CN113048611A - Control method for automatically adjusting set water temperature of water chilling unit - Google Patents
Control method for automatically adjusting set water temperature of water chilling unit Download PDFInfo
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- CN113048611A CN113048611A CN201911379477.4A CN201911379477A CN113048611A CN 113048611 A CN113048611 A CN 113048611A CN 201911379477 A CN201911379477 A CN 201911379477A CN 113048611 A CN113048611 A CN 113048611A
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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
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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
- F24F11/46—Improving electric energy efficiency or saving
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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
- 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
- F24F11/65—Electronic processing for selecting an operating mode
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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
- F24F11/70—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
- F24F11/81—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the air supply to heat-exchangers or bypass channels
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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
Abstract
The invention relates to a control method for automatically adjusting set water temperature of a water chilling unit, which comprises the following steps: dividing the environment temperature into a plurality of environment temperature intervals, dividing one day into a plurality of time intervals, and setting a corresponding water temperature set value for each time interval in each environment temperature interval; measuring actual ambient temperature and actual time; selecting an ambient temperature interval, in which the measured actual ambient temperature falls, among a plurality of ambient temperature intervals, and selecting a time interval, in which the measured actual time falls, among a plurality of time intervals; and based on the selected environment temperature interval and the time interval, the water chilling unit automatically selects the corresponding water temperature set value. The control method can automatically adjust the water temperature set value of the water chilling unit according to the change of the environmental temperature, so that the energy consumption can be saved, the manual operation is reduced, the user experience is enhanced, and the intelligent control of the water temperature is realized.
Description
Technical Field
The present invention relates to a method of controlling an air conditioning system, and more particularly, to a control method for automatically adjusting a set water temperature of a chiller.
Background
The chiller, which can be one of the central air conditioners, conducts heat through water (referred to as coolant), including but not limited to water-cooled chillers and air-cooled chillers. The chiller may employ a vapor compression refrigeration cycle (e.g., using a screw compressor or scroll compressor) or an absorption refrigeration cycle. The water chilling unit adopting the vapor compression refrigeration cycle firstly uses a refrigerant (such as Freon or other substitutes) to supply water for cooling (refrigeration) or heating (heating) to a certain temperature (called as 'water outlet temperature' or 'water supply temperature'); the cooled or heated water is conveyed into a heat exchange coil of the central air-conditioning system to cool or heat the air; the cooled or heated air is then sent to a space (conditioned space) requiring cooling or heating, such as an office or the like; the water transferring heat to the air is heated or cooled to a certain temperature (called as "return water temperature") and then returned to the water chilling unit to be cooled or heated again, so that a new refrigeration or heating cycle is started. In order to achieve the temperature setting target of the conditioned space, it is necessary to control the water temperature (generally referred to as "return water temperature") of the chiller.
At present, the water temperature setting and the adjustment of the water temperature setting value of a water chilling unit are basically performed through manual operation. Once the water temperature is set, the chiller is unable to automatically adjust the water temperature set point based on changes in the ambient temperature, even if the ambient temperature has changed in a magnitude that renders the original water temperature set point unsuitable. If the fluctuation range of the external environment temperature exceeds a certain range and the set value of the water temperature is not changed, the comfort of the user side is deteriorated, and supercooling or overheating is caused. Such overcooling or overheating causes the end user to have to readjust the set temperature, thus causing frequent user operations and degrading the user's experience. Objectively, the external ambient temperature may vary greatly within a day, for example, the temperature difference may be large in different time periods of individual regions, thereby causing a phenomenon that the user frequently changes the water temperature.
To address this problem, the prior art has developed to divide the day into a plurality of time periods and to change the water temperature set point according to these time periods. For example, the working period of a day is divided into four time intervals: 8:00-10:00, 10:00-12:00, 12:00-14:00 and 14:00-16:00, and sets a corresponding water temperature set value for each time interval as shown in table 1 below.
