ sw to water supply density of kg/m 3 ；gGravitational acceleration, m/s 2 ；HThe lift of the circulating water pump is m;V sw for supplying water volume flow, m 3 /h；η pump The efficiency of the circulating water pump is;E fan the energy consumption of the fan is kWh;DPis the pressure drop of the fan, pa;ρ a to supply air density of kg/m 3 ；V sa For volume flow of air supply, m 3 /s；η fan The efficiency of the fan is the same; T out is the outdoor air temperature, °c;T set is the setpoint temperature, °c;T out,dew is the outdoor air dew point temperature, °c; d (D)h v J/kg for evaporation enthalpy;ω out g/kg, the moisture content of the outdoor air;ω max is the maximum moisture content set value, g/kg.
The constraint conditions are as follows: starting a precooling process through a floor radiation and ventilation combined cooling system, and requiring a PMV value to fall within a PMV threshold range at the working start time of personnel; the PMV values required to be calculated every 10 minutes during the personnel working period fall within the PMV threshold range.
Referring to fig. 3 and 4, a specific process of the present invention for controlling radiation and cooling of a buried pipe direct supply floor based on PMV index will be described below with reference to specific cases.
(1) Collecting indoor environment parameters, setting the thermal resistance of clothes and the activity intensity of personnel as constant values and calculating PMV values; the indoor environmental parameters include floor surface temperature, dry bulb temperature, relative humidity, air flow rate, and average radiant temperature.
The specific process of the step (1) comprises the following steps:
the indoor environment parameters are collected at fixed time, including floor surface temperature and dry bulb temperaturet a Relative humidity ofRHAir flow ratev a Average radiation temperaturet r Air flow rate in generalv a The change is small, is approximately regarded as a constant value, and the thermal resistance of the clothes is setI cl Intensity of movement of personM0.5clo (summer) and 134W/person respectively, then automatically calculate PMV values:
Figure 319090DEST_PATH_IMAGE001
in the method, in the process of the invention,t a is the dry bulb temperature, °c;RHrelative humidity,%;v a air flow rate, m/s;t r is the average radiation temperature, °c;I cl is the thermal resistance of the clothes, clo;Mintensity of human activity, W; w is the mechanical work done by the human body, and is zero and J when sitting still;P a the water vapor partial pressure of the air around the human body is Pa;f cl is the dressing area coefficient;t cl is the garment exterior surface temperature, °c;h c w/(m) is the convective heat transfer coefficient 2 ∙K)。
Figure 31831DEST_PATH_IMAGE002
Figure 487083DEST_PATH_IMAGE003
Figure 918065DEST_PATH_IMAGE004
Figure 15334DEST_PATH_IMAGE005
(2) Adopting an indoor environment dynamic heat-humidity model to predict a PMV value;
the specific process of the step (2) comprises the following steps:
according to the collected real-time indoor environment parameters, predicting the dry bulb temperature by utilizing an indoor environment dynamic heat and humidity modelt a Relative humidity ofRHAverage radiation temperaturet r In combination with a determined air flow ratev a Thermal resistance of clothesI cl Intensity of movement of personMCalculating a PMV value;
the indoor environment dynamic heat and humidity model is as follows:
Figure 97428DEST_PATH_IMAGE012
in the method, in the process of the invention,C i the heat capacity of the air node, J/K;T i the temperature of the air node, K;Q surf,i gain, W, of radiation and convection heat for the surface of the enclosure;Q env,i w is the heat transferred to the air nodes through the wall;Q inf,i to penetrate the air-induced thermal gain, W;Q int,i for indoor convection and radiant heat gain (produced by personnel, equipment, lighting, etc.), W;Q solar,i for solar radiant heat gain through the window, W;Q r,i the cooling capacity W is provided for the floor radiation system to the air nodes;Q v,i and providing cooling capacity W for the ventilation system to the air nodes.
Figure 723581DEST_PATH_IMAGE007
In the method, in the process of the invention,M eff,i the effective moisture capacity of the air node, g/g;ω i the moisture content of the air node is g;W inf,i g, moisture gain due to permeated air;W int,i gain g for indoor moisture;W env g, the moisture transmitted to the air nodes through the wall body; W v,i g, the moisture removed by the ventilation system.
