CN108266863A - The control method that a kind of defrost exhaust-heat absorption recycles - Google Patents
The control method that a kind of defrost exhaust-heat absorption recycles Download PDFInfo
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- CN108266863A CN108266863A CN201711480671.2A CN201711480671A CN108266863A CN 108266863 A CN108266863 A CN 108266863A CN 201711480671 A CN201711480671 A CN 201711480671A CN 108266863 A CN108266863 A CN 108266863A
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- Prior art keywords
- defrost
- temperature
- air
- heat
- conditioning system
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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
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
- F25B47/022—Defrosting cycles hot gas defrosting
- F25B47/025—Defrosting cycles hot gas defrosting by reversing the cycle
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses the control methods that a kind of defrost exhaust-heat absorption recycles, after air-conditioning system defrost, control system controls air-conditioning system to carry out recuperation of heat processing to defrost waste heat by detecting coil temperature Tb and environment temperature Tr, compared with the prior art, the control method is after air conditioner heat pump system defrost, refrigeration system first absorbs heat source side heat exchanger heat and restarts wind turbine, and heat source side heat exchanger defrost waste heat is avoided to absorb waste by the air of low temperature；The control method not only reduces thermal loss of the air conditioner heat pump system during heat source side heat exchanger defrost, the start and stop of wind turbine are controlled by coil temperature, environment temperature and thresholding temperature △ t simultaneously, system heating operation at higher ambient temperatures is ensured, so as to reduce defrost energy loss and improve Energy Efficiency Ratio.
Description
Technical field
The present invention relates to the technical fields of air conditioner heat pump system, refer in particular to the control that a kind of defrost exhaust-heat absorption recycles
Method.
Background technology
The easy frosting of heat source side heat exchanger at low ambient temperatures of existing air conditioner heat pump system, influence set heat exchange effect and
Heating capacity.To ensure unit normal operation, the prior art changes heat source side by detecting heat source side heat exchanger coil temperature
Hot device carries out defrost, when heat source side heat exchanger frosting to a certain extent when, coil temperature is lower and lower, when coil temperature drops to
During setting value, refrigeration system closes wind turbine, and reversal valve commutation carries out defrost to heat source side heat exchanger；It is set when coil temperature rises to
During definite value, refrigeration system opens wind turbine, and reversal valve commutation is heated.
For existing defrost technology at the end of heat source side heat exchanger defrost, heat source side heat exchanger absorbs portion during defrost
Divide heat that the temperature of itself is made to increase defrost, the temperature of heat source side heat exchanger is higher than the temperature of environment, if system starts wind at this time
Heat of the machine on progress heating operation, heat exchanger is taken away by the air absorption of low temperature, causes amount of heat loss, reduces
The Energy Efficiency Ratio of air conditioner and heat pump unit.
Invention content
It is an object of the invention to overcome the deficiencies of the prior art and provide the controlling parties that a kind of defrost exhaust-heat absorption recycles
Method；
In order to realize above-mentioned purpose, the control method that a kind of defrost exhaust-heat absorption provided by the present invention recycles, in air-conditioning
After system defrost, control system controls air-conditioning system to carry out defrost waste heat by detecting coil temperature Tb and environment temperature Tr
Recuperation of heat is handled.
Further, include the following steps：
S10. air-conditioning system is in heating operation state；
S20. control system detects that environment temperature Tr, coil temperature Tb meet the requirement of defrost condition, and air-conditioning system enters defrost
Pattern and air-conditioning system start to carry out defrost to the heat exchanger of heat source side, until completing defrost；
When S30. switching to heating operation mode after air-conditioning system completion defrost, control system is by comparing coil temperature Tb with presetting
Relationship is to control being turned on and off for wind turbine between fixed temperature value Tbs；
S40. after air-conditioning system enters heating operation, control system then detects coil temperature Tb and environment temperature Tr and thresholding temperature
Relationship between degree △ t is to control wind turbine to be turned on and off；
S50. when coil temperature Tb is less than or equal to the sum of environment temperature Tr and thresholding temperature △ t value, wind turbine opens operation.