TABLE 1
| Starting time | End time | Set water temperature |
| 8：00 | 10：00 | 20℃ |
| 10：00 | 12：00 | 15℃ |
| 12：00 | 14：00 | 10℃ |
| 14：00 | 18：00 | 15℃ |
This solution of setting the water temperature on a time of day basis has the disadvantage that the accuracy of the water temperature control is not accurate enough. This is because the ambient temperature may vary greatly during the day, and the chiller cannot automatically make fine adjustments to the water temperature set point in response to changes in the ambient temperature, which results in different heat losses from the water system and different temperature demands on the consumer side. When the ambient temperature is high, if the set value of the water temperature in the period is high and exceeds the energy requirement of the indoor side, the energy waste is caused. When the ambient temperature is low, if the set value of the water temperature in this period is low, the set value of the indoor temperature cannot be realized, and the user may feel cold, which may cause dissatisfaction.
Accordingly, there is a need in the art for a new solution to the above problems.
Disclosure of Invention
In order to solve the above-mentioned problems in the prior art, that is, to solve the technical problem that the water temperature setting of the water chilling unit cannot be automatically adjusted according to the environmental temperature change, the present invention provides a control method for automatically adjusting the set water temperature of the water chilling unit, the control method comprising: dividing the environment temperature into a plurality of environment temperature intervals, dividing one day into a plurality of time intervals, and setting a corresponding water temperature set value for each time interval in each environment temperature interval; measuring actual ambient temperature and actual time; selecting an ambient temperature interval, within the plurality of ambient temperature intervals, in which the measured actual ambient temperature falls, and selecting a time interval, within the plurality of time intervals, in which the measured actual time falls; and based on the selected ambient temperature interval and time interval, the chiller automatically selects the corresponding water temperature set point.
In a preferable technical solution of the control method for automatically adjusting the set water temperature of the water chilling unit, the plurality of environmental temperature sections include four environmental temperature sections.
In a preferred embodiment of the control method for automatically adjusting the set water temperature of the water chilling unit, the water chilling unit has a cooling operation mode and a heating operation mode, and the control method includes: setting a plurality of refrigeration environment temperature intervals and corresponding refrigeration water temperature set values for the refrigeration operation mode; and setting a plurality of heating environment temperature intervals and a plurality of heating water temperature set values for the heating operation mode.
In the above preferred technical solution of the control method for automatically adjusting the set water temperature of a chiller, in the cooling operation mode, the set value of the cooling water temperature is decreased along with an increase of the ambient temperature corresponding to the cooling ambient temperature interval in the same time interval.
In the above-described control method for automatically adjusting the set water temperature of the water chilling unit, in the heating operation mode, the set heating water temperature value is decreased as the ambient temperature corresponding to the heating ambient temperature zone increases within the same time interval.
In an preferable technical solution of the control method for automatically adjusting the set water temperature of the water chilling unit, the plurality of cooling environment temperature intervals include: the actual environmental temperature is more than 30 ℃, 30 ℃ is more than or equal to the actual environmental temperature of more than 27 ℃, 27 ℃ is more than or equal to the actual environmental temperature of more than 24 ℃, and 24 ℃ is more than or equal to the actual environmental temperature.
In a preferable embodiment of the control method for automatically adjusting the set water temperature of the water chiller, the plurality of heating environment temperature zones include: the actual ambient temperature is more than 5 ℃, 5 ℃ is more than or equal to the actual ambient temperature > -10 ℃, and-10 ℃ is more than or equal to the actual ambient temperature.
In the above preferred technical solution of the control method for automatically adjusting the set water temperature of the water chilling unit, when the measured actual ambient temperature does not fall within any ambient temperature interval, the water chilling unit adopts a manually set water temperature set value.
In the above preferred embodiment of the control method for automatically adjusting the set water temperature of the water chilling unit, the one day is divided into an operating time and a non-operating time, and the plurality of time intervals are divided into: 8:00-10:00, 10:00-12:00, 12:00-14:00, and 14:00-17: 00.
