CN105202834A - Multi-connected air conditioning unit system and defrosting control method thereof - Google Patents
Multi-connected air conditioning unit system and defrosting control method thereof Download PDFInfo
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- CN105202834A CN105202834A CN201510570458.5A CN201510570458A CN105202834A CN 105202834 A CN105202834 A CN 105202834A CN 201510570458 A CN201510570458 A CN 201510570458A CN 105202834 A CN105202834 A CN 105202834A
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Abstract
The invention discloses a defrosting control method of a multi-connected air conditioning unit system and the multi-connected air conditioning unit system adopting the defrosting control method. The defrosting control method comprises following steps: the outdoor environment temperature is detected, and the temperature of a left heat exchanger and the temperature of a right heat exchanger are detected; when the multi-connected air conditioning unit system is in a defrosting mode, an absolute value of the temperature difference between the temperature of the right heat exchanger and the outdoor environment temperature is acquired, and the starting time of the right heat exchanger in first preset time before the multi-connected air conditioning unit system is in the defrosting mode is acquired; the absolute value of the temperature difference and the starting time of the right heat exchanger are judged; if the absolute value of the temperature difference is smaller than or equal to a first temperature threshold and the starting time of the right heat exchanger is shorter than or equal to a first time threshold, only the left heat exchanger is controlled to execute defrosting actions until the multi-connected air conditioning unit system finishes defrosting. With the adoption of the method, the condition that the right heat exchanger free of frost executes the defrosting actions is avoided, the energy loss is reduced, the purpose of rapid defrosting can be achieved, and the heating capacity in a heating period is improved.
Description
Technical field
The present invention relates to air-conditioning technical field, particularly a kind of defrosting control method of multiple on-line system and a kind of multiple on-line system.
Background technology
Along with the development of air-conditioning technical and the enhancing of people's environmental consciousness, recovery type heat multiple on-line system is more and more by the welcome in market, refrigeration can be realized due to recovery type heat multiple on-line system simultaneously and heat, and there is higher Energy Efficiency Ratio in a hybrid mode, therefore, recovery type heat multiple on-line system is one of product given priority to future.
Two-pipe recovery type heat multiple on-line system by off-premises station, part flow arrangement and indoor set three part form, for the sub-load feature of off-premises station complexity, off-premises station comprises left heat exchanger and right heat exchanger.For avoiding fan blade in left and right heat exchanger to produce noise because of resonance, the wind wheel in left and right heat exchanger arranges three fan blades and four fan blades respectively, and when motor speed is identical, the air quantity of right heat exchanger is relatively high, and therefore heat transfer intensity is higher.When multiple on-line system enters defrost pattern, usually first control right heat exchanger defrosting, then control left heat exchanger and carry out defrost, and when the frosting degree of multiple on-line system is relatively less, wastes causing and reduce the heating capacity in the cycle of heating.
Summary of the invention
Object of the present invention is intended at least solve one of above-mentioned technical problem.
For this reason, one object of the present invention is the defrosting control method proposing a kind of multiple on-line system, right heat exchanger can be avoided frostless and the situation of defrost, decrease energy loss.
Another object of the present invention is to propose a kind of multiple on-line system.
For achieving the above object, the embodiment of one aspect of the present invention proposes a kind of defrosting control method of multiple on-line system, described multiple on-line system comprises off-premises station device, part flow arrangement and multiple indoor unit, described off-premises station device comprises compressor, left heat exchanger and right heat exchanger, described defrosting control method comprises the following steps: detect outdoor environment temperature, and detect the temperature of described left heat exchanger and the temperature of described right heat exchanger; After described multiple on-line system enters defrost pattern, obtain the temperature difference absolute value between the temperature of described right heat exchanger and described outdoor environment temperature, and obtain the opening time that described multiple on-line system enters described right heat exchanger in the first Preset Time before described defrost pattern; The opening time of described temperature difference absolute value and described right heat exchanger is judged; If described temperature difference absolute value is less than or equal to the first temperature threshold and the opening time of described right heat exchanger is less than or equal to described very first time threshold value, then only control described left heat exchanger and perform defrost action, until described multiple on-line system completes defrost.
According to the defrosting control method of the multiple on-line system of the embodiment of the present invention, after multiple on-line system enters defrost pattern, before entering defrost pattern according to the temperature difference absolute value between the temperature of right heat exchanger and outdoor environment temperature and multiple on-line system, in the first Preset Time, the opening time of right heat exchanger judges whether right heat exchanger performs defrost action, when temperature difference absolute value is less than or equal to the first temperature threshold and the opening time of right heat exchanger is less than or equal to very first time threshold value, only control left heat exchanger and perform defrost action until defrost completes, effectively prevent the frostless and situation of defrost of right heat exchanger, decrease energy loss, and the object of quick defrost can be reached, improve the heating capacity in the cycle of heating.