Before the working start time of personnel, the gain of indoor heat and moisture is approximately zero, and the outdoor heat and moisture transfer is less, so that only the residual heat and moisture quantity to be removed are considered, and substituted into the formula to solve; in the working time period of personnel, the indoor heat source schedule determines that the outdoor weather is smaller than the indoor heat source, and the outdoor weather parameter changes less in 10 minutes in the acquisition interval, so that the outdoor weather parameter value acquired at present is adopted to substitute the formula for solving.
(3) The minimum energy consumption of the floor radiation and ventilation combined cooling system is taken as an objective function, and the threshold range of the indoor comfort index PMV is taken as a constraint condition of minus 0.5 and 0.5.
The specific process of the step (3) comprises the following steps:
(3-1) establishing a target optimization function as:
Figure 376280DEST_PATH_IMAGE013
Figure 277240DEST_PATH_IMAGE014
in the method, in the process of the invention,E pump the energy consumption of the circulating water pump is kWh;ρ sw to water supply density of kg/m 3 ；gGravitational acceleration, m/s 2 ；HThe lift of the circulating water pump is m;V sw for supplying water volume flow, m 3 /h；η pump The efficiency of the circulating water pump is;E fan the energy consumption of the fan is kWh;DPis the pressure drop of the fan, pa;ρ a to supply air density of kg/m 3 ；V sa For volume flow of air supply, m 3 /s；η fan The efficiency of the fan is the same; T out is the outdoor air temperature, °c;T set is the setpoint temperature, °c;T out,dew is the outdoor air dew point temperature, °c; d (D)h v J/kg for evaporation enthalpy;ω out g/kg, the moisture content of the outdoor air;ω max is the maximum moisture content set value, g/kg.
(3-2) setting constraint conditions as follows: the PMV is required to be less than or equal to-0.5 and less than or equal to 0.5 at the working starting time of personnel through the opening precooling process of the floor radiation and ventilation combined cooling system; the PMV values required to be calculated every 10 minutes during the personnel working period fall at-0.5, 0.5.
The working time period of the personnel is 9:00-17:00. The floor radiant system and ventilation system shut down times were fixed at 17:00.
(4) Determining the opening time of the ventilation system and the floor radiation system according to the amount of humidity to be removed indoors and the magnitude relation between the floor surface temperature and the dew point temperature, and adjusting the sensible heat load bearing proportion S of the ventilation system and the floor radiation system according to the interval where the PMV value is located v /S R And controlling an indoor thermal comfort index PMV.
The specific process of the step (4) comprises the following steps:
(4-1) calculating the required pre-dehumidification time of the ventilation system according to the indoor moisture amount required to be removed, the design air supply temperature and the design air supply quantity of the ventilation system, and determining the opening time of the ventilation system:
Figure 433414DEST_PATH_IMAGE010
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in the method, in the process of the invention,tthe pre-dehumidification time, h, is needed by the ventilation system;V sa for volume flow of air supply, m 3 /h；WG, the moisture content to be removed in the room;d in g/kg, the moisture content of indoor air;d sa the air supply moisture content is g/kg.
(4-2) when the floor surface temperature is higher than the dew point temperature, the floor radiation system is turned on.
(4-3) before the personnel working time, adjusting S according to the interval where the PMV value corresponding to the predicted personnel working start time is located v /S R And determining the optimal water supply flow, air supply temperature and air supply quantity which meet the PMV threshold requirement and have the lowest energy consumption. After 10 minutes of interval, collecting indoor parameters, predicting the indoor parameters corresponding to the working start time of personnel, and adjusting S according to the interval where the calculated PMV value is v /S R The optimal operating parameters are determined. If the working starting time PMV of personnel is less than or equal to 0.5, adjusting the water supply flow of the floor radiation system to be a design value, and adjusting the air supply quantity and the air supply temperature of the ventilation system to be the design value; if personnel work start time PMV>0.5 increase S v /S R Based on the objective function and the constraint condition, the water supply flow of the floor radiation system is adjusted to be maximum, and the ventilation system adjusts the air supply quantity and the air supply temperature based on the minimum adjustment amplitude to determine an optimal value.