In the above preferred technical solution of the control method for automatically adjusting the set water temperature of the water chilling unit, the water chilling unit may operate based on a preset water temperature set value or a manually set water temperature set value at the non-operating time.
As can be understood by those skilled in the art, in the technical solution of the control method for automatically adjusting the set water temperature of the chiller according to the present invention, for the purpose of automatically adjusting the set water temperature of the chiller, the control method needs to divide the ambient temperature into a plurality of ambient temperature intervals and a day into a plurality of time intervals, and set a corresponding set water temperature value for each time interval in each ambient temperature interval. The control method also requires measuring the actual ambient temperature and the actual time, then selecting an ambient temperature interval in which the actual ambient temperature falls among a plurality of ambient temperature intervals, and selecting a time interval in which the actual time falls among a plurality of time intervals. Based on the selected environment temperature interval and the time interval, the control method automatically selects the corresponding water temperature set value for the water chilling unit. The external environment temperature does not change over time in a single day, but also changes due to factors such as climate, and the temperature difference may be large in different time periods in individual regions. The control method can automatically adjust the set water temperature in time according to two dimensions of the change of the environmental temperature and the change of time, not only improves the intelligence and the convenience of the water chilling unit, but also can save energy consumption and enhance the experience of users.
Preferably, under the condition that the water chiller has a cooling operation mode and a heating operation mode, aiming at the cooling operation mode and the heating operation mode, the control method of the invention respectively sets a plurality of cooling environment temperature intervals, a plurality of heating environment temperature intervals, and corresponding cooling water temperature set values and heating water temperature set values so as to meet different heat load requirements of cooling and heating.
Preferably, in the cooling operation mode and the heating operation mode, in the same time interval, not only the cooling water temperature set value is decreased with an increase in the ambient temperature corresponding to the cooling ambient temperature interval, but also the heating water temperature set value is decreased with an increase in the ambient temperature corresponding to the heating ambient temperature interval. Therefore, the heat demand of the user can be met, and the energy consumption can be saved.
Drawings
Preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:
FIG. 1 is a flow chart of a control method for automatically adjusting the set water temperature of a chiller according to the present invention;
fig. 2 is a flowchart of an embodiment of a control method for automatically adjusting a set water temperature of a chiller according to the present invention.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.
In order to solve the technical problem that the water temperature setting of the existing water chilling unit cannot be automatically adjusted according to the change of the environmental temperature, the invention provides a control method for automatically adjusting the set water temperature of the water chilling unit, which comprises the following steps: dividing the ambient temperature into a plurality of ambient temperature sections, dividing one day into a plurality of time sections, and setting a corresponding water temperature set value for each time section in each ambient temperature section (step S1); measuring an actual ambient temperature and an actual time (step S2); selecting an ambient temperature section in which the measured actual ambient temperature falls among a plurality of ambient temperature sections, and selecting a time section in which the measured actual time falls among a plurality of time sections (step S3); and based on the selected ambient temperature interval and time interval, the chiller automatically selects the corresponding water temperature set point (step S4). The control method can automatically adjust the water temperature set value of the water chilling unit according to the change of the environmental temperature and the time, thereby reducing manual operation, enhancing the user experience and realizing intelligent control of the water temperature. Specifically, when the external environment temperature is high, the water temperature set value of the water chilling unit is automatically reduced, the waste of energy is reduced, and the cost is saved for a user; when the ambient temperature is lower, the water temperature set value of the water chilling unit is automatically adjusted to be high, so that the indoor temperature is improved, and the comfort of a user is improved. Particularly, the control method has obvious effect on scenes with special rules for the flow of personnel in large offices, markets, supermarkets and the like.
Reference herein to a water temperature set point generally refers to a set point for the return water temperature of the chiller. Alternatively, the water temperature set value may be a set value of the water supply temperature of the water chilling unit according to actual needs.