According to one embodiment of present invention, if the opening time that described temperature difference absolute value is greater than described first temperature threshold or described right heat exchanger is greater than described very first time threshold value, then first control described right heat exchanger and perform defrost action, control described left heat exchanger again and perform defrost action, until described multiple on-line system completes defrost.
According to one embodiment of present invention, time that PI controls is entered when reaching the second Preset Time when described compressor heating operation, any one during if described multiple on-line system also meets the following conditions, then control described multiple on-line system and enter described defrost pattern: the less temperature in the temperature of a, described left heat exchanger and the temperature of described right heat exchanger is less than the second temperature threshold and continues the second time threshold; B, after described multiple on-line system exits described defrost pattern, the cumulative time of described compressor heating operation reaches the 3rd time threshold; When less temperature in the temperature of c, described left heat exchanger and the temperature of described right heat exchanger is less than the 3rd temperature threshold, and the pressure at expulsion of described compressor is less than preset pressure and continues the 4th time threshold.
Wherein, when described multiple on-line system is run with main heating mode or pure heating mode, described compressor heating operation.
According to one embodiment of present invention, the heat transfer intensity of described right heat exchanger is better than the heat transfer intensity of described left heat exchanger.
For achieving the above object, the present invention's embodiment on the other hand proposes a kind of multiple on-line system, comprising: multiple indoor unit, part flow arrangement, off-premises station device, described off-premises station device comprises compressor, left heat exchanger and right heat exchanger, outdoor temperature sensor, for detecting outdoor environment temperature, first temperature sensor, for detecting the temperature of described left heat exchanger, second temperature sensor, for detecting the temperature of described right heat exchanger, control device, for obtaining the temperature difference absolute value between the temperature of described right heat exchanger and described outdoor environment temperature after described multiple on-line system enters defrost pattern, and obtain the opening time that described multiple on-line system enters described right heat exchanger in the first Preset Time before described defrost pattern, and the opening time of described temperature difference absolute value and described right heat exchanger is judged, wherein, if described temperature difference absolute value is less than or equal to the first temperature threshold and the opening time of described right heat exchanger is less than or equal to described very first time threshold value, described control device then only controls described left heat exchanger and performs defrost action, until described multiple on-line system completes defrost.
According to the multiple on-line system of the embodiment of the present invention, after multiple on-line system enters defrost pattern, before control device enters defrost pattern according to the temperature difference absolute value between the temperature of right heat exchanger and outdoor environment temperature and multiple on-line system, in the first Preset Time, the opening time of right heat exchanger judges whether right heat exchanger performs defrost action, when temperature difference absolute value is less than or equal to the first temperature threshold and the opening time of right heat exchanger is less than or equal to very first time threshold value, only control left heat exchanger and perform defrost action until defrost completes, effectively prevent the frostless and situation of defrost of right heat exchanger, decrease energy loss, and the object of quick defrost can be reached, improve the heating capacity in the cycle of heating.
According to one embodiment of present invention, if the opening time that described temperature difference absolute value is greater than described first temperature threshold or described right heat exchanger is greater than described very first time threshold value, described control device then first controls described right heat exchanger and performs defrost action, control described left heat exchanger again and perform defrost action, until described multiple on-line system completes defrost.
According to one embodiment of present invention, time that PI controls is entered when reaching the second Preset Time when described compressor heating operation, any one during if described multiple on-line system also meets the following conditions, described control device then controls described multiple on-line system and enters described defrost pattern: the less temperature in the temperature of a, described left heat exchanger and the temperature of described right heat exchanger is less than the second temperature threshold and continues the second time threshold; B, after described multiple on-line system exits described defrost pattern, the cumulative time of described compressor heating operation reaches the 3rd time threshold; When less temperature in the temperature of c, described left heat exchanger and the temperature of described right heat exchanger is less than the 3rd temperature threshold, and the pressure at expulsion of described compressor is less than preset pressure and continues the 4th time threshold.
Wherein, when described multiple on-line system is run with main heating mode or pure heating mode, described compressor heating operation.
According to one embodiment of present invention, the heat transfer intensity of described right heat exchanger is better than the heat transfer intensity of described left heat exchanger.
The aspect that the present invention adds and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present invention.
