CN117094105B - Method for calculating house air conditioner load of underground station equipment affected by osmotic wind - Google Patents
Method for calculating house air conditioner load of underground station equipment affected by osmotic wind Download PDFInfo
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- 238000004378 air conditioning Methods 0.000 claims abstract description 30
- 238000004364 calculation method Methods 0.000 claims description 18
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- 230000017525 heat dissipation Effects 0.000 claims description 11
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- 238000011156 evaluation Methods 0.000 claims 1
- 230000000149 penetrating effect Effects 0.000 abstract description 9
- 238000010276 construction Methods 0.000 abstract description 4
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 238000009423 ventilation Methods 0.000 description 10
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Abstract
The invention discloses a house air conditioner load calculating method for underground station equipment affected by osmotic wind. The method comprises the following steps: collecting information such as equipment number, equipment type and equipment nameplate power of equipment rooms, and analyzing and calculating the total heat productivity of the equipment; collecting equipment room position information, determining room air tightness parameters, and determining the influence of osmotic wind according to the equipment room position and the room air tightness to form an osmotic wind load model Q(s); acquiring a heat and humidity parameter of the enclosure and an indoor and outdoor design parameter of an equipment room to form a room enclosure heat transfer load model Q (w); and evaluating the load value of the air conditioner of the room according to the total heat productivity of the equipment, the osmotic wind load model and the heat transfer load model of the enclosure structure, and completing the design of the air conditioning system. According to the invention, the influence of the penetrating wind of the underground station is considered, and the design proposal of the room air conditioner for the equipment is formed aiming at the room characteristics of different equipment, so that the construction cost and the energy consumption of the room air conditioner system for the equipment management are saved.
Description
Technical Field
The invention relates to the field of air conditioner load calculation, in particular to a house air conditioner load calculation method for underground station equipment affected by osmotic wind.
Background
The air conditioning load of the urban rail transit station equipment management room is complex, and the corresponding equipment cooling load is difficult to determine. At present, designers have not fully known the load characteristics of the air conditioner of the rail transit, and the heating of electrical equipment is widely considered to be a single important source for the air conditioner load of a typical equipment management room. The current method for cooling small system air conditioner load of electric equipment in subway station is to utilize the existing engineering information to estimate according to the electric capacity, number and room area of the equipment or directly calculate according to the average value of engineering experience. The two design methods are generally more conservative compared with the actual load, so that the air conditioning load of the domestic rail transit equipment management house is generally larger. The design of the air conditioner load is larger, so that the size of a pipeline for designing the air conditioner is larger, the capacity of equipment is larger, and the construction cost and the design difficulty of an air conditioning system and civil engineering are increased; on the other hand, because the capacity of the equipment is higher than the actual air conditioning load, the indoor design parameters of the equipment room are lower than the design values, and the energy consumption and the running cost of the system are increased.
The air conditioner load for the subway station equipment has complex structure, and the calculation and determination method is difficult to be clear. From the load source angle analysis, subway station equipment room air conditioner load mainly comprises three aspects: firstly, the heat productivity of equipment operation, secondly, the heat transfer capacity of a room enclosure structure, and thirdly, the influence of the penetration air quantity of a room. Under the existing design method, only the influence of the permeated wind is considered when the large subway system is designed, and the equipment room always ignores the load of the permeated wind. According to different positions of the equipment room (a platform, a station hall and the shielding door or not), the penetrating wind load of part of the room is quite prominent, and the penetrating wind is a main source of the wet load of the equipment room, so that the part of the load needs to be brought into the design process of the air conditioner load of the equipment room, and the design load is ensured to be accurate.
Disclosure of Invention
Therefore, it is necessary to provide a method for calculating the load of the room air conditioner for the underground station equipment affected by the permeated wind, so as to solve the problem that the load calculation of the room air conditioner for the underground (subway) station equipment management is not accurate enough.