The chiller presented herein may be a chiller employing a vapor compression refrigeration cycle (e.g., a screw chiller or a scroll chiller) or an absorption refrigeration cycle (e.g., a lithium bromide absorption chiller), but is not limited to these types of chillers.
The process steps referred to herein are not necessarily required to be in the order of their presentation unless specifically stated, e.g., some process steps may be performed concurrently.
Fig. 1 is a flowchart of a control method for automatically adjusting a set water temperature of a chiller according to the present invention. The ambient temperature of the outside environment may vary not only with time during the day but also greatly due to factors such as weather. Based on such a fact, as shown in fig. 1, the control method of the present invention employs a strategy of dividing the ambient temperature into a plurality of ambient temperature sections, further dividing one day into a plurality of time sections, and setting a corresponding water temperature set value for each time section in each ambient temperature section (step S1). The chiller operates by measuring the ambient temperature of the outside to obtain an actual ambient temperature, and also measuring the actual time (step S2). In step S3, the ambient temperature interval in which it falls is selected based on the measured ambient temperature, and the time interval in which it falls is selected based on the measured actual time. In step S4, the chiller automatically selects a water temperature set value corresponding to the selected ambient temperature interval and time interval based on the selected ambient temperature interval and time interval.
In one or more embodiments, different ambient temperature zones are set based on the cooling and heating modes of operation of the chiller. In a cooling mode of operation (e.g., operation in summer), the ambient temperature is divided into a plurality of cooling ambient temperature intervals. Optionally, the plurality of refrigeration environment temperature intervals includes four refrigeration environment temperature intervals. The four refrigeration ambient temperature intervals may be defined by three ambient temperature interval ends: a first ambient temperature interval end Ts1, a second ambient temperature interval end Ts2, and a third ambient temperature interval end Ts3, wherein Ts1> Ts2> Ts 3. The four refrigeration environment temperature intervals are as follows: the actual environment temperature Tao is greater than the first environment temperature interval end value Ts1, the first environment temperature interval end value Ts1 is greater than or equal to the actual environment temperature Tao and greater than the second environment temperature interval end value Ts2, the second environment temperature interval end value Ts2 is greater than or equal to the actual environment temperature Tao and greater than or equal to the third environment temperature interval end value Ts3, and the third environment temperature interval end value Ts3 is greater than or equal to the actual environment temperature Tao. In one or more embodiments, in the cooling mode of operation, the first ambient temperature interval end Ts1, the second ambient temperature interval end Ts2, and the third ambient temperature interval end Ts3 may be 30 ℃, 27 ℃, and 24 ℃ in that order. In other embodiments, the ends of the temperature intervals may be adjusted higher or lower according to actual needs. Alternatively, the four refrigeration ambient temperature intervals may also be defined by four ambient temperature interval ends: a first environment temperature interval end Ts1, a second environment temperature interval end Ts2, a third environment temperature interval end Ts3 and a fourth environment temperature interval end Ts4, wherein Ts1> Ts2> Ts3> Ts 4. Correspondingly, the four refrigeration environment temperature intervals are: the actual environment temperature Tao is greater than a first environment temperature interval end value Ts1, the first environment temperature interval end value Ts1 is greater than or equal to the actual environment temperature Tao and greater than a second environment temperature interval end value Ts2, the second environment temperature interval end value Ts3 is greater than or equal to the actual environment temperature Tao and greater than a third environment temperature interval end value Ts3, and the third environment temperature interval end value Ts3 is greater than or equal to the actual environment temperature Tao and greater than a fourth environment temperature interval end value Ts 4. Alternatively, the refrigerated ambient temperature interval may also include more or less than four temperature intervals, and accordingly, the ambient temperature interval end values may also be more or less, according to actual needs.
