CN110220269A - A kind of antifreeze control method of fan coil, system and air-conditioning - Google Patents
A kind of antifreeze control method of fan coil, system and air-conditioning Download PDFInfo
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- CN110220269A CN110220269A CN201910474457.9A CN201910474457A CN110220269A CN 110220269 A CN110220269 A CN 110220269A CN 201910474457 A CN201910474457 A CN 201910474457A CN 110220269 A CN110220269 A CN 110220269A
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- water temperature
- temperature
- water
- threshold
- fan coil
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
- F24F11/43—Defrosting; Preventing freezing of indoor units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/85—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using variable-flow pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
Abstract
A kind of antifreeze control method of fan coil, system and air-conditioning, wherein antifreeze control method, comprising: temperature detection step: under off-mode, detecting environment temperature, when environment temperature is less than first threshold, detection blower fan coil pipe leaving water temperature and return water temperature；Judgment step: determine whether water temperature declines and decline degree according to the leaving water temperature and return water temperature；And rate-determining steps: whether decline and decline the unlatching and operating status of the judgement result control water pump of degree according to the water temperature.In low temperature, pass through detection blower fan coil pipe leaving water temperature and return water temperature, determine whether water temperature declines and decline degree, to according to whether decline and the unlatching and operating status of the corresponding control water pump of decline degree, when so that the water energy in fan coil heat exchange pipe enough flowing, water will not be frozen into ice, also just solve the problems, such as fan coil bursting by freezing, to extend the service life of fan coil, control method is rationally and effective.
Description
Technical field
The present invention relates to air-conditioning technical field, in particular to a kind of antifreeze control method of fan coil, system and
Air-conditioning.
Background technique
Fan coil is conventional use of end prod, and fan coil is flowed in heat exchanger using water as refrigerating medium,
Stability and comfort are higher, therefore apply on large-scale Refrigeration Engineering on a large scale.Winter temperature is lower, due to fan unit
Water inside the heat exchanger tube of the pipe constricted flow in the case where temperature is equal to or less than zero degree, thus part engineering in winter when do not use wind
Machine coil pipe corresponds to the water in fan coil at this time and remains in heat exchanger tube that there are following hidden danger: when environment temperature is lower than 0 DEG C,
Water can congeal into ice, and corresponding volume can expand at this time, and as the water inside heat exchanger tube gradually build-ups ice, volume is increasing, right
The pressure of heat exchanger tube is increasing, finally by the heat exchanger tube pressure break of fan coil, leads to fan coil appearance in normal use
A series of hidden danger such as leak, greatly reduce the service life of fan coil.
It is most of directly by will be in fan coil when environment temperature is lower in the existing antifreeze scheme of fan coil
Water discharge mode come eliminate freeze due to water cooling caused by heat exchanger tube lead to the hidden danger of spalling, and many times corresponding reality
Situation does not arrive the stage that must be drained, and after in addition directly being drained, weight is also needed when re-using in the later period
Newly filled the water, it is inconvenient, expend time and manpower.
Therefore, it needs to propose the problem of one kind can effectively solve bursting by freezing when fan coil is not used in winter, to improve wind
The scheme of the service life of machine coil pipe.
Summary of the invention
Problems solved by the invention is: since the bursting by freezing that water remaining may cause is asked when fan coil is not used in winter
Topic.
To solve the above problems, the present invention provides antifreeze control method, system and the air-conditioning of a kind of fan coil.
According to an aspect of the invention, there is provided a kind of antifreeze control method of fan coil, comprising: temperature detection step
It is rapid: under off-mode, detect environment temperature, when environment temperature be less than first threshold when, detection blower fan coil pipe leaving water temperature and return
Coolant-temperature gage；Judgment step: determine whether water temperature declines and decline degree according to the leaving water temperature and return water temperature；And control
Step processed: whether decline and decline the unlatching and operating status of the judgement result control water pump of degree according to the water temperature.
At low temperature (environment temperature is less than first threshold), by detection blower fan coil pipe leaving water temperature and return water temperature, sentence
Determine whether water temperature declines and decline degree, thus according to whether decline and the unlatching and fortune of the corresponding control water pump of decline degree
Row state, when so that the water energy in fan coil heat exchange pipe enough flowing, water will not be frozen into ice, also just solve fan coil
The problem of bursting by freezing, to extend the service life of fan coil, control method is rationally and effective.
