CN117299251A - Working condition switching method and device for high-low temperature test box and high-low temperature test box - Google Patents
Working condition switching method and device for high-low temperature test box and high-low temperature test box Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 60
- 238000004146 energy storage Methods 0.000 claims abstract description 640
- 239000003507 refrigerant Substances 0.000 claims abstract description 87
- 238000004378 air conditioning Methods 0.000 claims abstract description 59
- 238000012544 monitoring process Methods 0.000 claims abstract description 38
- 239000011232 storage material Substances 0.000 claims abstract description 30
- 230000004044 response Effects 0.000 claims abstract description 5
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 28
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 238000004590 computer program Methods 0.000 claims description 6
- 239000008213 purified water Substances 0.000 claims description 3
- 238000005265 energy consumption Methods 0.000 abstract description 9
- 230000001276 controlling effect Effects 0.000 description 74
- 238000010438 heat treatment Methods 0.000 description 36
- 238000005057 refrigeration Methods 0.000 description 26
- 238000001816 cooling Methods 0.000 description 11
- 238000010586 diagram Methods 0.000 description 10
- 238000005338 heat storage Methods 0.000 description 9
- 238000001704 evaporation Methods 0.000 description 8
- 230000008020 evaporation Effects 0.000 description 6
- 238000004134 energy conservation Methods 0.000 description 5
- 230000009467 reduction Effects 0.000 description 5
- 239000002826 coolant Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000005485 electric heating Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L7/00—Heating or cooling apparatus; Heat insulating devices
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- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/002—Test chambers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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Abstract
The invention discloses a working condition switching method and device for a high-low temperature test box and the high-low temperature test box. The high-low temperature test chamber comprises: the air conditioning system and the at least one energy storage device are internally provided with a cold storage agent and a refrigerant pipeline, the energy storage device is connected with an outdoor heat exchanger in the air conditioning system in parallel through the refrigerant pipeline, and both the branch circuit where the outdoor heat exchanger is located and the branch circuit where the energy storage device is located are on-off controllable; the method comprises the following steps: monitoring the internal temperature of the energy storage device in response to a working condition switching instruction; the air conditioning system is controlled to operate according to the refrigerant flow direction corresponding to the working condition switching instruction, and the on-off of the branch where the outdoor heat exchanger is located and the branch where the energy storage device is located are controlled according to the working condition switching instruction, the number of the energy storage devices and the internal temperature of the energy storage devices. The invention can store the energy loss in the working condition switching into the energy storage device, and can be used in the next switching, thereby improving the energy efficiency of the system in the whole life cycle, saving energy and reducing emission, and solving the problem of higher energy consumption of the high-low temperature test box in the working condition switching.
Description
Technical Field
The invention relates to the technical field of high-low temperature test boxes, in particular to a working condition switching method and device of a high-low temperature test box and the high-low temperature test box.
Background
In the test equipment, the high-low temperature test box is a common environmental test equipment, and is mainly characterized by wide application temperature range, continuous high-temperature, low-temperature and damp-heat working condition test, no need of transferring samples to other equipment, and improved test efficiency.
In order to achieve the effects, a set of refrigerating system is arranged in the high-low temperature test box and used for cooling, a set of electric heating system is used for heating, and a set of humidifying system is used for regulating humidity. However, when alternating damp heat (switching at 30-60 ℃) and high-low temperature test switching (-switching at 25-70 ℃) are required, the high-low temperature test box is frequently switched between refrigeration and heating working conditions due to the back-and-forth switching of test working conditions, and the electric energy consumed in the annual switching of one set of equipment can reach hundreds of thousands of yuan.
At present, an energy storage type rapid temperature change high-low temperature test box is provided, wherein a refrigerating chamber, a working chamber and an energy storage chamber are arranged in the energy storage type rapid temperature change high-low temperature test box, and a refrigerating system in the refrigerating chamber can respectively supply cold for the working chamber and the energy storage chamber. The energy storage chamber is used for refrigerating in advance when the working chamber is subjected to high-temperature test, and the two chambers are communicated when the working chamber is subjected to low-temperature test, so that the cooling efficiency of the working chamber is improved. According to the scheme, the time consumed by the conversion of the test working conditions can be reduced, the test efficiency is further improved, but the heat insulation effect of the energy storage chamber cannot be achieved, and whether the actual consumed electric energy is increased or not is judged.
Aiming at the problem that the high-low temperature test box in the prior art has higher energy consumption during working condition switching, no effective solution is proposed at present.
Disclosure of Invention
The embodiment of the invention provides a working condition switching method and device for a high-low temperature test box and the high-low temperature test box, which at least solve the problem that the high-low temperature test box in the prior art has higher energy consumption during working condition switching.
In order to solve the above technical problems, an embodiment of the present invention provides a method for switching working conditions of a high-low temperature test chamber, where the high-low temperature test chamber includes: the air conditioning system comprises an air conditioning system and at least one energy storage device, wherein a cold storage agent and a refrigerant pipeline are arranged in the energy storage device, the energy storage device is connected with an outdoor heat exchanger in the air conditioning system in parallel through the refrigerant pipeline, and both a branch circuit where the outdoor heat exchanger is located and a branch circuit where the energy storage device is located are controllable in on-off; the method comprises the following steps:
monitoring the internal temperature of the energy storage device in response to a working condition switching instruction;
and controlling the air conditioning system to operate according to the refrigerant flow direction corresponding to the working condition switching instruction, and controlling the on-off of the branch where the outdoor heat exchanger is located and the branch where the energy storage device is located according to the working condition switching instruction, the number of the energy storage devices and the internal temperature of the energy storage devices.
Optionally, controlling the air conditioning system to operate according to a refrigerant flow direction corresponding to the working condition switching instruction includes:
if the working condition switching instruction is from a high-temperature working condition to a low-temperature working condition, controlling the air conditioning system to operate according to the flow direction of the refrigerating refrigerant;
and if the working condition switching instruction is that the working condition is switched from the low-temperature working condition to the high-temperature working condition, controlling the air conditioning system to operate according to the flow direction of the heated refrigerant.
Optionally, according to the working condition switching instruction, the number of the energy storage devices and the internal temperature of the energy storage devices, controlling the on-off of the branch where the outdoor heat exchanger is located and the branch where the energy storage devices are located, including:
if the number of the energy storage devices is 2 or more, determining a high-temperature energy storage device and a low-temperature energy storage device in all the energy storage devices, and controlling the on-off of a branch where the outdoor heat exchanger is located and a branch where the energy storage device is located according to the working condition switching instruction, the internal temperature of the energy storage device and the external environment temperature of the tank;
and if the number of the energy storage devices is 1, controlling the on-off of the branch where the outdoor heat exchanger is located and the branch where the energy storage devices are located according to the working condition switching instruction and the internal temperature of the energy storage devices.
Optionally, controlling the on-off of the branch where the outdoor heat exchanger is located and the branch where the energy storage device is located according to the working condition switching instruction, the internal temperature of the energy storage device and the external environment temperature of the tank, including:
judging the internal temperature of the energy storage device under the condition that the working condition switching instruction is from a high-temperature working condition to a low-temperature working condition;
if the internal temperature of the low-temperature energy storage device is smaller than the external environment temperature of the box and the first preset value, controlling the branch circuit where the low-temperature energy storage device is located to be conducted, and disconnecting the branch circuit where the outdoor heat exchanger is located and the branch circuit where the high-temperature energy storage device is located so as to enable the low-temperature energy storage device to release cold energy;
if the internal temperature of the low-temperature energy storage device is greater than or equal to the outside environment temperature plus a first preset value and the internal temperature of the high-temperature energy storage device is less than the first preset temperature, controlling the branch where the high-temperature energy storage device is located to be conducted, and disconnecting the branch where the outdoor heat exchanger is located and the branch where the low-temperature energy storage device is located so that the high-temperature energy storage device stores heat;
if the internal temperature of the low-temperature energy storage device is greater than or equal to the outside environment temperature plus the first preset value and the internal temperature of the high-temperature energy storage device is greater than or equal to the first preset temperature, the branch circuit where the outdoor heat exchanger is located is controlled to be conducted, the branch circuit where the high-temperature energy storage device is located and the branch circuit where the low-temperature energy storage device is located are disconnected, and the internal temperature of the energy storage device is continuously monitored.
Optionally, after the branch where the low-temperature energy storage device is controlled to be turned on and the branch where the outdoor heat exchanger is turned off and the branch where the high-temperature energy storage device is controlled to be turned off, the method further includes:
when the internal temperature of the low-temperature energy storage device is monitored to be greater than or equal to the outside environment temperature of the tank plus a second preset value, stopping the low-temperature energy storage device from releasing cold and judging the internal temperature of the energy storage device again;
wherein, the outside environment temperature+the first preset value is less than the outside environment temperature+the second preset value.
Optionally, after the branch where the high-temperature energy storage device is controlled to be turned on and the branch where the outdoor heat exchanger is turned off and the branch where the low-temperature energy storage device is controlled to be turned off, the method further includes:
when the internal temperature of the high-temperature energy storage device is monitored to be greater than or equal to a second preset temperature, stopping the high-temperature energy storage device to store heat and judging the internal temperature of the energy storage device again;
wherein the second preset temperature is greater than the first preset temperature.
Optionally, after the branch where the high-temperature energy storage device is controlled to be turned on and the branch where the outdoor heat exchanger is turned off and the branch where the low-temperature energy storage device is controlled to be turned off, the method further includes:
Monitoring an exhaust temperature of the air conditioning system;
when the exhaust temperature is higher than the exhaust temperature upper limit value, controlling a branch circuit where the outdoor heat exchanger is located to be conducted, taking the outdoor heat exchanger as a main condenser, and taking the high-temperature energy storage device as a backup condenser;
and controlling the refrigerant flow ratio of the branch circuit where the outdoor heat exchanger is positioned and the branch circuit where the high-temperature energy storage device is positioned so as to enable the exhaust temperature to be stable in a preset exhaust temperature range, wherein the exhaust temperature is reduced by reducing the refrigerant flow ratio of the branch circuit where the high-temperature energy storage device is positioned.