Table 2 below provides an example of setting an ambient temperature interval, a time interval, and a corresponding water temperature setting value based on a cooling operation mode in an application scenario in which an office is a chiller. For example, when the actual ambient temperature Tao >30 ℃ (the external ambient temperature is in a high state), 8:00-10: in the time interval of 00, the water temperature set value of the water chilling unit is 12 ℃; in the following 10:00-12: in the time interval of 00, the water temperature set value of the water chilling unit is 10 ℃; at 12:00-14: in the time interval of 00, the water temperature set value of the water chilling unit is 8 ℃; at 14:00-17: in the time interval of 00, the water temperature set value of the water chilling unit is changed to 10 ℃. 8 in the morning: 00-10:00 is typically when the temperature is relatively low during the day, so the water temperature set point of 12 c is highest relative to other time periods during the day; 12:00-14:00 is typically the hottest time of day (e.g., in the summer), and thus the water temperature set point of 8 c is the lowest relative to the other time periods of the day to be able to meet the user's cooling needs. When 30 ℃ C. or more is greater than or equal to the actual ambient temperature Tao >27 ℃ (the ambient temperature is in a higher state), in the morning 8:00-10: in the time interval of 00, the water temperature set value of the water chilling unit is 14 ℃. In the same time interval the water temperature set point is raised from 12 to 14 c compared to the above-mentioned situation where the ambient temperature Tao >30 c. When 27 ℃ C. or more is greater than or equal to the actual ambient temperature Tao >24 ℃ (the ambient temperature is in a low state), in the morning 8:00-10: in the time interval of 00, the water temperature set value of the water chilling unit is 16 ℃. Compared with the situation that the temperature is more than or equal to 30 ℃ and more than or equal to the actual ambient temperature Tao is more than 27 ℃, the set value of the water temperature is increased from 14 ℃ to 16 ℃ in the same time interval. When 24 ℃ is equal to or higher than the actual ambient temperature Tao (the ambient temperature is in a low state), 8:00-10: in the time interval of 00, the water temperature set value of the water chilling unit is 18 ℃. Compared with the situation that the temperature is 27 ℃ or more and the actual ambient temperature Tao is more than 24 ℃, the set value of the water temperature is increased from 16 ℃ to 18 ℃ in the same time interval. As shown in table 2, the setting method of the water temperature set value in the different ambient temperature intervals for each of the other time intervals is the same as that of the time interval 8:00-10:00, namely, in the refrigeration running mode, in the same time interval, the set value of the refrigeration water temperature is reduced along with the rise of the environment temperature corresponding to the refrigeration environment temperature interval.
TABLE 2
In the heating operation mode (e.g., operation in winter), the ambient temperature is divided into a plurality of heating ambient temperature zones. Optionally, the plurality of heating environment temperature intervals includes four heating environment temperature intervals. The four heating environment temperature intervals can also be defined by three environment temperature interval end values: a first ambient temperature interval end Ts1, a second ambient temperature interval end Ts2, and a third ambient temperature interval end Ts3, wherein Ts1> Ts2> Ts 3. The four heating environment temperature intervals are as follows: the actual environment temperature Tao is greater than the first environment temperature interval end value Ts1, the first environment temperature interval end value Ts1 is greater than or equal to the actual environment temperature Tao and greater than the second environment temperature interval end value Ts2, the second environment temperature interval end value Ts2 is greater than or equal to the actual environment temperature Tao and greater than or equal to the third environment temperature interval end value Ts3, and the third environment temperature interval end value Ts3 is greater than or equal to the actual environment temperature Tao. In one or more embodiments, in the heating mode of operation, the first ambient temperature interval end Ts1, the second ambient temperature interval end Ts2, and the third ambient temperature interval end Ts3 may be, in order, 5 ℃, -5 ℃, and-10 ℃. In other embodiments, the ends of the temperature intervals may be adjusted higher or lower according to actual needs. Alternatively, the four heating ambient temperature intervals may also be defined by four ambient temperature interval end values: a first ambient temperature interval end Ts1, a second ambient temperature interval end Ts2, a third ambient temperature interval end Ts3, and a fourth ambient temperature interval end Ts 4. Correspondingly, the four heating environment temperature intervals are: the actual environment temperature Tao is greater than a first environment temperature interval end value Ts1, the first environment temperature interval end value Ts1 is greater than or equal to the actual environment temperature Tao and greater than a second environment temperature interval end value Ts2, the second environment temperature interval end value Ts2 is greater than or equal to the actual environment temperature Tao and greater than a third environment temperature interval end value Ts3, and the third environment temperature interval end value Ts3 is greater than or equal to the actual environment temperature Tao and greater than a fourth environment temperature interval end value Ts4, wherein Ts1 is greater than Ts2 and greater than Ts3 is greater than Ts 4. Alternatively, the heating environment temperature interval may also include more than four or less than four temperature intervals according to actual needs, and accordingly, the end values of the environment temperature interval may also be more or less.
