CN108562077B - Stable enthalpy increasing method - Google Patents
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- CN108562077B CN108562077B CN201810388095.7A CN201810388095A CN108562077B CN 108562077 B CN108562077 B CN 108562077B CN 201810388095 A CN201810388095 A CN 201810388095A CN 108562077 B CN108562077 B CN 108562077B
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- 238000000034 method Methods 0.000 title claims abstract description 39
- 230000008569 process Effects 0.000 claims abstract description 8
- 238000010977 unit operation Methods 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 230000007423 decrease Effects 0.000 claims description 10
- 230000003247 decreasing effect Effects 0.000 claims description 4
- 238000002347 injection Methods 0.000 description 43
- 239000007924 injection Substances 0.000 description 43
- 238000005057 refrigeration Methods 0.000 description 16
- 238000004378 air conditioning Methods 0.000 description 15
- 230000009467 reduction Effects 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 7
- 239000003507 refrigerant Substances 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 230000002035 prolonged effect Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000004781 supercooling Methods 0.000 description 1
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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
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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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- 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
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
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- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention provides a stable enthalpy increasing method, which ensures that the enthalpy increase of a refrigerating system is stably carried out through the opening control of a valve body and avoids the frequent opening or closing of the enthalpy increase. The method comprises the following steps: acquiring exhaust temperature and effluent temperature in the unit operation process, and acquiring exhaust superheat degree according to the exhaust temperature and the effluent temperature; judging whether the exhaust superheat degree is larger than a set exhaust superheat degree value or not; when the exhaust superheat degree is larger than the exhaust superheat degree set value, acquiring the current environment temperature, and adjusting the opening of the main valve and the opening of the auxiliary valve to the set opening of the valve body according to the current environment temperature; step four, after the unit operates for a certain time according to the set opening of the valve body, detecting the current exhaust temperature; judging whether the current exhaust temperature is greater than or equal to the exhaust temperature; and step six, when the current exhaust temperature is greater than or equal to the exhaust temperature, gradually reducing the opening of the main valve or increasing the opening of the auxiliary valve until the current exhaust temperature is less than the exhaust temperature or the opening of the main valve and the opening of the auxiliary valve reach limit values.
Description
Technical Field
The invention relates to the technical field of air-conditioning heat pumps, in particular to a stable enthalpy increasing method.
Background
In order to reduce the exhaust temperature of a product and improve the running stability of the product under a severe working condition, an outlet refrigerant of a condenser is generally divided into two parts, a main flow path refrigerant flows to an evaporator to absorb heat and evaporate, an auxiliary flow path refrigerant flows to a compressor to spray liquid or increase vapor injection, and the exhaust temperature of the compressor is reduced.
The existing enhanced vapor injection technology controls the opening or closing of an auxiliary electronic expansion valve through the superheat degree of a refrigerant at an inlet and an outlet of an enhanced vapor valve, when the superheat degree is larger than a maximum set value, the electronic expansion valve is closed to be small, when the superheat degree is smaller than a minimum set value, the electronic expansion valve is opened to be large, when the superheat degree is between a set minimum value and a set maximum value, the opening degree of the electronic expansion valve is kept unchanged, and the auxiliary electronic expansion valve is closed until the exhaust gas of a compressor is reduced to a set value.
The existing enhanced vapor injection technology also controls the opening or closing of an auxiliary electronic expansion valve through exhaust temperature and outlet water temperature, when the exhaust superheat degree is larger than the maximum set value of the system, an enhanced vapor injection valve opens the enhanced vapor injection valve, when the exhaust superheat degree is smaller than the minimum set value of the system, the enhanced vapor injection valve closes, and when the exhaust superheat degree is between the set minimum value and the set maximum value, the enhanced vapor injection valve keeps the current opening degree to continuously operate.
The enthalpy-increasing ports of the existing enhanced vapor injection compressor are all arranged in a medium-pressure cavity of the compressor, the pressure of the medium-pressure cavity is not a constant value, the pressure value fluctuates periodically, the size of the pressure value is related to the evaporation temperature and the condensation temperature, and the refrigeration system can continue enhanced vapor injection only when the pressure of the auxiliary electronic expansion inlet is larger than the maximum pressure value of the enthalpy-increasing ports of the compressor.
