CN109237712B - Water temperature control method for multi-module unit - Google Patents
Water temperature control method for multi-module unit Download PDFInfo
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- CN109237712B CN109237712B CN201811113275.0A CN201811113275A CN109237712B CN 109237712 B CN109237712 B CN 109237712B CN 201811113275 A CN201811113275 A CN 201811113275A CN 109237712 B CN109237712 B CN 109237712B
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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
- F24F11/62—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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
Abstract
The invention relates to a water temperature control method for a multi-module unit, which is used for controlling the load of a compressor so as to reduce the energy consumption of the whole unit. According to the water temperature control method of the multi-module unit, the water outlet temperature value T0 of the heat exchanger, the water outlet temperature deviation value delta T1 and delta T2, delta T2 is larger than delta T1, and the number N of modules of the main board detection unit is set. After the unit is stably operated, detecting the actual outlet water temperature value Tx of the heat exchanger within the continuous time x, respectively comparing Tx with T0, Tx with (T0 +. DELTA.T 1) and Tx with (T0 +. DELTA.T 2), and adjusting the opening sizes of the electronic expansion valves of the N modules according to the comparison result. Through the regulation, when the actual (inlet) outlet water temperature of the heat exchanger is close to the set (inlet) outlet water temperature, the compressor runs under the appropriate load, so that the unit is effectively prevented from being started and stopped frequently, the actual outlet water temperature is effectively maintained to be stable, the energy consumption of the average single-module compressor is effectively reduced, and the energy consumption of the whole unit is reduced.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a water temperature control method for a multi-module unit.
Background
When the multi-module cold (hot) water unit is structurally designed, a plurality of independent refrigerant systems share one large shell and tube heat exchanger in the design scheme. And simultaneously, the temperature of inlet and outlet water detected by the water inlet and outlet temperature sensing bulb at the same position is shared to control the start and stop of each module compressor and the load of the compressor. This method is not favorable for energy-saving operation of the unit. Meanwhile, when the actual (inlet) outlet water temperature is close to the set (inlet) outlet water temperature, if a certain module of compressor is started, the water temperature is reduced to be lower than the set temperature after the compressor is started, so that the problem that the compressor is frequently started and stopped is caused.
Disclosure of Invention
The invention aims to provide a multi-module unit water temperature control method which can effectively avoid frequent start and stop of a unit, maintain stable actual water outlet temperature and effectively reduce energy consumption of an average single-module compressor, and aims to solve the problems that the unit is frequently started and stopped due to large load, fast cooling and short time for entering a standby state of the existing multi-module unit, the actual water outlet temperature is unstable and fluctuates due to load change of a compressor, and the average single-module compressor has large energy consumption.
A water temperature control method for a multi-module unit comprises the following steps:
setting an outlet water temperature value T0 and outlet water temperature deviation values delta T1 and delta T2 of the heat exchanger, wherein delta T2 is greater than delta T1;
detecting the number N of the unit modules;
after the unit operates stably, detecting the actual outlet water temperature value Tx of the heat exchanger within continuous time x;
and respectively comparing Tx with T0, Tx with (T0 +. DELTA.T 1) and Tx with (T0 +. DELTA.T 2), and adjusting the opening of the electronic expansion valve in the unit module according to the comparison result.
In one embodiment, the step of comparing Tx to T0, Tx to (T0 +. DELTA.T 1), and Tx to (T0 +. DELTA.T 2), respectively, and adjusting the opening of the electronic expansion valves in the assembly modules according to the comparison result includes:
if Tx > (T0 +. DELTA.T 2), the opening of the electronic expansion valves in all the modules is kept unchanged.
In one embodiment, the step of comparing Tx to T0, Tx to (T0 +. DELTA.T 1), and Tx to (T0 +. DELTA.T 2), respectively, and adjusting the opening of the electronic expansion valve of the unit module according to the comparison result further includes:
if T0 is less than Tx and less than Tx (T0 +. DELTA.T 1), the opening of the electronic expansion valves in all the modules is kept unchanged.