Optionally, controlling the on-off of the branch where the outdoor heat exchanger is located and the branch where the energy storage device is located according to the working condition switching instruction, the internal temperature of the energy storage device and the external environment temperature of the tank, including:
judging the internal temperature of the energy storage device under the condition that the working condition switching instruction is from a low-temperature working condition to a high-temperature working condition;
if the internal temperature of the high-temperature energy storage device is greater than or equal to the outside environment temperature plus a third preset value, controlling the branch where the high-temperature energy storage device is located to be conducted, and disconnecting the branch where the outdoor heat exchanger is located and the branch where the low-temperature energy storage device is located so as to enable the high-temperature energy storage device to release heat;
If the internal temperature of the high-temperature energy storage device is smaller than the external environment temperature of the box and the third preset value, and the internal temperature of the low-temperature energy storage device is larger than or equal to the third preset temperature, controlling the branch circuit where the low-temperature energy storage device is located to be conducted, and disconnecting the branch circuit where the outdoor heat exchanger is located and the branch circuit where the high-temperature energy storage device is located so as to enable the low-temperature energy storage device to store cold;
if the internal temperature of the high-temperature energy storage device is smaller than the outside environment temperature of the box and the third preset value, and the internal temperature of the low-temperature energy storage device is smaller than the third preset temperature, the branch where the outdoor heat exchanger is located is controlled to be conducted, the branch where the high-temperature energy storage device is located and the branch where the low-temperature energy storage device is located are disconnected, and the internal temperature of the energy storage device is continuously monitored.
Optionally, after the branch where the high-temperature energy storage device is controlled to be turned on and the branch where the outdoor heat exchanger is turned off and the branch where the low-temperature energy storage device is controlled to be turned off, the method further includes:
when the internal temperature of the high-temperature energy storage device is monitored to be smaller than the outside environment temperature plus a fourth preset value, stopping releasing heat by the high-temperature energy storage device and judging the internal temperature of the energy storage device again;
wherein, the outside environment temperature+the third preset value > the outside environment temperature+the fourth preset value.
Optionally, after the branch where the low-temperature energy storage device is controlled to be turned on and the branch where the outdoor heat exchanger is turned off and the branch where the high-temperature energy storage device is controlled to be turned off, the method further includes:
when the internal temperature of the low-temperature energy storage device is monitored to be smaller than a fourth preset temperature, stopping the low-temperature energy storage device to store cold energy and judging the internal temperature of the energy storage device again;
wherein the fourth preset temperature is less than the third preset temperature.
Optionally, after the branch where the low-temperature energy storage device is controlled to be turned on and the branch where the outdoor heat exchanger is turned off and the branch where the high-temperature energy storage device is controlled to be turned off, the method further includes:
monitoring the suction superheat degree of the air conditioning system;
when the suction superheat degree is smaller than the suction superheat degree lower limit value, controlling a branch where the outdoor heat exchanger is located to be conducted, taking the outdoor heat exchanger as a main evaporator and taking the low-temperature energy storage device as a standby evaporator;
and controlling the refrigerant flow ratio of the branch circuit where the outdoor heat exchanger is positioned and the branch circuit where the low-temperature energy storage device is positioned so as to ensure that the suction superheat degree is stabilized in a preset suction superheat degree range, wherein the suction superheat degree is improved by reducing the refrigerant flow ratio of the branch circuit where the low-temperature energy storage device is positioned.
Optionally, controlling the on-off of the branch where the outdoor heat exchanger is located and the branch where the energy storage device is located according to the working condition switching instruction and the internal temperature of the energy storage device, including:
judging the internal temperature of the energy storage device under the condition that the working condition switching instruction is from a high-temperature working condition to a low-temperature working condition;
if the internal temperature of the energy storage device is smaller than a first preset temperature, the branch where the outdoor heat exchanger is located is controlled to be disconnected and the branch where the energy storage device is located is controlled to be conducted, so that the energy storage device serves as a condenser; when the internal temperature of the energy storage device is monitored to be greater than or equal to a second preset temperature, stopping the energy storage device as a condenser and judging the internal temperature of the energy storage device again; wherein the second preset temperature is greater than the first preset temperature;
and if the internal temperature of the energy storage device is greater than or equal to the first preset temperature, controlling the branch circuit where the outdoor heat exchanger is located to be conducted, disconnecting the branch circuit where the energy storage device is located, and continuously monitoring the internal temperature of the energy storage device.
Optionally, after controlling the branch where the outdoor heat exchanger is located to be disconnected and the branch where the energy storage device is located to be connected, the method further includes:
Monitoring an exhaust temperature of the air conditioning system;
when the exhaust temperature is higher than the exhaust temperature upper limit value, controlling a branch circuit where the outdoor heat exchanger is located to be conducted, taking the outdoor heat exchanger as a main condenser, and taking the energy storage device as a backup condenser;
and controlling the refrigerant flow ratio of the branch circuit where the outdoor heat exchanger is positioned and the branch circuit where the energy storage device is positioned so as to enable the exhaust temperature to be stable in a preset exhaust temperature range, wherein the exhaust temperature is reduced by reducing the refrigerant flow ratio of the branch circuit where the energy storage device is positioned.
Optionally, controlling the on-off of the branch where the outdoor heat exchanger is located and the branch where the energy storage device is located according to the working condition switching instruction and the internal temperature of the energy storage device, including:
judging the internal temperature of the energy storage device under the condition that the working condition switching instruction is from a low-temperature working condition to a high-temperature working condition;
if the internal temperature of the energy storage device is greater than or equal to a third preset temperature, the branch where the outdoor heat exchanger is located is controlled to be disconnected and the branch where the energy storage device is located is controlled to be conducted, so that the energy storage device serves as an evaporator; when the internal temperature of the energy storage device is monitored to be smaller than a fourth preset temperature, stopping the energy storage device as an evaporator and judging the internal temperature of the energy storage device again; wherein the fourth preset temperature is less than the third preset temperature;
And if the internal temperature of the energy storage device is smaller than the third preset temperature, controlling the branch circuit where the outdoor heat exchanger is located to be conducted, disconnecting the branch circuit where the energy storage device is located, and continuously monitoring the internal temperature of the energy storage device.
Optionally, after controlling the branch where the outdoor heat exchanger is located to be disconnected and the branch where the energy storage device is located to be connected, the method further includes:
monitoring the suction superheat degree of the air conditioning system;
when the suction superheat degree is smaller than the suction superheat degree lower limit value, controlling a branch where the outdoor heat exchanger is located to be conducted, taking the outdoor heat exchanger as a main evaporator and taking the energy storage device as a standby evaporator;
and controlling the refrigerant flow ratio of the branch circuit where the outdoor heat exchanger is positioned and the branch circuit where the energy storage device is positioned so as to enable the suction superheat degree to be stable in a preset suction superheat degree range, wherein the suction superheat degree is improved by reducing the refrigerant flow ratio of the branch circuit where the energy storage device is positioned.
Optionally, pure water is used as the cold storage agent in the high-temperature energy storage device, and an ethylene glycol solution is used as the cold storage agent in the low-temperature energy storage device.
The embodiment of the invention also provides a working condition switching device of the high-low temperature test box, which comprises: the air conditioning system comprises an air conditioning system and at least one energy storage device, wherein a cold storage agent and a refrigerant pipeline are arranged in the energy storage device, the energy storage device is connected with an outdoor heat exchanger in the air conditioning system in parallel through the refrigerant pipeline, and both a branch circuit where the outdoor heat exchanger is located and a branch circuit where the energy storage device is located are controllable in on-off; the working condition switching device of the high-low temperature test chamber comprises:
The monitoring module is used for responding to the working condition switching instruction and monitoring the internal temperature of the energy storage device;
the control module is used for controlling the air conditioning system to operate according to the refrigerant flow direction corresponding to the working condition switching instruction, and controlling the on-off of the branch where the outdoor heat exchanger is located and the branch where the energy storage device is located according to the working condition switching instruction, the number of the energy storage devices and the internal temperature of the energy storage devices.
The embodiment of the invention also provides a high-low temperature test box, which comprises: the embodiment of the invention provides a working condition switching device for a high-low temperature test box.
The embodiments of the present invention also provide a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the method of the embodiments of the present invention.
By applying the technical scheme of the invention, at least one energy storage device connected in parallel with the outdoor heat exchanger is arranged in the high-low temperature test box, and the cold or heat wasted originally can be stored in the energy storage device when the working condition is switched in the high-low temperature test box, so that the energy loss during working condition switching is effectively utilized when the working condition is switched next time, the energy efficiency of the system in the whole life cycle is improved, the energy is saved, the emission is reduced, and the problem that the energy consumption of the high-low temperature test box in the prior art is higher when the working condition is switched is solved.
Drawings
FIG. 1 is a flow chart of a method for switching working conditions of a high and low temperature test chamber according to an embodiment of the invention;
fig. 2 is a cross-sectional view of an energy storage device according to a second embodiment of the present invention;
FIG. 3 is a flow chart of the refrigerant when the high and low temperature test chamber provided by the second embodiment of the invention is used for refrigerating;
fig. 4 is a schematic diagram of a refrigeration condition cooling capacity release mode according to a second embodiment of the present invention;
FIG. 5 is a schematic diagram of a heat storage mode under refrigeration conditions according to a second embodiment of the present invention;
FIG. 6 is another schematic diagram of a heat storage mode for a refrigeration condition according to a second embodiment of the present invention;
FIG. 7 is a schematic diagram of a conventional heat exchange mode under refrigeration conditions according to a second embodiment of the present invention;
FIG. 8 is a flow chart of the refrigerant when the high and low temperature test chamber provided by the second embodiment of the invention heats;
FIG. 9 is a schematic diagram of a heat release mode in a heating operation according to a second embodiment of the present invention;
FIG. 10 is a schematic diagram of a cooling capacity storage mode under heating conditions according to a second embodiment of the present invention;
FIG. 11 is another schematic diagram of a cooling capacity storage mode under heating conditions according to a second embodiment of the present invention;
FIG. 12 is a schematic diagram of a conventional heat exchange mode for a heating operation according to a second embodiment of the present invention;
FIG. 13 is a block diagram of a switching device for working conditions of a high and low temperature test chamber according to a third embodiment of the present invention;
Reference numerals illustrate:
the air conditioner comprises a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, a throttling device 4, an indoor heat exchanger 5, a first energy storage device 6, a second energy storage device 7, an indoor fan 51, an outdoor fan 32, a first valve 61, a second valve 71, a third valve 31, an energy storage device shell 10, a refrigerant pipeline 20 and a cold storage agent 30.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that the terms "first," "second," and the like in the description and the claims and drawings of the present invention are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It should be noted that the steps illustrated in the flowcharts of the figures may be performed in a computer system such as a set of computer executable instructions, and that although a logical order is illustrated in the flowcharts, in some cases the steps illustrated or described may be performed in an order other than that illustrated herein.
Alternative embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Example 1
The high and low temperature test chamber in this embodiment includes: the air conditioning system comprises an air conditioning system and at least one energy storage device, wherein a cold storage agent and a refrigerant pipeline are arranged in the energy storage device, the energy storage device is connected with an outdoor heat exchanger in the air conditioning system in parallel through the refrigerant pipeline, and both a branch where the outdoor heat exchanger is located and a branch where the energy storage device is located are on-off controllable.
