CN105115210A - Air cooled heat pump cold and hot water unit and defrosting control method thereof - Google Patents
Air cooled heat pump cold and hot water unit and defrosting control method thereof Download PDFInfo
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Abstract
The invention discloses an air cooled heat pump cold and hot water unit and a defrosting control method thereof. The method includes the following steps that the outdoor environment temperature T4 and the low-pressure side pressure of each compressor of each module machine are detected in real time; the pressure change rate delta P of the low-pressure side of each compressor is obtained according to the low-pressure side pressure which is detected in real time; when the air cooled heat pump cold and hot water unit enters a defrosting mode and when it is judged that the air cooled heat pump cold and hot water unit operates in a rotation defrosting mode according to T4, at least one module machine is controlled to be started, and at least one module machine is kept in a shutdown state; the started module machine is controlled to conduct alternative refrigerating operation with the module machine in the shutdown state according to the delta Pa corresponding to the started module machine and delta Pb corresponding to the module machine in the shutdown state, a draught fan is kept moving continuously, defrosting is conducted through forced convection heat transfer of the draught fan so that defrosting can be conducted through continuous operation of the draught fan due to switching of the module machines, the refrigerating effect of the unit is improved, and the user experience is improved.
Description
Technical field
The present invention relates to air-conditioning technical field, particularly a kind of defrosting control method of air-cooled heat pump water chiller-heater units and a kind of air-cooled heat pump water chiller-heater units.
Background technology
For air heat pump type air-conditioning, when heating operation, need to absorb heat from air, but the change of environment temperature, domestic hot water side heat exchanger frosting can be caused, air heat pump type air-conditioning heating ability and efficiency are declined.In order to avoid heating effect is deteriorated, air heat pump type air-conditioning can run defrost pattern and defrost, and defrost pattern can not heat, and finally has a great impact the heating effect of entirety.
In correlation technique, when air heat pump type air-conditioning is in defrost process, the commutation of compressor operating, cross valve, simultaneously blower fan shut down, air heat pump type air-conditioning switches to refrigerating operaton, carries out defrost, after frost all melts by high temperature refrigerant, exit defrost, then proceed to heat.It can thus be appreciated that defrost process is process of refrigerastion, can impact, thus affect complete machine capability, affect Consumer's Experience to water temperature.
Summary of the invention
The present invention is intended to solve one of technical problem in above-mentioned technology at least to a certain extent.For this reason, one object of the present invention is the defrosting control method proposing a kind of air-cooled heat pump water chiller-heater units, do not need to be converted to refrigerating operaton and blowing-out machine to carry out defrost, but carry out defrost by switching to utilize the continuation of blower fan own to run between control module machine, improve the heating effect of air-cooled heat pump water chiller-heater units, improve Consumer's Experience.
Another object of the present invention is to propose a kind of air-cooled heat pump water chiller-heater units.
For achieving the above object, one aspect of the present invention embodiment proposes a kind of defrosting control method of air-cooled heat pump water chiller-heater units, wherein, described air-cooled heat pump water chiller-heater units comprises N number of module machine, N be more than or equal to 2 integer, the outlet pipe of each described module machine is connected to total outlet pipe of described air-cooled heat pump water chiller-heater units respectively, the water inlet pipe of each described module machine is connected to the water inlet manifold of described air-cooled heat pump water chiller-heater units respectively, be connected in parallel to realize described N number of module machine, each described module machine comprises multiple water heating system, each described water heating system comprises compressor and air-condition heat exchanger, described defrosting control method comprises the following steps: detect outdoor environment temperature T4 in real time, and detect the low-pressure lateral pressure of each compressor in each described module machine in real time, the low-pressure lateral pressure rate of change △ P of each compressor is obtained according to the low-pressure lateral pressure of each compressor detected in real time, when described air-cooled heat pump water chiller-heater units enters defrost pattern, described outdoor environment temperature T4 is judged, if described outdoor environment temperature T4 is greater than the first preset temperature, then controls described air-cooled heat pump water chiller-heater units according to the low-pressure lateral pressure rate of change △ P of each compressor and run in rotation defrost mode.
According to one embodiment of present invention, when described air-cooled heat pump water chiller-heater units is run in rotation defrost mode, wherein, at least one module machine controlled in described N number of module machine is opened, and is kept at least one module machine in described N number of module machine to be in stopped status; And replace heating operation according to arbitrary module machine that the low-pressure lateral pressure rate of change △ Pa of each compressor corresponding to arbitrary module machine opened and the low-pressure lateral pressure rate of change △ Pb that is in each compressor corresponding to arbitrary module machine of stopped status controls this unlatching with the arbitrary module machine being in stopped status; and keep the blower fan in arbitrary module machine of this unlatching and the blower fan continuous service be in arbitrary module machine of stopped status, carry out defrost with the forced-convection heat transfer by blower fan.
According to the defrosting control method of the air-cooled heat pump water chiller-heater units of the embodiment of the present invention, real-time detection outdoor environment temperature T4, and detect the low-pressure lateral pressure of each compressor in each module machine in real time, then when the outdoor environment temperature T4 by detecting in real time judges that air-cooled heat pump water chiller-heater units is run in rotation defrost mode, at least one module machine controlled in N number of module machine is opened, and keep at least one module machine in N number of module machine to be in stopped status, then the arbitrary module machine controlling this unlatching according to the low-pressure lateral pressure rate of change △ Pa of each compressor corresponding to arbitrary module machine opened and the low-pressure lateral pressure rate of change △ Pb that is in each compressor corresponding to arbitrary module machine of stopped status replaces heating operation with the arbitrary module machine being in stopped status, and keep the blower fan in arbitrary module machine of this unlatching and the blower fan continuous service be in arbitrary module machine of stopped status, defrost is carried out with the forced-convection heat transfer by blower fan, thus without the need to being converted to refrigerating operaton and blowing-out machine to carry out defrost, reduce and heat decay when heating defrost, greatly improve the heating effect of air-cooled heat pump water chiller-heater units, improve Consumer's Experience.