In one embodiment, the step of comparing Tx to T0, Tx to (T0 +. DELTA.T 1), and Tx to (T0 +. DELTA.T 2), respectively, and adjusting the opening of the electronic expansion valves in the assembly modules according to the comparison further includes:
if (T0 +. DELTA.T 1) < Tx ≦ (T0 +. DELTA.T 2), detecting N1 modules with the largest compressor load in all modules, wherein N1 is greater than or equal to 1 and less than N, and adjusting the opening degree of the electronic expansion valve in the N1 modules to be reduced.
In one embodiment, the step of adjusting the opening reduction of the electronic expansion valves in the N1 modules comprises:
before the opening degrees of the N1 module electronic expansion valves are adjusted, the opening degree of the N1 module electronic expansion valves is obtained as F1;
and adjusting the opening degree reduction value of the electronic expansion valve in the N1 modules to be delta F1, wherein delta F1 is F1/(K multiplied by N), and K is more than 1.
In one embodiment, K is 5.
In one embodiment, after the unit operates stably, the step of detecting the actual outlet water temperature value Tx of the heat exchanger within the continuous time x includes:
detecting the actual outlet water temperature value of the heat exchanger once every time t, wherein the continuous time x is more than or equal to mxt, m is more than or equal to 1, and the detected actual outlet water temperature value Tx of the heat exchanger in the continuous time x comprises m detection results Tx1 and Tx2 … Txm;
only if Tx1 and Tx2 … Txm are both greater than (T0+ DeltaT 2), the opening degree of the electronic expansion valves in all the modules is kept unchanged;
alternatively, the first and second electrodes may be,
only if Tx1 and Tx2 … Txm are both larger than T0, and Tx1 and Tx2 … Txm are both smaller than or equal to T0 plus delta T1, the opening of the electronic expansion valves in all the modules is kept unchanged;
alternatively, the first and second electrodes may be,
and detecting N1 modules with the largest compressor load in all the modules, wherein N1 is more than or equal to 1, and adjusting the opening degree of the electronic expansion valves in the N1 modules to be reduced only if Tx1 and Tx2 … Txm are both more than (T0+ Δ T1) and Tx1 and Tx2 … Txm are both less than or equal to (T0+ Δ T2).
In one embodiment, the method further comprises the following steps:
after the opening degree of the electronic expansion valves in the N1 modules is adjusted to be reduced, detecting the actual effluent temperature value Ty1 of the heat exchanger within the continuous time y for the 1 st time under the stable operation state of the unit;
respectively comparing Ty1 with T0, Ty1 with (T0+ delta T1), and adjusting the opening degree of an electronic expansion valve in the unit module according to the comparison result;
if (T0 +. DELTA.T 1) < Ty1 ≦ T0 +. DELTA.T 2, detecting the modules with the compressor load exceeding 50% in all the modules and selecting M1 modules with the largest compressor load from the modules, wherein M1 is greater than or equal to 1 and less than N, and adjusting the opening degree of the electronic expansion valve in the M1 modules to be reduced;
after the opening degree of the electronic expansion valves in the M1 modules is adjusted to be reduced, the running time t1 of the unit for the 2 nd time is adjusted, and the actual effluent temperature value Ty2 of the heat exchanger in the continuous time y is detected for the 2 nd time;
comparing Ty2 with T0, Ty2 with (T0+ DeltaT 1) respectively, if (T0+ DeltaT 1) < Ty2 is less than or equal to (T0+ DeltaT 2), detecting modules with the compressor load exceeding 50% in all modules, selecting M2 modules with the largest compressor load from the modules, wherein the M2 is more than or equal to 1 and less than N, and adjusting the opening degree of an electronic expansion valve in the M2 modules to be reduced;
……
after the opening degree of the electronic expansion valve of the module M (q-1) is adjusted to be reduced, the unit operation time t1 of the q time is adjusted, the actual effluent temperature value Tyq of the heat exchanger in the continuous time y of the q time is detected, and q is more than or equal to 3;
comparing Tyq with T0, Tyq with (T0+ DeltaT 1) respectively, if (T0+ DeltaT 1) < Tyq < (T0+ DeltaT 2), detecting the module with the compressor load exceeding 50% in all the modules and selecting Mq modules with the maximum compressor load from the modules, wherein Mq is more than or equal to 1 and less than N, and adjusting the opening degree of the electronic expansion valve in the Mq modules to be reduced.