The air conditioning system may be a single cooling system or a heat pump system with a four-way valve. The refrigerant flowing in the refrigerant pipeline of the energy storage device exchanges heat with the cold storage agent in the energy storage device to realize energy storage or release. The high and low temperature test chamber may further comprise: the electric heating system is used for heating and the humidifying system is used for adjusting humidity so as to meet the requirements of test working conditions.
Valves can be installed on the branch where the outdoor heat exchanger is located and the branch where the energy storage device is located. When the valve is opened, the corresponding branch is conducted; closing the valve, and disconnecting the corresponding branch; the opening of the valve is changed, so that the flow of the refrigerant of the corresponding branch circuit can be adjusted.
Fig. 1 is a flowchart of a method for switching working conditions of a high-low temperature test chamber according to an embodiment of the present invention, as shown in fig. 1, the method includes the following steps:
s101, monitoring the internal temperature of the energy storage device in response to a working condition switching instruction.
S102, controlling the air conditioning system to operate according to the refrigerant flow direction corresponding to the working condition switching instruction, and controlling the on-off of the branch where the outdoor heat exchanger is located and the branch where the energy storage device is located according to the working condition switching instruction, the number of the energy storage devices and the internal temperature of the energy storage devices.
The user may initiate a condition switching command according to actual test requirements, for example, switching from a high temperature condition to a low temperature condition, or switching from a low temperature condition to a high temperature condition. The high temperature working condition is a heating working condition, and the low temperature working condition is a refrigerating working condition.
The internal temperature of the energy storage device refers to the temperature of the cold storage agent in the energy storage device. A temperature sensor may be provided within each energy storage device to detect the temperature of its coolant.
According to the embodiment, the at least one energy storage device connected with the outdoor heat exchanger in parallel is arranged in the high-low temperature test box, when the working condition of the high-low temperature test box is switched, the originally wasted cold energy or heat can be stored in the energy storage device, the energy storage device is used when the working condition is switched next time, the energy loss during working condition switching is effectively utilized, the energy efficiency of the system in the whole life cycle is improved, energy conservation and emission reduction are realized, and the problem that the energy consumption of the high-low temperature test box in the prior art is higher when the working condition is switched is solved.
In one embodiment, the control air conditioning system operates according to a refrigerant flow direction corresponding to a condition switching command, including: if the working condition switching instruction is from the high-temperature working condition to the low-temperature working condition, controlling the air conditioning system to operate according to the flow direction of the refrigerant for refrigeration; and if the working condition switching instruction is that the low-temperature working condition is switched to the high-temperature working condition, controlling the air conditioning system to operate according to the flow direction of the heated refrigerant. Therefore, the user test requirements can be met.
In one embodiment, according to the working condition switching instruction, the number of energy storage devices and the internal temperature of the energy storage devices, the on-off of the branch where the outdoor heat exchanger is located and the branch where the energy storage devices are located is controlled, and the method comprises the following steps:
if the number of the energy storage devices is 2 or more, determining a high-temperature energy storage device and a low-temperature energy storage device in all the energy storage devices, and controlling the on-off of a branch where the outdoor heat exchanger is located and a branch where the energy storage device is located according to a working condition switching instruction, the internal temperature of the energy storage device and the external environment temperature of the tank;
and if the number of the energy storage devices is 1, controlling the on-off of the branch where the outdoor heat exchanger is located and the branch where the energy storage devices are located according to the working condition switching instruction and the internal temperature of the energy storage devices.
Under the condition that 2 or more than 2 energy storage devices are arranged in the high-low temperature test box, the high-temperature energy storage device and the low-temperature energy storage device can be distinguished, the high-temperature energy storage device can store heat and release heat, and the low-temperature energy storage device can store cold and release cold. The high and low temperature test chamber may be provided with at least one high temperature type energy storage device and at least one low temperature type energy storage device, for example, the high and low temperature test chamber includes 3 energy storage devices, 2 high temperature type energy storage devices and 1 low temperature type energy storage device.
The glycol solution has the lowest freezing point at 66 percent concentration, can bear the temperature below minus 35 ℃ and is not solidified, and for a closed energy storage device, if an internal cold storage agent is solidified, the shell can be cracked; however, the higher the concentration of the glycol solution, the lower the specific heat capacity, and the poorer the cold storage effect. Therefore, pure water is used as the cold storage agent in the high-temperature energy storage device, and a glycol solution is used as the cold storage agent in the low-temperature energy storage device, and different solution concentrations, such as a 66% glycol solution, are selected according to the use temperature of the energy storage device.
According to the energy storage device control method, based on the number of the energy storage devices, different controls are executed, and energy loss during working condition switching can be utilized more reasonably while the test requirements of users are met, so that energy conservation and emission reduction are achieved.
Several situations are described below based on the number of energy storage devices and specific operating mode switching instructions.
(1) The number of the energy storage devices is 2 or more, and the energy storage devices are switched from a high-temperature working condition to a low-temperature working condition
Specifically, according to operating mode switching instruction, energy storage device inside temperature and outside environment temperature, the break-make of the branch road that the outdoor heat exchanger is located and the branch road that the energy storage device is located is controlled to the outside, includes:
judging the internal temperature of the energy storage device under the condition that the working condition switching instruction is switched from a high-temperature working condition to a low-temperature working condition;
1) If the internal temperature of the low-temperature energy storage device is less than the external environment temperature of the box and the first preset value, controlling the branch circuit of the low-temperature energy storage device to be conducted, and disconnecting the branch circuit of the outdoor heat exchanger and the branch circuit of the high-temperature energy storage device so as to enable the low-temperature energy storage device to release cold; the high-low temperature test box enters a refrigerating condition cold energy release mode, and the low-temperature energy storage device is used as a condenser to release cold energy in the low-temperature energy storage device;
2) If the internal temperature of the low-temperature energy storage device is greater than or equal to the outside environment temperature plus a first preset value and the internal temperature of the high-temperature energy storage device is less than the first preset temperature, controlling the branch where the high-temperature energy storage device is located to be conducted, and disconnecting the branch where the outdoor heat exchanger is located and the branch where the low-temperature energy storage device is located so that the high-temperature energy storage device stores heat; the high-low temperature test box enters a refrigerating working condition heat storage mode, and the high-temperature energy storage device is used as a condenser to store heat in the high-temperature energy storage device;
3) If the internal temperature of the low-temperature energy storage device is greater than or equal to the external environment temperature of the tank+a first preset value, and the internal temperature of the high-temperature energy storage device is greater than or equal to the first preset temperature, the branch where the outdoor heat exchanger is controlled to be conducted, and the branch where the high-temperature energy storage device is disconnected from the branch where the low-temperature energy storage device is located, namely, the high-low temperature test tank enters a normal heat exchange mode under refrigeration working conditions, the outdoor heat exchanger is used as a condenser at the moment, the internal temperature of the energy storage device is continuously monitored, and when the internal temperature of the energy storage device meets the condition 1) or 2), the operation is automatically switched to a corresponding mode.
The first preset value and the first preset temperature can be set according to actual conditions. The first preset value may be a positive value, a negative value or 0, and is generally smaller, for example, the first preset value is 2 ℃, -3 ℃ or 0 ℃. The first preset temperature is used for measuring whether the energy storage device needs to store energy during refrigeration, for example, the first preset temperature is 90 ℃.
According to the embodiment, when the high-low temperature test box is switched from a high-temperature working condition to a low-temperature working condition, the on-off of the branch where the outdoor heat exchanger is located and the branch where the energy storage device is located is controlled according to the internal temperature of the energy storage device and the external environment temperature of the box, so that the high-low temperature test box enters a corresponding mode to operate, the cold energy in the energy storage device is preferentially utilized, the energy consumption is reduced, then the heat is stored in the energy storage device, finally, the outdoor heat exchanger is used for conventional refrigeration work, the target working condition temperature is reached, the energy loss during working condition switching is effectively utilized, and the energy conservation and emission reduction are realized.
Further, if the foregoing condition 1) is satisfied, after the branch where the low-temperature energy storage device is controlled to be turned on and the branch where the outdoor heat exchanger is turned off and the branch where the high-temperature energy storage device is turned off, the method further includes: when the internal temperature of the low-temperature energy storage device is monitored to be greater than or equal to the outside environment temperature of the box and the second preset value, stopping the low-temperature energy storage device to release cold energy and judging the internal temperature of the energy storage device again, namely, exiting the current mode and judging again, and particularly disconnecting the branch where the low-temperature energy storage device is located.
Wherein, the outside environment temperature+the first preset value is less than the outside environment temperature+the second preset value. The second preset value may be set according to actual conditions. The second preset value may be a positive value, a negative value or 0, for example, the second preset value is 20 ℃.
And taking the external environment temperature as a reference, and considering that the internal temperature of the low-temperature energy storage device is lower than the external environment temperature of the box, the low-temperature energy storage device is suitable for controlling the refrigeration working condition cold release mode. Considering that the higher the temperature is, the lower the heat exchange efficiency is, and the high-pressure protection and the high-temperature protection of the exhaust gas of the compressor are easy to occur when the energy storage device is used as the condenser, the embodiment prescribes the condition of exiting the refrigeration working condition cold release mode based on the second preset value. The first preset value and the second preset value can be freely adjusted according to actual use conditions, namely, the mode is entered when the internal temperature of the low-temperature energy storage device is smaller than the external environment temperature + -x ℃ and the mode is exited when the internal temperature of the low-temperature energy storage device is larger than or equal to the external environment temperature + -y ℃.
According to the embodiment, the refrigeration working condition cold quantity release mode can be timely exited, so that the conditions of low heat exchange efficiency or high-pressure protection caused by high temperature of the low-temperature energy storage device are avoided.
Further, if the foregoing condition 2) is satisfied, after the branch where the high-temperature energy storage device is controlled to be turned on and the branch where the outdoor heat exchanger is turned off and the branch where the low-temperature energy storage device is turned off, the method further includes: when the internal temperature of the high-temperature energy storage device is monitored to be greater than or equal to the second preset temperature, the high-temperature energy storage device is stopped to store heat and judge the internal temperature of the energy storage device again, namely, the current working mode is exited and the judgment is repeated, and particularly, the branch where the high-temperature energy storage device is located is disconnected.
Wherein the second preset temperature is greater than the first preset temperature. The second preset temperature may be set according to actual conditions. The second preset temperature is used for measuring whether the energy storage device stores energy completely during refrigeration, for example, the second preset temperature is 100 ℃.
The embodiment can timely exit the refrigeration working condition heat storage mode.