Further, the antifreeze control method further include: circulate operation step: institute is recycled again after the preset time of interval
State temperature detection step, judgment step and rate-determining steps.
By the way that the circulate operation step is arranged, it can effectively monitor and once whether decline and decline according to water temperature preceding
How are the unlatching of the judgement result control water pump of degree and effect after operating status, and corresponding corresponding processing are persistently taken to arrange
It applies, can be realized real-time and lasting antifreeze control.
Further, in the judgment step, determine what whether water temperature declined according to the leaving water temperature and return water temperature
Method includes: to determine that water temperature does not decline when the leaving water temperature and return water temperature are all larger than second threshold；When the water temperature out
Degree is less than second threshold or the return water temperature is less than second threshold, determines water temperature drop；Wherein the second threshold is less than institute
First threshold is stated, and the first threshold and the temperature difference of the second threshold are 5 DEG C.
According to actual experiment result it is found that 5 DEG C lower than dry-bulb temperature of wet-bulb temperature or so in general environment temperature, therefore
The normal temperature difference of environment temperature and water temperature is 5 DEG C in fan coil, if 5 DEG C of temperature difference <, illustrate that water temperature is not declining, if temperature difference >
5 DEG C, illustrate that water temperature is declining.
Further, in the judgment step, water temperature drop degree is determined according to the leaving water temperature and return water temperature
Method includes: to be less than described the when the leaving water temperature is less than the second threshold and is greater than third threshold value or the return water temperature
Two threshold values and be greater than third threshold value, determine water temperature drop degree be heavy duty；When the leaving water temperature be less than the third threshold value and
The return water temperature is less than the third threshold value, determines that water temperature drop degree is high risk grade；Wherein the second threshold is greater than
The third threshold value.
In the rate-determining steps, whether decline and decline opening for the judgement result control water pump of degree according to the water temperature
Opening with the method for operating status includes: when determining that water temperature does not decline, and water pump is not turned on or closes from open state；When judgement water
When temperature decline, water pump is run at the first time after opening；When determining water temperature drop degree for heavy duty, water pump is persistently transported after opening
Turn；Continuous running and show that failure is reminded when determining water temperature drop degree for high risk grade, after water pump is opened, reminded contents
Are as follows: unit has bursting by freezing risk, powers off after please draining water.
In the present invention, not only determined whether water temperature declines, but also the decline degree of water temperature is set
Corresponding decision condition, so as to take different degrees of antifreeze control measure according to the different decline degree of water temperature correspondence,
Accurately anti-freeze operation is realized, in the case where water temperature has decline, only opens the flowing that water pump realizes water for a period of time,
In the case that water temperature drop is than more serious (corresponding heavy duty), continuous running after water pump is opened, until the leaving water temperature that detects and
Return water temperature no longer meets corresponding condition, such as sometime detects after continuous running after the unlatching of water pump after a period of time
To leaving water temperature and return water temperature be all larger than second threshold, then illustrate no longer water pump to be needed to be run, can close at this time
Water pump；When water temperature drop degree is high risk, depends water pump alone in such cases and promote the flowing of water may be local not enough
Water may make fan coil there are bursting by freezing risk already close to 0 degree, and not only water pump continuous running but also will be shown after unlatching
Show that failure is reminded.
Further, the circulate operation step includes: to grasp in a temperature detection step, judgment step and rate-determining steps
After completing, the temperature detection step, judgement are recycled according to the different preset time in the operational circumstances interval of this time again
Step and rate-determining steps: in the secondary judgment step and rate-determining steps, determining that water temperature does not decline, corresponding water pump be not turned on or from
Open state is spaced the first preset time after closing and recycles the temperature detection step, judgment step and rate-determining steps again,
First preset time is between 30~90min；In the secondary judgment step and rate-determining steps, water temperature drop, corresponding water are determined
Pump is run at the first time after opening, and recycles the temperature detection step, judgment step and control step at once after first time
Suddenly；In the secondary judgment step and rate-determining steps, determine that water temperature drop degree is heavy duty, continuous running after corresponding water pump is opened,
The temperature detection step, judgment step and rate-determining steps are recycled every the second preset time, second preset time is situated between
In 5~8min.