Table 3 below provides an example of setting an ambient temperature interval, a time interval, and a corresponding water temperature setting value based on a heating operation mode in an application scenario in which an office is a chiller. For example, when the actual ambient temperature Tao >5 ℃ (the ambient temperature is high (i.e., not cold)), 8:00-10: in the time interval of 00, the water temperature set value of the water chilling unit is 48 ℃; in the following 10:00-12: in the time interval of 00, the water temperature set value of the water chilling unit is 43 ℃; at 12:00-14: in the time interval of 00, the water temperature set value of the water chilling unit is 38 ℃; at 14:00-17: in the time interval of 00, the water temperature set value of the water chilling unit is changed to 43 ℃. 8 in the morning: 00-10:00 is typically the time of day when the temperature is relatively low, so the water temperature set point of 48 ℃ is highest relative to other time periods in the day; 12:00-14:00 is typically the warmest time of day (e.g., in the winter), and thus the water temperature set point of 38 c is the lowest relative to other time periods of the day to be able to meet the heating needs of the user. When 5 ℃ is equal to or higher than the actual ambient temperature Tao > -5 ℃ (the ambient temperature is in a higher state), 8:00-10: in the time interval of 00, the water temperature set value of the water chilling unit is 51 ℃. In comparison to the above-mentioned situation where the actual ambient temperature Tao >5 deg.c, the water temperature set point is raised from 48 deg.c to 51 deg.c during the same time interval. When the actual ambient temperature Tao > 10 ℃ is higher than or equal to-5 ℃ (the ambient temperature is in a lower state), 8:00-10: in the time interval of 00, the water temperature set value of the water chilling unit is 53 ℃. Compared with the situation that the temperature is more than or equal to 5 ℃ and more than or equal to the actual ambient temperature Tao < -5 ℃, the set water temperature is increased from 51 ℃ to 53 ℃ in the same time interval. When the-10 ℃ is not less than the actual ambient temperature Tao (the ambient temperature is low), 8:00-10: in the time interval of 00, the water temperature set value of the water chilling unit is 55 ℃. Compared with the situation that the temperature is more than or equal to-5 ℃ and more than or equal to the actual ambient temperature Tao > -10 ℃, the set water temperature is increased from 53 ℃ to 55 ℃ again in the same time interval. As shown in table 3, the setting method of the water temperature set value in the different ambient temperature intervals for each of the other time intervals is the same as that for the time interval 8:00-10:00, that is, in the heating operation mode, the heating water temperature set value is decreased as the ambient temperature corresponding to the heating ambient temperature zone is increased in the same time zone.