According to one embodiment of present invention, the defrosting control method of described air-cooled heat pump water chiller-heater units also comprises: if described outdoor environment temperature T4 is less than or equal to described first preset temperature, then controls described air-cooled heat pump water chiller-heater units and run with conventional Defrost mode.
According to one embodiment of present invention, when arbitrary module machine of this unlatching is primary module machine, the arbitrary module machine being in stopped status be first from module machine time, arbitrary module machine that the low-pressure lateral pressure rate of change △ Pa of described each compressor corresponding to arbitrary module machine according to opening and the low-pressure lateral pressure rate of change △ Pb being in each compressor corresponding to arbitrary module machine of stopped status controls this unlatching replaces heating operation with the arbitrary module machine being in stopped status and specifically comprises: a, the compressor controlled in described primary module machine is started shooting to make described primary module machine heating operation, and after described primary module machine heating operation, obtain the accumulation heat pamp of described primary module machine, b, when the low-pressure lateral pressure rate of change △ Pa that the accumulation heat pamp of described primary module machine reaches arbitrary compressor in very first time threshold value or described primary module machine is more than or equal to the first preset value, control the compressor shutdown in described primary module machine, blower fan in described primary module machine continues to run, and control described first from the compressor start module machine to make described first from module machine heating operation, and after module machine heating operation, obtain described first from the accumulation heat pamp of module machine described first, c, when described first reaches the second time threshold or described first from the accumulation heat pamp of module machine the low-pressure lateral pressure rate of change △ Pb of arbitrary compressor is more than or equal to described first preset value from module machine, control described first from the compressor shutdown module machine, described first continues to run from the blower fan module machine, and returns execution step a.
According to one embodiment of present invention; arbitrary module machine that the low-pressure lateral pressure rate of change △ Pa of described each compressor corresponding to arbitrary module machine according to opening and the low-pressure lateral pressure rate of change △ Pb being in each compressor corresponding to arbitrary module machine of stopped status controls this unlatching replaces heating operation with the arbitrary module machine being in stopped status and specifically also comprises: when the accumulation heat pamp of described primary module machine does not reach described very first time threshold value and in described primary module machine, the low-pressure lateral pressure rate of change △ Pa of each compressor is all less than described first preset value, control described primary module machine and continue heating operation.
According to one embodiment of present invention; arbitrary module machine that the low-pressure lateral pressure rate of change △ Pa of described each compressor corresponding to arbitrary module machine according to opening and the low-pressure lateral pressure rate of change △ Pb being in each compressor corresponding to arbitrary module machine of stopped status controls this unlatching replaces heating operation with the arbitrary module machine being in stopped status and specifically also comprises: when described first from the accumulation heat pamp of module machine do not reach described second time threshold and described first from module machine, the low-pressure lateral pressure rate of change △ Pb of each compressor is all less than described first preset value time, control described first and continue heating operation from module machine.
For achieving the above object, a kind of air-cooled heat pump water chiller-heater units that the present invention's another aspect embodiment proposes, comprise: N number of module machine, the outlet pipe of each described module machine is connected to total outlet pipe of described air-cooled heat pump water chiller-heater units respectively, the water inlet pipe of each described module machine is connected to the water inlet manifold of described air-cooled heat pump water chiller-heater units respectively, be connected in parallel to realize described N number of module machine, wherein, each described module machine comprises multiple water heating system, each described water heating system comprises compressor and air-condition heat exchanger, N be more than or equal to 2 integer, first temperature detecting module, for detecting outdoor environment temperature T4 in real time, first pressure detecting module, for detecting the low-pressure lateral pressure of each compressor in each described module machine in real time, control module, for obtaining the low-pressure lateral pressure rate of change △ P of each compressor according to the low-pressure lateral pressure of each compressor detected in real time, and when described air-cooled heat pump water chiller-heater units enters defrost pattern, described outdoor environment temperature T4 is judged, wherein, if described outdoor environment temperature T4 is greater than the first preset temperature, described control module then controls described air-cooled heat pump water chiller-heater units according to the low-pressure lateral pressure rate of change △ P of each compressor and runs in rotation defrost mode.
According to one embodiment of present invention, when described air-cooled heat pump water chiller-heater units is run in rotation defrost mode, at least one module machine that described control module controls in described N number of module machine is opened, and keep at least one module machine in described N number of module machine to be in stopped status, and replace heating operation according to arbitrary module machine that the low-pressure lateral pressure rate of change △ Pa of each compressor corresponding to arbitrary module machine opened and the low-pressure lateral pressure rate of change △ Pb that is in each compressor corresponding to arbitrary module machine of stopped status controls this unlatching with the arbitrary module machine being in stopped status, and keep the blower fan in arbitrary module machine of this unlatching and the blower fan continuous service be in arbitrary module machine of stopped status, defrost is carried out with the forced-convection heat transfer by blower fan.