In the embodiment, interval time of temperature detection next time is carried out by corresponding last operating result
Setting can be spaced longer at this time when corresponding last temperature detection result shows that water temperature is higher, does not need water pump unlatching
Time carry out temperature detection and judgement next time；When corresponding last temperature detection result shows that water temperature has certain decline
Degree is judged at once after water pump operation (first time) for a period of time, to determine the result after last water pump unlatching
How, and the antifreeze control operation of corresponding progress again according to the judgment result；When corresponding last temperature detection result table
When bright water temperature drop degree is very serious, water pump is persistently opened, and (such as 5-8min) carries out temperature detection at regular intervals,
With the antifreeze control effect of real-time monitoring, until judging that water temperature is unsatisfactory for closing water pump after corresponding water pump continues unlocking condition；
Further, the first time is 5min.
The water pump opening time, 5min was to be preferably provided with, and in order to allow the water in pipe-line system sufficiently to flow, water pump is opened
Time cannot be too short or too long, if the time too short water that may cause in pipe-line system does not flow completely, if overlong time
It can cause unnecessary energy consumption.
Further, the first threshold is 18 DEG C, and the third threshold value is 5 DEG C.
According to " civil buildings heating ventilator and In Air Conditioning Design specification ", building interior Environment Design keeps warm temperature >=18
DEG C, if 18 DEG C of environment temperature >, building heat preservation is good, does not have freezing risk, therefore set first threshold as 18 DEG C, right
The second threshold answered is 13 DEG C, when leaving water temperature and return water temperature are all larger than 13 DEG C, illustrates water temperature downward trend at this time
It is small, the antifreezing measures of degree of correspondence need to be taken；Third threshold value is set as 5 DEG C, when leaving water temperature and return water temperature are respectively less than 5 DEG C
When, illustrate that water temperature is already below 5 DEG C at this time, since the temperature of water is in stratification state, when sensor detects total water
When temperature is 5 DEG C, for possible part water temperature close to 0 DEG C, there are higher freezing risks, need to take corresponding antifreezing measures.
According to another aspect of the present invention, a kind of antifreeze control system of fan coil is provided, comprising: temperature detection
Module, in the power-offstate, detecting environment temperature, when environment temperature is less than first threshold, the water outlet of detection blower fan coil pipe
Temperature and return water temperature；Judgment module, for according to the leaving water temperature and return water temperature determine water temperature whether decline and under
Drop degree；And control module, the judgement result for whether declining and declining degree according to the water temperature control water pump
Unlatching and operating status.
Antifreeze control system of the invention detects to obtain environment temperature, leaving water temperature and return water temperature by temperature detecting module
Degree determines whether water temperature declines and decline degree according to leaving water temperature and return water temperature using judgment module, to control mould
Block is according to whether decline and decline degree correspond to the unlatching and operating status of control water pump, so that in fan coil heat exchange pipe
When water energy enough flows, water will not be frozen into ice, also just solve the problems, such as fan coil bursting by freezing, to extend fan coil
Service life, control method rationally and effectively.
According to a further aspect of the invention, a kind of air-conditioning is provided, antifreeze control system of the invention or use are included
Antifreeze control method of the invention.
It include fan coil units, three temperature sensors, two of them temperature sensor difference in air-conditioning of the invention
It is mounted on the water inlet pipe and outlet pipe of fan coil, another is then mounted at the top of fan coil, for detecting environment temperature
Degree, which further includes the water pump and water tank that usual fan coil water route can use, by the detection to temperature sensor with
And judgement, the operation and unlatching of water pump are accurately controlled, when the water energy in fan coil heat exchange pipe enough flows, water will not
It is frozen into ice, also just solves the problems, such as fan coil bursting by freezing, to extend the service life of fan coil.
Detailed description of the invention
Fig. 1 is the antifreeze control method flow chart of the fan coil according to shown in one embodiment of the invention；
Fig. 2 is the structural schematic diagram of the air-conditioning according to shown in one embodiment of the invention；
Fig. 3 is that air-conditioning as shown in Figure 2 was embodied using each step of antifreeze control method as shown in Figure 1 is corresponding
Cheng Tu；
Fig. 4 is the antifreeze control system block diagram of the fan coil according to shown in one embodiment of the invention.