Further, in step S20, defrost is carried out, while during defrost after air-conditioning system meets defrost condition
Wind turbine is closed；In step s 30, when coil temperature Tb is less than presetting temperature value Tbs, wind turbine starts, and air-conditioning system passes through
Heat source side heat exchanger absorbs atmospheric heat and carries out heating operation；In step s 40, when coil temperature Tb be more than environment temperature Tr and
During the sum of thresholding temperature △ t values, wind turbine remains turned-off, and air-conditioning system absorbs the heat that heat source side heat exchanger is retained and heated
Operation；In step s 40, thresholding temperature △ t adapt to air-conditioning according to the specification size of air-conditioning system to carry out adjusting accordingly
System keeps Effec-tive Function under the conditions of normal heating.
The present invention uses above-mentioned scheme, and advantage is：1）Reduce defrost thermal loss：Compared with the prior art,
After air conditioner heat pump system defrost, refrigeration system first absorbs heat source side heat exchanger heat and restarts wind turbine the control method,
Heat source side heat exchanger defrost waste heat is avoided to absorb waste by the air of low temperature；2）Improve Energy Efficiency Ratio：Compared with the prior art, the control
Method not only reduces thermal loss of the air conditioner heat pump system during heat source side heat exchanger defrost, while passes through coil pipe temperature
The start and stop of degree, environment temperature and thresholding temperature △ t control wind turbines, it is ensured that system heating operation at higher ambient temperatures, from
And it reduces defrost energy loss and improves Energy Efficiency Ratio.
Description of the drawings
Fig. 1 is the defrost exhaust-heat absorption control method logical schematic of the present invention.
Specific embodiment
With reference to specific embodiment, the present invention is further illustrated.
Referring to shown in attached drawing 1, control method that a kind of defrost exhaust-heat absorption of the present embodiment recycles, in air-conditioning system
After frost, control system controls air-conditioning system to carry out recuperation of heat to defrost waste heat by detecting coil temperature Tb and environment temperature Tr
Processing.
In the present embodiment, it now enumerates defrost exhaust-heat absorption and recycles implementation of the control method inside hot pump in low temp system
Example：Existing low-temperature air source heat pump system under low ambient temperature compared with running, the easy frosting of heat source side heat exchanger, and influences machine
Group heating capacity and Energy Efficiency Ratio, for this reason, it may be necessary to air-conditioning carries out defrost processing with defrost pattern to heat source side heat exchanger, and in defrost
Cheng Zhong, net for air-source heat pump units is absorbed carries out defrost, refrigeration system defrost process apoplexy using end heat to heat source side heat exchanger
Machine is out of service, the defrost that control system exits the relationship control refrigeration system of temperature by monitoring coil temperature and defrost.
When air-conditioning system meets defrost exit criteria, air-conditioning system stops defrost, and reversal valve carries out commutation so as to making
Heating operation is carried out with end；But it is to directly initiate wind turbine to end is used to carry out heating operation that air-conditioning system terminates in defrost, then
Heat source side heat exchanger defrosting waste heat can be caused to be taken away by Cryogenic air, cause the loss of heat, for this purpose, the control method of the application
When unit defrost pattern switchs to heating operation mode, coil temperature Tb and presetting temperature value are first detected by control system
Relationship between Tbs.
As Tb ＜ Tbs, i.e. when coil temperature Tb is less than presetting temperature value Tbs, illustrate heat source side heat exchange temperature compared with
Low and also lower than set temperature value Tbs, defrost retains that heat is less, then air-conditioning system can start wind in heating operation
Machine, and atmospheric heat is absorbed by heat source side heat exchanger and is heated.
As Tb >=Tbs, i.e., when coil temperature is more than or equal to presetting temperature value Tbs, illustrate heat source side heat exchange temperature
Higher, heat changes end heat exchanger and waste heat is also retained after defrost, and air-conditioning can first absorb the heat that heat source daunt heat exchangers are retained
Amount is heated, and wind turbine is avoided to absorb the part of waste heat and discharge the external world, causes thermal loss.Therefore, as Tb >=Tbs,
Air-conditioning system is closed lower absorption heat source side heat exchanger heat in wind turbine and carries out heating operation.
Lower absorption heat source side heat exchanger is closed in wind turbine and carries out heating operation, and heat source side heat exchange temperature is more next
It is lower, when heat source side heat exchanger coils temperature is reduced to certain value, wind turbine need to be started, air-conditioning system absorbs atmospheric heat and carries out
Heating, it is ensured that the efficient heating operation of refrigeration system.Therefore, in air-conditioning system when wind turbine closed state carries out heating operation, control
System processed starts to detect coil temperature Tb and environment temperature Tr.