In order to achieve the above object, the present invention provides a method for calculating a load of a room air conditioner for an underground station equipment affected by penetrating wind, comprising the steps of:
collecting the number of equipment room equipment, equipment types and equipment nameplate power, and analyzing and calculating the total heat productivity of the equipment;
collecting equipment room position information, determining room air tightness parameters, and determining the influence of osmotic wind according to the equipment room position and the room air tightness to form an osmotic wind load model Q(s);
acquiring a heat and humidity parameter of the enclosure and an indoor and outdoor design parameter of an equipment room to form a room enclosure heat transfer load model Q (w);
and evaluating the load value of the air conditioner of the room according to the total heat productivity of the equipment, the osmotic wind load model Q(s) and the heat transfer load model Q (w) of the enclosure structure, and completing the design of the air conditioning system.
Further:
the total calorific capacity of computing equipment includes active power loss, the heat dissipation capacity of reactor and high-low pressure disk cabinet calorific capacity, specifically includes: the heat dissipation capacity of the underground station substation equipment is calculated and analyzed by a theoretical analysis and calculation method, and the calculation method is as follows:
electric energy loss of transformerLoss is called active power loss, the active power loss is totally converted into heat emitted into the air, and the transformer active power loss is as follows:in the formula deltaP S Is the active loss of the transformer; deltaP 0 Is the no-load loss of the transformer; deltaP K Short-circuit loss of the transformer;S C is the transformer computational load;S r is the rated load of the transformer;
heat dissipation capacity of the reactor:in the method, in the process of the invention,Pis the power loss of the reactor under rated power;η 1 is the utilization coefficient of the reactor,η 1 =0.95；η 2 is the load factor of the reactor and,η 2 =0.75；
high low pressure disk cabinet calorific capacity:in the method, in the process of the invention,I g is the working current of the high-voltage switch;I e is the rated current of the high-voltage switch;q e is the heat dissipation capacity at the rated current of the high-voltage switch.
Further:
the collection equipment room equipment quantity, equipment type and equipment nameplate power specifically include:
recording equipment types of equipment rooms, wherein the different equipment working characteristics are different, so that the heating characteristics are different;
recording equipment room nameplate powerP m For evaluating the overall heating value thereof;
and calculating the total heat productivity of the equipment aiming at different equipment types.
Further:
the equipment room position information specifically comprises:
recording a layer where a room of equipment is located, wherein the layer comprises a platform layer or a hall layer;
recording different positions of the platform layer equipment room, including shielding door shielding or shielding without shielding door shielding.
Further:
the osmotic wind load model Q(s) specifically comprises:
determining the indoor and outdoor pressure difference change characteristics according to the positions of equipment rooms, wherein the equipment rooms in similar positions have similar pressure difference change rules when trains enter and leave;
evaluating the permeation air quantity according to the pressure difference and the room air tightness parameters, splitting time, t 1 ~t 2 When the train enters the station, t 2 ~t 3 T is when the train is parked 3 ~t 4 When the train is out of the station, t 4 ~t 5 When no train is at the platform, the osmotic air quantity in different time periods and the whole period is evaluated to form an osmotic air law considering the frequency of entering and exiting the train;
determining the enthalpy value of the permeated air according to the type of the permeated air, and calculating the difference between the permeated air and the return air of the equipment room based on the enthalpy value of the outdoor track area when the permeated air is mainly or based on the enthalpy value of the public area when the permeated air is mainly;
and forming a permeated air load model Q(s) according to the difference between the permeated air quantity and the enthalpy value of the permeated air and the return air of the equipment room.