Description of symbols:
1- water pump；The first temperature sensor of 2-；
3- fan coil；4- second temperature sensor；
5- third temperature sensor；6- water tank.
Specific embodiment
To make the above purposes, features and advantages of the invention more obvious and understandable, with reference to the accompanying drawing to the present invention
Specific embodiment be described in detail.
First embodiment
In first exemplary embodiment of the invention, a kind of antifreeze control method of fan coil is provided.
Fig. 1 is the antifreeze control method flow chart of the fan coil according to shown in one embodiment of the invention.
Shown in referring to Fig.1, the antifreeze control method of fan coil of the invention, comprising:
Temperature detection step S11: under off-mode, detecting environment temperature, when environment temperature is less than first threshold, detection
Fan coil leaving water temperature and return water temperature；
In the present embodiment, the first threshold is 18 DEG C, according to " civil buildings heating ventilator and In Air Conditioning Design are advised
Model ", building interior Environment Design keeps warm temperature >=18 DEG C, if 18 DEG C of environment temperature >, building heat preservation is good, does not have freezing
Risk, therefore set first threshold as 18 DEG C.
Judgment step S12: determine whether water temperature declines and decline degree according to the leaving water temperature and return water temperature；
Further, in the judgment step, determine what whether water temperature declined according to the leaving water temperature and return water temperature
Method includes: to determine that water temperature does not decline when the leaving water temperature and return water temperature are all larger than second threshold；When the water temperature out
Degree is less than second threshold or the return water temperature is less than second threshold, determines water temperature drop；Wherein the second threshold is less than institute
First threshold is stated, and the first threshold and the temperature difference of the second threshold are 5 DEG C.
According to actual experiment result it is found that 5 DEG C lower than dry-bulb temperature of wet-bulb temperature or so in general environment temperature, therefore
The normal temperature difference of environment temperature and water temperature is 5 DEG C in fan coil, if 5 DEG C of temperature difference <, illustrate that water temperature is not declining, if temperature difference >
5 DEG C, illustrate that water temperature is declining.
Further, in the judgment step, water temperature drop degree is determined according to the leaving water temperature and return water temperature
Method includes: to be less than described the when the leaving water temperature is less than the second threshold and is greater than third threshold value or the return water temperature
Two threshold values and be greater than third threshold value, determine water temperature drop degree be heavy duty；When the leaving water temperature be less than the third threshold value and
The return water temperature is less than the third threshold value, determines that water temperature drop degree is high risk grade；Wherein the second threshold is greater than
The third threshold value.
In the present embodiment, the second threshold corresponds to 13 DEG C, and the third threshold value is 5 DEG C.
Since the temperature difference of the first threshold and the second threshold is 5 DEG C, first threshold is set as 18 DEG C, corresponding the
Two threshold values are 13 DEG C, when leaving water temperature and return water temperature are all larger than 13 DEG C, illustrate that water temperature downward trend at this time is small, need to adopt
Take the antifreezing measures of degree of correspondence；Third threshold value is set as 5 DEG C, when leaving water temperature and return water temperature are respectively less than 5 DEG C, illustrates this
Shi Shuiwen is already below 5 DEG C, since the temperature of water is in stratification state, when sensor detects that overall water temperature is 5 DEG C,
For possible part water temperature close to 0 DEG C, there are higher freezing risks, need to take corresponding antifreezing measures.
Rate-determining steps S13: whether decline and decline the unlatching of the judgement result control water pump of degree according to the water temperature
And operating status；
In the rate-determining steps, whether decline and decline opening for the judgement result control water pump of degree according to the water temperature
Opening with the method for operating status includes: when determining that water temperature does not decline, and water pump is not turned on or closes from open state；When judgement water
When temperature decline, water pump is run at the first time after opening；When determining water temperature drop degree for heavy duty, water pump is persistently transported after opening
Turn；Continuous running and show that failure is reminded when determining water temperature drop degree for high risk grade, after water pump is opened, reminded contents
Are as follows: unit has bursting by freezing risk, powers off after please draining water.