In one embodiment, comparing Tyq with T0 and Tyq with (T0 +. DELTA.T 1), the step of adjusting the opening size of the electronic expansion valve in the crew module comprises:
and if T0 is more than or equal to Tyq (T0+ delta T1) and q is more than or equal to 1, keeping the opening sizes of the electronic expansion valves in all the modules unchanged.
In one embodiment, the step of adjusting the opening reduction of the electronic expansion valve in the Mq modules comprises:
under the stable operation state of the unit, acquiring the opening degree of an electronic expansion valve in the Mq modules as Pq;
and adjusting the opening degree reduction value of the electronic expansion valves in the Mq modules to be delta Pq, wherein the delta Pq is Pq/(a multiplied by N), and a is larger than 1.
In one embodiment, a is 10.
The invention has the beneficial effects that:
the water temperature control method of the multi-module unit comprises the steps of setting a water outlet temperature value T0 of a heat exchanger, a water outlet temperature deviation value delta T1 and delta T2, delta T2 > delta T1, detecting the number N of unit modules by a main board, detecting an actual water outlet temperature value Tx of the heat exchanger within continuous time T after the unit operates stably, comparing Tx with (T0+ delta T2), adjusting the opening of an electronic expansion valve in the unit modules according to a comparison structure, and adjusting the load of compressors of the N modules. Through the regulation, when the actual (inlet) outlet water temperature of the heat exchanger is close to the set (inlet) outlet water temperature, the compressor operates under a proper load, namely the actual outlet water temperature T0 is more than Tx and less than or equal to T0+ Delta T1, so that the frequent start and stop of the unit are effectively avoided, the actual outlet water temperature is effectively maintained to be stable, the energy consumption of the average single-module compressor is effectively reduced, and the energy consumption of the whole unit is reduced.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention.
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic flow chart of a water temperature control method for a multi-module unit of a multi-module unit according to an embodiment of the invention;
fig. 2 is a schematic diagram of a multi-module unit system according to an embodiment of the present invention.
Description of reference numerals:
heat exchanger 100
The inlet pipe 110
Water outlet pipe 120
Refrigerant channel 200
Electromagnetic expansion valve 210
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. The following description of the embodiments is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. In contrast, when an element is referred to as being "directly connected" to another element, there are no intervening elements present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
In the description of the present invention, it is to be understood that the terms "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner and are not to be construed as limiting the present invention.
Referring to fig. 1 and 2, a method for controlling water temperature of a multi-module unit includes the following steps:
and setting the outlet water temperature value T0 of the heat exchanger and outlet water temperature deviation values delta T1 and delta T2, wherein delta T2 is greater than delta T1. T0 is the temperature of the inlet and outlet water set by the user, different inlet and outlet water temperatures can be set by the user according to different cold requirement, the machine set controls the loading and unloading, the adjustment of the electronic expansion valve, the control of the refrigerant quantity and the like according to the temperature set value of the inlet and outlet water, so that the actual temperature of the inlet and outlet water reaches the set temperature of the inlet and outlet water, and the cold requirement of the user is met. The delta T2 is the deviation value of the water outlet temperature, the magnitude of the deviation value is the set temperature difference/N of the inlet water and the outlet water, and the set temperature difference of the inlet water and the outlet water is a value which can be set by a user. Δ T1 may be a settable value, alternatively Δ T1 ═ 1 ℃.
The number of the modules of the mainboard detection unit is N.
And after the unit operates stably, for example, the unit operates for about 20min, the actual outlet water temperature value Tx of the heat exchanger in the continuous time x is detected.
Comparing Tx with T0, Tx with (T0 +. DELTA.T 1) and Tx with (T0 +. DELTA.T 2) respectively, and adjusting the opening degree of the electronic expansion valves of the N modules according to the comparison result. The increase or decrease of the circulating refrigerant quantity of the system is controlled by adjusting the opening or closing of the electronic expansion valve. When the load of the compressor is large, the more the refrigerant quantity is, the higher the pressure is, the higher the current is, the faster the water temperature is reduced, and the main board reduces the load of the compressor according to the control logic. When the amount of refrigerant is small, the pressure is low, the current is small, the water temperature is slowly reduced, and the load of the compressor is increased by the main board. Both are to maintain the output capacity of the compressor to a degree that is compatible with various conditions. After the load of the compressor is adjusted, the pressure and the temperature of refrigerant in the large shell-and-tube heat exchanger are kept at a relatively proper level compared with the water temperature, and if the difference between the temperature of the refrigerant and the water temperature is constant, the refrigerant quantity is larger, the cold quantity absorbed by the water from the refrigerant is larger, namely the heat exchange quantity of the heat exchanger is increased; otherwise, the same principle is applied.