According to the air-cooled heat pump water chiller-heater units of the embodiment of the present invention, when running in rotation defrost mode, at least one module machine that control module controls in N number of module machine is opened, and keep at least one module machine in N number of module machine to be in stopped status, then the arbitrary module machine controlling this unlatching according to the low-pressure lateral pressure rate of change △ Pa of each compressor corresponding to arbitrary module machine opened and the low-pressure lateral pressure rate of change △ Pb that is in each compressor corresponding to arbitrary module machine of stopped status replaces heating operation with the arbitrary module machine being in stopped status, and keep the blower fan in arbitrary module machine of this unlatching and the blower fan continuous service be in arbitrary module machine of stopped status, defrost is carried out with the forced-convection heat transfer by blower fan, namely by the switching between module machine, the continuation of the blower fan of utilization own runs carries out defrost, thus without the need to carrying out defrost by conversion refrigerating operaton and blowing-out machine, reduce and heat decay when heating defrost, greatly improve heating effect, improve Consumer's Experience.
According to one embodiment of present invention, when described air-cooled heat pump water chiller-heater units enters defrost pattern, if described outdoor environment temperature T4 is less than or equal to described first preset temperature, described control module then controls described air-cooled heat pump water chiller-heater units and runs with conventional Defrost mode.
According to one embodiment of present invention, when arbitrary module machine that arbitrary module machine of this unlatching is primary module machine, be in stopped status be first from module machine time, described control module realizes controlling described primary module machine and described first by following control flow and replaces heating operation from module machine: a, the compressor controlled described primary module machine are started shooting to make described primary module machine heating operation, and obtain the accumulation heat pamp of described primary module machine after described primary module machine heating operation; B, when the low-pressure lateral pressure rate of change △ Pa that the accumulation heat pamp of described primary module machine reaches arbitrary compressor in very first time threshold value or described primary module machine is more than or equal to the first preset value, control the compressor shutdown in described primary module machine, blower fan in described primary module machine continues to run, and control described first from the compressor start module machine to make described first from module machine heating operation, and after module machine heating operation, obtain described first from the accumulation heat pamp of module machine described first; C, when described first reaches the second time threshold or described first from the accumulation heat pamp of module machine the low-pressure lateral pressure rate of change △ Pb of arbitrary compressor is more than or equal to described first preset value from module machine; control described first from the compressor shutdown module machine; described first continues to run from the blower fan module machine, and returns execution step a.
According to one embodiment of present invention, when the accumulation heat pamp of described primary module machine does not reach described very first time threshold value and in described primary module machine, the low-pressure lateral pressure rate of change △ Pa of each compressor is all less than described first preset value, described control module controls described primary module machine and continues heating operation.
According to one embodiment of present invention, when described first from the accumulation heat pamp of module machine do not reach described second time threshold and described first from module machine, the low-pressure lateral pressure rate of change △ Pb of each compressor is all less than described first preset value time, described control module controls described first and continues heating operation from module machine.
Accompanying drawing explanation
Fig. 1 is the block diagram of air-cooled heat pump water chiller-heater units according to an embodiment of the invention;
Fig. 2 is the system architecture schematic diagram of module machine according to an embodiment of the invention;
Fig. 3 is the flow chart of the defrosting control method of air-cooled heat pump water chiller-heater units according to the embodiment of the present invention; And
Fig. 4 is defrosting control flow chart when air-cooled heat pump water chiller-heater units is run in rotation defrost mode 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.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the present invention, and can not limitation of the present invention be interpreted as.
Defrosting control method and the air-cooled heat pump water chiller-heater units of the air-cooled heat pump water chiller-heater units proposed according to the embodiment of the present invention are described with reference to the accompanying drawings.
Shown in composition graphs 1 and Fig. 2, air-cooled heat pump water chiller-heater units comprises N number of module machine according to an embodiment of the invention, N be more than or equal to 2 integer, the outlet pipe of each module machine is connected to total outlet pipe of air-cooled heat pump water chiller-heater units respectively, the water inlet pipe of each module machine is connected to the water inlet manifold of air-cooled heat pump water chiller-heater units respectively, is connected in parallel to realize N number of module machine.And, as shown in Figure 2, each module machine can comprise multiple water heating system such as two (the first water heating system and the second water heating system), each water heating system comprises compressor and air-condition heat exchanger, wherein, air-condition heat exchanger in air-condition heat exchanger in each water heating system such as the first water heating system and the air-condition heat exchanger in the second water heating system share a blower fan, and share same water-side heat.
That is, each air-cooled heat pump cold-hot water machine all can form independently module machine, and each module machine shares same main water route, and the air-cooled heat pump water chiller-heater units that N number of module machine is formed provides cold and hot amount for interior machine.
As shown in Figure 3, the defrosting control method of this air-cooled heat pump water chiller-heater units comprises the following steps:
S1, detects outdoor environment temperature T4 in real time, and detects the low-pressure lateral pressure of each compressor in each module machine in real time.
Wherein, detect outdoor environment temperature T4 by outdoor temperature sensor, and detect low-pressure lateral pressure by the pressure sensor being arranged on each compressor return air mouth place.
S2, obtains the low-pressure lateral pressure rate of change △ P of each compressor according to the low-pressure lateral pressure of each compressor detected in real time.
Namely say, △ P is the back pressure rate of decay of each compressor.
S3, when air-cooled heat pump water chiller-heater units enters defrost pattern, judges outdoor environment temperature T4.
S4, if outdoor environment temperature T4 is greater than the first preset temperature, then controls air-cooled heat pump water chiller-heater units according to the low-pressure lateral pressure rate of change △ P of each compressor and runs in rotation defrost mode.
