CN101430155B - Hot gas defrosting method for air supply heat pump - Google Patents
Hot gas defrosting method for air supply heat pump Download PDFInfo
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- CN101430155B CN101430155B CN2008102172825A CN200810217282A CN101430155B CN 101430155 B CN101430155 B CN 101430155B CN 2008102172825 A CN2008102172825 A CN 2008102172825A CN 200810217282 A CN200810217282 A CN 200810217282A CN 101430155 B CN101430155 B CN 101430155B
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Abstract
The invention relates to a hot gas defrosting method of an air source heat pump. The air source heat pump comprises a controller, a compressor, an evaporator, an expansion valve, a condenser, a circulating pump and an electric control valve. The defrosting method comprises the following steps: the controller controls the electric control valve, the compressor, the evaporator and the circulating pump to act sequentially and perform the following sequential steps repeatedly and alternately: heating, opening the valves to stop heating, defrosting, and closing the valves; and the hot gas defrosting method further comprises the following steps: A) the controller records the time T1 of the heating step in the previous circle and the time t consumed in the subsequent defrosting step; and B) the time T2 of the heating step in the next circle is set after computation according to the optimum defrosting time b which is obtained by experiments. Aiming at the disadvantages of the prior art, the air source heat pump can automatically adjust heating operation period, defrosting start time and defrosting time according to the ambient conditions by the hot gas defrosting method so as to obtain the optimum energy efficiency ratio.
Description
Technical field
The present invention relates to a kind of heat-pump apparatus, more particularly, the present invention relates to a kind of hot gas defrosting equipment and control method thereof of air supply heat pump.
Background technology
When air source heat pump moved at microthermal climate, temperature and humidity reached certain condition, will produce frosting at evaporator surface, As time goes on, if the frost layer is not removed, the frosting meeting is more and more thicker, so that influence the heating performance of heat pump gradually, until heating work.
The frosting meeting makes the heat exchange property of evaporimeter descend, and increases the energy consumption that heats, so when frosting needs the additive decrementation energy to a certain degree the time frost of evaporimeter layer is removed, recovery heats again.Present traditional hot gas defrosting control way commonly used is to set a fixing heating operation cycle, after the cycle of operation finishes, enter defrosting, reenter the heating operation cycle afterwards again until reaching defrosting exit criteria (for example the coil temperature of evaporimeter gos up to setting value).
But because the frosting degree of heat pump is subjected to the influence of ambient air temperature, ambient humidity or the like factor, if and consider the Energy Efficiency Ratio of defrosting, then in Chu Shuan opportunity and the selection consuming time, just following problem may appear: if too early, frequent excessively defrosting, though can guarantee source pump not the reason frosting thicken and cause the work that can't heat, but can consume too much energy in the defrosting action, waste energy; Slowly do not defrost if heat overlong time, then might cause low-voltage variation to trip because of frosting is blocked up, perhaps blocked up frost layer influences the evaporimeter heat exchange, and then influences performance.Obviously, the fixing heating operation cycle of conventional method can't accurately be reflected the frosting situation of evaporimeter, when for example the environment temperature low humidity is big, the frosting situation of evaporimeter seriously surpasss the expectation after cycle of operation, blocked up frost layer has influenced the performance that heats, and will cause unnecessary energy consumption; For example the humidity of environment is low again, and evaporimeter frosting seldom at this time enters the words of defrosting and unnecessary after cycle of operation, can cause energy waste equally.
How dynamically adjusting the cycle of operation to reach the degree of accurate judgement frosting, defrost in suitable, make system's operation more energy-conservation, is that defrost control system need be made great efforts improved direction.
Summary of the invention
Above-mentioned shortcoming at prior art, the objective of the invention is to provide a kind of hot gas defrosting method for air supply heat pump, this method has following advantage: can adjust heating operation cycle and defrosting opportunity automatically and defrost consuming timely according to ambient conditions, and then obtain best Energy Efficiency Ratio.