Accompanying drawing explanation
The present invention above-mentioned and/or additional aspect and advantage will become obvious and easy understand from the following description of the accompanying drawings of embodiments, wherein:
Fig. 1 is the flow chart of the defrosting control method of multiple on-line system according to the embodiment of the present invention;
Fig. 2 is the flow chart of the defrosting control method of multiple on-line system according to an embodiment of the invention;
Fig. 3 and Fig. 4 is the schematic diagram of multiple on-line system according to an embodiment of the invention.
Detailed description of the invention
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the present invention, and can not limitation of the present invention being interpreted as.
Defrosting control method and the multiple on-line system of the multiple on-line system proposed according to the embodiment of the present invention are described with reference to the accompanying drawings.
Fig. 1 is the flow chart of the defrosting control method of multiple on-line system according to the embodiment of the present invention.Wherein, as shown in Figure 3, multiple on-line system comprises off-premises station device, part flow arrangement and multiple indoor unit, and off-premises station device comprises compressor, left heat exchanger and right heat exchanger.
As shown in Figure 1, the defrosting control method of this multiple on-line system comprises the following steps:
S1, detects outdoor environment temperature, and detects the temperature of left heat exchanger and the temperature of right heat exchanger.Such as, the temperature T1 of left heat exchanger can be detected by the temperature sensor be arranged on left heat exchanger exit pipeline, detected the temperature T2 of right heat exchanger by the temperature sensor be arranged on right heat exchanger exit pipeline.
S2, after multiple on-line system enters defrost pattern, obtains the temperature difference absolute value between the temperature of right heat exchanger and outdoor environment temperature, and obtains the opening time that multiple on-line system enters right heat exchanger in the first Preset Time before defrost pattern.Wherein, the first Preset Time can be demarcated according to actual conditions, and such as the first Preset Time can be 4h.
S3, judged the opening time of temperature difference absolute value and right heat exchanger.
S4, if temperature difference absolute value is less than or equal to the first temperature threshold and the opening time of right heat exchanger is less than or equal to very first time threshold value, then only controls left heat exchanger and performs defrost action, until multiple on-line system completes defrost.Wherein, the first temperature threshold and very first time threshold value can be demarcated according to actual conditions, and such as, the first temperature threshold can be 5 DEG C, and very first time threshold value can 10min.
According to one embodiment of present invention, the heat transfer intensity of right heat exchanger is better than the heat transfer intensity of left heat exchanger.
Specifically, when multiple on-line system is when heating under sub-load, there will be the situation that right heat exchanger does not use, if its frostless but defrost in surface, the high-temperature exhaust air heat of compressor can be wasted, and extend the defrost time, cause the whole average heating capacity heated in the cycle to reduce.Therefore, in an embodiment of the present invention, after multiple on-line system enters defrost pattern, before entering defrost pattern by the temperature difference absolute value between the temperature of right heat exchanger and outdoor environment temperature and multiple on-line system, the opening time of the first Preset Time as heat exchanger right in 4h judges the whether frosting of right heat exchanger, when the non-frosting of right heat exchanger, only need to control left heat exchanger and perform defrost action until defrost completes.First control right heat exchanger with traditional employing and carry out defrost, control the method that left heat exchanger carries out defrost again to compare, not only avoid the frostless and situation of defrost of right heat exchanger, decrease energy loss, and realize quick defrost by the high-temperature exhaust air heat making full use of compressor, improve the heating capacity and heating energy efficiency ratio that heat in the cycle.
According to one embodiment of present invention, if the opening time that temperature difference absolute value is greater than the first temperature threshold or right heat exchanger is greater than very first time threshold value, then first control right heat exchanger and perform defrost action, then control left heat exchanger execution defrost action, until multiple on-line system completes defrost.
That is, after multiple on-line system enters defrost pattern, if judge right heat exchanger frosting, then need to control right heat exchanger and perform defrost action, and be better than the heat transfer intensity of left heat exchanger due to the heat transfer intensity of right heat exchanger, therefore first control right heat exchanger and perform defrost action, and when defrost acquires a certain degree, control left heat exchanger again and perform defrost action, to reach the object of quick defrost, and effectively prevent heat indoor set start capacity from large to small, right heat exchanger surface may have frostization and under bad working environments freeze situation.
Specifically, as shown in Figure 2, the defrost process of multiple on-line system comprises the following steps:
S101, multiple on-line system enters defrost pattern.
S102, judges | whether T2-T4| is less than or equal to 5 DEG C, and multiple on-line system enter defrost pattern before in 4h the opening time of right heat exchanger whether be less than or equal to 10min, wherein, T4 is outdoor environment temperature.If so, step S104 is performed; If not, step S103 is performed.
S103, controls right heat exchanger and performs defrost action.
S104, controls left heat exchanger and performs defrost action.
S105, defrost completes.