The present invention is not only determined whether water temperature declines, but also sets correspondence for the decline degree of water temperature
Decision condition, so as to according to the different decline degree of water temperature correspondence take different degrees of antifreeze control measure, realize
Accurately anti-freeze operation only opens the flowing that water pump for a period of time realizes water, in water temperature in the case where water temperature has decline
In the case where suppression ratio more serious (corresponding heavy duty), continuous running after water pump is opened, until the leaving water temperature and return water that detect
Temperature no longer meets corresponding condition, such as sometime detects after continuous running after the unlatching of water pump after a period of time
Leaving water temperature and return water temperature are all larger than second threshold, then illustrate no longer water pump to be needed to be run, can switch off the pump at this time；
When water temperature drop degree is high risk (corresponding high risk grade), depends water pump alone in such cases and promote the flowing of water may also not
Enough, local water may make fan coil there are bursting by freezing risk already close to 0 degree, not only water pump after unlatching continuous running and
And also to show that failure is reminded.
Circulate operation step S14: the temperature detection step, judgment step and control are recycled again after the preset time of interval
Step processed；
It should be noted that above-mentioned steps S11-S13 is just able to achieve for the antifreeze solution for controlling this basic technique problems
Certainly, the scheme comprising step S14 is that preferred embodiment can be supervised effectively by the way that the circulate operation step is arranged on this basis
It surveys after the unlatching and operating status of the preceding judgement result control water pump for once whether declining and declining degree according to water temperature
How is effect, and correspondence persistently takes corresponding treatment measures, can be realized real-time and lasting antifreeze control.
Further, the circulate operation step includes: to grasp in a temperature detection step, judgment step and rate-determining steps
After completing, the temperature detection step, judgement are recycled according to the different preset time in the operational circumstances interval of this time again
Step and rate-determining steps: in the secondary judgment step and rate-determining steps, determining that water temperature does not decline, corresponding water pump be not turned on or from
Open state is spaced the first preset time after closing and recycles the temperature detection step, judgment step and rate-determining steps again,
First preset time is between 30~90min；In the secondary judgment step and rate-determining steps, water temperature drop, corresponding water are determined
Pump is run at the first time after opening, and recycles the temperature detection step, judgment step and control step at once after first time
Suddenly；In the secondary judgment step and rate-determining steps, determine that water temperature drop degree is heavy duty, continuous running after corresponding water pump is opened,
The temperature detection step, judgment step and rate-determining steps are recycled every the second preset time, second preset time is situated between
In 5~8min.
In the embodiment, interval time of temperature detection next time is carried out by corresponding last operating result
Setting can be spaced longer at this time when corresponding last temperature detection result shows that water temperature is higher, does not need water pump unlatching
Time carry out temperature detection and judgement next time；When corresponding last temperature detection result shows that water temperature has certain decline
Degree is judged at once after water pump operation (first time) for a period of time, to determine the result after last water pump unlatching
How, and the antifreeze control operation of corresponding progress again according to the judgment result；When corresponding last temperature detection result table
When bright water temperature drop degree is very serious, water pump is persistently opened, and (such as 5-8min) carries out temperature detection at regular intervals,
With the antifreeze control effect of real-time monitoring, until judging that water temperature is unsatisfactory for closing water pump after corresponding water pump continues unlocking condition；
In conclusion the antifreeze control method of the present embodiment solves the problems, such as fan coil bursting by freezing, to extend wind
The service life of machine coil pipe, control method are rationally and effective.Avoid it is existing when temperature is lower as long as will be in fan coil
The unnecessary property of operation caused by the mode of water discharge, by low temperature according to fan coil leaving water temperature and return water temperature for
Corresponding measure is taken in the judgement of water temperature drop degree, must not less than ten thousand in the case where can solve water cooling jelly using water pump
The case where (corresponding high risk grade) will not bleed off water, save manpower and time cost, realize real-time and lasting antifreeze
Control.
Second embodiment
In second exemplary embodiment of the invention, a kind of air-conditioning is provided, using antifreeze controlling party of the invention
Method.
