CN116007133A - Fresh air conditioner anti-freezing control method and device and fresh air conditioner - Google Patents
Fresh air conditioner anti-freezing control method and device and fresh air conditioner Download PDFInfo
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- CN116007133A CN116007133A CN202211640788.3A CN202211640788A CN116007133A CN 116007133 A CN116007133 A CN 116007133A CN 202211640788 A CN202211640788 A CN 202211640788A CN 116007133 A CN116007133 A CN 116007133A
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- 238000007710 freezing Methods 0.000 title claims abstract description 91
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000010438 heat treatment Methods 0.000 claims abstract description 101
- 238000012544 monitoring process Methods 0.000 claims abstract description 12
- 238000004590 computer program Methods 0.000 claims description 6
- 238000009434 installation Methods 0.000 abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 23
- 230000002528 anti-freeze Effects 0.000 description 15
- 230000008014 freezing Effects 0.000 description 9
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 8
- 230000001276 controlling effect Effects 0.000 description 7
- 238000001816 cooling Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 7
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- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 4
- 230000002265 prevention Effects 0.000 description 4
- 238000005485 electric heating Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 108010053481 Antifreeze Proteins Proteins 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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- 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 an antifreezing control method and device for a fresh air conditioner and the fresh air conditioner. Wherein the method comprises the following steps: monitoring the tube temperature of the air heating coil during heating operation; switching a temperature control target according to the pipe temperature and the anti-freezing protection temperature threshold; according to the current temperature control target, adjusting the medium flow of the air heating coil to enable the measured temperature corresponding to the current temperature control target to reach the target temperature; the fresh air conditioner is not provided with a fresh air preheating device, and the target temperature is an anti-freezing protection temperature threshold or a user-set temperature. The invention does not need to arrange a fresh air preheating device, saves components, is convenient for engineering installation and reduces the cost; the coil anti-freezing control and the room temperature control of the fresh air conditioner are combined, the temperature control precision is improved on the basis of meeting the coil anti-freezing requirement, the room temperature comfort is guaranteed, and the problems that more devices are needed for the coil anti-freezing of the fresh air conditioner and the temperature control precision of the air conditioner is poor are solved.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an anti-freezing control method and device for a fresh air conditioner and the fresh air conditioner.
Background
The central air conditioner for ship uses a full air system of mixing primary return air with fresh air as main air, the central air treatment equipment is an indirect air conditioner, the air conditioner supplies hot air to a room after heating air by the air conditioner in winter, the heating coil in the air conditioner is a water-air heat exchange coil (which can be called an air heating coil or a hot water coil), and the common hot water supply temperature is 90 ℃, 60 ℃ and 45 ℃. The fresh air in the outside is lower than-18 ℃ in winter, the fresh air ratio of part of air conditioners is small, namely the temperature of the mixed fresh air and the mixed return air is more than 0 ℃, and the air conditioners can be not provided with anti-freezing control; when the temperature of the mixed air of part of the air conditioner is below 0 ℃, an anti-freezing thermosensitive switch needs to be arranged on the air side behind the hot water coil, and once the hot water coil is frozen (such as the temperature of the supplied hot water is too low or the flow of the supplied hot water is insufficient), emergency shutdown is needed, so that the coil is prevented from being frozen by low-temperature fresh air to cause frost crack failure damage of the heat exchange tube.
The central air conditioner for the ship is a full fresh air system, the fresh air temperature introduced by the air conditioner is even lower than-40 ℃, the hot water coil pipe of the air conditioner needs to automatically control the environment temperature to ensure the comfortable temperature of a room, and the antifreezing of the hot water coil pipe needs to be considered.
At present, the anti-freezing control of the fresh air conditioner comprises the following steps:
1) An antifreezing solution (such as high-concentration 60% glycol, and water solution at minus 40 ℃ is not frozen) is added into the circulating water system inside the hot water coil of the air conditioner. The glycol solution corrodes hot water coil pipe and hot water system pipeline accessories, water system corrosion-resistant material selection is needed to be replaced, the high-concentration glycol solution has lower heat conductivity coefficient than water, the heat exchanger area is required to be increased to promote heat supply, and the air conditioner and the water system are not required to be ordered to meet the negative influence caused by glycol solution, so that the cost is uneconomical.