It can be seen from the above that, in the prior art, neither the normal enhanced vapor injection of the refrigeration system can be ensured, nor the continuous and stable enhanced vapor injection of the valve body can be controlled, which causes the frequent opening or closing of the enhanced vapor injection of the refrigeration system and affects the heating capacity, the energy efficiency ratio, the service life and the comfort of the air-conditioning heat pump product.
Disclosure of Invention
The invention provides a stable enthalpy increasing method, which ensures that the enthalpy increase of a refrigerating system is stably carried out by controlling the opening of the valve body, avoids the frequent opening or closing of the enthalpy increase, improves the heating capacity and the energy efficiency ratio of an air-conditioning heat pump product and prolongs the service life of the air-conditioning heat pump product.
The technical scheme of the stable enthalpy increasing method comprises the following steps:
acquiring exhaust temperature and effluent temperature in the unit operation process, and acquiring exhaust superheat degree according to the exhaust temperature and the effluent temperature;
judging whether the exhaust superheat degree is larger than an exhaust superheat degree set value or not;
when the exhaust superheat degree is larger than the exhaust superheat degree set value, acquiring the current environment temperature, and adjusting the opening of the main valve and the opening of the auxiliary valve to the set opening of the valve body according to the current environment temperature;
step four, after the unit operates for a certain time according to the set opening of the valve body, detecting the current exhaust temperature;
judging whether the current exhaust temperature is greater than or equal to the exhaust temperature;
and step six, when the current exhaust temperature is greater than or equal to the exhaust temperature, gradually reducing the opening degree of the main valve or increasing the opening degree of the auxiliary valve until the current exhaust temperature is less than the exhaust temperature, or the opening degree of the main valve and the opening degree of the auxiliary valve reach limit values.
Preferably, in the technical scheme of the smooth enthalpy-increasing method,
and step seven, when the current exhaust temperature is lower than the exhaust temperature, calculating the temperature drop rate.
Preferably, in the technical scheme of the smooth enthalpy-increasing method,
in the seventh step, the temperature drop rate is a ratio of a difference value between the current exhaust temperature and the exhaust temperature to an operation time.
Preferably, in the technical scheme of the smooth enthalpy-increasing method,
and step eight, judging whether the temperature drop rate is less than or equal to a system temperature drop set value, if so, operating the unit according to the current opening of the valve body.
Preferably, in the technical scheme of the smooth enthalpy-increasing method,
and step eight, if the temperature drop rate is greater than the set system temperature drop value, gradually reducing the opening of the auxiliary valve until the temperature drop rate meets the set system temperature drop value or the opening of the auxiliary valve reaches a limit value.
Preferably, in the technical scheme of the smooth enthalpy-increasing method,
the first step specifically comprises: and acquiring the exhaust temperature and the effluent temperature in the running process of the unit, and calculating to obtain the temperature difference between the exhaust temperature and the effluent temperature, wherein the temperature difference is the exhaust superheat degree.
Preferably, in the technical scheme of the smooth enthalpy-increasing method,
in the first step, the exhaust temperature and the effluent temperature in the running process of the unit are obtained through an exhaust temperature sensor and an effluent temperature sensor.
Preferably, in the technical scheme of the smooth enthalpy-increasing method,
in the sixth step, the main valve opening degree is decreased progressively according to an arithmetic function, and the auxiliary valve opening degree is increased progressively according to an arithmetic function.
The invention discloses a stable enthalpy-increasing method in an air-conditioning heat pump system, which is characterized in that the opening or closing of enthalpy increase is controlled according to the exhaust superheat degree, namely the difference value of the exhaust temperature minus the outlet water temperature is controlled, and when the difference value is larger than the set maximum value of the exhaust superheat degree, the enthalpy increase is opened; when the difference is smaller than the set minimum value of the exhaust superheat degree, enthalpy increase is closed. When the unit meets the enthalpy-increasing entry condition, working condition parameters such as the current environment temperature are detected, and when the refrigeration system enters the enhanced vapor injection, the opening degree of the valve body is adjusted to the set opening degree of the valve body. After the system enters the enhanced vapor injection system, the control system controls the opening of the main valve and the opening of the auxiliary valve by detecting the variation trend of the exhaust temperature, and through the control of the opening of the valve body, the stable enhancement of the enthalpy of the refrigeration system is ensured, the frequent opening or closing of the enhancement of the enthalpy is avoided, the heating capacity and the energy efficiency ratio of an air-conditioning heat pump product are improved, and the service life of the air-conditioning heat pump product is prolonged.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a flow chart of a smooth enthalpy-increasing method according to the present invention.