Further, the method further comprises the steps of:
sequentially evaluating the permeation air quantity of each time period and the whole period:wherein: />The air quantity of the permeated air in the nth time period; />The length of the opening seam is longer; />And->Fitting coefficients for the osmotic wind, which are related to the air tightness parameters, through room design parameters; />Is the pressure difference for the nth time period;
wherein: />Comprehensive penetration air quantity for equipment rooms;
the method comprises the steps of determining the ventilation air permeability enthalpy value according to the outdoor rail region enthalpy value, wherein the rail region enthalpy value is obtained according to a design value, actual measurement research under actual conditions can be carried out, and the heat-humidity load caused by ventilation air can be evaluated by the difference between the ventilation air permeability value and the room air enthalpy value;
forming a permeated air load model Q(s) according to the permeated air quantity and the difference between the permeated air and the enthalpy value of return air of the equipment room, wherein the model Q(s) is as follows:
wherein: />Is the density of the permeated air; />According to the air infiltration and exudation conditions, the total expression is air infiltration>The enthalpy value of the air in the outdoor track area is generally expressed as the air quantity exudation>Is the enthalpy value of the air in the public area; />The enthalpy value of the room air for the equipment. Further:
the envelope heat transfer load model Q (w) specifically includes:
reading corresponding design parameters to obtain the heat transfer characteristic of the enclosure structure;
acquiring indoor and outdoor heat and humidity parameters of an equipment room, wherein the outdoor heat and humidity parameters are designed by a large system with different equipment room positions or heat and humidity parameters of a track area, and the indoor heat and humidity parameters are obtained according to design standards;
forming the heat transfer load model Q (w) of the enclosure structure.
Further:
the room air conditioner load value specifically comprises:
and evaluating the equipment room air conditioning load according to the total heat productivity of the equipment room equipment, the room osmotic wind load model Q(s), the building envelope heat transfer load model Q (w) and the equipment room air conditioning load to form an equipment room air conditioning system design scheme considering the influence of osmotic wind.
Compared with the prior art, the technical scheme has the following advantages:
(1) The total heating value of the computing equipment is combined with the influence of the osmotic wind to calculate and obtain a room air conditioning load value, and the value is used as the design basis of an equipment room air conditioning system and is estimated not according to engineering experience, so that the heating value of the equipment and the capacity of the air conditioning system are better matched.
(2) Considering the influence of the penetrating wind of the underground equipment room (respectively considering the influence of the platform layer, the station hall layer and whether the shielding door exists or not), the unbalance of the air supply and return of the room is caused, and compared with the common load calculation method, the method is more accurate.
(3) And the air tightness characteristics and problems of the enclosure structure are analyzed, design schemes are given according to different air tightness characteristics, and room air tightness improvement suggestions can be given, so that the cost of the equipment room air conditioning system is saved in a room construction link.
Drawings
FIG. 1 is a flowchart illustrating steps performed in accordance with an embodiment of the present invention.
FIG. 2 is a second flowchart illustrating steps according to an embodiment of the present invention.
FIG. 3 is a diagram of a device load model according to an embodiment of the present invention.
FIG. 4 is a graph of a osmotic wind load model of an embodiment of the present invention.
FIG. 5 is a schematic diagram of a heat transfer load model of an enclosure in accordance with an embodiment of the invention.
FIG. 6 is a graph showing energy conservation and comparison of an air conditioner design load model taking into account the influence of ventilation according to an embodiment of the present invention.
Detailed Description
In order to describe the technical content, constructional features, achieved objects and effects of the technical solution in detail, the following description is made in connection with the specific embodiments in conjunction with the accompanying drawings.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of the phrase "in various places in the specification are not necessarily all referring to the same embodiment, nor are they particularly limited to independence or relevance from other embodiments. In principle, in the present application, as long as there is no technical contradiction or conflict, the technical features mentioned in the embodiments may be combined in any manner to form a corresponding implementable technical solution.
Unless defined otherwise, technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application pertains; the use of related terms herein is for the description of specific embodiments only and is not intended to limit the present application.
In the description of the present application, the term "and/or" is a representation for describing a logical relationship between objects, which means that there may be three relationships, e.g., a and/or B, representing: there are three cases, a, B, and both a and B. In addition, the character "/" herein generally indicates that the front-to-back associated object is an "or" logical relationship.