According to one embodiment of present invention, if outdoor environment temperature T4 is less than or equal to the first preset temperature, then controls air-cooled heat pump water chiller-heater units and run with conventional Defrost mode.
Wherein, it should be noted that, the first preset temperature can be demarcated according to the concrete condition of air-cooled heat pump water chiller-heater units.And, conventional Defrost mode refer to air-cooled heat pump water chiller-heater units still with normal refrigerating operaton and blowing-out machine to carry out defrost, namely say, when outdoor environment temperature T4 is lower, air-cooled heat pump water chiller-heater units still carries out defrost by normal refrigerating operaton and blowing-out machine.And air-cooled heat pump water chiller-heater units runs i.e. rotation defrost between module machine in rotation defrost mode, only for specific outdoor environment temperature.
In an embodiment of the present invention, when air-cooled heat pump water chiller-heater units is run in rotation defrost mode, at least one module machine controlled in N number of module machine is opened, and is kept at least one module machine in N number of module machine to be in stopped status; And replace heating operation according to arbitrary module machine that the low-pressure lateral pressure rate of change △ Pa of each compressor corresponding to arbitrary module machine opened and the low-pressure lateral pressure rate of change △ Pb that is in each compressor corresponding to arbitrary module machine of stopped status controls this unlatching with the arbitrary module machine being in stopped status; and keep the blower fan in arbitrary module machine of this unlatching and the blower fan continuous service be in arbitrary module machine of stopped status, carry out defrost with the forced-convection heat transfer by blower fan.
That is, when air-cooled heat pump water chiller-heater units is run in rotation defrost mode, first the one or more module machines in N number of module machine are opened, and need to ensure that at least one module machine is in stopped status, then the frosting situation of the module machine of unlatching is fed back according to the back pressure parameter of each compressor detected, completed shutdown and the rotation of compressor between module machine by the parameter of above-mentioned detection and the condition that presets simultaneously, wherein only stopped compressor by the module machine of rotation, not blowing-out machine, defrosted by the forced-convection heat transfer of blower fan, thus realize rotation defrost between module machine and module machine.
Therefore say, the defrosting control method of the air-cooled heat pump water chiller-heater units of the embodiment of the present invention, when control air-cooled heat pump water chiller-heater units is run in rotation defrost mode, without the need to changing refrigerating operaton and blowing-out machine to carry out defrost, but the switching between module machine, the continuation of the blower fan of utilization own runs carries out defrost, thus reduces and heat decay when heating defrost, greatly improve heating effect, improve Consumer's Experience.
According to one embodiment of present invention, when arbitrary module machine of this unlatching is primary module machine, the arbitrary module machine being in stopped status be first from module machine time, arbitrary module machine that the low-pressure lateral pressure rate of change △ Pa according to each compressor corresponding to arbitrary module machine opened in above-mentioned steps S5 and the low-pressure lateral pressure rate of change △ Pb being in each compressor corresponding to arbitrary module machine of stopped status controls this unlatching replaces heating operation with the arbitrary module machine being in stopped status and specifically comprises: a, the compressor controlled in primary module machine is started shooting to make primary module machine heating operation, and after primary module machine heating operation, obtain the accumulation heat pamp of primary module machine, b, when the low-pressure lateral pressure rate of change △ Pa that the accumulation heat pamp of primary module machine reaches arbitrary compressor in very first time threshold value or primary module machine is more than or equal to the first preset value, control the compressor shutdown in primary module machine, blower fan in primary module machine continues to run, and control first from the compressor start module machine to make first from module machine heating operation, and after module machine heating operation, obtain first from the accumulation heat pamp of module machine first, c, when first reaches the second time threshold or first from the accumulation heat pamp of module machine the low-pressure lateral pressure rate of change △ Pb of arbitrary compressor is more than or equal to the first preset value from module machine, control first from the compressor shutdown module machine, first continues to run from the blower fan module machine, and returns execution step a.
Particularly, as shown in Figure 4, defrosting control flow process when air-cooled heat pump water chiller-heater units is run in rotation defrost mode comprises the following steps:
S301, air-cooled heat pump water chiller-heater units is run with heating mode after receiving start-up command.
S302, the compressor controlled in primary module machine is opened to make primary module machine heating operation.
S303, primary module machine carries out frosting accumulation timing, and obtains accumulation heat pamp ta.
S304, judges whether the low-pressure lateral pressure rate of change △ Pa of arbitrary compressor in primary module machine is more than or equal to the first preset value Pv.If so, step S306 is performed; If not, step S305 is performed.Wherein, the first preset value Pv demarcates as the case may be.
S305, judges whether accumulation heat pamp ta reaches very first time threshold value.If so, then step S306 is performed; If not, then return step S303, namely say, when the accumulation heat pamp of described primary module machine does not reach described very first time threshold value and in described primary module machine, the low-pressure lateral pressure rate of change △ Pa of each compressor is all less than described first preset value, control described primary module machine and continue heating operation.Wherein, very first time threshold value can set according to actual conditions.
S306, controls the compressor shutdown in primary module machine, keeps the blower fan in primary module machine to continue to run, and controls first from the compressor unlatching module machine to make first from module machine heating operation.
S307, first carries out frosting accumulation timing from module machine, and obtains accumulation heat pamp tb.
S308, judge first from module machine the low-pressure lateral pressure rate of change △ Pb of arbitrary compressor whether be more than or equal to the first preset value Pv.If so, step S310 is performed; If not, step S309 is performed.