Detailed Description
The invention provides a stable enthalpy increasing method, which ensures that the enthalpy increase of a refrigerating system is stably carried out by controlling the opening of the valve body, avoids the frequent opening or closing of the enthalpy increase, improves the heating capacity and the energy efficiency ratio of an air-conditioning heat pump product and prolongs the service life of the air-conditioning heat pump product.
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.
The technical scheme of the stable enthalpy increasing method comprises the following steps:
step one 101, acquiring an exhaust temperature Tq0 and an effluent temperature Twc0 in the running process of the unit, and acquiring the exhaust superheat degree according to the exhaust temperature Tq0 and the effluent temperature Twc 0.
After the air-conditioning heat pump unit is started to operate, the control system detects the exhaust temperature Tq0 of the compressor and the water outlet temperature Twc0 of the heat supply end in the operation process in real time through the exhaust temperature sensor and the water outlet temperature sensor.
The exhaust superheat degree of the compressor is obtained according to the exhaust temperature Tq0 and the outlet water temperature Twc0, specifically, the temperature difference between the exhaust temperature Tq0 and the outlet water temperature Twc0 is obtained, and the temperature difference is the exhaust superheat degree, namely, the exhaust superheat degree is Tq0-Twc 0.
In order to effectively control the exhaust temperature to operate in a set range, the stable enthalpy increasing method controls the opening or closing of the enhanced vapor injection by detecting the difference between the exhaust temperature and the outlet water temperature, namely, the stable enthalpy increasing method controls the opening or closing according to the exhaust superheat degree, namely the difference between the exhaust temperature and the outlet water temperature.
And step two 102, judging whether the exhaust superheat degree is larger than an exhaust superheat degree set value.
After the exhaust superheat degree is calculated by subtracting the outlet water temperature Twc0 from the exhaust temperature Tq0 detected in the first step 101, the exhaust superheat degree is compared with an exhaust superheat degree set value Ps0 preset by a system. The set value Ps0 of the exhaust superheat degree may be a range value, and when the difference is larger than the set maximum value of the exhaust superheat degree, the enthalpy increase is opened; when the difference is smaller than the set minimum value of the exhaust superheat degree, enthalpy increase is closed.
And step three 103, when the exhaust superheat degree is larger than the exhaust superheat degree set value, acquiring the current environment temperature, and adjusting the opening of the main valve and the opening of the auxiliary valve to the set opening of the valve body according to the current environment temperature.
According to the description in the second step 102, when (Tq0-Twc0) > Ps0max, that is, when the exhaust superheat degree is greater than the maximum superheat degree set value Ps0max, and the unit meets the enthalpy-increasing entry condition, the control system detects the current ambient temperature Trt, and different ambient temperatures have preset valve body set opening degrees, that is, the main valve opening degree and the auxiliary valve opening degree are divided into a plurality of area values according to the operating condition parameters. It is understood that the main valve opening is adjusted to Pzr and the auxiliary valve opening is adjusted to Pfr according to the valve body setting opening Pzr and Pfr, i.e., the system default, corresponding to the current ambient temperature Trt.
And step four 104, after the unit operates for a certain time t according to the set opening of the valve body, detecting the current exhaust temperature Tqt.
In order to quickly adjust the opening degree of the valve body to a reasonable enthalpy-increasing opening degree value, the enthalpy-increasing method divides the opening degree of the main valve and the opening degree of the auxiliary valve into a plurality of area values through working condition parameters such as environment temperature, and the like, in order to detect whether the opening degree of the valve body can be selected according to the current environment temperature to increase the enthalpy of injection and reduce the exhaust temperature, the enthalpy-increasing method continues to operate for a certain time after the enthalpy of injection is introduced, and then the change condition of the current exhaust temperature is detected to control the opening degree of the valve body.
After the control system adjusts the set opening of the valve body according to the ambient temperature Trt, the refrigeration system operates for a certain time t according to the set opening Pzr and Pfr of the valve body, and then the control system detects the current exhaust temperature Tqt. The unit operation time t is more than or equal to Ts, and the Ts is the preset operation time of the system.
And step five 105, judging whether the current exhaust temperature Tqt is greater than or equal to the exhaust temperature Tq 0.