Considering that the higher the refrigerant flow ratio of the energy storage device is, the worse the heat exchange of the condensing side of the air conditioning system is, the higher the exhaust temperature is, and the irreversible damage to the compressor motor is caused by the overhigh exhaust temperature, therefore, after the branch where the high-temperature energy storage device is controlled to be conducted and the branch where the outdoor heat exchanger is disconnected from the branch where the low-temperature energy storage device is, the method can further comprise: monitoring the exhaust temperature of the air conditioning system; when the exhaust temperature is higher than the upper limit value of the exhaust temperature, controlling a branch circuit where the outdoor heat exchanger is positioned to be conducted, taking the outdoor heat exchanger as a main condenser, and taking the high-temperature energy storage device as a backup condenser; and controlling the refrigerant flow ratio of the branch circuit where the outdoor heat exchanger is positioned and the branch circuit where the high-temperature energy storage device is positioned so as to ensure that the exhaust temperature is stabilized in a preset exhaust temperature range, wherein the exhaust temperature is reduced by reducing the refrigerant flow ratio of the branch circuit where the high-temperature energy storage device is positioned.
The preset exhaust temperature range is [ exhaust temperature lower limit value, exhaust temperature upper limit value ], and the preset exhaust temperature range can be set according to practical situations, for example, the preset exhaust temperature range is [100 ℃,105 ℃). Specifically, when the exhaust temperature is greater than the exhaust temperature upper limit value, reducing the valve opening of the branch where the high-temperature energy storage device is positioned and increasing the valve opening of the branch where the outdoor heat exchanger is positioned; when the exhaust temperature is smaller than the lower limit value of the exhaust temperature, the valve opening of the branch where the high-temperature energy storage device is located is increased, and the valve opening of the branch where the outdoor heat exchanger is located is reduced.
According to the embodiment, in the refrigeration working condition heat storage mode, the exhaust temperature can be controlled in the preset exhaust temperature range by adjusting the refrigerant flow ratio of the two paths of condensers, so that the damage of the compressor caused by the overhigh exhaust temperature is avoided.
(2) The number of the energy storage devices is 2 or more, and the energy storage devices are switched from a low-temperature working condition to a high-temperature working condition
Specifically, according to operating mode switching instruction, energy storage device inside temperature and outside environment temperature, the break-make of the branch road that the outdoor heat exchanger is located and the branch road that the energy storage device is located is controlled to the outside, includes:
judging the internal temperature of the energy storage device under the condition that the working condition switching instruction is switched from a low-temperature working condition to a high-temperature working condition;
1) If the internal temperature of the high-temperature energy storage device is greater than or equal to the outside environment temperature plus a third preset value, controlling the branch where the high-temperature energy storage device is located to be conducted, and disconnecting the branch where the outdoor heat exchanger is located and the branch where the low-temperature energy storage device is located so as to enable the high-temperature energy storage device to release heat; the high-low temperature test box enters a heating working condition heat release mode, and the high-temperature energy storage device is used as an evaporator to release heat in the high-temperature energy storage device;
2) If the internal temperature of the high-temperature energy storage device is smaller than the external environment temperature of the box and the third preset value, and the internal temperature of the low-temperature energy storage device is larger than or equal to the third preset temperature, controlling the branch where the low-temperature energy storage device is located to be conducted, and disconnecting the branch where the outdoor heat exchanger is located and the branch where the high-temperature energy storage device is located so as to enable the low-temperature energy storage device to store cold; the high-low temperature test box enters a heating working condition cold energy storage mode, and at the moment, the low-temperature energy storage device is used as an evaporator to store cold energy in the low-temperature energy storage device;
3) If the internal temperature of the high-temperature type energy storage device is smaller than the external environment temperature of the box+the third preset value, and the internal temperature of the low-temperature type energy storage device is smaller than the third preset temperature, the branch where the outdoor heat exchanger is controlled to be conducted, and the branch where the high-temperature type energy storage device is located and the branch where the low-temperature type energy storage device is located are disconnected, namely, the high-temperature and low-temperature test box enters a conventional heat exchange mode of a heating working condition, at the moment, the outdoor heat exchanger is used as an evaporator, the internal temperature of the energy storage device is continuously monitored, and when the internal temperature of the energy storage device meets the condition 1) or 2), the operation is automatically switched to a corresponding mode.
The third preset value and the third preset temperature can be set according to actual conditions. The third preset value may be a positive value, a negative value or 0, and is generally smaller, for example, the third preset value is 2 ℃, -3 ℃ or 0 ℃. The third preset temperature is used for measuring whether the energy storage device needs to store energy during heating, for example, the third preset temperature is-20 ℃.
According to the embodiment, when the high-low temperature test box is switched from a low-temperature working condition to a high-temperature working condition, the on-off of the branch where the outdoor heat exchanger is located and the branch where the energy storage device is located is controlled according to the internal temperature of the energy storage device and the external environment temperature of the box, so that the high-low temperature test box enters a corresponding mode to operate, heat in the energy storage device is preferentially utilized, so that energy consumption is reduced, cold energy is stored in the energy storage device, and finally the outdoor heat exchanger is used for carrying out conventional heating work so as to achieve the target working condition temperature, energy loss during working condition switching is effectively utilized, and energy conservation and emission reduction are realized.
Further, if the foregoing condition 1) is satisfied, after the branch where the high-temperature energy storage device is controlled to be turned on and the branch where the outdoor heat exchanger is turned off and the branch where the low-temperature energy storage device is turned off, the method further includes: when the internal temperature of the high-temperature energy storage device is monitored to be smaller than the outside environment temperature of the box and the fourth preset value, stopping releasing heat by the high-temperature energy storage device, judging the internal temperature of the energy storage device again, namely, exiting the current mode, judging again, and particularly disconnecting a branch where the high-temperature energy storage device is located.
Wherein, the outside environment temperature+the third preset value > the outside environment temperature+the fourth preset value. The fourth preset value may be set according to actual conditions. The fourth preset value may be a positive value, a negative value or 0, for example, the fourth preset value is-20 ℃.
And taking the external environment temperature as a reference, the high-temperature energy storage device is considered to be suitable for controlling the heat release mode of the heating working condition when the internal temperature of the high-temperature energy storage device is higher than the external environment temperature of the tank. In view of the fact that the lower the temperature of the energy storage device is, the lower the heat exchange efficiency is, and the lower the temperature is, the compressor low-pressure protection is likely to occur, the present embodiment specifies the condition of exiting the heating operation heat release mode based on the fourth preset value. The third preset value and the fourth preset value can be freely adjusted according to actual use conditions, namely the mode is entered when the internal temperature of the high-temperature energy storage device is greater than or equal to the external environment temperature + -a ℃, and the mode is exited when the internal temperature of the high-temperature energy storage device is less than the external environment temperature + -b ℃.
According to the embodiment, the heating working condition heat release mode can be timely exited, so that the conditions of low heat exchange efficiency or low-voltage protection caused by low temperature of the high-temperature energy storage device are avoided.
Further, if the foregoing condition 2) is satisfied, after the branch where the low-temperature energy storage device is controlled to be turned on and the branch where the outdoor heat exchanger is turned off and the branch where the high-temperature energy storage device is turned off, the method further includes: when the internal temperature of the low-temperature energy storage device is monitored to be smaller than the fourth preset temperature, stopping the low-temperature energy storage device to store cold and judging the internal temperature of the energy storage device again, namely, exiting the current working mode and judging again, and particularly disconnecting the branch where the low-temperature energy storage device is located.
Wherein the fourth preset temperature is less than the third preset temperature. The fourth preset temperature may be set according to actual conditions. The fourth preset temperature is used for measuring whether the energy storage device stores energy during heating, for example, the fourth preset temperature is-30 ℃.
According to the embodiment, the heating working condition cold energy storage mode can be timely exited.
Considering that the higher the refrigerant flow ratio of the energy storage device is, the worse the heat exchange of the evaporation side of the air conditioning system is, the lower the suction superheat degree is, the liquid impact is generated when the suction superheat degree is negative, and the compressor is possibly damaged when the energy efficiency of the system is affected, therefore, after the branch where the low-temperature energy storage device is controlled to be conducted and the branch where the outdoor heat exchanger is disconnected from the branch where the high-temperature energy storage device is located, namely in the heating working condition cold energy storage mode, the method can further comprise: monitoring the suction superheat degree of an air conditioning system; when the air suction superheat degree is smaller than the air suction superheat degree lower limit value, controlling a branch circuit where the outdoor heat exchanger is positioned to be conducted, taking the outdoor heat exchanger as a main evaporator and taking the low-temperature energy storage device as a standby evaporator; and controlling the refrigerant flow ratio of the branch circuit where the outdoor heat exchanger is positioned and the branch circuit where the low-temperature energy storage device is positioned so as to ensure that the suction superheat degree is stabilized in a preset suction superheat degree range, wherein the suction superheat degree is improved by reducing the refrigerant flow ratio of the branch circuit where the low-temperature energy storage device is positioned.
The preset suction superheat degree range is [ suction superheat degree lower limit value, suction superheat degree upper limit value ], and can be set according to practical conditions, for example, the preset suction superheat degree range is [3 ℃,7 ℃). Suction superheat = suction temperature-evaporation temperature, which can be converted from the suction pressure of the air conditioning system. Specifically, when the suction superheat degree is smaller than the suction superheat degree lower limit value, reducing the valve opening of the branch where the low-temperature energy storage device is positioned and increasing the valve opening of the branch where the outdoor heat exchanger is positioned; when the air suction superheat degree is larger than the air suction superheat degree upper limit value, the valve opening of the branch where the low-temperature energy storage device is located is increased, and the valve opening of the branch where the outdoor heat exchanger is located is reduced.
According to the embodiment, in the heating working condition cold energy storage mode, the air suction superheat degree can be controlled in the preset air suction superheat degree range by adjusting the refrigerant flow ratio of the two paths of evaporators, so that liquid impact or compressor damage caused by too low air suction superheat degree is avoided.
(3) 1 energy storage device and is switched from a high temperature working condition to a low temperature working condition
Specifically, according to operating mode switching instruction and the inside temperature of energy memory, the break-make of the branch road that the outdoor heat exchanger is located and the branch road that energy memory is located is controlled to the outside heat exchanger, includes:
Judging the internal temperature of the energy storage device under the condition that the working condition switching instruction is switched from a high-temperature working condition to a low-temperature working condition;
if the internal temperature of the energy storage device is smaller than the first preset temperature, the branch where the outdoor heat exchanger is located is controlled to be disconnected and the branch where the energy storage device is located is controlled to be conducted, so that the energy storage device serves as a condenser, namely, the high-low temperature test box enters a refrigeration working condition heat storage mode, and at the moment, the energy storage device serves as the condenser to store heat in the energy storage device; when the internal temperature of the energy storage device is monitored to be greater than or equal to a second preset temperature, stopping the energy storage device as a condenser and judging the internal temperature of the energy storage device again, namely, exiting the current working mode and judging again, and particularly disconnecting a branch where the energy storage device is located; the second preset temperature is greater than the first preset temperature, and the first preset temperature and the second preset temperature are specifically referred to above and are not described herein again;
if the internal temperature of the energy storage device is greater than or equal to the first preset temperature, the branch where the outdoor heat exchanger is located is controlled to be conducted, and the branch where the energy storage device is located is disconnected, namely, the high-low temperature test box enters a conventional heat exchange mode under refrigeration working conditions, and at the moment, the outdoor heat exchanger serves as a condenser and the internal temperature of the energy storage device is continuously monitored.