Alternatively, if Tx > (T0 +. DELTA.T 2), the opening sizes of the electronic expansion valves in all the N modules are kept unchanged. At this time, the difference between the actual leaving water temperature Tx and the set target leaving water temperature T0 is still large, so the compressor in each module needs to output energy continuously according to the current load, and the opening of the electronic expansion valve does not need to be adjusted, that is, the circulating refrigerant quantity of the refrigerant system does not need to be changed.
Alternatively, if T0 < Tx ≦ (T0 +. DELTA.T 1), the opening size of the electronic expansion valves in all N modules remains unchanged. At the moment, the output capacity of the compressor in each module is kept at a degree matched with various conditions, energy needs to be continuously output according to the current load, the opening size of the electronic expansion valve does not need to be adjusted, and the circulating refrigerant quantity of a refrigerant system does not need to be changed.
Optionally, if (T0 +. DELTA.T 1) < Tx ≦ (T0 +. DELTA.T 2), the actual leaving water temperature Tx is already close to the leaving water temperature set value T0, so the output load of the unit needs to be reduced to avoid that the unit is in standby when the leaving water temperature reaches the set leaving water temperature due to too fast water temperature reduction, and the unit is restarted after the user outputs energy. Specifically, the main board detects a module N1 with the largest compressor load among the N modules, wherein N1 is more than or equal to 1 and less than N. The load of the compressor of the unit is calculated through the current of the compressor, the current of the compressor is measured through a current detection board in the electric cabinet, the load of the compressor is visually displayed on the manual operator, communication is carried out between the manual operator and the main board, and through the measures, the main board can respectively detect the load of the compressor of a specific module. Obviously, N1 may be one module or a plurality of modules with the same load, and the opening degree of the electronic expansion valve of the module N1 is adjusted to be reduced. Optionally, before the opening degree of the module N1 electronic expansion valve is adjusted, the opening degree of the module N1 electronic expansion valve is F1. And adjusting the opening degree of the electronic expansion valve of the module N1 to be reduced, wherein the opening degree reduction value is delta F1, delta F1 is F1/(K multiplied by N), and K is more than 1. By reducing the opening degree of the valve by delta F1 (F1/(K multiplied by N)), the circulating cooling capacity in a refrigerant system is reduced, the load of a compressor is reduced, and the phenomenon that the water temperature is quickly reduced to the water inlet and outlet temperature T0 set by a user to cause the short time for the unit to enter a standby state and cause the unit to be frequently started and stopped is avoided. Optionally, K-5. The electronic expansion valve consists of a motor, a valve needle and other components, wherein the valve needle advances for a certain distance when the motor rotates for one circle, the electronic expansion valve advances one step at the moment, and the step of closing is the number of action circles of the motor. The opening F1 is turned off to be 1/5N based on the prior opening. At this time, the module with the largest load of the middle compressor is preferentially adjusted, because the low-load operation is more energy-saving compared with the high-load operation of the compressor, and when the load of the compressor needs to be reduced in the whole system, the load of the compressor in the high-load operation is selected to be reduced, so that the whole system is more energy-saving.
As shown in fig. 2, when the unit operates in a cooling or heating mode, water enters the large shell-and-tube heat exchanger 200 from the water inlet pipe 110 to exchange heat with the multiple modules of refrigerant one by one, and then is provided to customers from the water outlet pipe 120 after being exchanged from the left water chamber. When the unit is operated, the water temperature during each module heat transfer is different, therefore each module compressor load should be different in theory, thereby this patent passes through the mainboard and detects module number, thereby each module of control gets into heat exchanger 200 refrigerant volume and control each module load, reaches energy-conserving effect.