According to the comparison of the current exhaust temperature Tqt detected in the step four 104 and the exhaust temperature Tq0, the exhaust temperature Tq0 is the exhaust temperature before enthalpy increase.
If Tqt is less than Tq0, it indicates that the refrigeration system is performing enhanced vapor injection normally and the exhaust temperature begins to decrease.
If Tqt is larger than or equal to Tq0, it indicates that the refrigeration system cannot increase vapor injection, and the exhaust temperature cannot be reduced, at this time, the refrigeration system needs to adjust the inlet pressure of the auxiliary electronic expansion valve and the vapor injection opening pressure of the compressor by adjusting the opening of the main valve (the opening of the main electronic expansion valve) and the opening of the auxiliary valve (the opening of the auxiliary electronic expansion valve), and the inlet pressure of the auxiliary electronic expansion valve is larger than the vapor injection opening pressure of the compressor by establishing a pressure difference, so that the vapor injection can be normally increased.
And step six 106, when the current exhaust temperature Tqt is greater than or equal to the exhaust temperature Tq0, gradually reducing the opening of the main valve or increasing the opening of the auxiliary valve until the current exhaust temperature Tqt is less than the exhaust temperature Tq0 or the opening of the main valve and the opening of the auxiliary valve reach limit values.
In order to ensure that the inlet pressure of the auxiliary electronic expansion valve is larger than the value of the enthalpy increasing opening of the compressor, after the system enters the enhanced vapor injection, the control system controls the opening degrees of the main electronic expansion valve and the auxiliary electronic expansion valve by detecting the variation trend of the exhaust temperature, increases the inlet pressure of the auxiliary electronic expansion valve by reducing the opening degree of the main valve or increasing the opening degree of the auxiliary valve, and reduces the inlet pressure of the auxiliary electronic expansion valve by increasing the opening degree of the main valve or reducing the opening degree of the auxiliary valve.
When Tqt is larger than or equal to Tq0, the air-conditioning heat pump system realizes enhanced vapor injection by establishing a pressure difference, namely the air-conditioning heat pump system increases the inlet pressure of the auxiliary electronic expansion valve by gradually reducing the opening of the main valve or increasing the opening of the auxiliary valve until Tqt is smaller than Tq0, thereby realizing the enhanced vapor injection and reducing the exhaust temperature.
The pressure differential is established in the following manner:
when Tqt is equal to or greater than Tq0, the control system first gradually decreases the main valve opening (main electronic expansion valve opening) from Pzr in △ Pz valve steps until Tqt is less than Tq0 or until the adjusted main valve opening is not less than the minimum value Pzmin of the main valve opening area value corresponding to the current ambient temperature Trt, it is understood that the main valve opening is adjusted to Pzr-n △ Pz (n is the number of times of adjustment and △ Pz is the preset number of main valve adjustment steps) according to Pzt, and the control makes the main valve opening smaller and smaller, but the adjusted main valve opening is not less than the minimum value Pzmin of the main valve opening area value corresponding to the current ambient temperature Trt.
After the opening of the main valve is reduced by △ Pz, the control system operates for a certain time t, then the current exhaust temperature Tqt is detected, and the relationship between Tqt and Tq0 is judged.
If Tqt is less than Tq0, it indicates that the refrigeration system can increase the vapor injection, the exhaust temperature begins to decrease, the main valve opening is performed according to Pzt, and the auxiliary valve opening is performed according to Pfr, if Tqt is more than or equal to Tq0, it indicates that the refrigeration system can not increase the vapor injection normally, the main valve opening needs to be reduced continuously, and the main valve opening continues to be reduced according to △ Pz valve steps until the exhaust temperature decreases or the main valve opening is equal to the minimum opening Pzmin of the main electronic expansion opening area corresponding to the current environment temperature Trt.
When the main valve opening Pzt is equal to Pzmin, Tqt is equal to or greater than Tq0, which indicates that the exhaust temperature is not decreasing, the auxiliary valve opening needs to be adjusted by increasing the auxiliary valve opening, and the control system gradually increases the auxiliary valve opening from Pfr to Tqt < Tq0 in △ Pf valve steps, or the adjusted auxiliary valve opening is not greater than the maximum value Pfmax of the auxiliary valve opening area value corresponding to the current ambient temperature Trt.