S309, judges whether accumulation heat pamp tb reaches the second time threshold.If so, then step S310 is performed; If not, then return step S307, namely say, when described first from the accumulation heat pamp of module machine do not reach described second time threshold and described first from module machine, the low-pressure lateral pressure rate of change △ Pb of each compressor is all less than described first preset value time, control described first from module machine continue heating operation.Wherein, the second time threshold can set according to actual conditions equally.
S310, controls first from the compressor shutdown module machine, keeps first to continue to run from the blower fan module machine, then returns and perform step S302.
It can thus be appreciated that, in an embodiment of the present invention, when controlling air-cooled heat pump water chiller-heater units and running in rotation defrost mode, switch in turn between module machine by controlling primary module machine and first, the heat that the continuation of the blower fan of utilization own runs and makes the frost on corresponding air-condition heat exchanger absorb surrounding environment carries out defrost, thus reduce and heat decay when heating defrost, greatly improve heating effect, improve Consumer's Experience.
Thus, when air-cooled heat pump water chiller-heater units adopts rotation defrost mode to run, realize carrying out defrost by the mode of not blowing-out machine, cross valve commutation is not related in defrost process, so there will not be intermittent refrigeration (refrigeration defrost) and cause the fluctuating temperature of air-cooled heat pump water chiller-heater units, the heating effect of air-cooled heat pump water chiller-heater units also there will not be decay simultaneously, improves Consumer's Experience.
According to the defrosting control method of the air-cooled heat pump water chiller-heater units of the embodiment of the present invention, real-time detection outdoor environment temperature T4, and detect the low-pressure lateral pressure of each compressor in each module machine in real time, then when the outdoor environment temperature T4 by detecting in real time judges that air-cooled heat pump water chiller-heater units is run in rotation defrost mode, at least one module machine controlled in N number of module machine is opened, and keep at least one module machine in N number of module machine to be in stopped status, then the arbitrary module machine controlling this unlatching according to the low-pressure lateral pressure rate of change △ Pa of each compressor corresponding to arbitrary module machine opened and the low-pressure lateral pressure rate of change △ Pb that is in each compressor corresponding to arbitrary module machine of stopped status replaces heating operation with the arbitrary module machine being in stopped status, and keep the blower fan in arbitrary module machine of this unlatching and the blower fan continuous service be in arbitrary module machine of stopped status, defrost is carried out with the forced-convection heat transfer by blower fan, thus without the need to being converted to refrigerating operaton and blowing-out machine to carry out defrost, reduce and heat decay when heating defrost, greatly improve the heating effect of air-cooled heat pump water chiller-heater units, improve Consumer's Experience.
In addition, a kind of air-cooled heat pump water chiller-heater units that the embodiment of the present invention also proposes comprises: N number of module machine 100, first temperature detecting module, the first pressure detecting module and control module, N be more than or equal to 2 integer.
Wherein, as shown in Figure 1, the outlet pipe of each module machine 100 is connected to total outlet pipe of air-cooled heat pump water chiller-heater units respectively, and the water inlet pipe of each module machine 100 is connected to the water inlet manifold of air-cooled heat pump water chiller-heater units respectively, is connected in parallel to realize N number of module machine 100.
And, as shown in Figure 2, each module machine 100 can comprise multiple water heating system such as two (the first water heating system and the second water heating system), each water heating system comprises compressor and air-condition heat exchanger wherein, air-condition heat exchanger in air-condition heat exchanger in each water heating system such as the first water heating system and the air-condition heat exchanger in the second water heating system share a blower fan, and share same water-side heat.
Specifically, as shown in Figure 2, first water heating system comprises compressor 11, delivery temperature switch 12, high-voltage switch gear 13, cross valve 14, low tension switch 15, low pressure fills with the 16, first air-condition heat exchanger 17, electric expansion valve 18, second water heating system comprises compressor 21, delivery temperature switch 22, high-voltage switch gear 23, cross valve 24, low tension switch 25, low pressure fill with the 26, second air-condition heat exchanger 27, electric expansion valve 28.And, first air-condition heat exchanger 17 and the second air-condition heat exchanger 27 share a blower fan 10, first water heating system and the second water heating system also share water-side heat and double-tube heat exchanger 20, simultaneously, double-tube heat exchanger 20 the equal set temperature sensor of water outlet pipe part and water inlet pipe place (such as water inlet pipe place set temperature sensor 101 with detect water inlet water temperature), in water outlet pipe part, flow sensor is set, and between air-condition heat exchanger 17 and electric expansion valve 18 set temperature sensor 19, set temperature sensor 29 between air-condition heat exchanger 27 and electric expansion valve 28.
In an embodiment of the present invention, first temperature detecting module such as outdoor temperature sensor is used for detecting outdoor environment temperature T4 in real time, first pressure detecting module (being arranged on the pressure sensor such as low tension switch at each compressor return air mouth place) is for detecting the low-pressure lateral pressure of each compressor in each described module machine in real time, control module is used for the low-pressure lateral pressure rate of change △ P obtaining each compressor according to the low-pressure lateral pressure of each compressor detected in real time, and when described air-cooled heat pump water chiller-heater units enters defrost pattern, described outdoor environment temperature T4 is judged, wherein, if described outdoor environment temperature T4 is greater than the first preset temperature, described control module then controls described air-cooled heat pump water chiller-heater units according to the low-pressure lateral pressure rate of change △ P of each compressor and runs in rotation defrost mode.