With continued reference to fig. 1, in one embodiment, after the unit operates stably, the step of detecting the actual outlet water temperature value Tx of the heat exchanger within the continuous time x includes:
detecting the actual outlet water temperature value of the heat exchanger once every time t, wherein the continuous time x is more than or equal to mxt, m is more than or equal to 1, and the actual outlet water temperature value Tx of the heat exchanger detected in the continuous time x comprises m detection results Tx1 and Tx2 … Txm;
only if Tx1 and Tx2 … Txm are both greater than (T0+ DeltaT 2), the opening degree of the electronic expansion valves in all the N modules is kept unchanged;
alternatively, the first and second electrodes may be,
only if Tx1 and Tx2 … Txm are both larger than T0, and Tx1 and Tx2 … Txm are both smaller than or equal to T0 plus delta T1, the opening of the electronic expansion valves in all the N modules is kept unchanged;
alternatively, the first and second electrodes may be,
and detecting N1 modules with the largest compressor load in all N modules, wherein N1 is more than or equal to 1, and adjusting the opening degree of the electronic expansion valves in the N1 modules to be reduced only if Tx1 and Tx2 … Txm are both larger than (T0+ Δ T1) and Tx1 and Tx2 … Txm are both smaller than or equal to (T0+ Δ T2). In this embodiment, optionally, t is 3s, m is 20, and x is 1 min.
With continued reference to fig. 1, in one embodiment, the method further comprises the following steps:
after the opening degree of the module N1 electronic expansion valve is adjusted to be reduced, in a stable operation state of the unit, in the stable operation state of the unit in this embodiment, the opening degree of the module N1 electronic expansion valve may be reduced, and the unit may operate for 10 min. Detecting the actual outlet water temperature value Ty1 of the heat exchanger in the continuous time y for the 1 st time;
respectively comparing Ty1 with T0, Ty1 with (T0+ delta T1), and adjusting the opening degree of the electronic expansion valves of the N unit modules according to the comparison result;
if (T0 +. DELTA.T 1) < Ty1 ≦ T0 +. DELTA.T 2, detecting the module with the compressor load exceeding 50% in all the N modules and selecting the module M1 with the maximum compressor load from the modules, wherein 1 is equal to or more than M1 < N, and adjusting the opening degree of the electronic expansion valve in the M1 modules to be reduced;
after the opening degree of the electronic expansion valves in the M1 modules is adjusted to be reduced, the running time t1 of the unit for the 2 nd time is adjusted, and the actual effluent temperature value Ty2 of the heat exchanger in the continuous time y is detected for the 2 nd time;
comparing Ty2 with T0, Ty2 with (T0+ DeltaT 1) respectively, if (T0+ DeltaT 1) < Ty2 ≦ T0+ DeltaT 2, detecting modules with the compressor load exceeding 50% in all N modules and selecting M2 modules with the maximum compressor load from the modules, wherein 1 is greater than or equal to M2 and less than N, and adjusting the opening degree of an electronic expansion valve in the M2 modules to be reduced;
……
after the opening degree of the electronic expansion valve of the module M (q-1) is adjusted to be reduced, the unit operation time t1 of the q time is adjusted, the actual effluent temperature value Tyq of the heat exchanger in the continuous time y of the q time is detected, and q is more than or equal to 3;
comparing Tyq with T0, Tyq with (T0+ DeltaT 1) respectively, if (T0+ DeltaT 1) < Tyq < (T0+ DeltaT 2), detecting the module with the compressor load exceeding 50% in all the N modules and selecting Mq modules with the maximum compressor load from the modules, wherein Mq is more than or equal to 1 and less than N, and adjusting the opening degree of the electronic expansion valve in the Mq modules to be reduced.
Alternatively, if T0 is less than Tyq and less than or equal to (T0+ delta T1) and q is more than or equal to 1, keeping the opening sizes of all the N module electronic expansion valves unchanged.
The continuous time y is set by the user, and optionally, y is 3 min.
In one embodiment, the step of adjusting the opening reduction of the module Mq electronic expansion valve comprises:
if (T0 +. DELTA.T 1) < Tyq ≦ (T0 +. DELTA.T 2), detecting the module with the compressor load exceeding 50% in all the N modules and selecting Mq modules with the largest compressor load from the modules, wherein Mq is greater than or equal to 1 and less than N, and adjusting the opening degree of the electronic expansion valves in the Mq modules to be reduced. The step of adjusting the opening reduction of the electronic expansion valves of the Mq modules comprises:
after the (q-1) th unit runs for time t1, acquiring the opening of the Mq electronic expansion valve of the module as Pq;
and adjusting the opening degree reduction value of the electronic expansion valves in the Mq modules to be delta Pq, wherein the delta Pq is Pq/(a multiplied by N), and a is larger than 1.