Similarly, after the opening of the auxiliary valve is increased by △ Pf, the control system operates for a certain time t, then the current exhaust temperature Tqt at the moment is detected, and the relationship between Tqt and Tq0 is judged.
If Tqt is less than Tq0, the refrigeration system can increase the injection enthalpy, the exhaust temperature starts to decrease, and the opening of the auxiliary valve is performed according to Pft. if Tqt is more than or equal to Tq0, the refrigeration system cannot increase the injection enthalpy normally, the opening of the auxiliary valve needs to be increased continuously, and the opening of the auxiliary valve is increased continuously according to △ Pf valve steps until the exhaust temperature decreases or the opening of the main valve is equal to the maximum opening value Pfmax of the auxiliary electronic expansion opening area corresponding to the current ambient temperature Trt.
The inlet pressure of the auxiliary electronic expansion valve is increased by reducing the opening degree of the main valve or increasing the opening degree of the auxiliary valve, so that the functions of increasing the vapor injection enthalpy and reducing the exhaust temperature are realized. Of course, when the valve opening system adjusted according to the ambient temperature Trt cannot normally increase the vapor injection enthalpy, the control system may increase the auxiliary valve opening Pft until the exhaust gas decreases or the auxiliary valve opening becomes equal to the maximum value Pfmax of the auxiliary valve opening region values corresponding to the current ambient temperature Trt, and then adjust the main valve opening by decreasing the main valve opening until the exhaust gas temperature decreases or the main valve opening becomes equal to the minimum value of the main valve opening region values corresponding to the current ambient temperature Trt.
In the technical scheme, after the valve body opening selected through the ambient temperature or the valve body opening is adjusted to meet the enhanced vapor injection and reduce the exhaust temperature, the exhaust temperature is likely to have the undesirable phenomena of rapid decrease or rapid increase and the like. The enhanced vapor injection control has the phenomenon of frequent opening or closing. In order to reduce the air injection amount and ensure the stable operation of the exhaust temperature in a reasonable area, the enthalpy increase is continuously carried out by a continuous enthalpy increase technology, namely, the continuous and stable operation of the air-conditioning heat pump system is maintained by adjusting the air injection amount of the enhanced vapor injection.
After determining whether the current exhaust temperature Tqt is equal to or greater than the exhaust temperature Tq0 in step five 105, step seven 107 may be further performed to calculate a temperature drop rate when the current exhaust temperature Tqt is less than the exhaust temperature Tq 0.
And when the current exhaust temperature Tqt is less than the exhaust temperature Tq0 after the unit operates for a certain time t, namely Tqt is less than Tq0, the control system then calculates the temperature reduction rate, wherein the temperature reduction rate is (Tqt-Tq 0)/t.
And step eight 108, judging whether the temperature reduction rate in the step seven 107 is less than or equal to a system temperature reduction set value k.
In step eight 108, the temperature drop rate (Tqt-Tq0)/t is compared with the system temperature drop set value k.
When (Tqt-Tq0)/t is less than or equal to k, the temperature drop rate of the system is in a reasonable range, the air injection is proper, the temperature drop is mild and continuous, and the control system controls the opening of the main valve and the opening of the auxiliary valve to continue the air injection enthalpy increasing operation according to the current valve body opening Pzt and Pft. Through the establishment of the enthalpy-increasing port pressure difference and the implementation of continuous enthalpy increase, when the exhaust superheat degree (Tq0-Twc0) > Ps0min, the control system keeps the current valve body opening to continue running, and when the exhaust superheat degree (Tq0-Twc0) < Ps0min, the control system closes the air injection enthalpy increase, so that the air-conditioning heat pump system realizes the continuous and stable enthalpy increase function.
When the Tqt-Tq0)/t is larger than k, the system temperature drops quickly and is larger than the set value of the system temperature drop, the exhaust temperature drops quickly, when the exhaust temperature is lower than a certain value, the control system quits the jet enthalpy increasing control, the exhaust temperature of the system rises quickly, and after the exhaust temperature reaches a certain temperature, the jet enthalpy increasing is opened to reduce the exhaust temperature. The control system repeatedly opens or closes the enhanced vapor injection, and the heating capacity of the system fluctuates periodically, so that the heating capacity and the service life of the product are influenced.
