CN110925953B - Exhaust heat recovery anti-freezing control method, device and system - Google Patents
Exhaust heat recovery anti-freezing control method, device and system Download PDFInfo
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- CN110925953B CN110925953B CN201911269654.3A CN201911269654A CN110925953B CN 110925953 B CN110925953 B CN 110925953B CN 201911269654 A CN201911269654 A CN 201911269654A CN 110925953 B CN110925953 B CN 110925953B
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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
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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
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0007—Indoor units, e.g. fan coil units
- F24F1/0035—Indoor units, e.g. fan coil units characterised by introduction of outside air to the room
- F24F1/0038—Indoor units, e.g. fan coil units characterised by introduction of outside air to the room in combination with simultaneous exhaustion of inside air
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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
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0007—Indoor units, e.g. fan coil units
- F24F1/009—Indoor units, e.g. fan coil units characterised by heating arrangements
- F24F1/0093—Indoor units, e.g. fan coil units characterised by heating arrangements with additional radiant heat-discharging elements, e.g. electric heaters
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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
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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
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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
- F24F12/00—Use of energy recovery systems in air conditioning, ventilation or screening
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/20—Humidity
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/20—Humidity
- F24F2110/22—Humidity of the outside air
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/30—Velocity
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/30—Velocity
- F24F2110/32—Velocity of the outside air
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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]
- Y02B30/56—Heat recovery units
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- Engineering & Computer Science (AREA)
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
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- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The embodiment of the invention discloses an exhaust heat recovery anti-freezing control method, device and system, wherein the method comprises the following steps: acquiring heat recovery efficiency under current temperature, humidity and rotating speed conditions, calculating exhaust air temperature and exhaust air humidity of indoor exhaust air after heat recovery, judging that the exhaust air temperature and the exhaust air humidity of the indoor exhaust air after heat recovery reach freezing points, and acquiring the current freezing points as the temperature and the humidity after heat recovery under the current working condition; and taking the temperature value before the fresh air heat recovery as a heating target temperature value so as to control the electric heating device to heat the outdoor fresh air to the temperature before the fresh air heat recovery, correcting the heating capacity of the electric heating device, and taking the corrected heating capacity as the target heating capacity of the electric heating. The problem of among the prior art can't carry out accurate control to the electrical heating volume of the heat recovery of airing exhaust, and the heat recovery core that leads to freezes or the heat recovery efficiency can't maintain the technique is solved.
Description
Technical Field
The embodiment of the invention relates to the technical field of air conditioners, in particular to an exhaust heat recovery anti-freezing control method, device and system.
Background
In order to realize energy saving in an air conditioner with a fresh air adjusting system, the heat recovery process is carried out on the exhaust air of fresh air; at this time, if the outdoor temperature is low, when the exhaust heat recovery is carried out, the heat recovery core body is easy to freeze due to low fresh air temperature, high exhaust temperature and high moisture content, and the heat recovery efficiency is influenced; if the on and off of the electric heating is controlled according to the outdoor temperature, it is not favorable to control the heating power, and the heat recovery efficiency cannot be maintained at a high level.
Disclosure of Invention
Therefore, the embodiment of the invention provides an exhaust air heat recovery anti-freezing control method, device and system, so as to solve the technical problem that the heat recovery core is frozen or the heat recovery efficiency cannot be maintained because the electric heating quantity of the exhaust air heat recovery cannot be accurately controlled in the prior art.
In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:
an exhaust heat recovery anti-freezing control method, comprising:
obtaining the heat recovery efficiency under the current temperature, humidity and rotating speed conditions;
calculating the exhaust air temperature and the exhaust air humidity of the indoor exhaust air after heat recovery according to the heat recovery efficiency under the current temperature, humidity and rotating speed conditions;
judging whether the exhaust air temperature and the exhaust air humidity of indoor exhaust air after heat recovery reach freezing points, and acquiring the current freezing points as the temperature and the humidity of the indoor exhaust air after heat recovery under the current working condition;
acquiring fresh air volume, exhaust air volume, temperature and humidity before heat recovery corresponding to the exhaust air temperature and humidity after heat recovery under the current working condition, and taking the temperature value before fresh air heat recovery as a heating target temperature value so as to control the electric heating device to heat outdoor fresh air to the temperature before fresh air heat recovery;
and correcting the heating amount of the electric heating device, and taking the corrected heating amount as the target heating amount of the electric heating.