TABLE 3
In one or more embodiments, the time of day can be divided first into on-time (typically the time required to run the chiller, such as coinciding with office hours in an office building) and off-time (typically the time not required to run the chiller, such as nighttime). The work hours may be, for example, from 8 am to 5 or 6 pm. In one or more embodiments, as shown in tables 2 and 3 above, the operating time may be divided into four time intervals: 8:00-10:00, 10:00-12:00, 12:00-14:00, and 14:00-17: 00. alternatively, the time of day may be divided into more or fewer different time intervals, depending on the actual needs. Alternatively, during non-operational hours, the chiller may operate based on a preset water temperature set point or a manually set water temperature set point.
Fig. 2 is a flowchart of an embodiment of the control method for automatically adjusting the set water temperature of the chiller according to the present invention. In this embodiment, the chiller has preset the ambient temperature intervals, the time intervals, and the set water temperature values corresponding to each of the ambient temperature intervals and each of the time intervals. As shown in fig. 2, in this embodiment, the control method for automatically adjusting the set water temperature of the chiller starts with step S5, i.e., the actual ambient temperature Tao and the actual time Tt are measured. Then, the actual ambient temperature Tao is compared with the first ambient temperature interval end Ts1 (step S6). If the actual ambient temperature Tao is greater than the first ambient temperature interval end Ts1, which means that the actual ambient temperature Tao is within the ambient temperature interval where the actual ambient temperature Tao > the first ambient temperature interval end Ts1, the control method then proceeds to step S7, where it is determined that the actual time Tt is within the time interval. Based on the determined ambient temperature interval and time interval, the control method automatically selects the corresponding water temperature set point (step S8). When the actual ambient temperature Tao is less than or equal to the first ambient temperature interval end Ts1, the control method proceeds to step S9 to determine whether the actual ambient temperature Tao is greater than the second ambient temperature interval end Ts 2. If the actual ambient temperature Tao is greater than the end value Ts2 of the second ambient temperature interval, which means that the actual ambient temperature Tao falls within the ambient temperature interval with the end value Ts1 of the first ambient temperature interval being greater than or equal to the actual ambient temperature Tao > the end value Ts2 of the second ambient temperature interval, the control method proceeds to step S10, i.e., determines the time interval in which the actual time Tt is located. Based on the determined ambient temperature interval and time interval, the control method automatically selects the corresponding water temperature set point (step S11). When the actual ambient temperature Tao is less than or equal to the second ambient temperature interval end Ts2, the control method proceeds to step S12 to determine whether the actual ambient temperature Tao is greater than the third ambient temperature interval end Ts 3. If the actual ambient temperature Tao is greater than the third ambient temperature interval end Ts3, it means that the actual ambient temperature Tao falls within the ambient temperature interval with the second ambient temperature interval end Ts2 being greater than or equal to the actual ambient temperature Tao > the third ambient temperature interval end Ts3, and the control method proceeds to step S13, i.e., determines the time interval in which the actual time Tt is located. Based on the determined ambient temperature interval and time interval, the control method automatically selects the corresponding water temperature set point (step S14). When the actual ambient temperature Tao is less than or equal to the third ambient temperature interval end Ts3, the control method proceeds to step S15 to determine whether the actual ambient temperature Tao is greater than the fourth ambient temperature interval end Ts 4. If the actual ambient temperature Tao is greater than the fourth ambient temperature interval end Ts4, it means that the actual ambient temperature Tao falls within the ambient temperature interval with the third ambient temperature interval end Ts3 being greater than or equal to the actual ambient temperature Tao > the fourth ambient temperature interval end Ts4, and the control method proceeds to step S16, i.e., determines the time interval in which the actual time Tt is located. Based on the determined ambient temperature interval and time interval, the control method automatically selects the corresponding water temperature set point (step S17). When the actual environment temperature Tao is less than or equal to the fourth environment temperature interval end value Ts4, the actual environment temperature Tao does not fall within the preset environment temperature interval of the chiller (that is, the actual environment temperature Tao is less than or equal to the fourth environment temperature interval end value Ts4 does not belong to the preset environment temperature interval of the chiller), the control method proceeds to step S18, and in step S18, the chiller can work based on the manually set water temperature set value.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (10)
1. A control method for automatically adjusting a set water temperature of a chiller, the control method comprising:
dividing the environment temperature into a plurality of environment temperature intervals, dividing one day into a plurality of time intervals, and setting a corresponding water temperature set value for each time interval in each environment temperature interval;
measuring actual ambient temperature and actual time;
selecting an ambient temperature interval, within the plurality of ambient temperature intervals, in which the measured actual ambient temperature falls, and selecting a time interval, within the plurality of time intervals, in which the measured actual time falls; and is
And based on the selected environment temperature interval and the time interval, the water chilling unit automatically selects the corresponding water temperature set value.
