CN111473542A - Cold and heat adjusting system and method suitable for single air source heat pump unit - Google Patents
Cold and heat adjusting system and method suitable for single air source heat pump unit Download PDFInfo
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- CN111473542A CN111473542A CN202010336774.7A CN202010336774A CN111473542A CN 111473542 A CN111473542 A CN 111473542A CN 202010336774 A CN202010336774 A CN 202010336774A CN 111473542 A CN111473542 A CN 111473542A
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- 238000000034 method Methods 0.000 title abstract description 12
- 239000007788 liquid Substances 0.000 claims abstract description 26
- 238000001816 cooling Methods 0.000 claims abstract description 16
- 230000033228 biological regulation Effects 0.000 claims abstract description 15
- 239000007921 spray Substances 0.000 claims abstract description 11
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 5
- 238000010438 heat treatment Methods 0.000 description 11
- 238000001704 evaporation Methods 0.000 description 7
- 230000008020 evaporation Effects 0.000 description 7
- 239000003507 refrigerant Substances 0.000 description 6
- 230000001105 regulatory effect Effects 0.000 description 5
- 230000008859 change Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
- F25B41/26—Disposition of valves, e.g. of on-off valves or flow control valves of fluid flow reversing valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Fluid Mechanics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a cold and heat regulation system and a cold and heat regulation method applicable to a single air source heat pump unit in the technical field of air source heat pump energy regulation, wherein a flooded evaporator is connected with a compressor through a pipeline, the other end of a spray cooling pipeline is connected with a bidirectional liquid storage tank, a four-way reversing valve is arranged on a connecting pipeline of the compressor, the compressor is respectively connected with an air-cooled fin type condenser and a gas-liquid separator through the four-way reversing valve, and the connecting pipeline of the gas-liquid separator is connected with the compressor through a hot gas bypass pipeline The investment cost is less, and the host has greater popularization value in the industry.
Description
Technical Field
The invention relates to the technical field of energy regulation of air source heat pumps, in particular to a cold and hot regulation system and a cold and hot regulation method suitable for a single air source heat pump unit.
Background
The matching operation of the heating capacity of the air source unit and the heat consumption capacity of the building is crucial to the energy-saving operation of a refrigerating and heating system. When the air source system operates at the temperature higher than the balance point, the heating capacity of the air source unit is far greater than the heat consumption of the building, which requires effective adjustment of the heating capacity of the air source unit, so as to reduce the energy consumption waste in the operation of the air source unit.
Early energy regulation approaches dominated staged energy regulation. In the refrigerating and heating system, several air source units are used, and when the indoor load is reduced or the water outlet temperature reaches the set value, some air source units are stopped automatically to realize stepped regulation. In order to avoid the phenomenon of uneven wear of each air source compressor caused by the long-term working state of the compressor started by the first air source, the control system of the air source unit must adjust the running time of each compressor, so that each compressor can be uniformly worn. The starting current of the air source compressor is generally large, the impact on a power grid can be generated when the air source compressor is started and stopped too frequently, the service life of the compressor can be indirectly shortened, and the graded energy adjustment can not well realize that the heating capacity of the air source unit can be accurately and synchronously adjusted along with the heat loss of a building and the change of the outdoor air temperature, so that the requirements of adapting to different heat loads can be met only under the condition of adopting flexible adjustment of the variable capacity of the air source compressor, the heating coefficient of the air source and the performance coefficient of a heating season are improved, and the impact on the power grid and the fluctuation of the indoor temperature caused by starting and stopping of the air source compressor are reduced. From the viewpoint of energy saving and comfort, the flexible control with variable capacity has obvious advantages over the fixed-speed graded start-stop control.
There are two kinds of variable capacity compressors commonly used at present, namely a variable frequency compressor and a digital scroll compressor. In the air source unit, one variable-capacity compressor and a plurality of constant-speed compressors are combined, so that continuous energy adjustment of the large-capacity unit can be realized, the service life of the unit can be prolonged, the comfort of a room is improved, and certain effects of reducing noise are achieved.