It include fan coil units, three temperature sensors, two of them temperature sensor difference in air-conditioning of the invention
It is mounted on the water inlet pipe and outlet pipe of fan coil, another is then mounted at the top of fan coil, for detecting environment temperature
Degree, which further includes the water pump and water tank that usual fan coil water route can use, by the detection to temperature sensor with
And judgement, the operation and unlatching of water pump are accurately controlled, when the water energy in fan coil heat exchange pipe enough flows, water will not
It is frozen into ice, also just solves the problems, such as fan coil bursting by freezing, to extend the service life of fan coil.
Fig. 2 is the structural schematic diagram of the air-conditioning according to shown in one embodiment of the invention.Fig. 2 introduces this with reference to the accompanying drawing
The air conditioner structure of embodiment.Referring to shown in Fig. 2, with the direction of arrow signal water flow in Fig. 2, in the present embodiment, which includes:
Water tank 6；Water pump 1, water return outlet are connected with the water outlet of water tank 6；Fan coil 3, the water outlet phase of water return outlet and water pump 1
Connection, water outlet are connected with the water return outlet of water tank 6；First temperature sensor 2, positioned at the water return outlet of fan coil units 3,
Return water temperature for detection blower fan coil pipe；Second temperature sensor 4 is used for detection blower fan disk positioned at the top of fan coil 3
The environment temperature of pipe；And third temperature sensor 5, positioned at the water outlet of fan coil units 3, for detection blower fan coil pipe
Leaving water temperature.
Introduce how the air-conditioning of the present embodiment uses the present invention referring to Fig. 2 and Fig. 3 with specific example
Antifreeze control method.
Referring to shown in Fig. 2 and Fig. 3, fan coil 3 is after receiving the booting requirement of user, and water pump 1 is operated, at this time
Since water pump 1 is operating, water does not do other controls the case where flow regime is not in freeze；Work as fan unit
Pipe 3 receive user shut down require after, water pump close, environment temperature is detected at this time, when detect second temperature sense
When temperature value T2 (environment temperature) >=18 DEG C of device 4, a is thened follow the steps；As the temperature value T2 for detecting second temperature sensor 4
At 18 DEG C of <, b is thened follow the steps；
Step a, other controls are not done.
Second temperature sensor temperature value T2 >=18 DEG C illustrate wind disk local environment temperature at 18 DEG C or more, according to " civilian
Building heating ventilation and In Air Conditioning Design specification ", building interior Environment Design keeps warm temperature >=18 DEG C, if environment temperature > 18
DEG C, then building heat preservation is good, does not have freezing risk, therefore corresponding such case does not need to do other controls；
Step b, 18 DEG C of T2 < when, to the first temperature sensor 2 and the corresponding return water temperature of third temperature sensor 5 and go out
Coolant-temperature gage is detected, if detecting the temperature value T1 (return water temperature) >=13 DEG C of the first temperature sensor, and third temperature passes
The temperature value T3 (leaving water temperature) >=13 DEG C of sensor executes step c；If detecting the temperature value T1 < 13 of the first temperature sensor
DEG C or third temperature sensor 13 DEG C of temperature value T3 <, execute step d；
Step c, T1 >=13 DEG C and T3 >=13 DEG C illustrate that water temperature downward trend at this time is small (wet in general environment temperature
5 DEG C lower than dry-bulb temperature of ball temperature or so, therefore the normal temperature difference of circumstance temperature and water temperature is 5 DEG C in fan coil, if temperature difference < 5
DEG C, illustrate that water temperature is not declining, if 5 DEG C of temperature difference >, illustrate that water temperature is declining), do not do other controls at this time；
After preset time such as t time (such as 30min≤t≤90min), again to the first temperature sensor and third
The corresponding return water temperature of temperature sensor and leaving water temperature are detected, if still detecting the temperature value T1 of the first temperature sensor
>=13 DEG C and third temperature sensor temperature value T3 >=13 DEG C then recycle and execute step c；If detecting the first temperature sensor
13 DEG C of temperature value T1 < or 13 DEG C of < of third temperature sensor temperature value T3, thens follow the steps d；
Step d, (water pump opening time 5min is to allow the water in pipe-line system sufficiently to flow to water pump unlatching operating 5min
Get up, if the water in time too short possible pipe-line system does not flow completely, if overlong time can cause unnecessary energy consumption)；
The first temperature sensor and the corresponding return water temperature of third temperature sensor and leaving water temperature are detected after 5min, if