2) The air conditioner is added with a fresh air preheater (such as an electric heating or high-temperature steam coil), fresh air is heated to more than 0 ℃ (when the fresh air is higher than 0 ℃, the fresh air preheating is closed) and then is sent to a hot water coil, and the air outlet temperature is controlled by finely regulating the water flow rate through a heat supply control valve (also called a heat supply electric proportional control valve) corresponding to the hot water coil, so that the temperature control target of the comfort of a room is met.
As shown in fig. 1, taking a fresh air conditioner as an example, the air conditioner includes: fresh air preheater 10, preheating control valve 11, fresh air temperature sensor 12, air heating coil 20, heat supply control valve 21, antifreeze switch 22 (mounted on the air side of the air heating coil), and air supply temperature sensor 30. The air heating coil 20 is used for heating air through a medium to realize heat supply, and the heat supply control valve 21 is used for controlling the medium flow of the air heating coil 20, and particularly controlling the heat medium flow entering the air heating coil 20. The air cooling coil 40 is used to cool air through a medium to effect cooling, and the cooling control valve 41 is used to control the flow of medium to the air cooling coil 40, specifically the flow of cold water into the air cooling coil 40.
The environment-control self-control configuration of the air conditioner comprises: an air heating coil 20, a heat supply control valve 21, and an air supply temperature sensor 30. The anti-freezing self-control configuration of the air conditioner comprises: fresh air preheater 10, preheating control valve 11 (for example heating steam solenoid valve or electric heating control relay), fresh air temperature sensor 12, antifreezing switch 22. The main control thought is as follows: the fresh air preheater 10 and the preheating control valve 11 are responsible for heating low-temperature fresh air to 0 ℃, monitoring the external fresh air temperature through the fresh air temperature sensor 12, starting the fresh air preheater 10 when the fresh air temperature is too low, and closing the fresh air preheater 10 when the external fresh air temperature is above 0 ℃; the anti-freezing switch 22 is responsible for air side temperature detection and action protection of the air heating coil 20, if the anti-freezing switch action (such as abnormal fault of the fresh air preheater or abnormal supply of the air heating coil heating medium) is triggered, the air conditioner is directly stopped (at the highest stage), the opening of the heat supply control valve 21 is increased to the maximum extent to supply the heating medium heating coil, the low-temperature fresh air is prevented from continuing to freeze the coil, and the normal start-up operation can be realized after the normal action of the anti-freezing switch is required to be checked and recovered. The air heating coil 20 and the heat supply control valve 21 are responsible for controlling and adjusting the air outlet temperature of the air conditioner to a user set temperature, for example, the value range of the user set temperature is 25-40 ℃.
The method can meet the requirements of the air conditioner on antifreezing function and temperature comfort, but has the following defects:
a. the antifreezing device is slightly more in configuration and not strong in fitting property. The fresh air preheater does not have installation conditions or installation spaces in all projects, the steam preheater needs to be provided with high-temperature steam in boiler places and a steam pipeline system is added, and the electric heating needs to increase the power distribution capacity of the system and air conditioning electric devices;
b. the room temperature control accuracy is poor. The air conditioner indirectly adjusts the room temperature by controlling the air outlet temperature, the air outlet temperature of the air conditioner cannot track the load change of the room, the phenomenon of overheat of the room temperature easily occurs, and a user is required to reset the temperature according to the comfort of the room temperature, so that the user experience is affected.
Aiming at the problems that in the prior art, the fresh air conditioner coil is more in devices required for freezing prevention and the temperature control precision of the air conditioner is poor, no effective solution is proposed at present.
Disclosure of Invention
The embodiment of the invention provides an anti-freezing control method and device for a fresh air conditioner and the fresh air conditioner, which at least solve the problems that in the prior art, more devices are needed for anti-freezing of a coil pipe of the fresh air conditioner, and the temperature control precision of the air conditioner is poor.
In order to solve the technical problems, the embodiment of the invention provides an anti-freezing control method for a fresh air conditioner, which comprises the following steps:
monitoring the tube temperature of the air heating coil during heating operation;
switching a temperature control target according to the pipe temperature and the anti-freezing protection temperature threshold;
according to the current temperature control target, adjusting the medium flow of the air heating coil to enable the measured temperature corresponding to the current temperature control target to reach the target temperature;
the fresh air conditioner is not provided with a fresh air preheating device, and the target temperature is an anti-freezing protection temperature threshold or a user-set temperature.