According to the embodiment, when the high-low temperature test box is switched from a high-temperature working condition to a low-temperature working condition, the on-off of the branch where the outdoor heat exchanger is located and the branch where the energy storage device is located is controlled according to the internal temperature of the energy storage device, so that the high-low temperature test box enters a corresponding mode for operation, the energy loss during the switching of the high-low temperature working condition can be stored, and the energy waste is avoided.
Further, after the branch where the outdoor heat exchanger is controlled to be disconnected and the branch where the energy storage device is controlled to be connected, that is, in the cooling working condition heat storage mode, the method may further include: monitoring the exhaust temperature of the air conditioning system; when the exhaust temperature is higher than the upper limit value of the exhaust temperature, controlling a branch circuit where the outdoor heat exchanger is positioned to be conducted, taking the outdoor heat exchanger as a main condenser, and taking the energy storage device as a backup condenser; and controlling the refrigerant flow ratio of the branch circuit where the outdoor heat exchanger is positioned and the branch circuit where the energy storage device is positioned so as to enable the exhaust temperature to be stable in a preset exhaust temperature range, wherein the exhaust temperature is reduced by reducing the refrigerant flow ratio of the branch circuit where the energy storage device is positioned. Specifically, when the exhaust temperature is greater than the exhaust temperature upper limit value, reducing the valve opening of the branch where the energy storage device is positioned and increasing the valve opening of the branch where the outdoor heat exchanger is positioned; when the exhaust temperature is smaller than the lower limit value of the exhaust temperature, the valve opening of the branch where the energy storage device is located is increased, and the valve opening of the branch where the outdoor heat exchanger is located is reduced.
According to the embodiment, in the refrigeration working condition heat storage mode, the exhaust temperature can be controlled in the preset exhaust temperature range by adjusting the refrigerant flow ratio of the two paths of condensers, so that the damage of the compressor caused by the overhigh exhaust temperature is avoided.
(4) 1 energy storage device and is switched from a low temperature working condition to a high temperature working condition
Specifically, according to operating mode switching instruction and the inside temperature of energy memory, the break-make of the branch road that the outdoor heat exchanger is located and the branch road that energy memory is located is controlled to the outside heat exchanger, includes:
judging the internal temperature of the energy storage device under the condition that the working condition switching instruction is switched from a low-temperature working condition to a high-temperature working condition;
if the internal temperature of the energy storage device is greater than or equal to the third preset temperature, the branch where the outdoor heat exchanger is located is controlled to be disconnected and the branch where the energy storage device is located is controlled to be conducted, so that the energy storage device serves as an evaporator, namely, the high-low temperature test box enters a heating working condition cold energy storage mode, and at the moment, the energy storage device serves as the evaporator and stores cold energy in the energy storage device; when the internal temperature of the energy storage device is monitored to be smaller than the fourth preset temperature, stopping the energy storage device as an evaporator, judging the internal temperature of the energy storage device again, namely, exiting the current working mode, judging again, and particularly disconnecting a branch where the energy storage device is located; the fourth preset temperature is smaller than the third preset temperature, and specific reference is made to the third preset temperature and the fourth preset temperature, which are not described herein;
If the internal temperature of the energy storage device is smaller than the third preset temperature, the branch where the outdoor heat exchanger is located is controlled to be conducted, and the branch where the energy storage device is located is disconnected, namely, the high-low temperature test box enters a conventional heat exchange mode of heating working conditions, and at the moment, the outdoor heat exchanger serves as an evaporator and the internal temperature of the energy storage device is continuously monitored.
According to the embodiment, when the high-low temperature test box is switched from the low-temperature working condition to the high-temperature working condition, the on-off of the branch where the outdoor heat exchanger is located and the branch where the energy storage device is located is controlled according to the internal temperature of the energy storage device, so that the high-low temperature test box enters a corresponding mode for operation, the energy loss during the switching of the high-low temperature working condition can be stored, and the energy waste is avoided.
Further, after the branch where the outdoor heat exchanger is controlled to be disconnected and the branch where the energy storage device is controlled to be connected, that is, in the heating working condition cold energy storage mode, the method may further include: monitoring the suction superheat degree of an air conditioning system; when the air suction superheat degree is smaller than the air suction superheat degree lower limit value, controlling a branch circuit where the outdoor heat exchanger is positioned to be conducted, taking the outdoor heat exchanger as a main evaporator and taking the energy storage device as a standby evaporator; and controlling the refrigerant flow ratio of the branch circuit where the outdoor heat exchanger is positioned and the branch circuit where the energy storage device is positioned so as to ensure that the suction superheat degree is stabilized in a preset suction superheat degree range, wherein the suction superheat degree is improved by reducing the refrigerant flow ratio of the branch circuit where the energy storage device is positioned. Specifically, when the suction superheat degree is smaller than the suction superheat degree lower limit value, reducing the valve opening of the branch where the energy storage device is positioned and increasing the valve opening of the branch where the outdoor heat exchanger is positioned; when the air suction superheat degree is larger than the air suction superheat degree upper limit value, the valve opening of the branch where the energy storage device is located is increased, and the valve opening of the branch where the outdoor heat exchanger is located is reduced.
According to the embodiment, in the heating working condition cold energy storage mode, the air suction superheat degree can be controlled in the preset air suction superheat degree range by adjusting the refrigerant flow ratio of the two paths of evaporators, so that liquid impact or compressor damage caused by too low air suction superheat degree is avoided.
Example two
The above-described switching scheme of the high and low temperature test chamber operation is described below with reference to a specific embodiment, however, it should be noted that the specific embodiment is only for better illustrating the present application, and is not meant to be unduly limiting. The same or corresponding terms as those of the above embodiments are explained, and the present embodiment will not be repeated.
As shown in fig. 2, which is a cross-sectional view of the energy storage device, the energy storage device includes: the energy storage device comprises an energy storage device shell 10, a refrigerant pipeline 20 and a cold storage agent 30. The energy storage device housing 10 is used to store a coolant 30, and is covered with a thermal insulation material on the outside thereof to reduce cold/heat loss. The refrigerant pipe 20 is used for circulating a refrigerant to exchange heat with the cold storage agent 30, and the outer surface of the refrigerant pipe is provided with cooling fins to improve heat exchange efficiency. The coolant 30 may be glycol solution, and different concentrations of the coolant may be selected according to the temperature of use of the energy storage device. The glycol solution has the lowest freezing point at 66 percent concentration, can bear the temperature below minus 35 ℃ and is not solidified, and for a closed energy storage device, if an internal cold storage agent is solidified, the shell can be cracked; however, the higher the concentration of the glycol solution, the lower the specific heat capacity, and the poorer the cold storage effect. Therefore, the high temperature type energy storage device uses purified water as a cold storage agent, and the low temperature type energy storage device uses 66% glycol solution as a cold storage agent. If only 1 energy storage device is arranged in the high-low temperature test box, the high-temperature type and the low-temperature type are not distinguished, and the energy storage device uses glycol as a cold storage agent.
The following describes a method for switching the working conditions by taking a case of a high-low temperature test box including a heat pump system and 2 energy storage devices (specifically, 1 high-temperature energy storage device and 1 low-temperature energy storage device) as an example.
As shown in fig. 3 to 12, the high-low temperature test chamber includes: a heat pump system with a four-way valve and 2 energy storage devices. The heat pump system includes: a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, a throttle device 4, an indoor heat exchanger 5, an indoor fan 51, a third valve 31, and an outdoor fan 32.
The 2 energy storage devices are: the first energy storage device 6 and the second energy storage device 7, the first energy storage device 6 is a high-temperature energy storage device (stores heat during refrigeration and releases heat during heating), and the cold storage agent adopts purified water. The second energy storage device 7 is a low-temperature energy storage device (releasing cold energy during refrigeration and storing cold energy during heating), and the cold storage agent adopts 66% glycol solution.
The branch where the first energy storage device 6 is located is provided with a first valve 61, the branch where the second energy storage device 7 is located is provided with a second valve 71, and the branch where the outdoor heat exchanger 3 is located is provided with a third valve 31. By controlling the opening and closing of the first valve 61, the second valve 71, and the third valve 31, it is possible to control whether or not the first energy storage device 6, the second energy storage device 7, and the outdoor heat exchanger 3 participate in the refrigerant cycle. For example, the first valve 61, the second valve 71, and the third valve 31 may be electric two-way valves. Fig. 3 shows the flow direction of the refrigerant during cooling, and fig. 8 shows the flow direction of the refrigerant during heating.
Each energy storage device is provided with a temperature sensor for detecting the temperature of the cold storage agent, wherein the temperature of the cold storage agent in the first energy storage device 6 is T1, and the temperature of the cold storage agent in the second energy storage device 7 is T2. The high-low temperature test chamber is also provided with a sensor for detecting the environmental temperature T0 in the chamber and the environmental temperature T outside the chamber Outer part Exhaust temperature T of heat pump system Exhaust gas Suction temperature T of heat pump system Inhalation of air Is provided. The heat pump system is provided with a discharge pressure sensor and an evaporation pressure sensor and is used for monitoring the high pressure and the low pressure of the system in real time.
The high-low temperature test box can be integrated with a set of electric heating system for heating, and a set of humidifying system for adjusting humidity so as to meet the requirements of test working conditions. If the high-low temperature test box uses a single cooling system, electric heating is used in a heating working condition, energy is stored only in the cooling working condition, and heat can be used for other purposes (such as hot water preparation).
(1) When the inside of the high-low temperature test box needs to be switched from a high-temperature working condition to a low-temperature working condition, the control is carried out according to the following rules:
(1) when T2 is less than T Outer part When the high-low temperature test box enters a refrigerating condition cold energy release mode, as shown in fig. 4, the heat pump system operates the second energy storage device 7 as a condenser, and the cold energy in the second energy storage device 7 is released. When T2 is detected to be more than or equal to T Outer part At +20℃, the current mode was exited and the determination was repeated.
The external environment temperature is taken as a reference, and the second energy storage device 7 is considered to be suitable for the refrigeration working condition cold release mode when the temperature is lower than the external environment temperature. In practical application, the threshold value can be freely adjusted according to practical use conditions, namely T2 is less than T Outer part Entering a refrigeration working condition cold quantity release mode at +/-x ℃, wherein T2 is more than or equal to T Outer part And exiting the refrigeration working condition cold release mode at +/-y ℃ and carrying out the same follow-up.