Further, the obtaining of the heat recovery efficiency under the current temperature, humidity and rotation speed conditions specifically includes:
acquiring fresh air temperature and fresh air humidity of outdoor fresh air before heat recovery, and exhaust air temperature and exhaust air humidity of indoor exhaust air before heat recovery;
acquiring the fresh air rotating speed of a fresh air fan and the exhaust rotating speed of an exhaust fan and/or the rotating speed of a rotary wheel heat recoverer, acquiring real-time fresh air volume according to the preset relation between the fresh air rotating speed and the air volume, and acquiring real-time exhaust air volume according to the preset relation between the exhaust rotating speed and the air volume;
and obtaining the heat recovery efficiency under the conditions of current temperature, humidity and rotating speed according to the fresh air temperature and the fresh air humidity before heat recovery, the exhaust air temperature and the exhaust air humidity of indoor exhaust air before heat recovery, the rotating speed of a fresh air fan and the rotating speed of an exhaust air fan and/or the rotating speed of a rotary wheel heat recoverer.
Further, according to the heat recovery efficiency under the current temperature and humidity and the rotational speed condition, the exhaust air temperature and the exhaust air humidity of the indoor exhaust air after heat recovery are calculated, and the method specifically comprises the following steps:
presetting heat recovery efficiency of fresh air and exhaust air at different wind speeds, temperatures and humidity, and establishing a heat recovery database of the fresh air and the exhaust air at different wind speeds, temperatures and humidity;
calculating the current heat recovery efficiency according to the temperatures and the humidity of the fresh air and the exhaust air before and after the current different wind speeds and heat recovery, and correcting and updating an original pre-established database;
the current outdoor temperature and humidity are collected, and the temperature and humidity values of indoor exhaust air after heat recovery are calculated under the current outdoor temperature and humidity, fresh air, exhaust air volume and heat recovery efficiency.
Further, the exhaust air temperature and the exhaust air humidity of the indoor exhaust air after heat recovery are calculated according to the heat recovery efficiency under the current temperature, humidity and rotating speed conditions; the method specifically comprises the following steps:
presetting heat recovery efficiency of fresh air and exhaust air at different wind speeds, rotating speeds of rotating wheels, temperatures and humidity, and establishing a heat recovery database of the fresh air and the exhaust air at different wind speeds, rotating speeds of rotating wheels, temperatures and humidity;
calculating the current heat recovery efficiency according to the current different wind speeds, rotating speed of the rotating wheel, and the temperature and humidity before and after heat exchange of the fresh air and the exhaust air, and correcting and updating the original pre-established database;
the current outdoor temperature and humidity are collected, and the temperature and humidity values of indoor exhaust air after heat recovery are calculated under the current outdoor temperature and humidity, fresh air, exhaust air volume, rotating speed of a rotating wheel and heat recovery efficiency.
Further, the correcting the heating amount of the electric heating device specifically includes:
calculating the electric heating power required by heating the fresh air from the outdoor temperature to the calculated temperature before the fresh air heat is recovered;
and according to the fact that the power for controlling electric heating is equal to the required electric heating power, the temperature of the heated fresh air is collected at the same time, the temperature is compared with the temperature obtained by calculating before the fresh air is heated, and the electric heating is corrected according to the comparison value. Further, the temperature and humidity values before the new wind heat recovery obtained by calculation are taken and corrected, and the method specifically comprises the following steps:
and (3) calculating the temperature and humidity value of the fresh air before heat recovery, and recalculating whether the exhaust temperature T after heat recovery meets the following formula according to the collected fresh air, the collected exhaust air volume and the collected exhaust temperature humidity value and the heat recovery efficiency under the working condition corresponding to the heat recovery efficiency database:
T-Tfreezing pointIf not, the temperature and humidity of the fresh air after current electric heating are taken as the outdoor temperature and humidity, the freezing point is recalculated and determined, and the electric heat value is calculated until the T-T is metFreezing pointThe value of (c) is within the range of (0, n).
Furthermore, the temperature and humidity after the new air correction calculation, the new air volume and the temperature and humidity before heating are calculated, the electric heating quantity required by the new air is calculated, the temperature of the new air after heating is collected and compared with the temperature before the new air heat recovery obtained through correction calculation, and the increase or decrease of the electric heating quantity is controlled and finely adjusted according to a comparison value.
The invention also provides an exhaust air heat recovery anti-freezing control device for implementing the method, which comprises the following steps:
the heat recovery efficiency acquisition unit is used for acquiring the heat recovery efficiency under the current temperature, humidity and rotating speed conditions;
the first temperature and humidity acquisition unit is used for calculating the exhaust air temperature and the exhaust air humidity of indoor exhaust air after heat recovery according to the heat recovery efficiency under the current temperature and humidity and rotating speed conditions;
the second temperature and humidity acquisition unit is used for judging that the exhaust air temperature and the exhaust air humidity of the indoor exhaust air after heat recovery reach freezing points, and acquiring the current freezing points as the temperature and the humidity of the indoor exhaust air after heat recovery under the current working condition;
the target temperature acquisition unit is used for acquiring the air volume, the air volume and the temperature of the fresh air after heat recovery corresponding to the exhaust temperature and the humidity after heat recovery under the current working condition, and taking the temperature value before fresh air heat recovery as a heating target temperature value so as to control the electric heating device to heat the outdoor fresh air to the temperature before fresh air heat recovery;
and the target heating amount acquisition unit is used for correcting the heating amount of the electric heating device and taking the corrected heating amount as the target heating amount of the electric heating.