According to one embodiment of present invention, time that PI controls is entered when reaching the second Preset Time when compressor heating operation, any one during if multiple on-line system also meets the following conditions, then control multiple on-line system and enter defrost pattern: the less temperature in the temperature of a, left heat exchanger and the temperature of right heat exchanger is less than the second temperature threshold and lasting second time threshold; B, after multiple on-line system exits defrost pattern, the cumulative time of compressor heating operation reaches the 3rd time threshold; When less temperature in the temperature of c, left heat exchanger and the temperature of right heat exchanger is less than the 3rd temperature threshold, and the pressure at expulsion of compressor is less than preset pressure and continues the 4th time threshold.Wherein, second Preset Time, the second temperature threshold, the second time threshold, the 3rd time threshold, the 3rd temperature threshold, preset pressure and the 4th time threshold can be demarcated according to actual conditions, such as, second Preset Time can be 15min, second temperature threshold=-14 DEG C+coefficient * T4, wherein coefficient temperature range residing for outdoor environment temperature T4 is selected, second time threshold can be 5min, 3rd temperature threshold can be 0 DEG C, 4th time threshold can be 40min, and preset pressure can be 2MPa.
Wherein, when multiple on-line system is run with main heating mode or pure heating mode, compressor heating operation.It should be noted that, main heating mode is a kind of mixed mode, specifically refer to that in multiple indoor unit, existing refrigeration indoor set heats indoor set again, outdoor heat exchanger absorbs heat from environment as evaporimeter, and pure heating mode refers to that multiple indoor unit is all heat indoor set.
Specifically, for the multiple on-line system adopting PI to control, by judging that with under type multiple on-line system is the need of entering defrost pattern.
First judge whether compressor is heating operation according to the operational mode of multiple on-line system, such as, when multiple on-line system is run with main heating mode or pure heating mode, compressor is heating operation, then judge compressor enter PI control time whether reach 15min, enter the time that PI controls reach 15min when compressor heating operation, and meet one of following three conditions, then control multiple on-line system and enter defrost pattern.
(1) temperature of outdoor heat exchanger (left heat exchanger and right heat exchanger) is low, as min (T1, T2) < second temperature threshold and continue 5min.
(2) after multiple on-line system exits defrost pattern, the accumulated time of compressor heating operation meets certain condition, after multiple on-line system exits defrost pattern, can at min (T1, T2) timing is started during <-2 DEG C, until the cumulative time of compressor heating operation under different outdoor environment temperature reaches the 3rd time threshold.
(3) ice and snow seriously covers and causes high pressure ratio lower, as min (T1, T2) < 0 DEG C and the pressure at expulsion Pd < 2MPa of compressor continue 40min, wherein, the pressure at expulsion Pd of compressor can be obtained by the pressure sensor being arranged on exhaust outlet of compressor place.
Thus come accurately to control multiple on-line system by the way and whether enter defrost pattern, avoid whole multiple on-line system to occur the frostless and situation of defrost.
According to the defrosting control method of the multiple on-line system of the embodiment of the present invention, after multiple on-line system enters defrost pattern, before entering defrost pattern according to the temperature difference absolute value between the temperature of right heat exchanger and outdoor environment temperature and multiple on-line system, in the first Preset Time, the opening time of right heat exchanger judges whether right heat exchanger performs defrost action, when temperature difference absolute value is less than or equal to the first temperature threshold and the opening time of right heat exchanger is less than or equal to very first time threshold value, only control left heat exchanger and perform defrost action until defrost completes, effectively prevent the frostless and situation of defrost of right heat exchanger, decrease energy loss, and the object of quick defrost can be reached, improve the heating capacity in the cycle of heating.
Fig. 3 and Fig. 4 is the schematic diagram of multiple on-line system according to an embodiment of the invention.As shown in Figure 3 and Figure 4, this multiple on-line system comprises: off-premises station device 10, part flow arrangement 20, multiple indoor unit 30, outdoor temperature sensor (not specifically illustrating in figure), the first temperature sensor 40, second temperature sensor 50 and control device (not specifically illustrating in figure).
Wherein, as shown in Figure 3, off-premises station device 10 comprises compressor, left heat exchanger 110 and right heat exchanger 111.
Specifically, off-premises station device 10 can comprise multiple compressor such as two compressor 102a, 102b, compressor 102a is in parallel with compressor 102b, after the gas returning port of two compressors is connected, be connected with the first end of oil eliminator 106 with capillary 107b and filter 103b by capillary 107a in parallel successively, and, also be connected with one end of outer machine gas-liquid separator 101 by filter 103a after the gas returning port of two compressors is connected, the exhaust outlet of two compressors is connected respectively by after check valve 104a and check valve 104b, and be connected with the second end of oil eliminator 106.3rd end of oil eliminator 106 is connected with one end of outer machine gas-liquid separator 101 with after filter 103a by screen pack 103c, capillary 107c, magnetic valve 108a successively.