According to one embodiment of present invention, when described air-cooled heat pump water chiller-heater units is run in rotation defrost mode, at least one module machine that described control module controls in described N number of module machine is opened, and keep at least one module machine in described N number of module machine to be in stopped status, and replace heating operation according to arbitrary module machine that the low-pressure lateral pressure rate of change △ Pa of each compressor corresponding to arbitrary module machine opened and the low-pressure lateral pressure rate of change △ Pb that is in each compressor corresponding to arbitrary module machine of stopped status controls this unlatching with the arbitrary module machine being in stopped status, and keep the blower fan in arbitrary module machine of this unlatching and the blower fan continuous service be in arbitrary module machine of stopped status, defrost is carried out with the forced-convection heat transfer by blower fan.
Further, when described air-cooled heat pump water chiller-heater units enters defrost pattern, if described outdoor environment temperature T4 is less than or equal to described first preset temperature, described control module then controls described air-cooled heat pump water chiller-heater units and runs with conventional Defrost mode.
Wherein, it should be noted that, the first preset temperature can be demarcated according to the concrete condition of air-cooled heat pump water chiller-heater units.And, conventional Defrost mode refer to air-cooled heat pump water chiller-heater units still with normal refrigerating operaton and blowing-out machine to carry out defrost, namely say, when outdoor environment temperature T4 is lower, air-cooled heat pump water chiller-heater units still carries out defrost by normal refrigerating operaton and blowing-out machine.And air-cooled heat pump water chiller-heater units runs i.e. rotation defrost between module machine in rotation defrost mode, only for specific outdoor environment temperature.
Particularly; according to one embodiment of present invention; when arbitrary module machine that arbitrary module machine of this unlatching is primary module machine, be in stopped status be first from module machine time, described control module realizes controlling described primary module machine and described first by following control flow and replaces heating operation from module machine:
A, the compressor controlled in described primary module machine are started shooting to make described primary module machine heating operation, and obtain the accumulation heat pamp of described primary module machine after described primary module machine heating operations;
B, when the low-pressure lateral pressure rate of change △ Pa that the accumulation heat pamp of described primary module machine reaches arbitrary compressor in very first time threshold value or described primary module machine is more than or equal to the first preset value, control the compressor shutdown in described primary module machine, blower fan in described primary module machine continues to run, and control described first from the compressor start module machine to make described first from module machine heating operation, and after module machine heating operation, obtain described first from the accumulation heat pamp of module machine described first;
C, when described first reaches the second time threshold or described first from the accumulation heat pamp of module machine the low-pressure lateral pressure rate of change △ Pb of arbitrary compressor is more than or equal to described first preset value from module machine; control described first from the compressor shutdown module machine; described first continues to run from the blower fan module machine, and returns execution step a.
And, when the accumulation heat pamp of described primary module machine does not reach described very first time threshold value and in described primary module machine, the low-pressure lateral pressure rate of change △ Pa of each compressor is all less than described first preset value, described control module controls described primary module machine and continues heating operation.When described first from the accumulation heat pamp of module machine do not reach described second time threshold and described first from module machine, the low-pressure lateral pressure rate of change △ Pb of each compressor is all less than described first preset value time, described control module controls described first and continues heating operation from module machine.
In sum, in an embodiment of the present invention, when air-cooled heat pump water chiller-heater units is run in rotation defrost mode, switch in turn between module machine by switching such as primary module machine and first between control module machine in turn, the heat that the continuation of the blower fan of utilization own runs and makes the frost on corresponding air-condition heat exchanger absorb surrounding environment carries out defrost, thus reduce and heat decay when heating defrost, greatly improve heating effect, improve Consumer's Experience.
According to the air-cooled heat pump water chiller-heater units of the embodiment of the present invention, when running in rotation defrost mode, at least one module machine that control module controls in N number of module machine is opened, and keep at least one module machine in N number of module machine to be in stopped status, then the arbitrary module machine controlling this unlatching according to the low-pressure lateral pressure rate of change △ Pa of each compressor corresponding to arbitrary module machine opened and the low-pressure lateral pressure rate of change △ Pb that is in each compressor corresponding to arbitrary module machine of stopped status replaces heating operation with the arbitrary module machine being in stopped status, and keep the blower fan in arbitrary module machine of this unlatching and the blower fan continuous service be in arbitrary module machine of stopped status, defrost is carried out with the forced-convection heat transfer by blower fan, namely by the switching between module machine, the continuation of the blower fan of utilization own runs carries out defrost, thus without the need to carrying out defrost by conversion refrigerating operaton and blowing-out machine, reduce and heat decay when heating defrost, greatly improve heating effect, improve Consumer's Experience.
In describing the invention, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ", " thickness ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", " outward ", " clockwise ", " counterclockwise ", " axis ", " radial direction ", orientation or the position relationship of the instruction such as " circumference " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore limitation of the present invention can not be interpreted as.
In addition, term " first ", " second " only for describing object, and can not be interpreted as instruction or hint relative importance or imply the quantity indicating indicated technical characteristic.Thus, be limited with " first ", the feature of " second " can express or impliedly comprise at least one this feature.In describing the invention, the implication of " multiple " is at least two, such as two, three etc., unless otherwise expressly limited specifically.
In the present invention, unless otherwise clearly defined and limited, the term such as term " installation ", " being connected ", " connection ", " fixing " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or integral; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals or the interaction relationship of two elements, unless otherwise clear and definite restriction.For the ordinary skill in the art, above-mentioned term concrete meaning in the present invention can be understood as the case may be.