In this application, terms such as "first" and "second" are used merely to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual number, order, or sequence of such entities or operations.
Without further limitation, the use of the terms "comprising," "including," "having," or other like terms in this application is intended to cover a non-exclusive inclusion, such that a process, method, or article of manufacture that comprises a list of elements does not include additional elements but may include other elements not expressly listed or inherent to such process, method, or article of manufacture.
As in the understanding of the "examination guideline," the expressions "greater than", "less than", "exceeding", and the like are understood to exclude the present number in this application; the expressions "above", "below", "within" and the like are understood to include this number. Furthermore, in the description of the embodiments of the present application, the meaning of "a plurality of" is two or more (including two), and similarly, the expression "a plurality of" is also to be understood as such, for example, "a plurality of groups", "a plurality of" and the like, unless specifically defined otherwise.
In the description of the embodiments of the present application, spatially relative terms such as "center," "longitudinal," "transverse," "length," "width," "thickness," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counter-clockwise," "axial," "radial," "circumferential," etc., are used herein as terms of orientation or positional relationship based on the specific embodiments or figures, and are merely for convenience of description of the specific embodiments of the present application or ease of understanding of the reader, and do not indicate or imply that the devices or components referred to must have a particular position, a particular orientation, or be configured or operated in a particular orientation, and therefore are not to be construed as limiting of the embodiments of the present application.
Unless specifically stated or limited otherwise, in the description of the embodiments of the present application, the terms "mounted," "connected," "affixed," "disposed," and the like are to be construed broadly. For example, the "connection" may be a fixed connection, a detachable connection, or an integral arrangement; the device can be mechanically connected, electrically connected and communicated; it can be directly connected or indirectly connected through an intermediate medium; which may be a communication between two elements or an interaction between two elements. The specific meanings of the above terms in the embodiments of the present application can be understood by those skilled in the art to which the present application pertains according to the specific circumstances.
The invention provides a house air conditioner load calculating method for underground station equipment affected by osmotic wind, which can be operated on a calculating system, such as an air conditioner design system. The method comprises the following steps: collecting information such as equipment number, equipment type and equipment nameplate power of equipment rooms, and analyzing and calculating the total heat productivity of the equipment; collecting equipment room position information, determining room air tightness parameters, and determining the influence of osmotic wind according to the equipment room position and the room air tightness to form an osmotic wind load model Q(s); acquiring a heat and humidity parameter of the enclosure and an indoor and outdoor design parameter of an equipment room to form a room enclosure heat transfer load model Q (w); and evaluating the load value of the air conditioner of the room according to the total heat productivity of the equipment, the osmotic wind load model and the heat transfer load model of the enclosure structure, and completing the design of the air conditioning system.
Compared with the common equipment room, the subway equipment room is easily influenced by 'piston wind', is positioned in the equipment room which is positioned on a platform layer and is not shielded by a shielding door, has outstanding unbalanced phenomenon of air supply and return, and has great influence on the heat and humidity load by the ventilation. The equipment rooms with shielding doors shielding or at the hall floor are less affected by the permeated wind. Therefore, different air conditioner design schemes are selected according to different equipment room positions and different room air tightness parameters.
According to the invention, the total heating value of the computing equipment is combined with the influence of the osmotic wind to calculate and obtain the room air conditioning load value, and the value is used as the design basis of the equipment room air conditioning system, is estimated not according to engineering experience, and better matches the equipment heating and the air conditioning system capacity. Considering the influence of the penetrating wind of the underground equipment room (respectively considering the influence of the platform layer, the station hall layer and whether the shielding door exists or not), the unbalance of the air supply and return of the room is caused, and compared with the common load calculation method, the method is more accurate. And the air tightness characteristics and problems of the enclosure structure are analyzed, design schemes are given according to different air tightness characteristics, and room air tightness improvement suggestions can be given, so that the cost of the equipment room air conditioning system is saved in a room construction link.