The invention also provides an exhaust heat recovery anti-freezing control system, which comprises: a processor and a memory;
the memory is to store one or more program instructions;
the processor is configured to execute one or more program instructions to perform the method as described above.
The present invention also provides a computer storage medium having one or more program instructions embodied therein for executing the method as described above by an exhaust heat recovery antifreeze control system.
According to the exhaust air heat recovery anti-freezing control method provided by the invention, the exhaust air temperature and the exhaust air humidity of indoor exhaust air after heat recovery are calculated according to the heat recovery efficiency under the current temperature, humidity and rotating speed conditions by obtaining the heat recovery efficiency under the current temperature, humidity and rotating speed conditions, the exhaust air temperature and the exhaust air humidity of the indoor exhaust air after heat recovery are judged to reach a freezing point, and then the current freezing point is obtained as the temperature and humidity after heat recovery under the current working condition; acquiring the fresh air volume, the exhaust air volume, the temperature and the humidity of the fresh air volume before heat recovery corresponding to the current working condition, taking the temperature value before fresh air heat recovery as a heating target temperature value so as to control the electric heating device to heat outdoor fresh air to the temperature before fresh air heat recovery, correcting the heating capacity of the electric heating device, and taking the corrected heating capacity as the target heating capacity of electric heating. Therefore, the method utilizes the current freezing point and other performance parameters influencing the heat recovery efficiency as judgment parameters, and accurately controls the electric heating quantity of the exhaust heat recovery by correction, so that the heat recovery core body can not freeze, and meanwhile, the temperature of the fresh air after pretreatment is as low as possible, and the subsequent heat recovery is maintained at higher efficiency. Thereby solved among the prior art can't carry out accurate control to the electric heating volume of the heat recovery of airing exhaust, and the technical problem that the heat recovery core that leads to freezes or heat recovery efficiency can't maintain.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.
FIG. 1 is a flow chart of an embodiment of the method for controlling the recovery of exhaust heat and freeze protection provided by the present invention;
FIG. 2 is a block diagram of an embodiment of the anti-freezing device for recovering exhaust heat according to the present invention;
fig. 3 is a block diagram of an embodiment of the exhaust heat recovery anti-freezing control system provided by the present invention.
Description of reference numerals:
100-heat recovery efficiency acquisition unit 200-first temperature and humidity acquisition unit
300-second temperature and humidity acquisition unit 400-target temperature acquisition unit
500-target heating amount acquisition Unit
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In a specific embodiment, the exhaust air heat recovery anti-freezing control method provided by the invention is used for adjusting the electric heating quantity of outdoor fresh air at any time according to the freezing point temperature and the air conditioner operation parameters when the outdoor environment is low, so that the heat recovery efficiency of the fresh air exhaust is as high as possible under the condition that the heat recovery core is not frozen. As shown in fig. 1, the method includes:
s1: obtaining the heat recovery efficiency under the current temperature, humidity and rotating speed conditions; specifically, the acquiring of the heat recovery efficiency under the current temperature, humidity and rotation speed conditions includes:
acquiring fresh air temperature and fresh air humidity of outdoor fresh air before heat recovery, and exhaust air temperature and exhaust air humidity of indoor exhaust air before heat recovery;
acquiring the fresh air rotating speed of a fresh air fan and the exhaust rotating speed of an exhaust fan and/or the rotating speed of a rotary wheel heat recoverer, acquiring real-time fresh air volume according to the preset relation between the fresh air rotating speed and the air volume, and acquiring real-time exhaust air volume according to the preset relation between the exhaust rotating speed and the air volume;
and obtaining the heat recovery efficiency under the conditions of current temperature, humidity and rotating speed according to the fresh air temperature and the fresh air humidity before heat recovery, the exhaust air temperature and the exhaust air humidity of indoor exhaust air before heat recovery, the rotating speed of a fresh air fan and the rotating speed of an exhaust air fan and/or the rotating speed of a rotary wheel heat recoverer.
In the actual working process, the temperature, the humidity and the rotating speed are obtained through corresponding sensors, the fresh air temperature, the fresh air humidity and the exhaust air temperature and humidity in the current state are respectively detected through temperature and humidity sensors, the rotating speed of a fan or a rotating wheel is detected through a rotating speed sensor, and the heat recovery efficiency under the current temperature, humidity and rotating speed conditions is obtained according to a conventional calculation method; or after the current temperature and humidity and the rotating speed are obtained, comparing the current temperature and humidity with a preset database, and calling the corresponding heat recovery efficiency under the current temperature and humidity and rotating speed conditions prestored in the database.