Cross valve 105 has first to fourth valve port, first valve port is connected with the 4th end of oil eliminator 106, second valve port is connected with the general export of part flow arrangement 20 by after check valve 104i and stop valve 109a successively, and the 3rd valve port is connected with the other end of outer machine gas-liquid separator 101.
The inlet ductwork of each heat exchange unit in left heat exchanger 110 is formed through shunting by same road pipeline, and be respectively arranged with magnetic valve 108b, magnetic valve 108c and magnetic valve 108d in the inlet ductwork of each heat exchange unit, the export pipeline of each heat exchange unit in left heat exchanger 110 is connected with one end of check valve 104g respectively by after check valve 104d, check valve 104e and check valve 104f.The inlet ductwork of each heat exchange unit in right heat exchanger 111 is all connected with magnetic valve 108h with the magnetic valve 108g of parallel connection, is connected after the export pipeline of each heat exchange unit in right heat exchanger 111 is connected with one end of check valve 104m.After the other end of check valve 104g is connected with the other end of check valve 104m, be connected with the general import of part flow arrangement 20 by stop valve 109b.Be connected with the 4th end of oil eliminator 106 by magnetic valve 108e after left heat exchanger 110 is connected with the anti-freezing pipeline of right heat exchanger 111, and be also provided with magnetic valve 108f between the 4th end and stop valve 109b of oil eliminator 106.
In addition, one end of check valve 104g is also connected with the 4th valve port of cross valve 105 by check valve 104j, and one end of check valve 104m is connected with the 4th valve port of cross valve 105 by check valve 104k.Check valve 104l is also provided with, between the 4th valve port and distribution pipeline 112 of cross valve and be respectively arranged with check valve 104c and check valve 104h between distribution pipeline 112 and stop valve 109a between second valve port and stop valve 109b of cross valve 105.
As shown in Figure 4, part flow arrangement 20 comprises multiple magnetic valve such as four that heats and heats magnetic valve 202a, 202b, 202c, 202d, multiple refrigeration magnetic valve is four refrigeration magnetic valves 201a, 201b, 201c, 201d such as, gas-liquid separator 204, first heat-exchanging component 205, second heat-exchanging component 206, first throttle assembly 207, second orifice union 208, multiplely heat one-way valve as four and heat check valve 209a, 209b, 209c, 209d and multiple refrigeration one-way valve as four refrigeration check valves 210a, 210b, 210c, 210d.Wherein, multiple magnetic valve 202a, 202b, 202c, 202d of heating is connected with the first end of multiple indoor unit 30 respectively with the joint of multiple refrigeration magnetic valve 201a, 201b, 201c, 201d, the outlet of multiple refrigeration magnetic valve 201a, 201b, 201c, 201d is together using the general export as part flow arrangement 20, and the general export of part flow arrangement 20 is connected with the first interface of off-premises station device 10.First port of gas-liquid separator 204 is connected with the second interface of off-premises station device 10, and the second port of gas-liquid separator 204 is connected with the first end of multiple indoor unit 30 respectively by multiple magnetic valve 202a, 202b, 202c, 202d of heating.Multiple check valve 209a, 209b, 209c, 209d of heating is connected with the second end of multiple indoor unit 30 respectively with the joint of multiple refrigeration check valve 210a, 210b, 210c, 210d.
In addition, first heat-exchanging component 205 and the second heat-exchanging component 206 have the first heat exchange stream and the second heat exchange stream respectively, 3rd port of gas-liquid separator 204 is connected with the first heat exchange stream of the first heat-exchanging component 205, first heat exchange stream of the first heat-exchanging component 205 is also connected with first throttle assembly 207, second heat exchange stream of the first heat-exchanging component 205 respectively with the second heat exchange stream and multiple refrigeration magnetic valve 201a of the second heat-exchanging component 206, 201b, 201c, 201d is connected, second heat exchange stream of the second heat-exchanging component 206 is also connected with the second orifice union 208, first heat exchange stream of the second heat-exchanging component 206 respectively with first throttle assembly 207, multiplely heat check valve 209a, 209b, 209c, 209d, second orifice union 208 and multiple refrigeration check valve 210a, 210b, 210c, 210d is connected, and first throttle assembly 207 is also parallel with magnetic valve 212a, second orifice union 208 is also parallel with magnetic valve 212b.