As shown in fig. 1 and 2, embodiment 1 provides a method for calculating a load of a room air conditioner for an underground station equipment affected by penetrating wind, comprising the steps of:
s1: collecting information such as equipment number, equipment type and equipment nameplate power of equipment rooms, and analyzing and calculating the total heat productivity of the equipment;
the step S1 specifically includes:
s11: recording the number, type and electrical parameters (such as nameplate power) of each device in a device roomP m Etc.), the different equipment work-doing characteristics are different, and the resulting heating characteristics are different;
s12: and calculating the total heat productivity of the equipment according to different equipment types, and counting the total heat productivity of each equipment in the equipment room.
S2: collecting equipment room position information, determining room air tightness parameters, and determining the influence of osmotic wind according to the equipment room position and the room air tightness to form an osmotic wind load model Q(s);
the step S2 specifically includes:
s21: the indoor and outdoor pressure difference change characteristics of the equipment are determined according to the equipment room positions, the indoor and outdoor pressure difference change characteristics of rooms at similar positions of each station can be approximately considered to be identical, a room without pressure difference information can continuously monitor indoor and outdoor pressure by using a micro-manometer, and the pressure change characteristics of the rooms when a train enters and exits are focused;
s22: evaluating the permeation air quantity according to the pressure difference and the room air tightness parameter, wherein the air tightness parameter is obtained by room design parameters, and determining the periodicity of the permeation air of the room through acquired information of the entrance and exit of the train;
s23: determining the ventilation enthalpy value (taking the enthalpy value of an outdoor rail region), and calculating the difference between the ventilation enthalpy value and the enthalpy value of the air in the equipment room;
s24: and forming a permeated air load model Q(s) according to the permeated air quantity and the difference between the permeated air and the enthalpy value of the air in the equipment room.
S3: acquiring a heat and humidity parameter of the enclosure and an indoor and outdoor design parameter of an equipment room to form a room enclosure heat transfer load model Q (w);
the step S3 specifically includes:
s31: reading corresponding design parameters to obtain the heat transfer characteristic of the enclosure structure;
s32: acquiring indoor and outdoor heat and humidity parameters of an equipment room, wherein the outdoor heat and humidity parameters are designed by a large system with different equipment room positions or the heat and humidity parameters of a track area, and the indoor heat and humidity parameters are acquired according to the design parameters;
s33: forming the heat transfer load model Q (w) of the enclosure structure.
It should be noted that, steps S1, S2 and S3 have no determined sequence requirement, and are all preparation works of subsequent steps.
S4: forming an equipment room air conditioning system design scheme according to the total heat productivity of equipment room equipment, a room osmotic wind load model Q(s), an enclosure structure heat transfer load model Q (w);
the step S4 specifically includes:
the equipment room air conditioning load mainly comprises three parts, including equipment load, osmotic wind load and an enclosure structure load, the total heat productivity of equipment room equipment, a room osmotic wind load model Q(s) and an enclosure structure heat transfer load model Q (w) are counted to form an equipment room air conditioning load value, and an equipment room air conditioning system design scheme is formed according to load characteristics.
Fig. 3 to 5 are calculation processes of the equipment room air conditioner load calculation method. The equipment room load mainly comprises the total heat productivity of equipment, the heat transfer load of an enclosure structure and the osmotic wind load. Fig. 3 is a calculation method for calculating the total heat generation amount of a single device in a device room, and the data is a safer value for the heat generation of the device without considering the safety factor. Fig. 4 is a simulated calculated osmotic wind load, which only considers indoor total heat and sensible heat loads due to osmotic wind. FIG. 5 is a heat transfer load model of an enclosure showing the indoor cooling load caused by the enclosure. FIG. 6 is a graph of energy conservation comparison of an air conditioner design load model taking the influence of osmotic wind into consideration, wherein the heat transfer load of an enclosure structure taking the safety coefficient into consideration, the osmotic wind load and the total heat productivity of equipment are added to obtain the air conditioner design load of the method, and compared with an empirical design method and the design after air tightness is optimized, namely after the air tightness is improved, the air tightness parameters are influenced, so that the calculated air conditioner load value of the equipment room is reduced, and the air conditioner design load is reduced.