S2: calculating the exhaust air temperature and the exhaust air humidity of the indoor exhaust air after heat recovery according to the heat recovery efficiency under the current temperature, humidity and rotating speed conditions; and calculating the exhaust air temperature and the exhaust air humidity after heat recovery under the heat recovery efficiency based on the corresponding heat recovery efficiency under the current condition called in the database.
Specifically, the process of calculating the exhaust air temperature and the exhaust air humidity of the indoor exhaust air after heat recovery according to the heat recovery efficiency under the current temperature, humidity and rotation speed conditions may include:
presetting heat recovery efficiency of fresh air and exhaust air at different wind speeds, temperatures and humidity, and establishing a heat recovery database of the fresh air and the exhaust air at different wind speeds, temperatures and humidity;
calculating the current heat recovery efficiency according to the temperatures and the humidity of the fresh air and the exhaust air before and after the current different wind speeds and heat recovery, and correcting and updating an original pre-established database;
the current outdoor temperature and humidity are collected, and the temperature and humidity values of indoor exhaust air after heat recovery are calculated under the current outdoor temperature and humidity, fresh air, exhaust air volume and heat recovery efficiency.
Or, the process of calculating the exhaust air temperature and the exhaust air humidity of the indoor exhaust air after heat recovery according to the heat recovery efficiency under the current temperature, humidity and rotation speed conditions may include:
presetting heat recovery efficiency of fresh air and exhaust air at different wind speeds, rotating speeds of rotating wheels, temperatures and humidity, and establishing a heat recovery database of the fresh air and the exhaust air at different wind speeds, rotating speeds of rotating wheels, temperatures and humidity;
and calculating the current heat recovery efficiency according to the fresh air and the exhaust air at different current wind speeds, rotating speeds of rotating wheels, temperatures and humidity, and correcting and updating the original pre-established database.
S3: judging whether the exhaust air temperature and the exhaust air humidity of indoor exhaust air after heat recovery reach freezing points, and acquiring the current freezing points as the temperature and the humidity of the indoor exhaust air after heat recovery under the current working condition; in step S2, after the exhaust air temperature and the exhaust air humidity after heat recovery are obtained, the temperature and the humidity of the freezing point of the core under the current equipment condition are respectively compared with each other, and if the temperature and the humidity reach the current freezing point, the temperature and the humidity at the current freezing point are used as the temperature and the humidity after heat recovery. And if the temperature and the humidity do not reach the current freezing point, taking the exhaust air temperature and the exhaust air humidity after heat recovery, which are obtained by calculation under the current heat recovery efficiency, as temperature and humidity output values, and ending the anti-freezing control.
S4: the air quantity of the fresh air before the heat recovery, the air quantity of the air exhaust and the temperature and the humidity of the fresh air before the heat recovery corresponding to the temperature and the humidity of the air exhaust after the heat recovery under the current working condition are obtained, and the temperature value before the fresh air heat recovery is used as a heating target temperature value, so that the electric heating device is controlled to heat the outdoor fresh air to the temperature before the fresh air heat recovery, the output temperature of the heated fresh air is higher than a freezing point, the temperature of the fresh air can be lowered as far as possible, and the higher heat recovery efficiency is guaranteed.
S5: and correcting the heating amount of the electric heating device, and taking the corrected heating amount as the target heating amount of the electric heating.
Wherein, revise the heating capacity of the said electric heater unit, include specifically:
calculating the electric heating power required by heating the fresh air from the outdoor temperature to the calculated temperature before the fresh air heat is recovered;
according to the fact that the power for controlling electric heating is equal to the required electric heating power, the temperature of the heated fresh air is collected at the same time, the temperature is compared with the temperature obtained by calculating before the fresh air is heated and the electric heating is corrected according to the comparison value; specifically, the calculated temperature and humidity value before the fresh air heat recovery are taken, and according to the collected fresh air, the air volume of the exhaust air and the temperature and humidity value of the exhaust air, and according to the heat recovery efficiency under the working condition corresponding to the heat recovery efficiency database, whether the exhaust air temperature T after the heat recovery meets the following formula is recalculated: T-TFreezing pointIf not, the temperature and humidity of the fresh air after current electric heating are taken as the outdoor temperature and humidity, the freezing point is recalculated and determined, and the electric heat value is calculated until the T-T is metFreezing pointThe value of (c) is within the range of (0, n). In the value range of (0, n), in order to meet the higher performance requirement, the value of n should be as close to 0 as possible and not equal to a value of 0, and generally is any value within a range greater than zero and less than 1.
The temperature and the humidity after the new trend correction calculation, the new air volume and the temperature and the humidity before heating, calculate the electric heating quantity required by the new trend, collect the new trend temperature after the heating, compare with the new trend temperature before heat recovery obtained by the correction calculation, and control the increase or decrease of the fine tuning electric heating quantity according to the comparison value.