Optionally, switching the temperature control target according to the pipe temperature and the anti-freezing protection temperature threshold value includes:
comparing the pipe temperature with the anti-freezing protection temperature threshold value to determine a section where the pipe temperature is located;
and switching the temperature control target according to the determined interval.
Optionally, switching the temperature control target according to the determined interval includes:
if the pipe temperature is greater than or equal to the sum of the anti-freezing protection temperature threshold value and a preset value and lasts for a preset time, switching to a first temperature control target, wherein the measured temperature corresponding to the first temperature control target is room temperature, and the target temperature is a user-set temperature;
if the tube temperature is less than or equal to the anti-freezing protection temperature threshold value and the preset time is continued, switching to a second temperature control target, wherein the measured temperature corresponding to the second temperature control target is the tube temperature of the air heating coil, and the target temperature is the anti-freezing protection temperature threshold value;
if the tube Wen Dayu has the freeze protection temperature threshold value less than the sum of the freeze protection temperature threshold value and a preset value for a preset time, the last determined temperature control target is maintained unchanged.
Optionally, the air heating coil is connected with a medium inflow pipeline, and a heat supply control valve is arranged on the medium inflow pipeline;
adjusting the medium flow of the air heating coil according to the current temperature control target, comprising:
when the measured temperature is greater than the target temperature, reducing the opening of the heat supply control valve;
and when the measured temperature is smaller than the target temperature, increasing the opening degree of the heat supply control valve.
Optionally, the preset value ranges from 0.5 ℃ to 5 ℃.
Optionally, the range of the anti-freezing protection temperature threshold is 3 ℃ to 45 ℃, and meanwhile, the anti-freezing protection temperature threshold is larger than or equal to a user set temperature of-7 ℃ and smaller than or equal to a user set temperature of +15 ℃.
Optionally, the air heating coil includes: the device comprises a medium inlet, a medium outlet and a medium flow path communicated with the medium inlet and the medium outlet, wherein a temperature sensing bag is arranged on the medium flow path and close to the medium outlet, and the temperature sensing bag is used for collecting the lowest medium temperature of the air heating coil and is used as the tube temperature.
The embodiment of the invention also provides an antifreezing control device for the fresh air conditioner, which comprises the following components:
the monitoring module is used for monitoring the tube temperature of the air heating coil in the heating operation;
the switching module is used for switching the temperature control target according to the pipe temperature and the anti-freezing protection temperature threshold value;
the control module is used for adjusting the medium flow of the air heating coil according to the current temperature control target so as to enable the measured temperature corresponding to the current temperature control target to reach the target temperature;
the fresh air conditioner is not provided with a fresh air preheating device, and the target temperature is an anti-freezing protection temperature threshold or a user-set temperature.
The embodiment of the invention also provides a fresh air conditioner, which comprises: the embodiment of the invention discloses an antifreezing control device for a fresh air conditioner.
The embodiments of the present invention also provide a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the method of the embodiments of the present invention.
By applying the technical scheme of the invention, the fresh air conditioner does not need to be provided with a fresh air preheating device, namely a fresh air preheater, a preheating control valve and an antifreezing switch, so that components are simplified and saved, the installation space of the fresh air preheater and the automatic control accessories is saved, the engineering installation is facilitated, the applicability of the air conditioner is improved, and the cost is reduced; the temperature control target is automatically switched according to the temperature threshold value of the air heating coil during heating operation, and the medium flow of the air heating coil is adjusted according to the current temperature control target, so that the actual measured temperature corresponding to the current temperature control target reaches the target temperature, the target temperature is the temperature threshold value of the antifreeze protection or the set temperature of a user, the coil antifreeze control and the room temperature control of the fresh air conditioner are combined, the air heating coil automatically prevents freezing and automatically tracks the room temperature change, the temperature control precision is improved on the basis of meeting the coil antifreeze, the room temperature comfort is ensured, and the problems that more devices are needed for the coil antifreeze of the fresh air conditioner and the temperature control precision of the air conditioner is poor are solved.