In the present invention, unless otherwise clearly defined and limited, fisrt feature second feature " on " or D score can be that the first and second features directly contact, or the first and second features are by intermediary mediate contact.And, fisrt feature second feature " on ", " top " and " above " but fisrt feature directly over second feature or oblique upper, or only represent that fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " below " and " below " can be fisrt feature immediately below second feature or tiltedly below, or only represent that fisrt feature level height is less than second feature.
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, to the schematic representation of above-mentioned term not must for be identical embodiment or example.And the specific features of description, structure, material or feature can combine in one or more embodiment in office or example in an appropriate manner.In addition, when not conflicting, the feature of the different embodiment described in this description or example and different embodiment or example can carry out combining and combining by those skilled in the art.
Although illustrate and describe embodiments of the invention above, be understandable that, above-described embodiment is exemplary, can not be interpreted as limitation of the present invention, and those of ordinary skill in the art can change above-described embodiment within the scope of the invention, revises, replace and modification.
Claims (12)
1. the defrosting control method of an air-cooled heat pump water chiller-heater units, it is characterized in that, described air-cooled heat pump water chiller-heater units comprises N number of module machine, N be more than or equal to 2 integer, the outlet pipe of each described module machine is connected to total outlet pipe of described air-cooled heat pump water chiller-heater units respectively, the water inlet pipe of each described module machine is connected to the water inlet manifold of described air-cooled heat pump water chiller-heater units respectively, be connected in parallel to realize described N number of module machine, each described module machine comprises multiple water heating system, each described water heating system comprises compressor and air-condition heat exchanger, described defrosting control method comprises the following steps:
Real-time detection outdoor environment temperature T4, and the low-pressure lateral pressure detecting each compressor in each described module machine in real time;
The low-pressure lateral pressure rate of change △ P of each compressor is obtained according to the low-pressure lateral pressure of each compressor detected in real time;
When described air-cooled heat pump water chiller-heater units enters defrost pattern, described outdoor environment temperature T4 is judged;
If described outdoor environment temperature T4 is greater than the first preset temperature, then controls described air-cooled heat pump water chiller-heater units according to the low-pressure lateral pressure rate of change △ P of each compressor and run in rotation defrost mode.
2. the defrosting control method of air-cooled heat pump water chiller-heater units as claimed in claim 1, is characterized in that, when described air-cooled heat pump water chiller-heater units is run in rotation defrost mode, wherein,
At least one module machine controlled in described N number of module machine is opened, and is kept at least one module machine in described N number of module machine to be in stopped status; And
The arbitrary module machine controlling this unlatching according to the low-pressure lateral pressure rate of change △ Pa of each compressor corresponding to arbitrary module machine opened and the low-pressure lateral pressure rate of change △ Pb that is in each compressor corresponding to arbitrary module machine of stopped status replaces heating operation with the arbitrary module machine being in stopped status; and keep the blower fan in arbitrary module machine of this unlatching and the blower fan continuous service be in arbitrary module machine of stopped status, carry out defrost with the forced-convection heat transfer by blower fan.
3. the defrosting control method of air-cooled heat pump water chiller-heater units as claimed in claim 1, is characterized in that, also comprise:
If described outdoor environment temperature T4 is less than or equal to described first preset temperature, then controls described air-cooled heat pump water chiller-heater units and run with conventional Defrost mode.
4. the defrosting control method of air-cooled heat pump water chiller-heater units as claimed in claim 2; it is characterized in that; when arbitrary module machine that arbitrary module machine of this unlatching is primary module machine, be in stopped status be first from module machine time, arbitrary module machine that the low-pressure lateral pressure rate of change △ Pa of described each compressor corresponding to arbitrary module machine according to opening and the low-pressure lateral pressure rate of change △ Pb being in each compressor corresponding to arbitrary module machine of stopped status controls this unlatching replaces heating operation with the arbitrary module machine being in stopped status and specifically comprises:
A, the compressor controlled in described primary module machine are started shooting to make described primary module machine heating operation, and obtain the accumulation heat pamp of described primary module machine after described primary module machine heating operations;
B, when the low-pressure lateral pressure rate of change △ Pa that the accumulation heat pamp of described primary module machine reaches arbitrary compressor in very first time threshold value or described primary module machine is more than or equal to the first preset value, control the compressor shutdown in described primary module machine, blower fan in described primary module machine continues to run, and control described first from the compressor start module machine to make described first from module machine heating operation, and after module machine heating operation, obtain described first from the accumulation heat pamp of module machine described first;
C, when described first reaches the second time threshold or described first from the accumulation heat pamp of module machine the low-pressure lateral pressure rate of change △ Pb of arbitrary compressor is more than or equal to described first preset value from module machine; control described first from the compressor shutdown module machine; described first continues to run from the blower fan module machine, and returns execution step a.
5. the defrosting control method of air-cooled heat pump water chiller-heater units as claimed in claim 4; it is characterized in that, arbitrary module machine that the low-pressure lateral pressure rate of change △ Pa of described each compressor corresponding to arbitrary module machine according to opening and the low-pressure lateral pressure rate of change △ Pb being in each compressor corresponding to arbitrary module machine of stopped status controls this unlatching replaces heating operation with the arbitrary module machine being in stopped status and specifically also comprises:
When the accumulation heat pamp of described primary module machine does not reach described very first time threshold value and in described primary module machine, the low-pressure lateral pressure rate of change △ Pa of each compressor is all less than described first preset value, control described primary module machine and continue heating operation.