It should be noted that, the current operating condition herein refers to: the heat recovery working condition under the current fresh air, the air volume of the exhaust air and the temperature and the humidity before the heat exchange.
In the above specific embodiment, the exhaust air heat recovery anti-freezing control method provided by the invention calculates the exhaust air temperature and the exhaust air humidity of the indoor exhaust air after heat recovery according to the heat recovery efficiency under the current temperature, humidity and rotation speed conditions by obtaining the heat recovery efficiency under the current temperature, humidity and rotation speed conditions, determines that the exhaust air temperature and the exhaust air humidity of the indoor exhaust air after heat recovery reach the freezing point, and obtains the current freezing point as the temperature and humidity after heat recovery under the current working condition; acquiring the fresh air volume, the exhaust air volume, the temperature and the humidity of the fresh air volume before heat recovery corresponding to the current working condition, taking the temperature value before fresh air heat recovery as a heating target temperature value so as to control the electric heating device to heat outdoor fresh air to the temperature before fresh air heat recovery, correcting the heating capacity of the electric heating device, and taking the corrected heating capacity as the target heating capacity of electric heating. Therefore, the method utilizes the current freezing point and other performance parameters influencing the heat recovery efficiency as judgment parameters, and accurately controls the electric heating quantity of the exhaust heat recovery by correction, so that the heat recovery core body can not freeze, and meanwhile, the temperature of the fresh air after pretreatment is as low as possible, and the subsequent heat recovery is maintained at higher efficiency. Thereby solved among the prior art can't carry out accurate control to the electric heating volume of the heat recovery of airing exhaust, and the technical problem that the heat recovery core that leads to freezes or heat recovery efficiency can't maintain.
In addition to the above method, the present invention also provides an exhaust heat recovery antifreeze control apparatus for carrying out the method as described above, as shown in fig. 2, the apparatus comprising:
a heat recovery efficiency obtaining unit 100, where the heat recovery efficiency obtaining unit 100 is configured to obtain heat recovery efficiency under current temperature, humidity and rotation speed conditions; the heat recovery efficiency acquiring unit 100 is specifically configured to: acquiring fresh air temperature and fresh air humidity of outdoor fresh air before heat recovery, and exhaust air temperature and exhaust air humidity of indoor exhaust air before heat recovery; acquiring the fresh air rotating speed of a fresh air fan and the exhaust rotating speed of an exhaust fan and/or the rotating speed of a rotary wheel heat recoverer, acquiring real-time fresh air volume according to the preset relation between the fresh air rotating speed and the air volume, and acquiring real-time exhaust air volume according to the preset relation between the exhaust rotating speed and the air volume; and obtaining the heat recovery efficiency under the conditions of current temperature, humidity and rotating speed according to the fresh air temperature and the fresh air humidity before heat recovery, the exhaust air temperature and the exhaust air humidity of indoor exhaust air before heat recovery, the rotating speed of a fresh air fan and the rotating speed of an exhaust air fan and/or the rotating speed of a rotary wheel heat recoverer.
In the actual working process, the temperature, the humidity and the rotating speed are obtained through corresponding sensors, the fresh air temperature, the fresh air humidity and the exhaust air temperature and humidity in the current state are respectively detected through temperature and humidity sensors, the rotating speed of a fan or a rotating wheel is detected through a rotating speed sensor, and the heat recovery efficiency under the current temperature, humidity and rotating speed conditions is obtained according to a conventional calculation method; or after the current temperature and humidity and the rotating speed are obtained, comparing the current temperature and humidity with a preset database, and calling the corresponding heat recovery efficiency under the current temperature and humidity and rotating speed conditions prestored in the database.
A first temperature and humidity obtaining unit 200, where the first temperature and humidity obtaining unit 200 is configured to calculate an exhaust air temperature and an exhaust air humidity of indoor exhaust air after heat recovery according to heat recovery efficiency under current temperature and humidity and rotation speed conditions; first humiture acquisition unit 200 specifically is used for: presetting heat recovery efficiency of fresh air and exhaust air at different wind speeds, temperatures and humidity, and establishing a heat recovery database of the fresh air and the exhaust air at different wind speeds, temperatures and humidity; calculating the current heat recovery efficiency according to the fresh air and the exhaust air at different current wind speeds, temperatures and humidity, and correcting and updating an original pre-established database; the current outdoor temperature and humidity are collected, and the temperature and humidity values of indoor exhaust air after heat recovery are calculated under the current outdoor temperature and humidity, fresh air, exhaust air volume and heat recovery efficiency.
Or, the first temperature and humidity acquisition unit 200 is specifically configured to: presetting heat recovery efficiency of fresh air and exhaust air at different wind speeds, rotating speeds of rotating wheels, temperatures and humidity, and establishing a heat recovery database of the fresh air and the exhaust air at different wind speeds, rotating speeds of rotating wheels, temperatures and humidity; and calculating the current heat recovery efficiency according to the fresh air and the exhaust air at different current wind speeds, rotating speeds of rotating wheels, temperatures and humidity, and correcting and updating the original pre-established database.