In one embodiment, a is 10.
Specifically, after the opening degree of the electronic expansion valve of the module N1 is adjusted to be reduced, the actual effluent temperature value Ty1 of the heat exchanger in the continuous time y is detected for the 1 st time under the stable operation state of the unit. Comparing Ty1 with T0, Ty1 with (T0+ DeltaT 1), and adjusting the opening degree of the electronic expansion valves of the N modules according to the comparison result. And if the T0 is more than Ty1 and less than or equal to (T0+ delta T1), keeping the opening sizes of the electronic expansion valves of the N modules. If (T0 +. DELTA.T 1) < Ty1 ≦ T0 +. DELTA.T 2, detecting the module with the compressor load exceeding 50% in the N modules and selecting M1 modules with the largest compressor load from the N modules, wherein the M1 < N is greater than or equal to 1, and adjusting the opening degree of the electronic expansion valves of the M1 modules to be reduced. And after the opening degree of the module N1 electronic expansion valve is adjusted to be reduced before the unit is in a stable running state, the opening degree of the module M1 electronic expansion valve is P1. And adjusting the opening degree of the electronic expansion valve of the module M1 to be reduced by a value delta P1, wherein the value delta P1 is P1/(a multiplied by N), and a is more than 1. Optionally, the a-10. The opening of the electronic expansion valve of the module M1 is reduced by P1/(10 XN), the refrigerant quantity entering a refrigerant circulating system is reduced, the load of a compressor with the load higher than 50 percent is reduced, the compressor of the whole system is operated under low load, and the energy consumption of the whole system is reduced. And after the opening degree reduction value of the electronic expansion valve of the module M1 is adjusted to be delta P1 and the unit operates stably for the 2 nd time, detecting the actual outlet water temperature value Ty2 of the heat exchanger within the continuous time y for the 2 nd time. Comparing Ty2 with T0, Ty2 with (T0+ DeltaT 1), and adjusting the opening degree of the electronic expansion valves of the N modules according to the comparison result. And if the T0 is more than Ty2 and less than or equal to (T0+ delta T1), keeping the opening sizes of the electronic expansion valves of the N modules. If (T0 +. DELTA.T 1) < Ty2 ≦ T0 +. DELTA.T 2, detecting the module with the compressor load exceeding 50% in the N modules and selecting the module M2 with the largest compressor load from the N modules, wherein 1 is equal to or less than M3 < N, and adjusting the opening degree of the electronic expansion valve of the module M1 to be reduced. And after the module is arranged in a stable running state of the unit, the opening of the electronic expansion valve of the module M2 is P2. And adjusting the opening degree of the electronic expansion valve of the module M2 to be reduced by a value delta P2, wherein the value delta P2 is P2/(a multiplied by N), and a is more than 1. And after the opening degree of the electronic expansion valve of the module M2 is adjusted to be reduced to be delta P2, after the (q-1) th unit operates stably, q is more than or equal to 3, and the actual outlet water temperature value Tyq of the heat exchanger in the continuous time y is detected for the q-th time. Tyq is compared with T0, Tyq is compared with (T0+ DeltaT 1), and the opening degree of the electronic expansion valves of the N modules is adjusted according to the comparison result. Repeated judgment is carried out, the load of the compressor is reduced to a load value matched with various conditions of the whole system, the condition matched with the ideal value is that T0 is more than Ty1 and less than or equal to (T0 plus delta T1), the opening size of the N module electronic expansion valves is kept to continuously operate, when the multi-module unit is operated in a refrigerating (heating) mode, the circulating refrigerant quantity in the refrigerant channel 200 is adjusted by controlling the opening size of the electronic expansion valves 210, the load of the compressor is further adjusted, the heat exchange quantity of the large shell-tube heat exchanger 200 is further adjusted, and therefore the multi-module unit is operated at a lower load, and the energy-saving effect is achieved.