The two common variable capacitance adjusting means have the following problems respectively: 1. the digital scroll compressor has high requirement on automatic control, and theoretically, the adjustable power range of the digital scroll compressor is 10-100%. However, the heat inside the compressor needs to be taken away by working medium circulation, if the opening degree of the valve is very small, the total working medium flow is possibly insufficient due to 10% of loading capacity, so that the temperature inside the compressor is raised to cause self-protection action (the compressor stops working), the control is singly and simply carried out according to the loading capacity and the suction pressure, stepless power regulation is difficult to realize, and the cost is high; 2. the variable frequency compressor is adopted, and is a compressor which has constant relative rotating speed, and the rotating speed of the compressor is continuously adjusted within a certain range through a control mode or means, so that the output energy can be continuously changed; however, the working frequency of the inverter compressor is generally in the range of 30-130 Hz, and for a unit with a large capacity, the phenomenon that the cooling and heating are larger than the cooling and heating demand still occurs when the load is very small, and the cost of the inverter compressor is high. Therefore, a cold and hot adjusting system and an adjusting method suitable for a single air source heat pump unit are provided.
Disclosure of Invention
The invention aims to provide a cold and heat regulating system and a cold and heat regulating method suitable for a single air source heat pump unit, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a be applicable to cold and hot governing system of single air source heat pump unit, includes the flooded evaporator, the flooded evaporator passes through the pipeline and is connected with the compressor, the sunction inlet and the hydrojet cooling line one end of compressor are connected, the hydrojet cooling line other end is connected with two-way liquid storage pot, be provided with the cross-way reversing valve on the connecting line of compressor, the compressor passes through the cross-way reversing valve and is connected with air-cooled finned condenser and vapour and liquid separator respectively, vapour and liquid separator's connecting line passes through the steam bypass pipeline and is connected with the compressor.
Furthermore, an electronic expansion valve is arranged on a circulating pipeline of the bidirectional liquid storage tank, the air-cooled finned condenser is connected with the flooded evaporator through a pipeline, and the electronic expansion valve is arranged on the pipeline.
Furthermore, the gas-liquid separator is communicated with a spray liquid cooling pipeline, and electromagnetic valves are arranged on the spray liquid cooling pipeline and the hot gas bypass pipeline.
Compared with the prior art, the invention has the beneficial effects that: the invention changes the technical defects of various energy adjusting means such as air suction throttling, compressor cylinder unloading, compressor starting and stopping, compressor motor speed changing and the like in the existing market through little cost, so that a single air source heat pump can realize low-cost energy adjustment, provides a host with more energy-saving operation and less investment cost for small-scale buildings, and has great popularization value in the industry.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention;
FIG. 2 is a schematic diagram of the conditioning method of the present invention.
The drawings are for illustrative purposes only and are not to be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the invention provides a cold and heat regulating system suitable for a single air source heat pump unit, comprising a flooded evaporator, the flooded evaporator is connected with a compressor through a pipeline, a suction inlet of the compressor is connected with one end of a spray cooling pipeline, a low-temperature refrigerant is sprayed into the suction inlet of the compressor through a temperature switch, and is mixed with bypass hot gas to enter the compressor, so that the compressor can work in an adaptive working condition range when the minimum cold and heat output is matched, thereby realizing the stepless regulation of the cold and heat, the other end of the spray cooling pipeline is connected with a bidirectional liquid storage tank, a four-way reversing valve is arranged on a connecting pipeline of the compressor, the compressor is respectively connected with an air-cooled fin type condenser and a gas-liquid separator through the four-way reversing valve, the connecting pipeline of the gas-liquid separator is connected with the compressor through a, through improvement, the energy regulation is realized by adopting a hot gas bypass and refrigerant flow control method in cooperation with the use of an electronic expansion valve.
And when the hot gas bypass valve is opened, the suction pressure of the compressor is increased along with the electronic expansion valve, and the electronic expansion valve is matched to gradually reduce the opening degree.