When detecting temperature value T1 >=13 DEG C of the first temperature sensor and temperature value T3 >=13 DEG C of third temperature sensor, water pump is closed
It closes, executes step c；If detecting 5 DEG C of temperature value, 13 DEG C of the < T1 < of the first temperature sensor or the temperature of third temperature sensor
5 DEG C of 13 DEG C of < T3 < of angle value execute step e；If detecting the first temperature sensor temperature value T1≤5 DEG C and third temperature sensing
5 DEG C of < of device temperature value T3, execute step f；
Step e, water pump continuous running；
The first temperature sensor and the corresponding return water temperature of third temperature sensor and leaving water temperature are detected every 5min, if
When detecting temperature value T1 >=13 DEG C of the first temperature sensor and temperature value T3 >=13 DEG C of third temperature sensor, water pump is closed
It closes, executes step c；If detecting 5 DEG C of temperature value, 13 DEG C of the < T1 < of the first temperature sensor or the temperature of third temperature sensor
5 DEG C of 13 DEG C of < T3 < of angle value, repeat step e；If detecting temperature value T1≤5 DEG C of the first temperature sensor and third temperature
Temperature value T3≤5 DEG C of sensor are spent, step f is executed；
Step f, water pump continuous running, display failure are reminded, reminded contents are as follows: unit has bursting by freezing risk, please drains water
After power off.
When T1≤5 DEG C and T3≤5 DEG C, illustrate at this time water temperature already below 5 DEG C (coolant-temperature gage in stratification state,
When sensor detects that overall water temperature is 5 DEG C, possible part water temperature is close to 0 DEG C) there is freezing risk, therefore water pump is controlled at this time
Continuous running, display failure are reminded, reminded contents are as follows: unit has bursting by freezing risk, powers off after please draining water.
3rd embodiment
In third exemplary embodiment of the invention, a kind of antifreeze control system of fan coil is provided.
Fig. 4 is the antifreeze control system block diagram of the fan coil according to shown in one embodiment of the invention.
Referring to shown in Fig. 4, the antifreeze control system of the present embodiment includes: temperature detecting module, is used in the power-offstate,
Environment temperature is detected, when environment temperature is less than first threshold, detection blower fan coil pipe leaving water temperature and return water temperature；Judge mould
Block, for determining whether water temperature declines and decline degree according to the leaving water temperature and return water temperature；And control module, it uses
The unlatching and operating status of water pump are controlled in the judgement result for whether declining and declining degree according to the water temperature.
Antifreeze control system of the invention detects to obtain environment temperature, leaving water temperature and return water temperature by temperature detecting module
Degree determines whether water temperature declines and decline degree according to leaving water temperature and return water temperature using judgment module, to control mould
Block is according to whether decline and decline degree correspond to the unlatching and operating status of control water pump, so that in fan coil heat exchange pipe
When water energy enough flows, water will not be frozen into ice, also just solve the problems, such as fan coil bursting by freezing, to extend fan coil
Service life, control method rationally and effectively.
In conclusion the present invention provides a kind of antifreeze control method of fan coil, system and air-conditioning, by detecting wind
Machine coil pipe leaving water temperature and return water temperature, determine water temperature whether decline and decline degree, thus according to whether decline and under
The unlatching and operating status of the corresponding control water pump of drop degree, when so that the water energy in fan coil heat exchange pipe enough flowing, water
It will not be frozen into ice, also just solve the problems, such as fan coil bursting by freezing, to extend the service life of fan coil, control method
Rationally and effectively, avoid it is existing when temperature is lower as long as need not by operation caused by the mode of the water discharge in fan coil
The property wanted, by taking correspondence for the judgement of water temperature drop degree according to fan coil leaving water temperature and return water temperature at low temperature
Measure, in the case where can solve water cooling using water pump and freeze, the case where (corresponding high risk grade) will not unless it is absolutely necessary
Water is bled off, manpower and time cost are saved, realizes real-time and lasting antifreeze control.
Although present disclosure is as above, present invention is not limited to this.Anyone skilled in the art are not departing from this
It in the spirit and scope of invention, can make various changes or modifications, therefore protection scope of the present invention should be with claim institute
Subject to the range of restriction.