Optionally, with continued reference to fig. 1, in one embodiment, after the unit is stably operated, the step of detecting an actual effluent temperature value Tyq of the heat exchanger within the qth unit continuous time t1 includes:
detecting the actual outlet water temperature value of the heat exchanger once every time t2, wherein the continuous time t1 is more than or equal to m multiplied by t2, m is more than or equal to 1, and the actual outlet water temperature value Tyq of the heat exchanger detected in the continuous time t1 comprises m detection results Ty1 and Ty2 … Tym;
and the opening degrees of the N module electronic expansion valves are kept unchanged only if Ty1 and Ty2 … Tym are both larger than T0, and Ty1 and Ty2 … Tym are both smaller than or equal to T0 plus delta T1).
Alternatively, the first and second electrodes may be,
and only if Ty1 and Ty2 … Tym are both larger than (T0+ delta T1) and Ty1 and Ty2 … Tym are both smaller than or equal to (T0+ delta T2), detecting the modules with the compressor load exceeding 50% in the N modules, selecting the modules Mq with the maximum compressor load from the modules, wherein Mq is more than or equal to 1 and less than N, and adjusting the opening degree of the electronic expansion valve of the modules Mq to be reduced.
Alternatively, t2 ═ 3s, m ═ 20, and t1 ═ 1 min.
The water temperature control method of the multi-module unit comprises the steps of setting a water outlet temperature value T0 of a heat exchanger, a water outlet temperature deviation value delta T1 and delta T2, delta T2 > delta T1, detecting the number N of unit modules by a main board, detecting an actual water outlet temperature value Tx of the heat exchanger within continuous time T after the unit operates stably, comparing Tx with (T0+ delta T2), adjusting the opening of an electronic expansion valve in the unit modules according to a comparison structure, and adjusting the load of compressors of the N modules. Through the regulation, when the actual (inlet) outlet water temperature of the heat exchanger is close to the set (inlet) outlet water temperature, the compressor operates under a proper load, namely the actual outlet water temperature T0 is more than Tx and less than or equal to T0+ Delta T1, so that the frequent start and stop of the unit are effectively avoided, the actual outlet water temperature is effectively maintained to be stable, the energy consumption of the average single-module compressor is effectively reduced, and the energy consumption of the whole unit is reduced.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (8)
1. A water temperature control method for a multi-module unit is characterized by comprising the following steps:
setting an outlet water temperature value T0 and outlet water temperature deviation values delta T1 and delta T2 of the heat exchanger, wherein delta T2 is greater than delta T1;
detecting the number N of the unit modules;
after the unit operates stably, detecting the actual outlet water temperature value Tx of the heat exchanger within continuous time x;
respectively comparing Tx with T0, Tx with (T0 +. DELTA.T 1) and Tx with (T0 +. DELTA.T 2), and adjusting the opening of an electronic expansion valve in the unit module according to the comparison result;
if Tx > (T0 +. DELTA.T 2) or T0 < Tx ≦ (T0 +. DELTA.T 1), the opening sizes of the electronic expansion valves in all the modules are kept unchanged;
if (T0 +. DELTA.T 1) < Tx ≦ (T0 +. DELTA.T 2), detecting N1 modules with the largest compressor load in all modules, wherein N1 is greater than or equal to 1 and less than N, and adjusting the opening degree of the electronic expansion valve in the N1 modules to be reduced.
2. The multi-module unit water temperature control method according to claim 1, wherein the step of adjusting the opening reduction of the electronic expansion valves in the N1 modules comprises:
before the opening degrees of the N1 module electronic expansion valves are adjusted, the opening degree of the N1 module electronic expansion valves is obtained as F1;
and adjusting the opening degree reduction value of the electronic expansion valve in the N1 modules to be delta F1, wherein delta F1 is F1/(K multiplied by N), and K is more than 1.