S v /S R Can be expressed as:
Figure 512360DEST_PATH_IMAGE011
in the method, in the process of the invention,Q vent. for replacing sensible heat load born by the ventilation system, kW ∙ h;Q RFC sensible heat load borne by the floor radiation system is kW ∙ h;T in is the indoor air temperature, °c;T sa the temperature of the air supply is DEG C;Afor floor surface area, m 2 ；h t W/(m) is the total heat transfer coefficient 2 ∙K)；T op Is the operating temperature, °c;T f is the floor surface temperature, °c.
(4-4) during the personnel working period, adjusting S according to the interval in which the PMV value predicted at the present time after 10 minutes is located v /S R And determining the optimal air supply temperature and air supply quantity which meet the PMV threshold requirement and have the lowest energy consumption. After 10 minutes of interval, the indoor parameters are collected and the dry bulb temperature after 10 minutes is predictedt a Relative humidity ofRHAverage radiation temperaturet r In combination with a determined air flow ratev a Thermal resistance of clothesI cl Intensity of movement of personMAccording to the interval of the calculated PMV value, S is adjusted v /S R The optimal operating parameters are determined. If PMV is less than or equal to 0.5 after 10 minutes, the air supply quantity of the ventilation system is adjusted to be the minimum fresh air quantity, and the air supply temperature is adjusted to be a design value; if PMV after 10 minutes>0.5 increase S v /S R Based on the objective function and the constraint condition, the ventilation system adjusts the air supply quantity and the air supply temperature based on the minimum adjustment amplitude, and determines an optimal value.
At the start of personnel work, the initial operating parameters of the ventilation system are set: designing air supply temperature and air supply quantity, and setting initial operation parameters of a floor radiation system: if the surface temperature of the floor does not reach the design requirement, the floor radiation cooling system operates at the maximum allowable water supply flow and is maintained unchanged; if the surface temperature of the floor reaches the design requirement, the floor radiation cooling system operates at the designed water supply flow rate and is kept unchanged.
Finally, it should be noted that: the above embodiments are only for illustrating the technical aspects of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the invention without departing from the spirit and scope of the invention, which is intended to be covered by the claims.

Claims (6)

1. The PMV-based buried pipe direct-supply floor radiation and cooling control method is characterized by comprising the following steps of:
collecting indoor environment parameters, setting the thermal resistance of clothes and the activity intensity of personnel as constant values and calculating PMV values; the indoor environmental parameters include floor surface temperature, dry bulb temperature, relative humidity, air flow rate, and average radiant temperature;
adopting an indoor environment dynamic heat-humidity model to predict a PMV value;
setting control rules for the operation of the cooling system by taking the lowest energy consumption of the floor radiation and ventilation combined cooling system as an objective function and taking the indoor comfort index PMV threshold range as a constraint condition;
determining the opening time of the ventilation system and the floor radiation system, and controlling the indoor thermal comfort index PMV by adjusting the sensible heat load bearing proportion of the ventilation system and the floor radiation system according to the interval where the PMV value is located;
the method for predicting the PMV value by adopting the indoor environment dynamic heat-humidity model comprises the following steps:
predicting dry bulb temperature using indoor environment dynamic heat-humidity modelt a Relative humidity ofRHAverage radiation temperaturet r In combination with a determined air flow ratev a Thermal resistance of clothesI cl Intensity of movement of personMCalculating a PMV value;
the indoor environment dynamic heat and humidity model is as follows:
Figure QLYQS_1
in the method, in the process of the invention,C i the heat capacity of the air node;T i is the air node temperature;Q surf,i gain radiation and convection heat for the surface of the enclosure;Q env,i is the heat transferred to the air nodes through the wall;Q inf,i thermal gain for permeated air;Q int,i gain for indoor convection and radiant heat;Q solar,i gain for solar radiant heat through the window;Q r,i providing cooling capacity to the air nodes for the floor radiant system;Q v,i lifting air nodes for ventilation systemsCooling capacity;
Figure QLYQS_2
in the method, in the process of the invention,M eff,i the effective moisture capacity is the air node;ω i moisture content for air nodes;W inf,i moisture gain for permeated air;W int,i gain for indoor moisture;W env is the amount of moisture transferred to the air node through the wall;W v,i moisture removed for the ventilation system;