Drawings
FIG. 1 is a schematic diagram of a conventional anti-freeze control of a full fresh air central air conditioning system of the prior art;
fig. 2 is a flowchart of an anti-freezing control method for a fresh air conditioner provided by an embodiment of the invention;
FIG. 3 is a schematic diagram of an anti-freezing control of a fresh air conditioner according to an embodiment of the present invention;
fig. 4 is a schematic diagram of antifreeze control of a hybrid air conditioner according to an embodiment of the present invention;
FIG. 5 is a control flow chart of reliable antifreezing and automatic environmental control of the fresh air conditioner provided by the embodiment of the invention;
FIG. 6 is a schematic diagram of a PID control concept provided by an embodiment of the invention;
FIG. 7A is a left side view of an air heating coil provided in an embodiment of the present invention;
FIG. 7B is a front view of an air heating coil provided in an embodiment of the present invention;
FIG. 7C is a right side view of an air heating coil provided in an embodiment of the present invention;
fig. 8 is a block diagram of an antifreezing control device for a fresh air conditioner according to an embodiment of the present invention;
reference numerals illustrate:
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that the terms "first," "second," and the like in the description and the claims and drawings of the present invention are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It should be noted that the steps illustrated in the flowcharts of the figures may be performed in a computer system such as a set of computer executable instructions, and that although a logical order is illustrated in the flowcharts, in some cases the steps illustrated or described may be performed in an order other than that illustrated herein.
Alternative embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
The embodiment of the invention provides an antifreezing control method for a fresh air conditioner, which can be applied to a full fresh air conditioner and also can be applied to a mixed air type air conditioner (namely an air conditioner with primary return air and fresh air mixed).
Fig. 2 is a flowchart of an anti-freezing control method for a fresh air conditioner according to an embodiment of the present invention, as shown in fig. 2, the method includes the following steps:
s201, monitoring the tube temperature of the air heating coil in the heating operation.
S202, switching the temperature control target according to the pipe temperature and the anti-freezing protection temperature threshold.
S203, according to the current temperature control target, adjusting the medium flow of the air heating coil to enable the measured temperature corresponding to the current temperature control target to reach the target temperature; the fresh air conditioner is not provided with a fresh air preheating device, and the target temperature is an anti-freezing protection temperature threshold or a user-set temperature.
The anti-freezing protection temperature threshold is the lower limit value of the anti-freezing protection temperature of the coil, and whether the air heating coil has frost crack risk can be judged through the anti-freezing protection temperature threshold.
The temperature control target includes: the measured temperature and the corresponding target temperature are the measured value of the temperature parameter to be controlled, and the target temperature is the target value of the temperature parameter to be controlled. For example, the measured temperature is a room temperature, and the target temperature is a user-set temperature; the measured temperature is the tube temperature of the air heating coil, and the target temperature is the anti-freezing protection temperature threshold.
The air heating coil heats air through the heating medium, and the pipe temperature of the air heating coil can be changed by adjusting the flow of the heating medium of the air heating coil, so that the coil is prevented from freezing, and the air outlet temperature of the air conditioner can be changed, thereby regulating and controlling the room temperature.
The fresh air conditioner of the embodiment does not need to be provided with a fresh air preheating device, namely a fresh air preheater, a preheating control valve and an antifreezing switch, so that components are simplified and saved, the installation space of the fresh air preheater and the automatic control accessories is saved, the engineering installation is facilitated, the applicability of the air conditioner is improved, and the cost is reduced; the temperature control target is automatically switched according to the temperature threshold value of the air heating coil during heating operation, and the medium flow of the air heating coil is adjusted according to the current temperature control target, so that the actual measured temperature corresponding to the current temperature control target reaches the target temperature, the target temperature is the temperature threshold value of the antifreeze protection or the set temperature of a user, the coil antifreeze control and the room temperature control of the fresh air conditioner are combined, the air heating coil automatically prevents freezing and automatically tracks the room temperature change, the temperature control precision is improved on the basis of meeting the coil antifreeze, the room temperature comfort is ensured, and the problems that more devices are needed for the coil antifreeze of the fresh air conditioner and the temperature control precision of the air conditioner is poor are solved.
In one embodiment, switching the temperature control target according to the pipe temperature and the antifreeze protection temperature threshold value includes: comparing the tube temperature with an anti-freezing protection temperature threshold value to determine a section where the tube temperature is located; and switching the temperature control target according to the determined interval. In the embodiment, the temperature control target is switched by comparing the tube temperature with the anti-freezing protection temperature threshold value, so that the coil anti-freezing and temperature control are realized.