(2) When T2 is greater than or equal to T Outer part And when T1 is less than 90 ℃, the high-low temperature test chamber enters a refrigerating working condition heat storage mode, as shown in fig. 5, the heat pump system operates the first energy storage device 6 as a condenser, and heat is stored in the first energy storage device 6. On the basis of this, when T is detected Exhaust gas At the temperature of more than 105 ℃, as shown in FIG. 6, the heat pump system uses the conventional outdoor heat exchanger 3 as a main condenser, and simultaneously uses the first energy storage device 6 as a backup condenser to continue to operate, and the opening degree of the first valve 61 and the third valve 31 is controlled to adjust the refrigerant flow ratio of the two-way condenser, so that T is calculated Exhaust gas Controlling the temperature to be 100-105 ℃. Specifically, the higher the refrigerant flow rate ratio of the branch where the energy storage device is located, the worse the heat exchange of the condensing side of the actual heat pump system is, T Exhaust gas The higher the discharge temperature, the more likely the compressor motor will be irreversibly damaged. When the temperature T1 is detected to be more than or equal to 100 ℃, the first energy storage device 6 is used for storing heat, the current mode is exited, and the judgment is carried out again.
(3) When T2 is greater than or equal to T Outer part And when T1 is more than or equal to 90 ℃, the high-low temperature test box enters a conventional heat exchange mode under refrigeration working conditions, as shown in FIG 7, at the moment, the heat pump system uses a conventional outdoor heat exchanger as a condenser, and simultaneously monitors T1 and T2 all the time, and automatically switches to a corresponding mode to control when the conditions (1) or (2) are satisfied.
(2) When the inside of the high-low temperature test box needs to be switched from a low-temperature working condition to a high-temperature working condition, the control is performed according to the following rules:
(1) when T1 is greater than or equal to T Outer part When the high-low temperature test chamber enters a heating working condition heat release mode, as shown in fig. 9, the heat pump system operates the first energy storage device 6 as an evaporator to release the first energy storageHeat in the device 6 can be provided. When T1 < T is detected Outer part At-20 ℃, the current mode is exited and the judgment is repeated.
Here, taking the external environment temperature as a reference, it is considered that the first energy storage device 6 is suitable for the heating working condition heat release mode when the temperature is higher than the external environment temperature. In practical application, the threshold value can be freely adjusted according to the practical use condition, namely T1 is more than or equal to T Outer part Entering a heating working condition heat release mode at + -a ℃, wherein T1 is less than T Outer part And (5) exiting the heating working condition heat release mode at the temperature of +/-b ℃ and carrying out the following similar matters.
(2) When T1<T Outer part And when the temperature T2 is more than or equal to minus 20 ℃, the high and low temperature test box enters a heating working condition cold energy storage mode, as shown in figure 10, the heat pump system operates the second energy storage device 7 as an evaporator, and cold energy is stored in the second energy storage device 7. On the basis, the evaporating temperature T can be converted according to the suction pressure of the heat pump system Evaporation When T is detected Inhalation of air -T Evaporation When the temperature is lower than 3 ℃, as shown in FIG. 11, the heat pump system uses a conventional outdoor heat exchanger as a main evaporator, and simultaneously uses the second energy storage device 7 as a standby evaporator to continue to operate, and the opening degree of the second valve 71 and the third valve 31 is controlled to adjust the refrigerant flow ratio of the two evaporators, so that T is calculated Inhalation of air -T Evaporation Controlling the temperature to be 3-7 ℃. Specifically, the higher the refrigerant flow ratio of the branch where the energy storage device is located, the worse the heat exchange of the evaporation side of the actual heat pump system, the lower the suction superheat degree, and when the suction superheat degree is negative, liquid impact is generated, so that the energy efficiency of the system is affected and the compressor is possibly damaged. When the temperature T2 is detected to be less than-30 ℃, the second energy storage device 7 is completely cooled, the current mode is exited, and the judgment is carried out again;
(3) When T1 is less than T Outer part And when T2 is less than-20 ℃, the high and low temperature test box enters a heating working condition conventional heat exchange mode, as shown in figure 12, at the moment, the heat pump system uses a conventional outdoor heat exchanger as an evaporator, and simultaneously monitors T1 and T2 all the time, and automatically switches to a corresponding mode to control when the conditions (1) or (2) are satisfied.
Through the control scheme, the high-low temperature test box can store originally wasted cold energy/heat into the energy storage device when working conditions are switched, and the energy storage device is used when being switched next time, so that the energy efficiency of the system in the whole life cycle is improved, and the energy conservation and the emission reduction are realized.
The structural form, the number and the relative positions of the energy storage devices in the air conditioning system can be adjusted according to actual requirements.
Aiming at the problem that the high-low temperature test box has higher energy consumption during working condition switching, the embodiment provides the high-low temperature test box with the energy storage device, when the working condition of the high-low temperature test is switched, the heat/cold in the energy storage device is preferentially utilized to reduce the energy consumption, then the cold/heat is stored in the energy storage device, and finally the outdoor heat exchanger is used for conventional refrigeration/heating work to reach the target working condition temperature. The energy loss during switching of the high-low temperature working conditions is effectively utilized, and the energy loss is stored for use during the next switching.
Example III
Based on the same inventive concept, the embodiment provides a working condition switching device for a high-low temperature test chamber, which can be used for realizing the working condition switching method for the high-low temperature test chamber. The high-low temperature test box working condition switching device can be realized through software and/or hardware, and can be generally integrated in a controller of the high-low temperature test box.
The high-low temperature test chamber comprises: the air conditioning system comprises an air conditioning system and at least one energy storage device, wherein a cold storage agent and a refrigerant pipeline are arranged in the energy storage device, the energy storage device is connected with an outdoor heat exchanger in the air conditioning system in parallel through the refrigerant pipeline, and both a branch where the outdoor heat exchanger is located and a branch where the energy storage device is located are on-off controllable.
Fig. 13 is a block diagram of a working condition switching device for a high and low temperature test chamber according to a third embodiment of the present invention, as shown in fig. 13, where the working condition switching device for a high and low temperature test chamber includes:
the monitoring module 1301 is configured to monitor an internal temperature of the energy storage device in response to a working condition switching instruction;
the control module 1302 is configured to control the air conditioning system to operate according to a refrigerant flow direction corresponding to the working condition switching instruction, and control on-off of the branch where the outdoor heat exchanger is located and the branch where the energy storage device is located according to the working condition switching instruction, the number of the energy storage devices and the internal temperature of the energy storage device.
Optionally, the control module 1302 includes:
the first control unit is used for controlling the air conditioning system to operate according to the flow direction of the refrigerant for refrigeration if the working condition switching instruction is that the working condition is switched from a high-temperature working condition to a low-temperature working condition;
and the second control unit is used for controlling the air conditioning system to operate according to the flow direction of the heated refrigerant if the working condition switching instruction is that the working condition is switched from the low-temperature working condition to the high-temperature working condition.
Optionally, the control module 1302 includes:
the third control unit is used for determining a high-temperature energy storage device and a low-temperature energy storage device in all the energy storage devices if the number of the energy storage devices is 2 or more, and controlling the on-off of a branch where the outdoor heat exchanger is located and a branch where the energy storage device is located according to the working condition switching instruction, the internal temperature of the energy storage device and the external environment temperature of the tank;
and the fourth control unit is used for controlling the on-off of the branch where the outdoor heat exchanger is located and the branch where the energy storage device is located according to the working condition switching instruction and the internal temperature of the energy storage device if the number of the energy storage devices is 1.
Optionally, the third control unit includes:
the first judging subunit is used for judging the internal temperature of the energy storage device under the condition that the working condition switching instruction is switched from a high-temperature working condition to a low-temperature working condition;
The first control subunit is used for controlling the branch circuit where the low-temperature energy storage device is located to be conducted if the internal temperature of the low-temperature energy storage device is smaller than the external environment temperature plus a first preset value, and the branch circuit where the outdoor heat exchanger is located and the branch circuit where the high-temperature energy storage device is located are disconnected so as to enable the low-temperature energy storage device to release cold energy;
the second control subunit is used for controlling the branch circuit where the high-temperature energy storage device is located to be conducted if the internal temperature of the low-temperature energy storage device is greater than or equal to the external environment temperature plus the first preset value and the internal temperature of the high-temperature energy storage device is less than the first preset temperature, and the branch circuit where the outdoor heat exchanger is located and the branch circuit where the low-temperature energy storage device is located are disconnected so that the high-temperature energy storage device stores heat;
and the third control subunit is used for controlling the branch circuit where the outdoor heat exchanger is located to be conducted if the internal temperature of the low-temperature energy storage device is greater than or equal to the external environment temperature plus the first preset value and the internal temperature of the high-temperature energy storage device is greater than or equal to the first preset temperature, disconnecting the branch circuit where the high-temperature energy storage device is located and the branch circuit where the low-temperature energy storage device is located, and continuously monitoring the internal temperature of the energy storage device.
Optionally, the first control subunit is further configured to: after the branch circuit where the low-temperature energy storage device is located is controlled to be conducted and the branch circuit where the outdoor heat exchanger is located and the branch circuit where the high-temperature energy storage device is located are disconnected, stopping the low-temperature energy storage device from releasing cold energy and judging the internal temperature of the energy storage device again when the internal temperature of the low-temperature energy storage device is monitored to be greater than or equal to the external environment temperature of the box plus a second preset value; wherein, the outside environment temperature+the first preset value is less than the outside environment temperature+the second preset value.
Optionally, the second control subunit is further configured to: after the branch where the high-temperature energy storage device is controlled to be conducted and the branch where the outdoor heat exchanger is and the branch where the low-temperature energy storage device is disconnected, stopping the high-temperature energy storage device to store heat and judging the internal temperature of the energy storage device again when the internal temperature of the high-temperature energy storage device is monitored to be greater than or equal to a second preset temperature; wherein the second preset temperature is greater than the first preset temperature.
Optionally, the third control unit further includes:
the first monitoring subunit is used for monitoring the exhaust temperature of the air conditioning system after the branch where the high-temperature energy storage device is controlled to be conducted and the branch where the outdoor heat exchanger is disconnected from the branch where the low-temperature energy storage device is located;
the first exhaust temperature control subunit is used for controlling the branch circuit where the outdoor heat exchanger is to be conducted when the exhaust temperature is greater than the exhaust temperature upper limit value, taking the outdoor heat exchanger as a main condenser and taking the high-temperature energy storage device as a backup condenser; and controlling the refrigerant flow ratio of the branch where the outdoor heat exchanger is located and the branch where the high-temperature energy storage device is located so as to enable the exhaust temperature to be stable in a preset exhaust temperature range, wherein the exhaust temperature is reduced by reducing the refrigerant flow ratio of the branch where the high-temperature energy storage device is located.