Further, the device type and nameplate power calculate the total heat productivity, specifically including: recording equipment types of equipment rooms, wherein the different equipment working characteristics are different, so that the heating characteristics are different; recording equipment room nameplate powerP m For evaluating the overall heating value thereof. Thereby realizing the calculation of the heating value according to the type of the equipment.
Further, the total heating value of the computing device specifically includes: the heat dissipation capacity of the underground station substation equipment is calculated and analyzed by a theoretical analysis and calculation method, and the calculation method is as follows:
the loss of electrical energy from the transformer is referred to as active power loss, which is all converted to heat that is dissipated into the air. Active power loss of transformer:in the formula deltaP S Is the active loss of the transformer; deltaP 0 Is the no-load loss of the transformer; deltaP K Short-circuit loss of the transformer;S C is the transformer computational load;S r is the rated load of the transformer.
Heat dissipation capacity of the reactor:in the method, in the process of the invention,Pis the power loss of the reactor under rated power;η 1 is the utilization coefficient of the reactor,η 1 =0.95；η 2 is the load factor of the reactor and,η 2 =0.75。
high low pressure disk cabinet calorific capacity：In the method, in the process of the invention,I g is the working current of the high-voltage switch;I e is the rated current of the high-voltage switch;q e is the heat dissipation capacity at the rated current of the high-voltage switch. Thus, the calculation of the heating value in three cases can be completed.
Further, the device room location information specifically includes: recording a layer where the equipment room is located, wherein the layer comprises a platform layer or a station hall layer, the platform layer is greatly influenced by subway piston wind, and the heat and humidity load of the equipment room is greatly influenced by penetrating wind; recording different positions of the platform layer equipment room, including shielding door shielding or shielding without shielding door shielding. Thus, the air tightness parameters of different rooms are determined, and the air tightness of different rooms is determined when the rooms are designed, so that the same room position can be determined to be the same air tightness parameters in a preset mode, and the different room positions are determined to be different. As with the four types described above (two layers combined with or without a shield door), four tightness parameters are possible.
Further, the osmotic wind load model Q(s) specifically includes: and the indoor and outdoor pressure difference change characteristics of the equipment are determined according to the equipment room position, part of rooms on the platform layer are not shielded by a shielding door, the influence of 'piston wind' of a subway is larger, the rooms shielded by the shielding door are influenced secondarily, and the influence of the 'piston wind' on the rooms on the platform layer is minimum. I.e. the values of the gas tightness parameters are different for different positions.
Estimating the permeation air quantity according to the pressure difference and the room air tightness parameter, t 1 ~t 2 When the train enters the station, t 2 ~t 3 T is when the train is parked 3 ~t 4 When the train is out of the station, t 4 ~t 5 When no train is at the platform, sequentially evaluating the permeation air quantity of each time period and the whole period:wherein: />For the nth timeThe air quantity of the penetrating air of the section is in unit of m 3 S; l is the length of the opening seam, m; k and c are osmotic wind fitting coefficients, are related to air tightness parameters and are fitted through room design parameters; p of (V) n The unit Pa is the pressure difference in the nth time period; />Wherein:L s the unit m is the comprehensive permeation air quantity of the equipment room 3 /s；
The method comprises the steps of determining the ventilation air permeability enthalpy value according to the outdoor rail region enthalpy value, wherein the rail region enthalpy value is obtained according to a design value, actual measurement research under actual conditions can be carried out, and the heat-humidity load caused by ventilation air can be evaluated by the difference between the ventilation air permeability value and the room air enthalpy value;
forming a permeated air load model Q(s) according to the permeated air quantity and the difference between the permeated air and the enthalpy value of return air of the equipment room, wherein the model Q(s) is as follows:wherein:ρ s in kg/m for air permeability 3 The method comprises the steps of carrying out a first treatment on the surface of the When the air quantity is permeated in the whole,h p when the enthalpy value of the air in the outdoor track area is expressed as the air quantity exudation,h p the enthalpy value of the air in the public area is given in kJ/kg;h 0 the enthalpy value of room air for equipment is given in kJ/kg;
further, the enclosure heat transfer load model Q (w) specifically includes: reading corresponding design parameters to obtain the heat transfer characteristic of the enclosure structure; acquiring indoor and outdoor heat and humidity parameters of an equipment room, wherein the outdoor heat and humidity parameters are designed by a large system with different equipment room positions or heat and humidity parameters of a track area, and the indoor heat and humidity parameters are obtained according to design standards; forming the heat transfer load model Q (w) of the enclosure structure. The calculation may be made with reference to an existing maintenance structure heat transfer load model.