The gas-liquid separator is communicated with the spray liquid cooling pipeline, and the spray liquid cooling pipeline and the hot gas bypass pipeline are both provided with electromagnetic valves.
Referring to fig. 2, a method of adjustment of a coordinated electronic expansion valve is shown, as shown in the figure, TEV: an expansion valve, the opening degree of which can affect the flow rate of the refrigerant entering the evaporator and change the evaporation pressure in the evaporator;
p1: the measured pressure inside the pipe at the outlet of the evaporator is the low pressure generated by the compressor suction, and this pressure can be regarded as the pressure inside the evaporator, ignoring the slight pressure difference inside the pipe. This pressure determines the evaporation temperature of the refrigerant, the lower the pressure, the lower the evaporation temperature;
tv: the saturation (evaporation) temperature, specifically the temperature at the liquid-gas interface in the evaporator, will be slightly higher above the gas temperature. In practice, this temperature is calculated from the suction pressure P1;
t0: the air temperature is the object of the evaporator for providing refrigeration, and the temperature difference dT between the air temperature and the saturation temperature Tv is the power for heat exchange between the inside and the outside of the evaporator;
t1: the measured surface temperature of the pipe at the evaporator outlet, neglecting a small amount of temperature difference of the pipe wall, can be regarded as the gas temperature at the evaporator outlet. The temperature difference oT between this temperature and the saturation temperature Tv is called the degree of superheat.
The regulating system can be operated according to the following regulating method, so that the stepless regulation of cold and heat quantity is realized;
when the demands of cold load in summer and heat load in winter are smaller, the hot gas bypass electromagnetic valve is opened, and a part of exhaust gas of the compressor is directly bypassed to the front of the gas-liquid separator, so that the reduction of the effective flux of the refrigerant in the evaporator is realized, and the refrigerating capacity and the heating capacity of the unit are reduced;
(1) when the hot gas bypass valve is opened, the suction pressure of the compressor is increased, the electronic expansion valve is matched to gradually reduce the opening, and the heat in the compressor needs to be taken away by working medium circulation;
(2) if the valve opening is very small, the total working medium flow is possibly insufficient, so that the temperature inside the compressor is raised to generate self-protection action, a liquid spraying cooling branch is additionally arranged on the thermal process, a low-temperature refrigerant is sprayed into a suction inlet of the compressor through a temperature switch and is mixed with bypass hot gas to enter the compressor, the compressor can work in an adaptive working condition range when the minimum cold and heat output is matched, and the stepless regulation of the cold and heat is realized.
Under the adjusting method, the opening control of the electronic expansion valve is optimized from the traditional single control of the superheat degree to the control of the temperature difference.
One is as follows: there is a better correspondence between the expansion valve opening and the suction pressure. If the air temperature is stable, the constant temperature difference means a stable evaporation temperature and a stable suction pressure. There is no linear correspondence between the degree of superheat and the opening degree of the expansion valve.
The second step is as follows: once the temperature difference is stable (namely the evaporation temperature is stable), the working medium loop reaches balance after a period of time, and the superheat degree is stable. In contrast, after the opening degree of the expansion valve is adjusted, the time delay required by temperature difference stabilization is much smaller, and PID control is more favorably implemented.
And thirdly: once the temperature difference is stable (i.e. the suction pressure is stable), the load of the compressor is basically stable, and the heat exchange amount is also stable due to the stable opening degree of the valve, so that the efficiency of the system does not change greatly due to the fluctuation of the superheat degree. The reason is that the superheat degree comes from the temperature rise of the gaseous working medium, and the heat exchange of the part only accounts for a very small proportion in the whole evaporation link and can be ignored.