Further, according to the determined section, switching the temperature control target includes:
if the pipe temperature is greater than or equal to the sum of the anti-freezing protection temperature threshold value and the preset value and lasts for the preset time, switching to a first temperature control target, wherein the measured temperature corresponding to the first temperature control target is the room temperature, and the target temperature is the user set temperature;
if the tube temperature is less than or equal to the anti-freezing protection temperature threshold value and the preset time is continued, switching to a second temperature control target, wherein the measured temperature corresponding to the second temperature control target is the tube temperature of the air heating coil, and the target temperature is the anti-freezing protection temperature threshold value;
if the pipe temperature is larger than the anti-freezing protection temperature threshold value and smaller than the sum of the anti-freezing protection temperature threshold value and the preset value and lasts for the preset time, the temperature control target determined last time is kept unchanged.
The preset time can be set according to actual conditions, and the value range of the preset time can be 3-60 seconds. By setting the preset time, erroneous judgment can be avoided.
The preset value can be set by debugging according to different air conditioner scales and heat load characteristics, and the range of the preset value can be 0.5-5 ℃. The preset value is set to participate in the switching of the temperature control target, so that the reasonable temperature gradient between the air outlet temperature (close to the anti-freezing protection temperature threshold) of the air conditioner and the room temperature can be ensured when the air conditioner operates according to the second temperature control target. The room temperature control precision of the comfort air conditioner is about +/-2 ℃, if the temperature difference gradient is too small, the temperature control target is frequently switched to cause unstable temperature control, if the temperature difference gradient is too large, the transition interval is too large, the room temperature control is easy to lag, and on the basis of ensuring stable switching of the temperature control target as much as possible, the smaller the preset value is, the higher the temperature control precision is.
According to the embodiment, based on the intelligent switching temperature control target of the pipe temperature, the fresh air conditioner can not only guarantee that the pre-judging coil pipe is prevented from freezing in advance, but also prevent the protection from being stopped due to too small medium flow when the room is under low load, and can realize comfortable and accurate temperature control of the room directly according to the dynamic load change of the room temperature.
The air heating coil is connected with a medium inflow pipeline, and a heat supply control valve is arranged on the medium inflow pipeline. The opening degree of the heat supply control valve is controlled to adjust the medium flow rate of the air heating coil.
Specifically, according to the current temperature control target, adjust the medium flow of air heating coil, include: when the measured temperature is greater than the target temperature, reducing the opening of the heat supply control valve; and when the measured temperature is smaller than the target temperature, increasing the opening degree of the heat supply control valve. The opening degree adjustment of the heat supply control valve is performed by, for example, proportional Integral (PI) control or Proportional Integral Derivative (PID) control. According to the embodiment, the opening degree of the heat supply control valve can be quickly adjusted, so that the medium flow of the air heating coil can be adjusted.
The conventional heating medium is hot water or saturated high-temperature steam with the pressure of 0.3MPa, and the water medium is arranged in the coil after heating, so that the tube temperature of the air heating coil is required to be higher than the freezing point temperature of 0 ℃, and the threshold value of the anti-freezing protection temperature is higher than 0 ℃ in consideration of the safety margin. If the setting of the anti-freezing protection temperature threshold is too small, the anti-freezing action protection failure caused by too small opening of the heat supply control valve is easy to occur, and the room temperature control is uncomfortable caused by too low air supply temperature. If the anti-freezing protection temperature threshold is set too large, anti-freezing failure cannot be caused, but when the load of a room becomes small, the temperature of the air supply is too high, so that the temperature control of the room is uncomfortable.
In this embodiment, the value range of the anti-freezing protection temperature threshold may be 3 ℃ to 45 ℃, and at the same time, the anti-freezing protection temperature threshold is greater than or equal to the user-set temperature of-7 ℃ and less than or equal to the user-set temperature of +15℃. The user-set temperature is generally in the range of 10-30 ℃ when heating in winter. Therefore, the anti-freezing control and the room temperature control precision can be effectively considered.