6. the defrosting control method of air-cooled heat pump water chiller-heater units as claimed in claim 4; it is characterized in that, arbitrary module machine that the low-pressure lateral pressure rate of change △ Pa of described each compressor corresponding to arbitrary module machine according to opening and the low-pressure lateral pressure rate of change △ Pb being in each compressor corresponding to arbitrary module machine of stopped status controls this unlatching replaces heating operation with the arbitrary module machine being in stopped status and specifically also comprises:
When described first from the accumulation heat pamp of module machine do not reach described second time threshold and described first from module machine, the low-pressure lateral pressure rate of change △ Pb of each compressor is all less than described first preset value time, control described first from module machine continue heating operation.
7. an air-cooled heat pump water chiller-heater units, is characterized in that, comprising:
N number of module machine, the outlet pipe of each described module machine is connected to total outlet pipe of described air-cooled heat pump water chiller-heater units respectively, the water inlet pipe of each described module machine is connected to the water inlet manifold of described air-cooled heat pump water chiller-heater units respectively, be connected in parallel to realize described N number of module machine, wherein, each described module machine comprises multiple water heating system, and each described water heating system comprises compressor and air-condition heat exchanger, N be more than or equal to 2 integer;
First temperature detecting module, for detecting outdoor environment temperature T4 in real time;
First pressure detecting module, for detecting the low-pressure lateral pressure of each compressor in each described module machine in real time;
Control module, for obtaining the low-pressure lateral pressure rate of change △ P of each compressor according to the low-pressure lateral pressure of each compressor detected in real time, and judges described outdoor environment temperature T4 when described air-cooled heat pump water chiller-heater units enters defrost pattern, wherein,
If described outdoor environment temperature T4 is greater than the first preset temperature, described control module then controls described air-cooled heat pump water chiller-heater units according to the low-pressure lateral pressure rate of change △ P of each compressor and runs in rotation defrost mode.
8. air-cooled heat pump water chiller-heater units as claimed in claim 7, it is characterized in that, when described air-cooled heat pump water chiller-heater units is run in rotation defrost mode, at least one module machine that described control module controls in described N number of module machine is opened, and keep at least one module machine in described N number of module machine to be in stopped status, and replace heating operation according to arbitrary module machine that the low-pressure lateral pressure rate of change △ Pa of each compressor corresponding to arbitrary module machine opened and the low-pressure lateral pressure rate of change △ Pb that is in each compressor corresponding to arbitrary module machine of stopped status controls this unlatching with the arbitrary module machine being in stopped status, and keep the blower fan in arbitrary module machine of this unlatching and the blower fan continuous service be in arbitrary module machine of stopped status, defrost is carried out with the forced-convection heat transfer by blower fan.
9. air-cooled heat pump water chiller-heater units as claimed in claim 7, it is characterized in that, when described air-cooled heat pump water chiller-heater units enters defrost pattern, if described outdoor environment temperature T4 is less than or equal to described first preset temperature, described control module then controls described air-cooled heat pump water chiller-heater units and runs with conventional Defrost mode.
10. air-cooled heat pump water chiller-heater units as claimed in claim 8; it is characterized in that; when arbitrary module machine that arbitrary module machine of this unlatching is primary module machine, be in stopped status be first from module machine time, described control module realizes controlling described primary module machine and described first by following control flow and replaces heating operation from module machine:
A, the compressor controlled in described primary module machine are started shooting to make described primary module machine heating operation, and obtain the accumulation heat pamp of described primary module machine after described primary module machine heating operations;
B, when the low-pressure lateral pressure rate of change △ Pa that the accumulation heat pamp of described primary module machine reaches arbitrary compressor in very first time threshold value or described primary module machine is more than or equal to the first preset value, control the compressor shutdown in described primary module machine, blower fan in described primary module machine continues to run, and control described first from the compressor start module machine to make described first from module machine heating operation, and after module machine heating operation, obtain described first from the accumulation heat pamp of module machine described first;
C, when described first reaches the second time threshold or described first from the accumulation heat pamp of module machine the low-pressure lateral pressure rate of change △ Pb of arbitrary compressor is more than or equal to described first preset value from module machine; control described first from the compressor shutdown module machine; described first continues to run from the blower fan module machine, and returns execution step a.
11. air-cooled heat pump water chiller-heater units as claimed in claim 10, it is characterized in that, when the accumulation heat pamp of described primary module machine does not reach described very first time threshold value and in described primary module machine, the low-pressure lateral pressure rate of change △ Pa of each compressor is all less than described first preset value, described control module controls described primary module machine and continues heating operation.
12. air-cooled heat pump water chiller-heater units as claimed in claim 10, it is characterized in that, when described first from the accumulation heat pamp of module machine do not reach described second time threshold and described first from module machine, the low-pressure lateral pressure rate of change △ Pb of each compressor is all less than described first preset value time, described control module controls described first and continues heating operation from module machine.
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| PCT/CN2016/096049 WO2017050072A1 (en) | 2015-09-23 | 2016-08-19 | Water chiller-heater unit of air cooled heat pump and defrosting control method therefor |
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Application publication date: 20151202 Assignee: HEFEI MIDEA HEATING & VENTILATING EQUIPMENT Co.,Ltd. Assignor: Guangdong Midea HVAC Equipment Co., Ltd.|Midea Group Co., Ltd Contract record no.: X2020990000170 Denomination of invention: Air cooled heat pump cold and hot water unit and defrosting control method thereof Granted publication date: 20171208 License type: Common License Record date: 20200409 |
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