The standard parts used in the invention can be purchased from the market, the special-shaped parts can be customized according to the description of the specification and the accompanying drawings, the specific connection mode of each part adopts conventional means such as bolts, rivets, welding and the like mature in the prior art, the machines, the parts and equipment adopt conventional models in the prior art, and the circuit connection adopts the conventional connection mode in the prior art, so that the detailed description is omitted.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (3)
1. The utility model provides a be applicable to single air source heat pump set cold and hot governing system which characterized in that: the full-liquid type evaporator is connected with a compressor through a pipeline, a suction inlet of the compressor is connected with one end of a spray cooling pipeline, the other end of the spray cooling pipeline is connected with a bidirectional liquid storage tank, a four-way reversing valve is arranged on a connecting pipeline of the compressor, the compressor is respectively connected with an air-cooled fin type condenser and a gas-liquid separator through the four-way reversing valve, and the connecting pipeline of the gas-liquid separator is connected with the compressor through a hot gas bypass pipeline.
2. The system of claim 1, wherein the heat and cold regulation system comprises: and an electronic expansion valve is arranged on a circulating pipeline of the bidirectional liquid storage tank, the air-cooled finned condenser is connected with the flooded evaporator through a pipeline, and the electronic expansion valve is arranged on the pipeline.
3. The system of claim 1, wherein the system is adapted for a single air source heat pump unit: the gas-liquid separator is communicated with the spray liquid cooling pipeline, and the spray liquid cooling pipeline and the hot gas bypass pipeline are both provided with electromagnetic valves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010336774.7A CN111473542A (en) | 2020-04-26 | 2020-04-26 | Cold and heat adjusting system and method suitable for single air source heat pump unit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010336774.7A CN111473542A (en) | 2020-04-26 | 2020-04-26 | Cold and heat adjusting system and method suitable for single air source heat pump unit |
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| CN111473542A true CN111473542A (en) | 2020-07-31 |
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| CN202010336774.7A Pending CN111473542A (en) | 2020-04-26 | 2020-04-26 | Cold and heat adjusting system and method suitable for single air source heat pump unit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113137789A (en) * | 2021-04-15 | 2021-07-20 | 青岛海尔空调电子有限公司 | Control method of refrigeration system and refrigeration system |
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|---|---|---|---|---|
| CN202734366U (en) * | 2012-07-05 | 2013-02-13 | 泰豪科技股份有限公司 | Air conditioning unit running at low load |
| CN103206798A (en) * | 2013-04-01 | 2013-07-17 | 合肥通用机械研究院 | Self-adaptation variable volume refrigeration system |
| CN104848587A (en) * | 2014-02-18 | 2015-08-19 | 青岛海信日立空调系统有限公司 | Frequency conversion multi-connected type heat pump system and control method of bypass electronic expansion valve |
| WO2018120783A1 (en) * | 2016-12-27 | 2018-07-05 | 江苏天舒电器股份有限公司 | Control method and control device for dual variable-capacity heat pump combined cooling and heating system |
| CN213396005U (en) * | 2020-04-26 | 2021-06-08 | 徐州极子能源管理有限公司 | Cold and hot governing system suitable for single air source heat pump set |
-
2020
- 2020-04-26 CN CN202010336774.7A patent/CN111473542A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202734366U (en) * | 2012-07-05 | 2013-02-13 | 泰豪科技股份有限公司 | Air conditioning unit running at low load |
| CN103206798A (en) * | 2013-04-01 | 2013-07-17 | 合肥通用机械研究院 | Self-adaptation variable volume refrigeration system |
| CN104848587A (en) * | 2014-02-18 | 2015-08-19 | 青岛海信日立空调系统有限公司 | Frequency conversion multi-connected type heat pump system and control method of bypass electronic expansion valve |
| WO2018120783A1 (en) * | 2016-12-27 | 2018-07-05 | 江苏天舒电器股份有限公司 | Control method and control device for dual variable-capacity heat pump combined cooling and heating system |
| CN213396005U (en) * | 2020-04-26 | 2021-06-08 | 徐州极子能源管理有限公司 | Cold and hot governing system suitable for single air source heat pump set |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113137789A (en) * | 2021-04-15 | 2021-07-20 | 青岛海尔空调电子有限公司 | Control method of refrigeration system and refrigeration system |
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