Optionally, the third control unit includes:
the second judging subunit is used for judging the internal temperature of the energy storage device under the condition that the working condition switching instruction is switched from a low-temperature working condition to a high-temperature working condition;
the fourth control subunit is used for controlling the branch circuit where the high-temperature energy storage device is located to be conducted if the internal temperature of the high-temperature energy storage device is greater than or equal to the outside environment temperature plus a third preset value, and the branch circuit where the outdoor heat exchanger is located and the branch circuit where the low-temperature energy storage device is located are disconnected so that the high-temperature energy storage device releases heat;
the fifth control subunit is configured to control, if the internal temperature of the high-temperature energy storage device is less than the external environment temperature+a third preset value and the internal temperature of the low-temperature energy storage device is greater than or equal to the third preset temperature, the branch where the low-temperature energy storage device is located to be turned on, and the branch where the outdoor heat exchanger is located and the branch where the high-temperature energy storage device is located are both turned off, so that the low-temperature energy storage device stores cold energy;
and the sixth control subunit is used for controlling the branch circuit where the outdoor heat exchanger is to be conducted if the internal temperature of the high-temperature energy storage device is less than the external environment temperature+the third preset value and the internal temperature of the low-temperature energy storage device is less than the third preset temperature, disconnecting the branch circuit where the high-temperature energy storage device is to be disconnected from the branch circuit where the low-temperature energy storage device is to be located, and continuously monitoring the internal temperature of the energy storage device.
Optionally, the fourth control subunit is further configured to: after a branch where the high-temperature energy storage device is controlled to be conducted and both the branch where the outdoor heat exchanger is and the branch where the low-temperature energy storage device is disconnected, stopping releasing heat by the high-temperature energy storage device and judging the internal temperature of the energy storage device again when the internal temperature of the high-temperature energy storage device is monitored to be smaller than the external case temperature plus a fourth preset value; wherein, the outside environment temperature+the third preset value > the outside environment temperature+the fourth preset value.
Optionally, the fifth control subunit is further configured to: after the branch where the low-temperature energy storage device is controlled to be conducted and the branch where the outdoor heat exchanger is and the branch where the high-temperature energy storage device is disconnected, stopping the low-temperature energy storage device to store cold and judging the internal temperature of the energy storage device again when the internal temperature of the low-temperature energy storage device is monitored to be smaller than a fourth preset temperature; wherein the fourth preset temperature is less than the third preset temperature.
Optionally, the fourth control unit further includes:
the second monitoring subunit is used for monitoring the suction superheat degree of the air conditioning system after the branch where the low-temperature energy storage device is controlled to be conducted and the branch where the outdoor heat exchanger is disconnected from the branch where the high-temperature energy storage device is;
The first air suction superheat degree control subunit is used for controlling the branch circuit where the outdoor heat exchanger is to be conducted when the air suction superheat degree is smaller than the air suction superheat degree lower limit value, taking the outdoor heat exchanger as a main evaporator and taking the low-temperature energy storage device as a standby evaporator; and controlling the refrigerant flow ratio of the branch circuit where the outdoor heat exchanger is located and the branch circuit where the low-temperature energy storage device is located so as to enable the suction superheat degree to be stable in a preset suction superheat degree range, wherein the suction superheat degree is improved by reducing the refrigerant flow ratio of the branch circuit where the low-temperature energy storage device is located.
Optionally, the fourth control unit includes:
the third judging subunit is used for judging the internal temperature of the energy storage device under the condition that the working condition switching instruction is switched from a high-temperature working condition to a low-temperature working condition;
a seventh control subunit, configured to control, if the internal temperature of the energy storage device is less than a first preset temperature, to disconnect a branch where the outdoor heat exchanger is located and to connect the branch where the energy storage device is located, so that the energy storage device serves as a condenser; when the internal temperature of the energy storage device is monitored to be greater than or equal to a second preset temperature, stopping the energy storage device as a condenser and judging the internal temperature of the energy storage device again; wherein the second preset temperature is greater than the first preset temperature;
And the eighth control subunit is used for controlling the branch circuit where the outdoor heat exchanger is located to be conducted and the branch circuit where the energy storage device is located to be disconnected if the internal temperature of the energy storage device is greater than or equal to the first preset temperature, and continuously monitoring the internal temperature of the energy storage device.
Optionally, the fourth control unit further includes:
the third monitoring subunit is used for monitoring the exhaust temperature of the air conditioning system after controlling the branch where the outdoor heat exchanger is located to be disconnected and the branch where the energy storage device is located to be connected;
the second exhaust temperature control subunit is used for controlling the branch circuit where the outdoor heat exchanger is to be conducted when the exhaust temperature is greater than the exhaust temperature upper limit value, taking the outdoor heat exchanger as a main condenser and taking the energy storage device as a backup condenser; and controlling the refrigerant flow ratio of the branch circuit where the outdoor heat exchanger is located and the branch circuit where the energy storage device is located so as to enable the exhaust temperature to be stable in a preset exhaust temperature range, wherein the exhaust temperature is reduced by reducing the refrigerant flow ratio of the branch circuit where the energy storage device is located.
Optionally, the fourth control unit includes:
the fourth judging subunit is used for judging the internal temperature of the energy storage device under the condition that the working condition switching instruction is switched from a low-temperature working condition to a high-temperature working condition;
A ninth control subunit, configured to control, if the internal temperature of the energy storage device is greater than or equal to a third preset temperature, to disconnect a branch where the outdoor heat exchanger is located and to connect the branch where the energy storage device is located, so that the energy storage device is used as an evaporator; when the internal temperature of the energy storage device is monitored to be smaller than a fourth preset temperature, stopping the energy storage device as an evaporator and judging the internal temperature of the energy storage device again; wherein the fourth preset temperature is less than the third preset temperature;
and the tenth control subunit is used for controlling the branch circuit where the outdoor heat exchanger is located to be conducted and the branch circuit where the energy storage device is located to be disconnected if the internal temperature of the energy storage device is smaller than a third preset temperature, and continuously monitoring the internal temperature of the energy storage device.
Optionally, the fourth control unit further includes:
the fourth monitoring subunit is used for monitoring the suction superheat degree of the air conditioning system after controlling the branch where the outdoor heat exchanger is located to be disconnected and the branch where the energy storage device is located to be connected;
the second air suction superheat degree control subunit is used for controlling the branch circuit where the outdoor heat exchanger is to be conducted when the air suction superheat degree is smaller than the air suction superheat degree lower limit value, taking the outdoor heat exchanger as a main evaporator and taking the energy storage device as a standby evaporator; and controlling the refrigerant flow ratio of the branch circuit where the outdoor heat exchanger is located and the branch circuit where the energy storage device is located so as to enable the suction superheat degree to be stable in a preset suction superheat degree range, wherein the suction superheat degree is improved by reducing the refrigerant flow ratio of the branch circuit where the energy storage device is located.
Optionally, pure water is used as the cold storage agent in the high-temperature energy storage device, and an ethylene glycol solution is used as the cold storage agent in the low-temperature energy storage device.
The working condition switching device for the high-low temperature test box can execute the working condition switching method for the high-low temperature test box provided by the embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method. Technical details which are not described in detail in the embodiment of the invention can be seen in the working condition switching method of the high-low temperature test chamber provided by the embodiment of the invention.
Example IV
The embodiment provides a high-low temperature test chamber, including: the embodiment of the invention provides a working condition switching device for a high-low temperature test box.
Example five
The present embodiment provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the method according to the embodiments of the present invention.
Example six
The present embodiment provides a computer device including: memory, a processor and a computer program stored on the memory and executable on the processor, which processor implements the steps of the method according to the embodiments of the invention when the computer program is executed.
The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on this understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (19)
1. A working condition switching method of a high-low temperature test box is characterized in that the high-low temperature test box comprises the following steps: the air conditioning system comprises an air conditioning system and at least one energy storage device, wherein a cold storage agent and a refrigerant pipeline are arranged in the energy storage device, the energy storage device is connected with an outdoor heat exchanger in the air conditioning system in parallel through the refrigerant pipeline, and both a branch circuit where the outdoor heat exchanger is located and a branch circuit where the energy storage device is located are controllable in on-off; the method comprises the following steps:
monitoring the internal temperature of the energy storage device in response to a working condition switching instruction;
and controlling the air conditioning system to operate according to the refrigerant flow direction corresponding to the working condition switching instruction, and controlling the on-off of the branch where the outdoor heat exchanger is located and the branch where the energy storage device is located according to the working condition switching instruction, the number of the energy storage devices and the internal temperature of the energy storage devices.
2. The method of claim 1, wherein controlling the air conditioning system to operate in accordance with a refrigerant flow direction corresponding to the operating condition switching command comprises:
if the working condition switching instruction is from a high-temperature working condition to a low-temperature working condition, controlling the air conditioning system to operate according to the flow direction of the refrigerating refrigerant;
and if the working condition switching instruction is that the working condition is switched from the low-temperature working condition to the high-temperature working condition, controlling the air conditioning system to operate according to the flow direction of the heated refrigerant.
3. The method of claim 1, wherein controlling the switching of the branch circuit where the outdoor heat exchanger is located and the branch circuit where the energy storage device is located according to the operating mode switching instruction, the number of the energy storage devices and the internal temperature of the energy storage devices comprises:
if the number of the energy storage devices is 2 or more, determining a high-temperature energy storage device and a low-temperature energy storage device in all the energy storage devices, and controlling the on-off of a branch where the outdoor heat exchanger is located and a branch where the energy storage device is located according to the working condition switching instruction, the internal temperature of the energy storage device and the external environment temperature of the tank;
and if the number of the energy storage devices is 1, controlling the on-off of the branch where the outdoor heat exchanger is located and the branch where the energy storage devices are located according to the working condition switching instruction and the internal temperature of the energy storage devices.
4. The method of claim 3, wherein controlling the switching of the branch circuit in which the outdoor heat exchanger is located and the branch circuit in which the energy storage device is located according to the operating mode switching command, the internal temperature of the energy storage device, and the outside environment temperature comprises:
judging the internal temperature of the energy storage device under the condition that the working condition switching instruction is from a high-temperature working condition to a low-temperature working condition;
if the internal temperature of the low-temperature energy storage device is smaller than the external environment temperature of the box and the first preset value, controlling the branch circuit where the low-temperature energy storage device is located to be conducted, and disconnecting the branch circuit where the outdoor heat exchanger is located and the branch circuit where the high-temperature energy storage device is located so as to enable the low-temperature energy storage device to release cold energy;
if the internal temperature of the low-temperature energy storage device is greater than or equal to the outside environment temperature plus a first preset value and the internal temperature of the high-temperature energy storage device is less than the first preset temperature, controlling the branch where the high-temperature energy storage device is located to be conducted, and disconnecting the branch where the outdoor heat exchanger is located and the branch where the low-temperature energy storage device is located so that the high-temperature energy storage device stores heat;
if the internal temperature of the low-temperature energy storage device is greater than or equal to the outside environment temperature plus the first preset value and the internal temperature of the high-temperature energy storage device is greater than or equal to the first preset temperature, the branch circuit where the outdoor heat exchanger is located is controlled to be conducted, the branch circuit where the high-temperature energy storage device is located and the branch circuit where the low-temperature energy storage device is located are disconnected, and the internal temperature of the energy storage device is continuously monitored.