Each indoor unit in multiple indoor unit 30 includes indoor heat exchanger and restricting element, wherein, first indoor unit comprises indoor heat exchanger 311 and restricting element 312, second indoor unit comprises indoor heat exchanger 321 and restricting element 322,3rd indoor unit comprises indoor heat exchanger 331 and restricting element 332, and in fourth ventricle, machine comprises indoor heat exchanger 341 and restricting element 342.The first end of the indoor heat exchanger in each indoor unit is connected with the joint of the magnetic valve that freezes with the corresponding magnetic valve that heats, second end of the indoor heat exchanger in each indoor unit is first connected with restricting element, then is connected with the joint of multiple refrigeration check valve 210a, 210b, 210c, 210d with corresponding multiple check valve 209a, 209b, 209c, 209d of heating respectively.Restricting element 312,322,332,342 and first throttle assembly 207 and the second orifice union 208 can be electric expansion valve.
In an embodiment of the present invention, outdoor temperature sensor is for detecting outdoor environment temperature, and the first temperature sensor 40 is for detecting the temperature of left heat exchanger 110, and the second temperature sensor 50 is for detecting the temperature of right heat exchanger 111.Control device is used for the temperature difference absolute value obtained after multiple on-line system enters defrost pattern between the temperature of right heat exchanger 111 and outdoor environment temperature, and obtain the opening time that multiple on-line system enters right heat exchanger 111 in the first Preset Time before defrost pattern, and the opening time of temperature difference absolute value and right heat exchanger 111 is judged, wherein, if temperature difference absolute value is less than or equal to the first temperature threshold and the opening time of right heat exchanger 111 is less than or equal to very first time threshold value, control device then only controls left heat exchanger 110 and performs defrost action, until multiple on-line system completes defrost.Wherein, the first Preset Time can be 4h, and the first temperature threshold can be 5 DEG C, and very first time threshold value can 10min.
According to one embodiment of present invention, the heat transfer intensity of right heat exchanger 111 is better than the heat transfer intensity of left heat exchanger 110.
Specifically, when multiple on-line system is when heating under sub-load, there will be the situation that right heat exchanger 111 does not use, if its frostless but defrost in surface, the high-temperature exhaust air heat of compressor can be wasted, and extend the defrost time, cause the whole average heating capacity heated in the cycle to reduce.Therefore, in an embodiment of the present invention, after multiple on-line system enters defrost pattern, before entering defrost pattern by the temperature difference absolute value between the temperature of right heat exchanger 111 and outdoor environment temperature and multiple on-line system, the opening time of the first Preset Time as heat exchanger 111 right in 4h judges right heat exchanger 111 whether frosting, when right heat exchanger 111 non-frosting, only need to control left heat exchanger 110 and perform defrost action until defrost completes.First control right heat exchanger with traditional employing and carry out defrost, control the method that left heat exchanger carries out defrost again to compare, not only avoid the frostless and situation of defrost of right heat exchanger, decrease energy loss, and realize quick defrost by the high-temperature exhaust air heat making full use of compressor, improve the heating capacity and heating energy efficiency ratio that heat in the cycle.
According to one embodiment of present invention, if the opening time that temperature difference absolute value is greater than the first temperature threshold or right heat exchanger 111 is greater than very first time threshold value, control device then first controls right heat exchanger 111 and performs defrost action, control left heat exchanger 110 again and perform defrost action, until multiple on-line system completes defrost.
That is, after multiple on-line system enters defrost pattern, if judge the frosting of right heat exchanger 111, then need to control right heat exchanger 111 and perform defrost action, and be better than the heat transfer intensity of left heat exchanger 110 due to the heat transfer intensity of right heat exchanger 111, therefore first control right heat exchanger 111 and perform defrost action, and when defrost acquires a certain degree, control left heat exchanger 110 again and perform defrost action, to reach the object of quick defrost, and effectively prevent heat indoor set start capacity from large to small, the situation that right heat exchanger 111 surface may have frostization and freeze under bad working environments.
According to one embodiment of present invention, time that PI controls is entered when reaching the second Preset Time when compressor heating operation, any one during if multiple on-line system also meets the following conditions, control device then controls multiple on-line system and enters defrost pattern: the less temperature in the temperature of a, left heat exchanger 110 and the temperature of right heat exchanger 111 is less than the second temperature threshold and continues the second time threshold; B, after multiple on-line system exits defrost pattern, the cumulative time of compressor heating operation reaches the 3rd time threshold; When less temperature in the temperature of c, left heat exchanger 110 and the temperature of right heat exchanger 111 is less than the 3rd temperature threshold, and the pressure at expulsion of compressor is less than preset pressure and continues the 4th time threshold.Wherein, the pressure at expulsion of compressor can be detected by the pressure sensor 60 being arranged on compressor 102a and compressor 102b exhaust ports and obtain, second Preset Time can be 15min, second time threshold can be 5min, second temperature threshold=-14 DEG C+coefficient * T4, wherein coefficient temperature range residing for outdoor environment temperature T4 is selected, and the 3rd temperature threshold can be 0 DEG C, 4th time threshold can be 40min, and preset pressure can be 2MPa.