As shown in fig. 3, compared with the existing fresh air conditioner provided with a primary fresh air preheater and a secondary air heating coil, the fresh air conditioner of this embodiment is provided with only a single-stage heating coil and an automatic control device (i.e. only an air heating coil is provided, without a fresh air preheater), and specifically includes: an air heating coil 20, a heat supply control valve 21, a bulb 26 (for mounting position see fig. 7A to 7C), a room temperature sensor 50.
The heat supply control valve 21 is used for adjusting the flow of the coil heating medium, so that the air heating coil 20 is controlled to run under non-antifreezing working conditions (namely, the tube temperature is larger than the antifreezing protection temperature threshold), the room temperature is controlled, and reliable antifreezing and automatic environmental control are realized.
The number N of the room temperature sensors 50 can be set according to the room area to collect the temperatures T of the areas of the room 21 、T 22 、…、T 2N Calculating to obtain room temperature T2=X 1 ×T 21 +X 2 ×T 22 +X 3 ×T 23 +X 4 ×T 24 +…+X N ×T 2N Wherein the weight coefficient X 1 +X 2 +X 3 +X 4 +…+X N ＝100％，X N The weight coefficient representing the Nth room temperature sensor, the specific weight coefficient can be set according to the conditions of different rooms, T 2N And the temperature value acquired by the Nth room temperature sensor is indicated, if one room temperature sensor fails, the temperature value acquired by the failure sensor is automatically discarded, and the calculation of the room temperature is not participated.
As shown in fig. 4, which is a schematic diagram of a hybrid air conditioner, in winter, the hybrid air conditioner heats the hybrid air by using an air heating coil 20, and provides the hybrid air to a room, the temperature of the hybrid air is higher than that of the external fresh air, the coil is not easy to freeze, and the requirements of freezing prevention and temperature control are more easily met.
As shown in fig. 5, a control flow chart of reliable antifreezing and automatic environmental control for a fresh air conditioner comprises the following steps:
s501, heating and starting up a fresh air conditioner.
S502, performing program initialization processing, specifically, fully opening a heat supply control valve to 100%, after a blower starts running, delaying for 30 seconds to start detecting the tube temperature T1 and the room temperature T2 of the air heating coil, and entering the judgment of the strategy one or the strategy two.
S503, determining whether 30 consecutive seconds satisfies interval one: t1 is greater than or equal to Th+DeltaT, if 507, S504 is entered if not. Th represents an antifreeze protection temperature threshold value, and Δt represents a preset value.
S504, determining whether 30 consecutive seconds satisfies interval three: t1 is equal to or less than Th, if yes, 508 is entered, if no, S505 is entered.
S505, determining that consecutive 30 seconds satisfies interval two: th < T1 < Th+ [ delta ] T, and proceed to S506.
S506, whether T1 satisfies the third section or the first section (namely, whether T1 operates in the third section in the last period is determined by taking 30 seconds as a period) is determined, if the third section is the third section, S508 is entered, and if the third section is the first section, S507 is entered.
S507, executing a heating control valve automatic PI regulation strategy I:
measured object t=room temperature T2;
control object T Is provided with =user set temperature;
controlling the load action: if T > T Is provided with Reducing the opening of the heat supply control valve, if T is less than T Is provided with The opening degree of the heat supply control valve is increased.
S508, executing a heating control valve automatic PI regulation strategy II:
measured object t=tube temperature T1 of the air heating coil;
control object T Is provided with =antifreeze protection temperature threshold Th;
controlling the load action: if T > T Is provided with Reducing the opening of the heat supply control valve, if T is less than T Is provided with The opening degree of the heat supply control valve is increased.
The opening degree adjustment of the heat supply control valve may be realized by PI control or PID control, specifically, automatic proportional integral control is performed according to the measured temperature (i.e., the measured target) and the target temperature (i.e., the control target), and, referring to fig. 6, t=t is caused by PID control Is provided with When t=t is satisfied Is provided with While continuing to maintain the pid control to maintain t=t Is provided with Is a state of (2).
The temperature control target of the heat supply control valve is automatically switched by dynamically monitoring the running temperature interval (interval one/interval two/interval three) of the pipe temperature of the air heating coil, so that the basic requirement of coil freezing prevention is met, and the room temperature comfort control is realized.