2. The control method for automatically adjusting a set water temperature of a water chilling unit according to claim 1, wherein the plurality of ambient temperature zones includes four ambient temperature zones.
3. The control method for automatically adjusting a set water temperature of a water chilling unit according to claim 1 or 2, wherein the water chilling unit has a cooling operation mode and a heating operation mode, and the control method includes: setting a plurality of refrigeration environment temperature intervals and corresponding refrigeration water temperature set values for the refrigeration operation mode; and setting a plurality of heating environment temperature intervals and a plurality of heating water temperature set values for the heating operation mode.
4. The control method for automatically adjusting the set water temperature of a water chilling unit according to claim 3, wherein in the cooling operation mode, the set value of the cooling water temperature is decreased as the ambient temperature corresponding to the cooling ambient temperature interval is increased in the same time interval.
5. The control method for automatically adjusting the set water temperature of a water chilling unit according to claim 3, wherein in the heating operation mode, the heating water temperature set value is decreased as the ambient temperature corresponding to the heating ambient temperature interval is increased in the same time interval.
6. The control method for automatically adjusting the set water temperature of a chiller according to claim 3 wherein said plurality of refrigeration ambient temperature intervals comprises: the actual environmental temperature is more than 30 ℃, 30 ℃ is more than or equal to the actual environmental temperature of more than 27 ℃, 27 ℃ is more than or equal to the actual environmental temperature of more than 24 ℃, and 24 ℃ is more than or equal to the actual environmental temperature.
7. The control method for automatically adjusting a set water temperature of a water chilling unit according to claim 3, wherein the plurality of heating environment temperature intervals include: the actual ambient temperature is more than 5 ℃, 5 ℃ is more than or equal to the actual ambient temperature > -10 ℃, and-10 ℃ is more than or equal to the actual ambient temperature.
8. A control method for automatically adjusting a set water temperature of a chiller as set forth in claim 1 or 2, wherein the chiller employs a manually set water temperature set point when the measured actual ambient temperature does not fall within any one of the ambient temperature intervals.
9. The control method for automatically adjusting a set water temperature of a water chilling unit according to claim 1 or 2, wherein the one day is divided into an operating time and a non-operating time, and the plurality of time intervals are divided into: 8:00-10:00, 10:00-12:00, 12:00-14:00, and 14:00-17: 00.
10. The control method for automatically adjusting a set water temperature of a chiller according to claim 9, wherein during said non-operating time said chiller is operable based on a preset water temperature set point or a manually set water temperature set point.
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| CN201911379477.4A CN113048611A (en) | 2019-12-27 | 2019-12-27 | Control method for automatically adjusting set water temperature of water chilling unit |
| PCT/CN2020/128727 WO2021129224A1 (en) | 2019-12-27 | 2020-11-13 | Control method for automatically adjusting set water temperature of water cooling unit |
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| CN201911379477.4A CN113048611A (en) | 2019-12-27 | 2019-12-27 | Control method for automatically adjusting set water temperature of water chilling unit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114046571A (en) * | 2021-09-27 | 2022-02-15 | 浙江中广电器股份有限公司 | Cold and hot water machine, processor thereof and operation control method |
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| WO2021129224A1 (en) | 2021-07-01 |
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