5. The method of claim 4, further comprising, after controlling the branch of the low temperature energy storage device to be on and the branch of the outdoor heat exchanger and the branch of the high temperature energy storage device to be off:
when the internal temperature of the low-temperature energy storage device is monitored to be greater than or equal to the outside environment temperature of the tank plus a second preset value, stopping the low-temperature energy storage device from releasing cold and judging the internal temperature of the energy storage device again;
wherein, the outside environment temperature+the first preset value is less than the outside environment temperature+the second preset value.
6. The method of claim 4, further comprising, after controlling the branch of the high temperature energy storage device to be on and the branch of the outdoor heat exchanger and the branch of the low temperature energy storage device to be off:
when the internal temperature of the high-temperature energy storage device is monitored to be greater than or equal to a second preset temperature, stopping the high-temperature energy storage device to store heat and judging the internal temperature of the energy storage device again;
wherein the second preset temperature is greater than the first preset temperature.
7. The method of claim 4, further comprising, after controlling the branch of the high temperature energy storage device to be on and the branch of the outdoor heat exchanger and the branch of the low temperature energy storage device to be off:
Monitoring an exhaust temperature of the air conditioning system;
when the exhaust temperature is higher than the exhaust temperature upper limit value, controlling a branch circuit where the outdoor heat exchanger is located to be conducted, taking the outdoor heat exchanger as a main condenser, and taking the high-temperature energy storage device as a backup condenser;
and controlling the refrigerant flow ratio of the branch circuit where the outdoor heat exchanger is positioned and the branch circuit where the high-temperature energy storage device is positioned so as to enable the exhaust temperature to be stable in a preset exhaust temperature range, wherein the exhaust temperature is reduced by reducing the refrigerant flow ratio of the branch circuit where the high-temperature energy storage device is positioned.
8. The method of claim 3, wherein controlling the switching of the branch circuit in which the outdoor heat exchanger is located and the branch circuit in which the energy storage device is located according to the operating mode switching command, the internal temperature of the energy storage device, and the outside environment temperature comprises:
judging the internal temperature of the energy storage device under the condition that the working condition switching instruction is from a low-temperature working condition to a high-temperature working condition;
if the internal temperature of the high-temperature energy storage device is greater than or equal to the outside environment temperature plus a third preset value, controlling the branch where the high-temperature energy storage device is located to be conducted, and disconnecting the branch where the outdoor heat exchanger is located and the branch where the low-temperature energy storage device is located so as to enable the high-temperature energy storage device to release heat;
If the internal temperature of the high-temperature energy storage device is smaller than the external environment temperature of the box and the third preset value, and the internal temperature of the low-temperature energy storage device is larger than or equal to the third preset temperature, controlling the branch circuit where the low-temperature energy storage device is located to be conducted, and disconnecting the branch circuit where the outdoor heat exchanger is located and the branch circuit where the high-temperature energy storage device is located so as to enable the low-temperature energy storage device to store cold;
if the internal temperature of the high-temperature energy storage device is smaller than the outside environment temperature of the box and the third preset value, and the internal temperature of the low-temperature energy storage device is smaller than the third preset temperature, the branch where the outdoor heat exchanger is located is controlled to be conducted, the branch where the high-temperature energy storage device is located and the branch where the low-temperature energy storage device is located are disconnected, and the internal temperature of the energy storage device is continuously monitored.
9. The method of claim 8, further comprising, after controlling the branch of the high temperature energy storage device to be on and the branch of the outdoor heat exchanger and the branch of the low temperature energy storage device to be off:
when the internal temperature of the high-temperature energy storage device is monitored to be smaller than the outside environment temperature plus a fourth preset value, stopping releasing heat by the high-temperature energy storage device and judging the internal temperature of the energy storage device again;
Wherein, the outside environment temperature+the third preset value > the outside environment temperature+the fourth preset value.
10. The method of claim 8, further comprising, after controlling the branch of the low temperature energy storage device to be on and the branch of the outdoor heat exchanger and the branch of the high temperature energy storage device to be off:
when the internal temperature of the low-temperature energy storage device is monitored to be smaller than a fourth preset temperature, stopping the low-temperature energy storage device to store cold energy and judging the internal temperature of the energy storage device again;
wherein the fourth preset temperature is less than the third preset temperature.
11. The method of claim 8, further comprising, after controlling the branch of the low temperature energy storage device to be on and the branch of the outdoor heat exchanger and the branch of the high temperature energy storage device to be off:
monitoring the suction superheat degree of the air conditioning system;
when the suction superheat degree is smaller than the suction superheat degree lower limit value, controlling a branch where the outdoor heat exchanger is located to be conducted, taking the outdoor heat exchanger as a main evaporator and taking the low-temperature energy storage device as a standby evaporator;
and controlling the refrigerant flow ratio of the branch circuit where the outdoor heat exchanger is positioned and the branch circuit where the low-temperature energy storage device is positioned so as to ensure that the suction superheat degree is stabilized in a preset suction superheat degree range, wherein the suction superheat degree is improved by reducing the refrigerant flow ratio of the branch circuit where the low-temperature energy storage device is positioned.
12. The method of claim 3, wherein controlling the switching of the branch where the outdoor heat exchanger is located and the branch where the energy storage device is located according to the operating mode switching instruction and the internal temperature of the energy storage device comprises:
judging the internal temperature of the energy storage device under the condition that the working condition switching instruction is from a high-temperature working condition to a low-temperature working condition;
if the internal temperature of the energy storage device is smaller than a first preset temperature, the branch where the outdoor heat exchanger is located is controlled to be disconnected and the branch where the energy storage device is located is controlled to be conducted, so that the energy storage device serves as a condenser; when the internal temperature of the energy storage device is monitored to be greater than or equal to a second preset temperature, stopping the energy storage device as a condenser and judging the internal temperature of the energy storage device again; wherein the second preset temperature is greater than the first preset temperature;
and if the internal temperature of the energy storage device is greater than or equal to the first preset temperature, controlling the branch circuit where the outdoor heat exchanger is located to be conducted, disconnecting the branch circuit where the energy storage device is located, and continuously monitoring the internal temperature of the energy storage device.
13. The method of claim 12, further comprising, after controlling the branch of the outdoor heat exchanger to be off and the branch of the energy storage device to be on:
Monitoring an exhaust temperature of the air conditioning system;
when the exhaust temperature is higher than the exhaust temperature upper limit value, controlling a branch circuit where the outdoor heat exchanger is located to be conducted, taking the outdoor heat exchanger as a main condenser, and taking the energy storage device as a backup condenser;
and controlling the refrigerant flow ratio of the branch circuit where the outdoor heat exchanger is positioned and the branch circuit where the energy storage device is positioned so as to enable the exhaust temperature to be stable in a preset exhaust temperature range, wherein the exhaust temperature is reduced by reducing the refrigerant flow ratio of the branch circuit where the energy storage device is positioned.
14. The method of claim 3, wherein controlling the switching of the branch where the outdoor heat exchanger is located and the branch where the energy storage device is located according to the operating mode switching instruction and the internal temperature of the energy storage device comprises:
judging the internal temperature of the energy storage device under the condition that the working condition switching instruction is from a low-temperature working condition to a high-temperature working condition;
if the internal temperature of the energy storage device is greater than or equal to a third preset temperature, the branch where the outdoor heat exchanger is located is controlled to be disconnected and the branch where the energy storage device is located is controlled to be conducted, so that the energy storage device serves as an evaporator; when the internal temperature of the energy storage device is monitored to be smaller than a fourth preset temperature, stopping the energy storage device as an evaporator and judging the internal temperature of the energy storage device again; wherein the fourth preset temperature is less than the third preset temperature;
And if the internal temperature of the energy storage device is smaller than the third preset temperature, controlling the branch circuit where the outdoor heat exchanger is located to be conducted, disconnecting the branch circuit where the energy storage device is located, and continuously monitoring the internal temperature of the energy storage device.
15. The method of claim 14, further comprising, after controlling the branch of the outdoor heat exchanger to be off and the branch of the energy storage device to be on:
monitoring the suction superheat degree of the air conditioning system;
when the suction superheat degree is smaller than the suction superheat degree lower limit value, controlling a branch where the outdoor heat exchanger is located to be conducted, taking the outdoor heat exchanger as a main evaporator and taking the energy storage device as a standby evaporator;
and controlling the refrigerant flow ratio of the branch circuit where the outdoor heat exchanger is positioned and the branch circuit where the energy storage device is positioned so as to enable the suction superheat degree to be stable in a preset suction superheat degree range, wherein the suction superheat degree is improved by reducing the refrigerant flow ratio of the branch circuit where the energy storage device is positioned.
16. The method according to any one of claims 3 to 11, wherein the cold storage agent inside the high temperature energy storage device uses purified water and the cold storage agent inside the low temperature energy storage device uses a glycol solution.
17. High low temperature test box operating mode auto-change over device, its characterized in that, high low temperature test box includes: the air conditioning system comprises an air conditioning system and at least one energy storage device, wherein a cold storage agent and a refrigerant pipeline are arranged in the energy storage device, the energy storage device is connected with an outdoor heat exchanger in the air conditioning system in parallel through the refrigerant pipeline, and both a branch circuit where the outdoor heat exchanger is located and a branch circuit where the energy storage device is located are controllable in on-off; the working condition switching device of the high-low temperature test chamber comprises:
the monitoring module is used for responding to the working condition switching instruction and monitoring the internal temperature of the energy storage device;
the control module is used for controlling the air conditioning system to operate according to the refrigerant flow direction corresponding to the working condition switching instruction, and controlling the on-off of the branch where the outdoor heat exchanger is located and the branch where the energy storage device is located according to the working condition switching instruction, the number of the energy storage devices and the internal temperature of the energy storage devices.
18. A high and low temperature test chamber, comprising: the high and low temperature test chamber operating condition switching device of claim 17.
19. A non-transitory computer readable storage medium having stored thereon a computer program, characterized in that the computer program when executed by a processor implements the steps of the method of any of claims 1 to 16.
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