For this reason, one of technical solution of the present invention is a kind of hot gas defrosting method for air supply heat pump, this air supply heat pump comprises controller, compressor, evaporimeter, expansion valve, condenser, circulating pump and electrically-controlled valve, the import of this compressor is being communicated with the refrigerant port A1 of described evaporimeter, and the outlet of compressor is being communicated with the port C1 of described electrically-controlled valve and the refrigerant port B1 of condenser, and the other port C2 of this electrically-controlled valve is being communicated with another refrigerant port A2 of described evaporimeter, the refrigerant port A2 of described condenser other refrigerant port B2 and evaporimeter is interconnected by described expansion valve, described controller is connecting electrically-controlled valve respectively, compressor, evaporimeter, the on-off circuit of circulating pump, described Defrost method comprises: controller is being controlled described electrically-controlled valve, compressor, evaporimeter, circulating pump moves in an orderly manner, back and forth alternately carry out following sequential steps: heat, driving valve stops to heat, defrosting, close valve, and described hot gas defrost method comprises the steps: A) last round of time T 1 and the subsequent defrosting step t consuming time that heats step of described controller record; B) adopt the best of experiment gained b consuming time that defrosts, calculate the back and set the time T 2 that next round heats step.
Defrost method of the present invention adopts the historical data that heats step time T 1 and subsequent defrosting step t consuming time as the reference data, utilizes the best that records under the setting operating mode to defrost b consuming time as standard; Determine because the mensuration of best defrosting b consuming time is the best frosting thickness according to microcosmic, therefore can optimally calculate the best that next preparation carries out and heat step time T 2.Carry out so repeatedly, make each new treat row heat step time T 2 all remain on substantially best defrosting b consuming time or near.Compared with prior art, Defrost control method of the present invention is by with in the last heating operation cycle and the pre-set function of defrosting substitution consuming time and calculate the next heating operation cycle, the heating operation cycle can be adjusted according to actual condition, make the degree of each frosting reach the optimized effect of expection.Can make the Energy Efficiency Ratio that heats reach optimal design, energy savings.
Through in temperature be 1 ℃, relative humidity be 83% and temperature be that 6 ℃, relative humidity are test proof relatively under 60% the change conditions: the Energy Efficiency Ratio of tradition defrosting is below 2.5, and the Energy Efficiency Ratio of the defrosting of the inventive method is not less than 2.8, and the defrosting energy-saving effect of the inventive method is obvious.
Defrost method of the present invention also comprises following concrete improvement:
Among the described step B, described best defrosting b consuming time is C and obtaining as follows: starting described air supply heat pump is setting the operation of carrying out different heating operation period T s under the operating mode, write down the defrosting ts consuming time behind each heating operation period T s, calculate the corresponding Energy Efficiency Ratio of described air supply heat pump then, therefrom choosing the highest defrosting of Energy Efficiency Ratio consuming time is best defrosting b consuming time.The corresponding best frosting thickness of described best defrosting b consuming time, also corresponding best heating energy efficiency ratio.
By a large amount of above-mentioned experiments, repeatedly to recently obtaining best frost thickness and defrosting at this moment, to obtain best Energy Efficiency Ratio.Similarly, after obtaining best frost thickness, our reasoning draws under the roughly constant situation of defrosting power, defrosting time is the reflection of frost thickness just, add the PID control device, the present invention can reasonably adjust the length of heating operation cycle and defrosting time, and then obtains best Energy Efficiency Ratio.The thinking of setting out of this energy Defrost technology of our exploitation that Here it is.
Determine method opportunity as the preferable defrosting of the present invention.Among the described step B, the formula of described calculating is: T2=T1 ÷ t * b.
For further increasing the inventive method practical on traditional type, the described valve of opening stops to heat in the step, described compressor continuous running, and described controller stops described evaporator fan and circulating pump, begins the defrosting running; In the valve step of described pass, described compressor continuous running, described controller starts described evaporator fan and circulating pump, begins to heat running.
The described valve of opening stops to heat in the step, and described controller is controlled described electrically-controlled valve, makes the outlet of compressor directly be communicated with the refrigerant port A2 of evaporimeter.
State and close in the valve step, described controller is controlled described electrically-controlled valve, makes being communicated with of refrigerant port A2 of outlet disconnection and condenser of compressor.
For increasing and guarantee the control accuracy of the inventive method, the time of day of described T1, t, b is accurate to second.
Guarantee applying of the inventive method for more effective, described step C carried out before the air supply heat pump of every kind of model dispatches from the factory and finishes.