Referring to fig. 7A to 7C, the air heating coil 20 includes: a medium inlet 23, a medium outlet 24, and a medium flow path 25, the medium flow path 25 being for communicating the medium inlet 23 and the medium outlet 24. A bulb 26 may be provided on the medium flow path 25 to collect the tube temperature of the air heating coil 20, and a bulb 26 may be provided at a circular position as shown in fig. 7A, and the bulb 26 is mounted at the copper tube elbow 27 through a bulb insert 28. A represents a normally closed self-gravity water drain valve.
Preferably, a temperature sensing bulb 26 is disposed on the medium flow path 25 near the medium outlet 24, and the temperature sensing bulb 26 is used for collecting the minimum medium temperature of the air heating coil 20 as the tube temperature, so as to better realize the coil freezing prevention. For example, the bulb 26 is disposed at the wall temperature of the copper tube elbow of the copper tube copper fin air heating coil for collecting the lowest temperature representative of the heating medium on the air heating coil, and is typically disposed at the outlet elbow of the last flow path through which the heating medium of the coil flows.
Based on the same inventive concept, the embodiment of the invention also provides an anti-freezing control device for the fresh air conditioner, which can be used for realizing the anti-freezing control method for the fresh air conditioner. The fresh air conditioner anti-freezing control device can be realized through software and/or hardware, and can be generally integrated in a controller of the fresh air conditioner. The same or corresponding terms as those of the above embodiments are explained, and the present embodiment will not be repeated.
Fig. 8 is a block diagram of a fresh air conditioner anti-freezing control device according to an embodiment of the present invention, and as shown in fig. 8, the fresh air conditioner anti-freezing control device includes:
a monitoring module 81 for monitoring the tube temperature of the air heating coil during heating operation;
a switching module 82 for switching a temperature control target according to the pipe temperature and the anti-freezing protection temperature threshold;
the control module 83 is configured to adjust a medium flow of the air heating coil according to a current temperature control target, so that an actually measured temperature corresponding to the current temperature control target reaches a target temperature;
the fresh air conditioner is not provided with a fresh air preheating device, and the target temperature is an anti-freezing protection temperature threshold or a user-set temperature.
Optionally, the switching module 82 includes:
the comparison unit is used for comparing the pipe temperature with the anti-freezing protection temperature threshold value so as to determine the section where the pipe temperature is located;
and the switching unit is used for switching the temperature control target according to the determined interval.
Optionally, the switching unit is specifically configured to:
if the pipe temperature is greater than or equal to the sum of the anti-freezing protection temperature threshold value and a preset value and lasts for a preset time, switching to a first temperature control target, wherein the measured temperature corresponding to the first temperature control target is room temperature, and the target temperature is a user-set temperature;
if the tube temperature is less than or equal to the anti-freezing protection temperature threshold value and the preset time is continued, switching to a second temperature control target, wherein the measured temperature corresponding to the second temperature control target is the tube temperature of the air heating coil, and the target temperature is the anti-freezing protection temperature threshold value;
if the tube Wen Dayu has the freeze protection temperature threshold value less than the sum of the freeze protection temperature threshold value and a preset value for a preset time, the last determined temperature control target is maintained unchanged.
Optionally, the air heating coil is connected with a medium inflow pipeline, and a heat supply control valve is arranged on the medium inflow pipeline; the control module 83 is specifically configured to: when the measured temperature is greater than the target temperature, reducing the opening of the heat supply control valve; and when the measured temperature is smaller than the target temperature, increasing the opening degree of the heat supply control valve.
Optionally, the preset value ranges from 0.5 ℃ to 5 ℃.
Optionally, the range of the anti-freezing protection temperature threshold is 3 ℃ to 45 ℃, and meanwhile, the anti-freezing protection temperature threshold is larger than or equal to a user set temperature of-7 ℃ and smaller than or equal to a user set temperature of +15 ℃.
Optionally, the air heating coil includes: the device comprises a medium inlet, a medium outlet and a medium flow path communicated with the medium inlet and the medium outlet, wherein a temperature sensing bag is arranged on the medium flow path and close to the medium outlet, and the temperature sensing bag is used for collecting the lowest medium temperature of the air heating coil and is used as the tube temperature.
The fresh air conditioner anti-freezing control device can execute the fresh air conditioner anti-freezing control method provided by the embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method. Technical details which are not described in detail in the embodiment of the invention can be seen in the anti-freezing control method of the fresh air conditioner provided by the embodiment of the invention.