Therefore, when (Tqt-Tq0)/t > k, the control system then adjusts the auxiliary valve opening by a preset auxiliary electronic expansion valve adjustment step number △ Pf, that is, Pft is Pfr-X △ Pf (X is the number of times the valve is adjusted), every time the auxiliary valve opening is adjusted by △ Pf, the refrigeration system operates for a certain time t according to the current valve body opening, then detects whether the exhaust gas temperature drop rate is within the reasonable range.
The enthalpy increasing method controls the adjustment of the opening of the auxiliary electronic expansion valve by detecting the exhaust temperature reduction rate through the control system, and when the exhaust temperature reduction rate is less than or equal to a system set value, the main electronic expansion valve and the auxiliary electronic expansion valve keep the current opening; when the exhaust temperature reduction rate is larger than the set value of the system, the opening of the auxiliary electronic expansion valve is gradually reduced until the exhaust temperature reduction rate is within the set range.
The stable enthalpy increasing method has the following advantages:
(1) the wide-range enthalpy-increasing function is realized, and the refrigeration system can carry out the enhanced vapor injection under severe working conditions through the design of the enthalpy-increasing technology. (2) The function of low exhaust temperature is realized, and the exhaust temperature is not higher than 85 ℃ at the water outlet temperature of 60 ℃ by controlling the exhaust superheat degree. (3) The high-energy-efficiency function is realized, and the supercooling degree of the refrigerant of the main flow path is improved through enhanced vapor injection, so that the heating capacity and the energy efficiency ratio of the air-conditioning heat pump unit are improved. (4) The service life of the product is prolonged, the air injection enthalpy increasing is used for reducing exhaust, and the service life of the compressor and even the service life of the parts of the whole refrigeration system can be prolonged. (5) Improving enthalpy-increasing stability: the exhaust temperature drop rate is controlled by controlling the enthalpy increasing amount of the refrigerating system, and the continuous and stable enthalpy increasing function is realized.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present 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 solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. A smooth enthalpy addition method, comprising:
acquiring an exhaust temperature and an effluent temperature in the running process of a unit, and acquiring an exhaust superheat degree according to the exhaust temperature and the effluent temperature, wherein the exhaust superheat degree is a temperature difference value between the exhaust temperature and the effluent temperature;
judging whether the exhaust superheat degree is larger than an exhaust superheat degree set value or not;
when the exhaust superheat degree is larger than the exhaust superheat degree set value, acquiring the current environment temperature, and adjusting the opening of the main valve and the opening of the auxiliary valve to the set opening of the valve body according to the current environment temperature;
step four, after the unit operates for a certain time according to the set opening of the valve body, detecting the current exhaust temperature;
judging whether the current exhaust temperature is greater than or equal to the exhaust temperature;
and step six, when the current exhaust temperature is greater than or equal to the exhaust temperature, gradually reducing the opening degree of the main valve or increasing the opening degree of the auxiliary valve until the current exhaust temperature is less than the exhaust temperature, or the opening degree of the main valve and the opening degree of the auxiliary valve reach limit values.
2. The smooth enthalpy adding method according to claim 1, further comprising a step seven of calculating a temperature drop rate when the current exhaust temperature is less than the exhaust temperature.
3. The smooth enthalpy adding method according to claim 2, wherein in the seventh step, the temperature drop rate is a ratio of a difference between the current exhaust temperature and the exhaust temperature to a running time.
4. The stable enthalpy increasing method according to claim 2, further comprising step eight of judging whether the temperature drop rate is less than or equal to a system temperature drop set value, if so, the unit operates according to the current valve body opening.
5. The smooth enthalpy increasing method according to claim 4, wherein the step eight further includes, if the temperature drop rate is greater than the system temperature drop set value, gradually decreasing the auxiliary valve opening until the temperature drop rate meets the system temperature drop set value or the auxiliary valve opening reaches a limit value.
6. The enthalpy smoothly increasing method according to claim 1, wherein in the first step, the exhaust temperature and the outlet water temperature in the unit operation process are obtained through an exhaust temperature sensor and an outlet water temperature sensor.
7. The smooth enthalpy adding method according to any one of claims 1 to 5, wherein in step six, the main valve opening degree decreases according to an arithmetic function, and the auxiliary valve opening degree increases according to an arithmetic function.
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| CN109237748B (en) * | 2018-09-28 | 2021-03-19 | 宁波奥克斯电气股份有限公司 | Liquid spraying control method and device and air conditioner |
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