Claims (10)
1. a kind of antifreeze control method of fan coil characterized by comprising
Temperature detection step: under off-mode, detecting environment temperature, when environment temperature is less than first threshold, detection blower fan disk
Pipe leaving water temperature and return water temperature；
Judgment step: determine whether water temperature declines and decline degree according to the leaving water temperature and return water temperature；And
Rate-determining steps: whether decline and decline unlatching and the operation shape of the judgement result control water pump of degree according to the water temperature
State.
2. antifreeze control method according to claim 1, which is characterized in that further include: circulate operation step: interval is default
The temperature detection step, judgment step and rate-determining steps are recycled after time again.
3. antifreeze control method according to claim 2, which is characterized in that in the judgment step, according to the water outlet
The method that temperature and return water temperature determine whether water temperature declines includes:
When the leaving water temperature and return water temperature are all larger than second threshold, determine that water temperature does not decline；
When the leaving water temperature is less than second threshold or the return water temperature less than second threshold, judgement water temperature drop；Wherein institute
Second threshold is stated less than the first threshold, and the first threshold and the temperature difference of the second threshold are 5 DEG C.
4. antifreeze control method according to claim 3, which is characterized in that in the judgment step, according to the water outlet
Temperature and return water temperature determine that the method for water temperature drop degree includes:
When the leaving water temperature is less than the second threshold and is greater than third threshold value or the return water temperature is less than second threshold
It is worth and is greater than third threshold value, determines that water temperature drop degree is heavy duty；
When the leaving water temperature is less than the third threshold value and the return water temperature is less than the third threshold value, judgement water temperature drop
Degree is high risk grade；
Wherein the second threshold is greater than the third threshold value.
5. antifreeze control method according to claim 4, which is characterized in that in the rate-determining steps, according to the water temperature
The judgement result for whether declining and declining degree controls the unlatching of water pump and the method for operating status includes:
When determining that water temperature does not decline, water pump is not turned on or closes from open state；
When determining water temperature drop, water pump is run at the first time after opening；
When determining water temperature drop degree for heavy duty, continuous running after water pump is opened；
Continuous running and show that failure is reminded when determining water temperature drop degree for high risk grade, after water pump is opened, reminded contents
Are as follows: unit has bursting by freezing risk, powers off after please draining water.
6. antifreeze control method according to claim 5, which is characterized in that the circulate operation step includes:
After the operation of a temperature detection step, judgment step and rate-determining steps is completed, according to the operational circumstances interval of this time
Different preset times recycles the temperature detection step, judgment step and rate-determining steps again: when the secondary judgment step and
In rate-determining steps, determine that water temperature does not decline, corresponding water pump is not turned on or is spaced the first preset time again after open state closing
Secondary to recycle the temperature detection step, judgment step and rate-determining steps, first preset time is between 30~90min；When
In the secondary judgment step and rate-determining steps, determine to run at the first time, after first time after water temperature drop, corresponding water pump are opened
The temperature detection step, judgment step and rate-determining steps are recycled at once；In the secondary judgment step and rate-determining steps, determine
Water temperature drop degree is heavy duty, continuous running after corresponding water pump is opened, and recycles the temperature detection step every the second preset time
Suddenly, judgment step and rate-determining steps, second preset time is between 5~8min.
7. antifreeze control method according to claim 5, which is characterized in that the first time is 5min.
8. antifreeze control method according to claim 4, which is characterized in that the first threshold is 18 DEG C, the third
Threshold value is 5 DEG C.
9. a kind of antifreeze control system of fan coil characterized by comprising
Temperature detecting module, in the power-offstate, detecting environment temperature, when environment temperature is less than first threshold, detection
Fan coil leaving water temperature and return water temperature；
Judgment module, for determining whether water temperature declines and decline degree according to the leaving water temperature and return water temperature；And
Control module, the judgement result for whether declining and declining degree according to the water temperature control the unlatching and fortune of water pump
Row state.
10. a kind of air-conditioning, comprising antifreeze control system as claimed in claim 9 or using described in any one of claims 1 to 8
Antifreeze control method.
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| CN110220269B (en) | 2021-03-30 |
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