For make the inventive method stable, effective, flexible, practical more from hardware unit, described controller comprises single-chip microprocessor MCU, is stored in after described best defrosting b consuming time sets in the memory of single-chip microprocessor MCU of described controller.
The invention will be further described below in conjunction with the drawings and specific embodiments.
Description of drawings
Fig. 1 is the structural representation of heat pump hot gas defrosting device embodiment of the present invention.
Fig. 2,3 is respectively the effect schematic diagram of heat pump hot gas defrost method of the present invention.
Fig. 4,5 is respectively the effect schematic diagram of conventional heat pump hot gas defrost method.
The specific embodiment
Heat pump defrosting device embodiment:
As Fig. 1, be depicted as the structural representation of heat pump hot gas defrosting device embodiment of the present invention.It comprises that this air supply heat pump comprises controller (not shown), compressor, evaporimeter, expansion valve, condenser, circulating pump and electrically-controlled valve, described controller comprises single-chip microprocessor MCU, is stored in after described best defrosting b consuming time sets in the memory of single-chip microprocessor MCU of described controller.
The import of this compressor is being communicated with the refrigerant port A1 of described evaporimeter, and the outlet of compressor is being communicated with the port C1 of described electrically-controlled valve and the refrigerant port B1 of condenser, and the other port C2 of this electrically-controlled valve is being communicated with another refrigerant port A2 of described evaporimeter, the refrigerant port A2 of described condenser other refrigerant port B2 and evaporimeter is interconnected by described expansion valve, described controller is connecting electrically-controlled valve respectively, compressor, evaporimeter, the on-off circuit of circulating pump (not detailed showing), described Defrost method comprises: controller is being controlled described electrically-controlled valve, compressor, evaporimeter, circulating pump moves in an orderly manner, back and forth alternately carry out following sequential steps: heat, driving valve stops to heat, defrosting, close valve
The described valve of opening stops to heat in the step, described controller is controlled described electrically-controlled valve, make the outlet of compressor directly be communicated with the refrigerant port A2 of evaporimeter, described compressor continuous running, described controller stops described evaporator fan and circulating pump, begin the defrosting running, refrigerant flows to shown in dotted arrow; In the valve step of described pass, described controller is controlled described electrically-controlled valve, make being communicated with of refrigerant port A2 of outlet disconnection and condenser of compressor, described compressor continuous running, described controller starts described evaporator fan and circulating pump, begin to heat running, refrigerant flows to shown in the solid line arrow.
Defrost method embodiment:
As Fig. 2,3, shown in be respectively the effect schematic diagram of heat pump hot gas defrost method of the present invention, Defrost method setup parameter of the present invention is as follows: initial 50 minutes heating operation cycles, best defrosting b=3 consuming time minute=180 seconds.Fig. 2 drops to 1 ℃ of (relative humidity 83%) situation for ambient air temperature from 6 ℃ (relative humidity 60%), and defrosting time rose to 4 minutes by 3 minutes, and according to formula 3/4*50=37.5=38 minute, intelligent defrosting control shortened to 38 minutes with the heating operation cycle.Fig. 3 rises to 6 ℃ of (relative humidity 60%) situations for ambient air temperature from 1 ℃ (relative humidity 83%), according to formula 4/3*50=66.6=67 minute, defrosting time rose to 3 minutes by 4 minutes, intelligent defrosting control is 67 minutes with the heating operation cycle stretch-out, through adjusting by wheel, can be so that the Defrost operation cycle equals all the time or near the b value.Show that the inventive method control air supply heat pump of the present invention heats the time along with temperature/humidity changes flexible modulation.
Fig. 4,5 is respectively the effect schematic diagram of conventional heat pump hot gas defrost method, and for ease of comparing, conventional heat pump defrosting parameter is carried out initial value equally according to the parameter of the inventive method.By Fig. 4,5 as seen: no matter ambient air temperature drops to 1 ℃ (relative humidity 83%) from 6 ℃ (relative humidity 60%), perhaps, ambient air temperature rises to 6 ℃ of (relative humidity 60%) situations from 1 ℃ (relative humidity 83%), remain 50 minutes heating operation cycles, but defrosting time alters a great deal, and the present invention can shorten accordingly or prolong the heating operation cycle according to the variation of environmental working condition.Two-phase is calculated the back proof: Defrost method of the present invention exceeds 10-12% than the defrosting Energy Efficiency Ratio of conventional heat pump Defrost method.