The embodiment of the invention also provides a fresh air conditioner, which comprises: the fresh air conditioner anti-freezing control device is described in the embodiment.
The embodiments of the present invention also provide a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the method described in the above embodiments.
The embodiment of the invention also provides a computer device, which comprises: a memory, a processor and a computer program stored on the memory and executable on the processor, which processor implements the steps of the method described in the above embodiments when it executes the computer program.
The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on this understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The anti-freezing control method for the fresh air conditioner is characterized by comprising the following steps of:
monitoring the tube temperature of the air heating coil during heating operation;
switching a temperature control target according to the pipe temperature and the anti-freezing protection temperature threshold;
according to the current temperature control target, adjusting the medium flow of the air heating coil to enable the measured temperature corresponding to the current temperature control target to reach the target temperature;
the fresh air conditioner is not provided with a fresh air preheating device, and the target temperature is an anti-freezing protection temperature threshold or a user-set temperature.
2. The method of claim 1, wherein switching the temperature control target according to the pipe temperature and the freeze protection temperature threshold comprises:
comparing the pipe temperature with the anti-freezing protection temperature threshold value to determine a section where the pipe temperature is located;
and switching the temperature control target according to the determined interval.
3. The method according to claim 2, wherein switching the temperature control target according to the determined interval comprises:
if the pipe temperature is greater than or equal to the sum of the anti-freezing protection temperature threshold value and a preset value and lasts for a preset time, switching to a first temperature control target, wherein the measured temperature corresponding to the first temperature control target is room temperature, and the target temperature is a user-set temperature;
if the tube temperature is less than or equal to the anti-freezing protection temperature threshold value and the preset time is continued, switching to a second temperature control target, wherein the measured temperature corresponding to the second temperature control target is the tube temperature of the air heating coil, and the target temperature is the anti-freezing protection temperature threshold value;
if the tube Wen Dayu has the freeze protection temperature threshold value less than the sum of the freeze protection temperature threshold value and a preset value for a preset time, the last determined temperature control target is maintained unchanged.
4. The method of claim 1, wherein the air heating coil is connected to a medium inflow line, the medium inflow line being provided with a heat supply control valve;
adjusting the medium flow of the air heating coil according to the current temperature control target, comprising:
when the measured temperature is greater than the target temperature, reducing the opening of the heat supply control valve;
and when the measured temperature is smaller than the target temperature, increasing the opening degree of the heat supply control valve.
5. A method according to claim 3, wherein the predetermined value is in the range of 0.5 ℃ to 5 ℃.
6. The method of any of claims 1 to 5, wherein the freeze protection temperature threshold ranges from 3 ℃ to 45 ℃ while the freeze protection temperature threshold is greater than or equal to a user set temperature of-7 ℃ and less than or equal to a user set temperature of +15 ℃.
7. The method of any one of claims 1 to 5, wherein the air heating coil comprises: the device comprises a medium inlet, a medium outlet and a medium flow path communicated with the medium inlet and the medium outlet, wherein a temperature sensing bag is arranged on the medium flow path and close to the medium outlet, and the temperature sensing bag is used for collecting the lowest medium temperature of the air heating coil and is used as the tube temperature.
8. An antifreezing control device for a fresh air conditioner is characterized by comprising:
the monitoring module is used for monitoring the tube temperature of the air heating coil in the heating operation;
the switching module is used for switching the temperature control target according to the pipe temperature and the anti-freezing protection temperature threshold value;
the control module is used for adjusting the medium flow of the air heating coil according to the current temperature control target so as to enable the measured temperature corresponding to the current temperature control target to reach the target temperature;
the fresh air conditioner is not provided with a fresh air preheating device, and the target temperature is an anti-freezing protection temperature threshold or a user-set temperature.
9. A fresh air conditioner, comprising: the fresh air conditioner anti-freezing control device of claim 8.
10. A non-transitory computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method according to any one of claims 1 to 7.
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| CN202211640788.3A CN116007133A (en) | 2022-12-20 | 2022-12-20 | Fresh air conditioner anti-freezing control method and device and fresh air conditioner |
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| CN202211640788.3A CN116007133A (en) | 2022-12-20 | 2022-12-20 | Fresh air conditioner anti-freezing control method and device and fresh air conditioner |
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