Wherein, when multiple on-line system is run with main heating mode or pure heating mode, compressor heating operation.It should be noted that, main heating mode is a kind of mixed mode, specifically refer to that in multiple indoor unit 30, existing refrigeration indoor set heats indoor set again, outdoor heat exchanger is used as evaporimeter and absorbs heat from environment, and pure heating mode refers to that multiple indoor unit 30 is all heat indoor set.
Specifically, for the multiple on-line system adopting PI to control, by judging that with under type multiple on-line system is the need of entering defrost pattern.
First judge whether compressor is heating operation according to the operational mode of multiple on-line system, such as, when multiple on-line system is run with main heating mode or pure heating mode, compressor is heating operation, then judge compressor enter PI control time whether reach 15min, enter the time that PI controls reach 15min when compressor heating operation, and meet one of following three conditions, then control multiple on-line system and enter defrost pattern.
(1) temperature of outdoor heat exchanger (left heat exchanger and right heat exchanger) is low, as min (T1, T2) < second temperature threshold and continue 5min, wherein, T1 is the temperature of the left heat exchanger 110 that the first temperature sensor 40 detects, and T2 is the temperature of the right heat exchanger 111 that the second temperature sensor 50 detects.
(2) after multiple on-line system exits defrost pattern, the accumulated time of compressor heating operation meets certain condition, after multiple on-line system exits defrost pattern, can at min (T1, T2) timing is started during <-2 DEG C, until the cumulative time of compressor heating operation under different outdoor environment temperature reaches the 3rd time threshold.
(3) ice and snow seriously covers and causes high pressure ratio lower, as min (T1, T2) < 0 DEG C and the pressure at expulsion Pd < 2MPa of compressor and continue 40min.
Thus come accurately to control multiple on-line system by the way and whether enter defrost pattern, avoid whole multiple on-line system to occur the frostless and situation of defrost.
According to the multiple on-line system of the embodiment of the present invention, after multiple on-line system enters defrost pattern, before control device enters defrost pattern according to the temperature difference absolute value between the temperature of right heat exchanger and outdoor environment temperature and multiple on-line system, in the first Preset Time, the opening time of right heat exchanger judges whether right heat exchanger performs defrost action, when temperature difference absolute value is less than or equal to the first temperature threshold and the opening time of right heat exchanger is less than or equal to very first time threshold value, only control left heat exchanger and perform defrost action until defrost completes, effectively prevent the frostless and situation of defrost of right heat exchanger, decrease energy loss, and the object of quick defrost can be reached, improve the heating capacity in the cycle of heating.
In the description of this description, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, identical embodiment or example are not necessarily referred to the schematic representation of above-mentioned term.And the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more embodiment or example.
Although illustrate and describe embodiments of the invention, for the ordinary skill in the art, be appreciated that and can carry out multiple change, amendment, replacement and modification to these embodiments without departing from the principles and spirit of the present invention, scope of the present invention is by claims and equivalency thereof.
Claims (10)
1. the defrosting control method of a multiple on-line system, it is characterized in that, described multiple on-line system comprises off-premises station device, part flow arrangement and multiple indoor unit, and described off-premises station device comprises compressor, left heat exchanger and right heat exchanger, and described defrosting control method comprises the following steps:
Detect outdoor environment temperature, and detect the temperature of described left heat exchanger and the temperature of described right heat exchanger;
After described multiple on-line system enters defrost pattern, obtain the temperature difference absolute value between the temperature of described right heat exchanger and described outdoor environment temperature, and obtain the opening time that described multiple on-line system enters described right heat exchanger in the first Preset Time before described defrost pattern;
The opening time of described temperature difference absolute value and described right heat exchanger is judged;
If described temperature difference absolute value is less than or equal to the first temperature threshold and the opening time of described right heat exchanger is less than or equal to described very first time threshold value, then only control described left heat exchanger and perform defrost action, until described multiple on-line system completes defrost.
2. the defrosting control method of multiple on-line system as claimed in claim 1, it is characterized in that, if the opening time that described temperature difference absolute value is greater than described first temperature threshold or described right heat exchanger is greater than described very first time threshold value, then first control described right heat exchanger and perform defrost action, control described left heat exchanger again and perform defrost action, until described multiple on-line system completes defrost.