A second temperature and humidity obtaining unit 300, where the second temperature and humidity obtaining unit 300 is configured to determine that an exhaust air temperature and an exhaust air humidity of indoor exhaust air after heat recovery reach a freezing point, and obtain the current freezing point as the temperature and humidity after heat recovery under the current working condition; in the actual working process, after the exhaust air temperature and the exhaust air humidity after heat recovery are obtained, the temperature and the humidity of the freezing point of the core under the current equipment condition are respectively compared, and if the temperature and the humidity reach the current freezing point, the temperature and the humidity of the current freezing point are used as the temperature and the humidity after heat recovery. And if the temperature and the humidity do not reach the current freezing point, taking the exhaust air temperature and the exhaust air humidity after heat recovery, which are obtained by calculation under the current heat recovery efficiency, as temperature and humidity output values, and ending the anti-freezing control.
Target temperature obtains unit 400, this target temperature obtains unit 400 is used for obtaining the new trend amount of wind after the heat recovery that corresponds under current operating mode, the amount of wind and the temperature of airing exhaust, and regard as the heating target temperature value with the temperature value before the new trend heat recovery, so that control electric heater unit with outdoor new trend heating to the temperature before the new trend heat recovery, thereby guarantee that the output temperature of new trend after the heating is higher than freezing point, and make the temperature of new trend can be as low as possible, in order to guarantee higher heat recovery efficiency.
A target heating amount obtaining unit 500, wherein the target heating amount obtaining unit 500 is used for correcting the heating amount of the electric heating device, and the corrected heating amount is used as the target heating amount of the electric heating.
The target heating amount obtaining unit 500 corrects the heating amount of the electric heating device, and specifically includes:
calculating the electric heating power required by heating the fresh air from the outdoor temperature to the calculated temperature before the fresh air heat is recovered;
according to the fact that the power for controlling electric heating is equal to the required electric heating power, the temperature of the heated fresh air is collected at the same time, the temperature is compared with the temperature obtained by calculating before the fresh air is heated and the electric heating is corrected according to the comparison value; specifically, the calculated temperature and humidity value before the fresh air heat recovery are taken, and whether the exhaust air temperature T after the heat recovery meets the requirement of the heat recovery efficiency under the working condition corresponding to the heat recovery efficiency database is recalculated according to the collected fresh air, the exhaust air quantity and the exhaust temperature humidity value and the heat recovery efficiency under the working condition corresponding to the heat recovery efficiency databaseThe following equation: T-TFreezing pointIf not, the temperature and humidity of the fresh air after current electric heating are taken as the outdoor temperature and humidity, the freezing point is recalculated and determined, and the electric heat value is calculated until the T-T is metFreezing pointThe value of (c) is within the range of (0, n). In the value range of (0, n), in order to meet the higher performance requirement, the value of n should be as close to 0 as possible and not equal to a value of 0, and generally is any value within a range greater than zero and less than 1.
In the above specific embodiment, the exhaust air heat recovery anti-freezing control device provided by the invention calculates the exhaust air temperature and the exhaust air humidity of the indoor exhaust air after heat recovery according to the heat recovery efficiency under the current temperature, humidity and rotation speed conditions by obtaining the heat recovery efficiency under the current temperature, humidity and rotation speed conditions, determines that the exhaust air temperature and the exhaust air humidity of the indoor exhaust air after heat recovery reach the freezing point, and obtains the current freezing point as the temperature and the humidity after heat recovery under the current working condition; acquiring the fresh air volume, the exhaust air volume, the temperature and the humidity of the fresh air volume before heat recovery corresponding to the current working condition, taking the temperature value before fresh air heat recovery as a heating target temperature value so as to control the electric heating device to heat outdoor fresh air to the temperature before fresh air heat recovery, correcting the heating capacity of the electric heating device, and taking the corrected heating capacity as the target heating capacity of electric heating. Therefore, the method utilizes the current freezing point and other performance parameters influencing the heat recovery efficiency as judgment parameters, and accurately controls the electric heating quantity of the exhaust heat recovery by correction, so that the heat recovery core body can not freeze, and meanwhile, the temperature of the fresh air after pretreatment is as low as possible, and the subsequent heat recovery is maintained at higher efficiency. Thereby solved among the prior art can't carry out accurate control to the electric heating volume of the heat recovery of airing exhaust, and the technical problem that the heat recovery core that leads to freezes or heat recovery efficiency can't maintain.
According to a third aspect of the embodiments of the present invention, there is also provided an exhaust heat recovery antifreeze control system, as shown in fig. 3, including: a processor 201 and a memory 202;
the memory is to store one or more program instructions;
the processor is configured to execute one or more program instructions to perform the method as described above.