As Tb ＞ Tr+ △ t, i.e. when coil temperature Tb is more than environment temperature Tr plus presetting thresholding temperature △ t, explanation
The temperature of heat source side heat exchanger is higher than environment temperature, therefore refrigeration system keeps wind turbine to close, and refrigeration system carries out heating operation.
As b≤Tr+ △ t, i.e. when coil temperature Tb is less than environment temperature Tr plus presetting thresholding temperature △ t, explanation
The temperature and environment temperature of heat source side heat exchanger are close, and refrigeration system should start wind turbine, absorb air by heat source side heat exchanger
Heat keeps the efficient heating operation of refrigeration system.
Therefore, as Tb≤Tr+ △ t, refrigeration system starts wind turbine and carries out heating operation.
During operation of air conditioner, each temperature monitoring point is respectively provided with certain hysteresis quality, that is, the practical temperature of air-conditioning system
Degree may be higher or lower than what is detected, and practical temp probe just feeds back to control system after conducting heat by copper pipe
System, therefore, air-conditioning system absorbs defrost waste heat and crosses when stressing to occur heat exchange temperature less than environment temperature in order to prevent, air-conditioning system
System starts wind turbine not yet, and control system can be tuned up by increasing value temperature △ t, △ a t according to different refrigeration systems
Or turn down, that is, when air-conditioning system is when absorbing defrost waste heat progress heating operation, the temperature of control wind turbine start and stop increases thresholding temperature
After spending △ t, coil temperature Tb is more bigger than actual environment temperature Tr when making unlatching wind turbine, it is ensured that refrigeration system inhales higher heat in time
Source heat carries out heating operation.
By above-mentioned control method, by coil temperature Tb, the coil temperature Tbs of default, environment temperature Tr and
Thresholding temperature △ t co- controlling low-temperature air source heat pump system defrosts exhaust-heat absorption recycles function.
Further, after defrost, as Tb >=Tbs, air-conditioning system first carries out heating and is then turned on wind turbine.
Further, after defrost, as Tb ＜ Tbs, air-conditioning system opens wind turbine and carries out heating operation.
Further, after air-conditioning system closes wind turbine heating operation, during Tb ＞ Tr+ △ t, unit continues to close wind turbine heating fortune
Row.
Further, after air-conditioning system closes wind turbine heating operation, during Tb≤Tr+ △ t, unit starting wind turbine carries out heating fortune
Row.
The control method that a kind of defrost exhaust-heat absorption recycles, includes the following steps：
S10. air-conditioning system is in heating operation state；
S20. control system detects that environment temperature Tr, coil temperature Tb meet the requirement of defrost condition, and air-conditioning system enters defrost
Pattern and air-conditioning system start to carry out defrost to the heat exchanger of heat source side, until completing defrost；
When S30. switching to heating operation mode after air-conditioning system completion defrost, control system is by comparing coil temperature Tb with presetting
Relationship is to control being turned on and off for wind turbine between fixed temperature value Tbs；
S40. after air-conditioning system enters heating operation, control system then detects coil temperature Tb and environment temperature Tr and thresholding temperature
Relationship between degree △ t is to control wind turbine to be turned on and off；
S50. when coil temperature Tb is less than or equal to the sum of environment temperature Tr and thresholding temperature △ t value（Tb≤Tr+△t）, wind turbine
Open operation.
Further, in step S20, defrost is carried out, while during defrost after air-conditioning system meets defrost condition
Wind turbine is closed.
Further, in step s 30, when coil temperature Tb is less than presetting temperature value Tbs（That is, Tb ＜ Tbs）, wind turbine
Start, air-conditioning system absorbs atmospheric heat by heat source side heat exchanger and carries out heating operation.
Further, in step s 40, when coil temperature Tb is more than the sum of environment temperature Tr and thresholding temperature △ t value
（That is, Tb ＞ Tr+ △ t）, wind turbine remains turned-off, and air-conditioning system absorbs the heat that heat source side heat exchanger is retained and carries out heating fortune
Row.