3. the defrosting control method of multiple on-line system as claimed in claim 1 or 2, it is characterized in that, time that PI controls is entered when reaching the second Preset Time when described compressor heating operation, any one during if described multiple on-line system also meets the following conditions, then control described multiple on-line system and enter described defrost pattern:
Less temperature in the temperature of a, described left heat exchanger and the temperature of described right heat exchanger is less than the second temperature threshold and continues the second time threshold;
B, after described multiple on-line system exits described defrost pattern, the cumulative time of described compressor heating operation reaches the 3rd time threshold;
When less temperature in the temperature of c, described left heat exchanger and the temperature of described right heat exchanger is less than the 3rd temperature threshold, and the pressure at expulsion of described compressor is less than preset pressure and continues the 4th time threshold.
4. the defrosting control method of multiple on-line system as claimed in claim 3, is characterized in that, when described multiple on-line system is run with main heating mode or pure heating mode, and described compressor heating operation.
5. the defrosting control method of multiple on-line system as claimed in claim 1, it is characterized in that, the heat transfer intensity of described right heat exchanger is better than the heat transfer intensity of described left heat exchanger.
6. a multiple on-line system, is characterized in that, comprising:
Multiple indoor unit;
Part flow arrangement;
Off-premises station device, described off-premises station device comprises compressor, left heat exchanger and right heat exchanger;
Outdoor temperature sensor, for detecting outdoor environment temperature;
First temperature sensor, for detecting the temperature of described left heat exchanger;
Second temperature sensor, for detecting the temperature of described right heat exchanger;
Control device, for obtaining the temperature difference absolute value between the temperature of described right heat exchanger and described outdoor environment temperature after described multiple on-line system enters defrost pattern, and obtain the opening time that described multiple on-line system enters described right heat exchanger in the first Preset Time before described defrost pattern, and the opening time of described temperature difference absolute value and described right heat exchanger is judged, wherein
If described temperature difference absolute value is less than or equal to the first temperature threshold and the opening time of described right heat exchanger is less than or equal to described very first time threshold value, described control device then only controls described left heat exchanger and performs defrost action, until described multiple on-line system completes defrost.
7. multiple on-line system as claimed in claim 6, it is characterized in that, if the opening time that described temperature difference absolute value is greater than described first temperature threshold or described right heat exchanger is greater than described very first time threshold value, described control device then first controls described right heat exchanger and performs defrost action, control described left heat exchanger again and perform defrost action, until described multiple on-line system completes defrost.
8. multiple on-line system as claimed in claims 6 or 7, it is characterized in that, time that PI controls is entered when reaching the second Preset Time when described compressor heating operation, any one during if described multiple on-line system also meets the following conditions, described control device then controls described multiple on-line system and enters described defrost pattern:
Less temperature in the temperature of a, described left heat exchanger and the temperature of described right heat exchanger is less than the second temperature threshold and continues the second time threshold;
B, after described multiple on-line system exits described defrost pattern, the cumulative time of described compressor heating operation reaches the 3rd time threshold;
When less temperature in the temperature of c, described left heat exchanger and the temperature of described right heat exchanger is less than the 3rd temperature threshold, and the pressure at expulsion of described compressor is less than preset pressure and continues the 4th time threshold.
9. multiple on-line system as claimed in claim 8, is characterized in that, when described multiple on-line system is run with main heating mode or pure heating mode, and described compressor heating operation.
10. multiple on-line system as claimed in claim 6, it is characterized in that, the heat transfer intensity of described right heat exchanger is better than the heat transfer intensity of described left heat exchanger.
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| CN107917505A (en) * | 2017-11-07 | 2018-04-17 | 珠海格力电器股份有限公司 | A kind of multi-split air conditioner and its outdoor unit defrosting control method |
| CN108954677A (en) * | 2018-07-23 | 2018-12-07 | 广东美的暖通设备有限公司 | Defrosting control method, defrosting control system and the storage medium of multi-line system |
| CN109140725A (en) * | 2018-08-31 | 2019-01-04 | 广东美的暖通设备有限公司 | Multi-online air-conditioning system and its defrosting control method |
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| CN114279046A (en) * | 2021-12-31 | 2022-04-05 | 珠海格力电器股份有限公司 | Defrosting control method and controller suitable for modular multi-split air conditioning system and air conditioner |
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| CN115654661A (en) * | 2022-08-19 | 2023-01-31 | 珠海格力电器股份有限公司 | Air conditioner anti-freezing control method and air conditioner |
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