3. The multi-module unit water temperature control method according to claim 2, wherein K is 5.
4. The method for controlling the water temperature of the multi-module unit according to claim 1, wherein the step of detecting the actual outlet water temperature value Tx of the heat exchanger in the continuous time x after the unit is stably operated comprises the following steps:
detecting the actual outlet water temperature value of the heat exchanger once every time t, wherein the continuous time x is more than or equal to mxt, m is more than or equal to 1, and the detected actual outlet water temperature value Tx of the heat exchanger in the continuous time x comprises m detection results Tx1 and Tx2 … Txm;
only if Tx1 and Tx2 … Txm are both greater than (T0+ DeltaT 2), the opening degree of the electronic expansion valves in all the modules is kept unchanged;
alternatively, the first and second electrodes may be,
only if Tx1 and Tx2 … Txm are both larger than T0, and Tx1 and Tx2 … Txm are both smaller than or equal to T0 plus delta T1, the opening of the electronic expansion valves in all the modules is kept unchanged;
alternatively, the first and second electrodes may be,
and detecting N1 modules with the largest compressor load in all the modules, wherein N1 is more than or equal to 1, and adjusting the opening degree of the electronic expansion valves in the N1 modules to be reduced only if Tx1 and Tx2 … Txm are both more than (T0+ Δ T1) and Tx1 and Tx2 … Txm are both less than or equal to (T0+ Δ T2).
5. The water temperature control method for the multi-module unit as claimed in claim 1, further comprising the steps of:
after the opening degree of the electronic expansion valves in the N1 modules is adjusted to be reduced, detecting the actual effluent temperature value Ty1 of the heat exchanger within the continuous time y for the 1 st time under the stable operation state of the unit;
respectively comparing Ty1 with T0, Ty1 with (T0+ delta T1), and adjusting the opening degree of an electronic expansion valve in the unit module according to the comparison result;
if (T0 +. DELTA.T 1) < Ty1 ≦ T0 +. DELTA.T 2, detecting the modules with the compressor load exceeding 50% in all the modules and selecting M1 modules with the largest compressor load from the modules, wherein M1 is greater than or equal to 1 and less than N, and adjusting the opening degree of the electronic expansion valve in the M1 modules to be reduced;
after the opening degree of the electronic expansion valves in the M1 modules is adjusted to be reduced, the running time t1 of the unit for the 2 nd time is adjusted, and the actual effluent temperature value Ty2 of the heat exchanger in the continuous time y is detected for the 2 nd time;
comparing Ty2 with T0, Ty2 with (T0+ DeltaT 1) respectively, if (T0+ DeltaT 1) < Ty2 is less than or equal to (T0+ DeltaT 2), detecting modules with the compressor load exceeding 50% in all modules, selecting M2 modules with the largest compressor load from the modules, wherein the M2 is more than or equal to 1 and less than N, and adjusting the opening degree of an electronic expansion valve in the M2 modules to be reduced;
……
after the opening degree of the electronic expansion valve of the module M (q-1) is adjusted to be reduced, the unit operation time t1 of the q time is adjusted, the actual effluent temperature value Tyq of the heat exchanger in the continuous time y of the q time is detected, and q is more than or equal to 3;
comparing Tyq with T0, Tyq with (T0+ DeltaT 1) respectively, if (T0+ DeltaT 1) < Tyq < (T0+ DeltaT 2), detecting the module with the compressor load exceeding 50% in all the modules and selecting Mq modules with the maximum compressor load from the modules, wherein Mq is more than or equal to 1 and less than N, and adjusting the opening degree of the electronic expansion valve in the Mq modules to be reduced.
6. The multi-module unit water temperature control method of claim 5, wherein the comparing Tyq with T0 and Tyq with (T0+ DeltaT 1), the adjusting the opening size of the electronic expansion valves in the unit modules comprises:
and if T0 is more than or equal to Tyq (T0+ delta T1) and q is more than or equal to 1, keeping the opening sizes of the electronic expansion valves in all the modules unchanged.
7. The multi-module unit water temperature control method according to claim 6, wherein the step of adjusting the reduction of the opening degree of the electronic expansion valve in the Mq modules comprises:
under the stable operation state of the unit, acquiring the opening degree of an electronic expansion valve in the Mq modules as Pq;
and adjusting the opening degree reduction value of the electronic expansion valves in the Mq modules to be delta Pq, wherein the delta Pq is Pq/(a multiplied by N), and a is larger than 1.
8. The multi-module unit water temperature control method according to claim 7, wherein a is 10.
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| CN115981389B (en) * | 2022-12-09 | 2024-01-12 | 江苏拓米洛高端装备股份有限公司 | Control method and device of temperature regulating system and environment test box |
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