In correspondence with the above embodiments, embodiments of the present invention also provide a computer storage medium containing one or more program instructions therein. Wherein the one or more program instructions are for executing the method as described above by an exhaust heat recovery antifreeze control system.
In an embodiment of the invention, the processor may be an integrated circuit chip having signal processing capability. The Processor may be a general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete Gate or transistor logic device, discrete hardware component.
The various methods, steps and logic blocks disclosed in the embodiments of the present invention may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The processor reads the information in the storage medium and completes the steps of the method in combination with the hardware.
The storage medium may be a memory, for example, which may be volatile memory or nonvolatile memory, or which may include both volatile and nonvolatile memory.
The nonvolatile Memory may be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable PROM (EEPROM), or a flash Memory.
The volatile Memory may be a Random Access Memory (RAM) which serves as an external cache. By way of example and not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), SLDRAM (SLDRAM), and Direct Rambus RAM (DRRAM).
The storage media described in connection with the embodiments of the invention are intended to comprise, without being limited to, these and any other suitable types of memory.
Those skilled in the art will appreciate that the functionality described in the present invention may be implemented in a combination of hardware and software in one or more of the examples described above. When software is applied, the corresponding functionality may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a general purpose or special purpose computer.
The above embodiments are only for illustrating the embodiments of the present invention and are not to be construed as limiting the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made on the basis of the embodiments of the present invention shall be included in the scope of the present invention.
Claims (10)
1. An exhaust air heat recovery anti-freezing control method is characterized by comprising the following steps:
obtaining the heat recovery efficiency under the current temperature, humidity and rotating speed conditions;
calculating the exhaust air temperature and the exhaust air humidity of the indoor exhaust air after heat recovery according to the heat recovery efficiency under the current temperature, humidity and rotating speed conditions;
judging that the exhaust air temperature and the exhaust air humidity of indoor exhaust air after heat recovery reach freezing points, and acquiring the current freezing points as the exhaust air temperature and the exhaust air humidity after heat recovery under the current working condition; if the temperature and the humidity do not reach the current freezing point, taking the exhaust air temperature and the exhaust air humidity after heat recovery, which are obtained by calculation under the current heat recovery efficiency, as temperature and humidity output values, and ending the anti-freezing control;
acquiring fresh air volume, exhaust air volume, temperature and humidity before heat recovery corresponding to the exhaust air temperature and humidity after heat recovery under the current working condition, and taking the temperature value before fresh air heat recovery as a heating target temperature value so as to control the electric heating device to heat outdoor fresh air to the temperature before fresh air heat recovery;
and correcting the heating amount of the electric heating device, and taking the corrected heating amount as the target heating amount of the electric heating.
2. The exhaust air heat recovery anti-freezing control method according to claim 1, wherein the obtaining of the heat recovery efficiency under the current temperature, humidity and rotation speed conditions specifically comprises:
acquiring fresh air temperature and fresh air humidity of outdoor fresh air before heat recovery, and exhaust air temperature and exhaust air humidity of indoor exhaust air before heat recovery;
acquiring the fresh air rotating speed of a fresh air fan and the exhaust rotating speed of an exhaust fan and/or the rotating speed of a rotary wheel heat recoverer, acquiring real-time fresh air volume according to the preset relation between the fresh air rotating speed and the air volume, and acquiring real-time exhaust air volume according to the preset relation between the exhaust rotating speed and the air volume;
and checking a heat recovery efficiency database according to the fresh air temperature and the fresh air humidity before heat recovery, the exhaust air temperature and the exhaust air humidity of indoor exhaust air before heat recovery, the rotation speed of a fresh air fan and the rotation speed of an exhaust air fan and/or the rotation speed of a rotary wheel heat recoverer to obtain the heat recovery efficiency under the conditions of current temperature and humidity and rotation speed.
3. The exhaust air heat recovery anti-freezing control method according to claim 1, characterized in that the exhaust air temperature and the exhaust air humidity of the indoor exhaust air after heat recovery are calculated according to the heat recovery efficiency under the current temperature, humidity and rotation speed conditions; the method specifically comprises the following steps:
presetting heat recovery efficiency of fresh air and exhaust air at different wind speeds, temperatures and humidity, and establishing a heat recovery database of the fresh air and the exhaust air at different wind speeds, temperatures and humidity;
calculating the current heat recovery efficiency according to the temperatures and humidities of the fresh air and the exhaust air before and after the current different wind speeds and heat recovery, and correcting and updating an original pre-established database;
the current outdoor temperature and humidity are collected, and the temperature and humidity values of indoor exhaust air subjected to heat recovery under the current outdoor temperature and humidity, fresh air, exhaust air volume and heat recovery efficiency are calculated.