Further, the room air conditioner load value specifically includes: and evaluating the equipment room air conditioning load according to the total heat productivity of the equipment room equipment, the room osmotic wind load model Q(s), the building envelope heat transfer load model Q (w) and the equipment room air conditioning load to form an equipment room air conditioning system design scheme considering the influence of osmotic wind. The equipment room air conditioner load value is the maximum load value obtained by the equipment total heating value, the room air permeability load model and the building envelope heat transfer load model, and the air conditioner design is carried out according to the room air conditioner load value, so that the problems of air conditioner waste and high cost caused by excessive redundancy are avoided. Specifically, when the method of the present invention is incorporated into an air conditioning design system, the air conditioning design system can automatically select the lowest air conditioner satisfying the load for each room according to the air conditioning load value of each room obtained by the present invention, thereby realizing automatic selection. And the rapid air conditioner design is realized.
It should be noted that, although the foregoing embodiments have been described herein, the scope of the present invention is not limited thereby. Therefore, based on the innovative concepts of the present invention, alterations and modifications to the embodiments described herein, or equivalent structures or equivalent flow transformations made by the present description and drawings, apply the above technical solution, directly or indirectly, to other relevant technical fields, all of which are included in the scope of the invention.
Claims (5)
1. A method for calculating the load of a house air conditioner for underground station equipment affected by osmotic wind is characterized by comprising the following steps:
collecting the number of equipment room equipment, equipment types and equipment nameplate power, and analyzing and calculating the total heat productivity of the equipment;
collecting equipment room position information, determining room air tightness parameters, and determining the influence of osmotic wind according to the equipment room position and the room air tightness to form an osmotic wind load model Q(s);
acquiring a thermal humidity parameter of the enclosure and an indoor and outdoor design parameter of an equipment room to form a heat transfer load model Q (w) of the enclosure;
evaluating a room air conditioner load value according to the total heat productivity of the equipment, the osmotic wind load model Q(s) and the enclosure structure heat transfer load model Q (w), and completing the design of an air conditioner system according to the evaluation;
the osmotic wind load model Q(s) specifically comprises:
determining the indoor and outdoor pressure difference change characteristics according to the positions of equipment rooms, wherein the equipment rooms in similar positions have similar pressure difference change rules when trains enter and leave;
evaluating the permeation air quantity according to the pressure difference and the room air tightness parameters, splitting time, t 1 ~t 2 For the period of train arrival, t 2 ~t 3 For train stopping period, t 3 ~t 4 For the train outbound time period, t 4 ~t 5 For a period of no train at a platform, evaluating the permeation air quantity of different periods and the whole period to form a permeation air law considering the frequency of train entering and exiting;
determining the enthalpy value of the permeated air according to the type of the permeated air, and calculating the difference between the permeated air and the return air of the equipment room based on the enthalpy value of the outdoor track area when the permeated air is mainly or based on the enthalpy value of the public area when the permeated air is mainly;
forming a permeated air load model Q(s) according to the difference between the permeated air quantity and the enthalpy value of the permeated air and the return air of the equipment room;
sequentially evaluating the permeation air quantity of each time period and the whole period:wherein: />The air quantity of the permeated air in the nth time period; />The length of the opening seam is longer; />And->Fitting coefficients for the osmotic wind, which are related to the air tightness parameters, through room design parameters; />Is the pressure difference for the nth time period; />Wherein: />Comprehensive penetration air quantity for equipment rooms;