Further, in step s 40, thresholding temperature △ t according to the specification size of air-conditioning system to be adjusted accordingly
To adapt to air-conditioning system Effec-tive Function is kept under the conditions of normal heating.
Air-conditioning system controls the heating operation of wind turbine start and stop and air-conditioning system by coil temperature, it is ensured that unit is in defrost
The heat that journey remains in heat source side is absorbed recycling, prevents heat from being taken away by the air absorption of low temperature, causes thermal loss；
For air-conditioning system in the heating process that defrost waste heat carries out is absorbed, control system passes through coil temperature, environment temperature and domain
Value temperature △ t are controlled, it is ensured that air-conditioning system high energy efficiency under rational coil temperature absorbs defrost waste heat；Air-conditioning system exists
Defrost waste heat process is absorbed, wind turbine start and stop temperature is limited by environment temperature and thresholding temperature △ t, and be set as can by thresholding temperature △ t
Temperature adjustment angle value, it is ensured that the control method absorbs the system of defrost waste heat in the air-conditioning system high energy efficiency control system of different heating capacities
Heat operation.
The embodiment of the above is only presently preferred embodiments of the present invention, and limit in any form is not done to the present invention
System.Any those skilled in the art without departing from the scope of the technical proposal of the invention, utilize the skill of the disclosure above
Art content makes technical solution of the present invention more possible variations and retouching or modification is the equivalent embodiment of the present invention.
Therefore all contents without departing from technical solution of the present invention, the equivalent equivalence changes that thinking according to the present invention is made should all be covered by
In protection scope of the present invention.
Claims (3)
1. a kind of control method that defrost exhaust-heat absorption recycles, it is characterised in that：After air-conditioning system defrost, control system is led to
Detection coil temperature Tb and environment temperature Tr are crossed air-conditioning system to be controlled to carry out recuperation of heat processing to defrost waste heat.
2. the control method that a kind of defrost exhaust-heat absorption according to claim 1 recycles, it is characterised in that：Including following
Step：
S10. air-conditioning system is in heating operation state；
S20. control system detects that environment temperature Tr, coil temperature Tb meet the requirement of defrost condition, and air-conditioning system enters defrost
Pattern and air-conditioning system start to carry out defrost to the heat exchanger of heat source side, until completing defrost；
When S30. switching to heating operation mode after air-conditioning system completion defrost, control system is by comparing coil temperature Tb with presetting
Relationship is to control being turned on and off for wind turbine between fixed temperature value Tbs；
S40. after air-conditioning system enters heating operation, control system then detects coil temperature Tb and environment temperature Tr and thresholding temperature
Relationship between degree △ t is to control wind turbine to be turned on and off；
S50. when coil temperature Tb is less than or equal to the sum of environment temperature Tr and thresholding temperature △ t value, wind turbine opens operation.
3. the control method that a kind of defrost exhaust-heat absorption according to claim 2 recycles, it is characterised in that：
In step S20, defrost is carried out after air-conditioning system meets defrost condition, while wind turbine is closed during defrost；
In step s 30, when coil temperature Tb is less than presetting temperature value Tbs, wind turbine starts, and air-conditioning system passes through heat source side
Heat exchanger absorbs atmospheric heat and carries out heating operation；
In step s 40, when coil temperature Tb is more than the sum of environment temperature Tr and thresholding temperature △ t value, wind turbine remains turned-off,
Air-conditioning system absorbs the heat that heat source side heat exchanger is retained and carries out heating operation；
In step s 40, thresholding temperature △ t adapt to air-conditioning system according to the specification size of air-conditioning system to carry out adjusting accordingly
System keeps Effec-tive Function under the conditions of normal heating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711480671.2A CN108266863B (en) | 2017-12-29 | 2017-12-29 | Defrosting waste heat absorption and reuse control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711480671.2A CN108266863B (en) | 2017-12-29 | 2017-12-29 | Defrosting waste heat absorption and reuse control method |
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| Publication Number | Publication Date |
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| CN108266863A true CN108266863A (en) | 2018-07-10 |
| CN108266863B CN108266863B (en) | 2020-08-28 |
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| CN201711480671.2A Active CN108266863B (en) | 2017-12-29 | 2017-12-29 | Defrosting waste heat absorption and reuse control method |
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| CN108266863B (en) | 2020-08-28 |
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