before the working start time of personnel, the gain of indoor heat and moisture is approximately zero, and the outdoor heat and moisture transfer is less, so that only the residual heat and moisture quantity to be removed are considered, and substituted into the formula to solve; in the working time period of personnel, the indoor heat source schedule determines that the outdoor weather has smaller influence on the indoor heat environment compared with the indoor heat source, and the outdoor weather parameter changes less in 10 minutes in the acquisition interval, so that the outdoor weather parameter value acquired at present is adopted and substituted into the formula to solve;
the objective optimization function is as follows:
Figure QLYQS_3
Figure QLYQS_4
in the method, in the process of the invention,E pump the energy consumption of the circulating water pump is realized;ρ sw is the water supply density;ggravitational acceleration;His the lift of the circulating water pump;V sw for supplying water volume flow;η pump the efficiency of the circulating water pump is;E fan the energy consumption of the fan is as follows;DPis the pressure drop of the fan;ρ a the air supply density is;V sa the volume flow of the air supply is;η fan the efficiency of the fan is the same;T out is the outdoor air temperature;T set is the set point temperature;T out,dew is the outdoor air dew point temperature; d (D)h v J/kg for evaporation enthalpy;ω out is the moisture content of the outdoor air;ω max is the maximum moisture content set value;
the constraint conditions are as follows: starting a precooling process through a floor radiation and ventilation combined cooling system, and requiring a PMV value to fall within a PMV threshold range at the working start time of personnel; the PMV values required to be calculated every 10 minutes during the personnel working period fall within the PMV threshold range.
2. The method for controlling radiation and cooling of a buried pipe direct supply floor based on PMV according to claim 1, wherein the determining the opening time of the ventilation system and the floor radiation system and controlling the indoor thermal comfort index PMV by adjusting the sensible heat load bearing ratio of the ventilation system and the floor radiation system according to the interval where the PMV value is located comprises:
according to the humidity which needs to be removed indoors, the design air supply temperature and the design air supply quantity of the ventilation system, the required pre-dehumidification time of the ventilation system is calculated, and the opening time of the ventilation system is determined:
Figure QLYQS_5
in the method, in the process of the invention,tpre-dehumidified time required for a ventilation system;V sa the volume flow of the air supply is;Wthe amount of moisture to be removed in the room;d in is the moisture content of indoor air;d sa the moisture content of the supplied air;
when the floor surface temperature is higher than the dew point temperature, the floor radiation system is started;
before the working time of the personnel, the sensible heat load bearing proportion S of the ventilation system and the floor radiation system is adjusted according to the PMV value interval corresponding to the predicted working starting time of the personnel v /S R Determining optimal water supply flow, air supply temperature and air supply which meet PMV threshold requirements and have lowest energy consumptionAir quantity;
in the personnel working time period, according to the PMV value interval after 10 minutes predicted at the current moment, S is adjusted v /S R And determining the optimal air supply temperature and air supply quantity.
3. The PMV-based buried pipe direct supply floor radiation and cooling control method according to claim 1, wherein the personnel working time period is 9:00 to 17:00; the floor radiant system and ventilation system shut down time was 17:00.
4. A PMV-based buried pipe direct floor radiant cooling control method according to claim 1, wherein a sensible heat load bearing ratio S of the ventilation system to the floor radiant system is adjusted v /S R Expressed as:
Figure QLYQS_6
in the method, in the process of the invention,Q vent. sensible heat load to be carried by the displacement ventilation system;Q RFC sensible heat load carried by the floor radiant system;T in is the indoor air temperature;T sa the temperature of the air supply is the air supply temperature;Ais the floor surface area;h t is the total heat transfer coefficient;T op is the operating temperature;T f is the floor surface temperature.
5. A PMV-based buried pipe direct floor radiant cooling control method according to any one of claims 1 to 4, wherein said determining an optimum supply air temperature and supply air quantity includes:
at the start of personnel work, the initial operating parameters of the ventilation system are set: designing air supply temperature and air supply quantity, and setting initial operation parameters of a floor radiation system;
if the surface temperature of the floor does not reach the design requirement, the floor radiation cooling system operates at the maximum allowable water supply flow and is maintained unchanged;
if the floor surface temperature reaches the design requirement, the floor radiation cooling system operates at the design water supply flow rate and is kept unchanged.