determining an air permeability enthalpy value according to an outdoor rail region enthalpy value, wherein the rail region enthalpy value is obtained according to a design value, or performing actual measurement research under actual conditions, and evaluating the heat-humidity load caused by the air permeability by the difference between the air permeability value and the room air enthalpy value;
forming a permeated air load model Q(s) according to the permeated air quantity and the difference between the permeated air and the enthalpy value of return air of the equipment room, wherein the model Q(s) is as follows:wherein: />Is the density of the permeated air; />According to the air infiltration and exudation conditions, the total expression is air infiltration>The enthalpy value of the air in the outdoor track area is generally expressed as the air quantity exudation>Is the enthalpy value of the air in the public area; />A room air enthalpy value for the equipment; the envelope heat transfer load model Q (w) specifically includes:
reading corresponding design parameters to obtain the heat transfer characteristic of the enclosure structure;
acquiring indoor and outdoor heat and humidity parameters of an equipment room, wherein the outdoor heat and humidity parameters are designed by a large system with different equipment room positions or heat and humidity parameters of a track area, and the indoor heat and humidity parameters are obtained according to design standards;
forming the heat transfer load model Q (w) of the enclosure structure.
2. The method for calculating the load of the house air conditioner for the underground station facility affected by the osmotic wind according to claim 1, wherein:
the total calorific capacity of computing equipment includes active power loss, the heat dissipation capacity of reactor and high-low pressure disk cabinet calorific capacity, specifically includes: the heat dissipation capacity of the underground station substation equipment is calculated and analyzed by a theoretical analysis and calculation method, and the calculation method is as follows:
the electrical energy loss of the transformer is called active power loss, and the active power loss is totally converted into heat emitted into the air, and the active power loss of the transformer is as follows:in the formula deltaP S Is the active loss of the transformer; deltaP 0 Is the no-load loss of the transformer; deltaP K Short-circuit loss of the transformer;S C is the transformer computational load;S r is the rated load of the transformer;
heat dissipation capacity of the reactor:in the method, in the process of the invention,Pis the power loss of the reactor under rated power;η 1 is the utilization coefficient of the reactor,η 1 =0.95；η 2 is the load factor of the reactor and,η 2 =0.75；
high low pressure disk cabinet calorific capacity:in the method, in the process of the invention,I g is the working current of the high-voltage switch;I e is the rated current of the high-voltage switch;q e is the heat dissipation capacity at the rated current of the high-voltage switch.
3. The method for calculating the load of the house air conditioner for the underground station facility affected by the osmotic wind according to claim 1, wherein:
the collection equipment room equipment quantity, equipment type and equipment nameplate power specifically include:
recording a device room device type;
recording equipment room nameplate powerP m For evaluating the overall heating value thereof;
and calculating the total heat productivity of the equipment aiming at different equipment types.
4. The method for calculating the load of the house air conditioner for the underground station facility affected by the osmotic wind according to claim 1, wherein:
the equipment room position information specifically comprises:
recording a layer where a room of equipment is located, wherein the layer comprises a platform layer or a hall layer;
recording different positions of the platform layer equipment room, including shielding door shielding or shielding without shielding door shielding.
5. The method for calculating the load of the house air conditioner for the underground station facility affected by the osmotic wind according to claim 1, wherein:
the room air conditioner load value specifically comprises:
and according to the total heat productivity of the equipment, a permeated wind load model Q(s), an enclosure structure heat transfer load model Q (w), and an equipment room air conditioning load is evaluated to form an equipment room air conditioning system design scheme considering the influence of permeated wind.
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