4. The exhaust air heat recovery anti-freezing control method according to claim 1, characterized in that the exhaust air temperature and the exhaust air humidity of the indoor exhaust air after heat recovery are calculated according to the heat recovery efficiency under the current temperature, humidity and rotation speed conditions; the method specifically comprises the following steps:
presetting heat recovery efficiency of fresh air and exhaust air at different wind speeds, rotating speeds of rotating wheels, temperatures and humidity, and establishing a heat recovery database of the fresh air and the exhaust air at different wind speeds, rotating speeds of rotating wheels, temperatures and humidity;
calculating the current heat recovery efficiency according to the current different wind speeds, rotating speed of the rotating wheel, and the temperature and humidity before and after heat exchange of the fresh air and the exhaust air, and correcting and updating the original pre-established database;
the current outdoor temperature and humidity are collected, and the temperature and humidity values of indoor exhaust air after heat recovery are calculated under the current outdoor temperature and humidity, the fresh air exhaust air volume, the rotating speed of the rotating wheel and the heat recovery efficiency.
5. The exhaust air heat recovery anti-freezing control method according to claim 3 or 4, wherein the correction of the heating amount of the electric heating device specifically comprises:
calculating the electric heating power required by heating the fresh air from the outdoor temperature to the calculated temperature before the fresh air heat is recovered;
and according to the fact that the power for controlling electric heating is equal to the required electric heating power, the temperature of the heated fresh air is collected at the same time, the temperature is compared with the temperature obtained by calculating before the fresh air is heated, and the electric heating is corrected according to the comparison value.
6. The exhaust air heat recovery anti-freezing control method according to claim 5, wherein the calculated temperature and humidity values before the fresh air heat recovery are taken and corrected, and the method specifically comprises the following steps:
and (3) calculating the temperature and humidity value of the fresh air before heat recovery, and recalculating whether the exhaust temperature T after heat recovery meets the following formula according to the collected fresh air, the collected exhaust air volume and the collected exhaust temperature humidity value and the heat recovery efficiency under the working condition corresponding to the heat recovery efficiency database:
T-Tfreezing pointIf not, the temperature and humidity of the fresh air after current electric heating are taken as the outdoor temperature and humidity, the freezing point is recalculated and determined, and the electric heat value is calculated until the T-T is metFreezing pointThe value of (c) is within the range of (0, n).
7. The exhaust air heat recovery anti-freezing control method according to claim 6, characterized in that the temperature and humidity after the fresh air correction calculation, the fresh air volume and the temperature and humidity before heating are calculated, the electric heating amount required by the fresh air is calculated, the heated fresh air temperature is collected and compared with the temperature before the fresh air heat recovery obtained by the correction calculation, and the increase or decrease of the electric heating amount is controlled and finely adjusted according to a comparison value.
8. An exhaust heat recovery antifreeze control apparatus for carrying out the method of any of claims 1 to 6, said apparatus comprising:
the heat recovery efficiency acquisition unit is used for acquiring the heat recovery efficiency under the current temperature, humidity and rotating speed conditions;
the first temperature and humidity acquisition unit is used for calculating the exhaust air temperature and the exhaust air humidity of indoor exhaust air after heat recovery according to the heat recovery efficiency under the current temperature and humidity and rotating speed conditions;
the second temperature and humidity acquisition unit is used for judging that the exhaust air temperature and the exhaust air humidity of the indoor exhaust air after heat recovery reach freezing points, and acquiring the current freezing points as the temperature and the humidity of the indoor exhaust air after heat recovery under the current working condition;
the target temperature acquisition unit is used for acquiring the air volume, the air volume and the temperature of the fresh air after heat recovery corresponding to the exhaust temperature and the humidity after heat recovery under the current working condition, and taking the temperature value before fresh air heat recovery as a heating target temperature value so as to control the electric heating device to heat the outdoor fresh air to the temperature before fresh air heat recovery;
and the target heating amount acquisition unit is used for correcting the heating amount of the electric heating device and taking the corrected heating amount as the target heating amount of the electric heating.
9. An exhaust heat recovery anti-freezing control system, characterized in that the system comprises: a processor and a memory;
the memory is to store one or more program instructions;
the processor, configured to execute one or more program instructions to perform the method of any of claims 1-6.
10. A computer storage medium, comprising one or more program instructions embodied in the computer storage medium, the one or more program instructions for executing the method of any of claims 1-6 by an exhaust heat recovery antifreeze control system.
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| CN116734371A (en) * | 2022-03-10 | 2023-09-12 | 森德(中国)暖通设备有限公司 | Deep heat recovery fresh air system and anti-freezing control method thereof |
| CN115406086B (en) * | 2022-08-25 | 2024-06-21 | 广东芬尼能源技术有限公司 | Fresh air quantity control method, device, equipment and storage medium |
| CN116642262B (en) * | 2023-07-20 | 2023-10-17 | 博纳环境设备(太仓)有限公司 | Intelligent management method and system for heat recovery of industrial air conditioner |
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