6. A PMV-based buried pipe direct-supply floor radiation and cooling control device, comprising:
the data acquisition processing module is used for acquiring indoor environment parameters, setting the thermal resistance of clothes and the activity intensity of personnel as constant values and calculating PMV values; the indoor environmental parameters include floor surface temperature, dry bulb temperature, relative humidity, air flow rate, and average radiant temperature;
the PMV value prediction module is used for predicting the PMV value by adopting an indoor environment dynamic heat-humidity model;
the control rule setting module is used for setting control rules for the operation of the cooling system by taking the lowest energy consumption of the floor radiation and ventilation combined cooling system as an objective function and taking the indoor comfort index PMV threshold range as a constraint condition;
the cooling system control module is used for determining the opening time of the ventilation system and the floor radiation system and controlling indoor thermal comfort index PMV by adjusting the sensible heat load bearing proportion of the ventilation system and the floor radiation system according to the interval where the PMV value is located;
the PMV value prediction module is particularly used for predicting the dry bulb temperature by utilizing an indoor environment dynamic heat-humidity modelt a Relative humidity ofRHAverage radiation temperaturet r In combination with a determined air flow ratev a Thermal resistance of clothesI cl Intensity of movement of personMCalculating a PMV value;
the indoor environment dynamic thermal-humidity model comprises an indoor environment dynamic thermal model and an indoor environment dynamic humidity model;
the indoor environment dynamic thermal model is as follows:
Figure QLYQS_7
in the method, in the process of the invention,C i as air nodesA heat capacity;T i is the air node temperature;Q surf,i gain radiation and convection heat for the surface of the enclosure;Q env,i is the heat transferred to the air nodes through the wall;Q inf,i to penetrate the air-induced thermal gain, W;Q int,i gain for indoor convection and radiant heat;Q solar,i gain for solar radiant heat through the window;Q r,i providing cooling capacity to the air nodes for the floor radiant system;Q v,i providing cooling capacity for the ventilation system to the air nodes;
the indoor environment dynamic wet model is as follows:
Figure QLYQS_8
in the method, in the process of the invention,M eff,i the effective moisture capacity is the air node;ω i moisture content for air nodes;W inf,i moisture gain for permeated air;W int,i gain for indoor moisture;W env is the amount of moisture transferred to the air node through the wall;W v,i moisture removed for the ventilation system;
before the working start time of personnel, the gain of indoor heat and moisture is approximately zero, and the outdoor heat and moisture transfer is less, so that only the residual heat and moisture quantity to be removed are considered, and substituted into the formula to solve; in the working time period of personnel, the indoor heat source schedule determines that the outdoor weather has smaller influence on the indoor heat environment compared with the indoor heat source, and the outdoor weather parameter changes less in 10 minutes in the acquisition interval, so that the outdoor weather parameter value acquired at present is adopted and substituted into the formula to solve;
the objective optimization function is as follows:
Figure QLYQS_9
Figure QLYQS_10
in the method, in the process of the invention,E pump the energy consumption of the circulating water pump is realized;ρ sw is the water supply density;ggravitational acceleration;His the lift of the circulating water pump;V sw for supplying water volume flow;η pump the efficiency of the circulating water pump is;E fan the energy consumption of the fan is as follows;DPis the pressure drop of the fan;ρ a the air supply density is;V sa the volume flow of the air supply is;η fan the efficiency of the fan is the same;T out is the outdoor air temperature;T set is the set point temperature;T out,dew is the outdoor air dew point temperature; d (D)h v Is the evaporation enthalpy;ω out is the moisture content of the outdoor air;ω max is the maximum moisture content set value;
the constraint conditions are as follows: starting a precooling process through a floor radiation and ventilation combined cooling system, and requiring a PMV value to fall within a PMV threshold range at the working start time of personnel; the PMV values required to be calculated every 10 minutes during the personnel working period fall within the PMV threshold range.
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