Claims (10)
1. hot gas defrosting method for air supply heat pump, this air supply heat pump comprises controller, compressor, evaporimeter, expansion valve, condenser, circulating pump and electrically-controlled valve, the import of this compressor is being communicated with the refrigerant port A1 of described evaporimeter, and the outlet of compressor is being communicated with the port C1 of described electrically-controlled valve and the refrigerant port B1 of condenser, and the other port C2 of this electrically-controlled valve is being communicated with another refrigerant port A2 of described evaporimeter, the refrigerant port A2 of described condenser other refrigerant port B2 and evaporimeter is interconnected by described expansion valve, described controller is connecting electrically-controlled valve respectively, compressor, evaporimeter, the on-off circuit of circulating pump, it is characterized in that: described hot gas defrost method comprises: controller is being controlled described electrically-controlled valve, compressor, evaporimeter, circulating pump moves in an orderly manner, back and forth alternately carry out following sequential steps: heat, driving valve stops to heat, defrosting, close valve, described hot gas defrost method also comprises the steps: A) last round of time T 1 and the subsequent defrosting step t consuming time that heats step of described controller record; B) adopt the best of experiment gained b consuming time that defrosts, calculate the back and set the time T 2 that next round heats step.
2. hot gas defrosting method for air supply heat pump as claimed in claim 1, it is characterized in that: among the described step B, described best defrosting b consuming time is C and obtaining as follows: starting described air supply heat pump is setting the operation of carrying out different heating operation period T s under the operating mode, write down the defrosting ts consuming time behind each heating operation period T s, calculate the corresponding Energy Efficiency Ratio of described air supply heat pump then, therefrom choosing the highest defrosting of Energy Efficiency Ratio consuming time is best defrosting b consuming time.
3. hot gas defrosting method for air supply heat pump as claimed in claim 1 or 2 is characterized in that: the corresponding best frosting thickness of described best defrosting b consuming time, also corresponding best heating energy efficiency ratio.
4. hot gas defrosting method for air supply heat pump as claimed in claim 1 is characterized in that: among the described step B, the formula of described calculating is: T2=T1 ÷ t * b.
5. hot gas defrosting method for air supply heat pump as claimed in claim 1 is characterized in that: the described valve of opening stops to heat in the step, described compressor continuous running, and described controller stops described evaporator fan and circulating pump, begins the defrosting running; In the valve step of described pass, described compressor continuous running, described controller starts described evaporator fan and circulating pump, begins to heat running.
6. hot gas defrosting method for air supply heat pump as claimed in claim 1 is characterized in that: the described valve of opening stops to heat in the step, and described controller is controlled described electrically-controlled valve, makes the outlet of compressor directly be communicated with the refrigerant port A2 of evaporimeter.
7. hot gas defrosting method for air supply heat pump as claimed in claim 1 is characterized in that: in the valve step of described pass, described controller is controlled described electrically-controlled valve, makes being communicated with of refrigerant port A2 of outlet disconnection and condenser of compressor.
8. hot gas defrosting method for air supply heat pump as claimed in claim 1 is characterized in that: the time of day of described T1, t, b is accurate to second.
9. hot gas defrosting method for air supply heat pump as claimed in claim 2 is characterized in that: described step C carried out before the air supply heat pump of every kind of model dispatches from the factory and finishes.
10. hot gas defrosting method for air supply heat pump as claimed in claim 2 is characterized in that: described controller comprises single-chip microprocessor MCU, is stored in after described best defrosting b consuming time sets in the memory of single-chip microprocessor MCU of described controller.
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| CN2008102172825A CN101430155B (en) | 2008-11-11 | 2008-11-11 | Hot gas defrosting method for air supply heat pump |
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| CN2008102172825A CN101430155B (en) | 2008-11-11 | 2008-11-11 | Hot gas defrosting method for air supply heat pump |
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| CN101430155B true CN101430155B (en) | 2011-01-05 |
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| CN109959118A (en) * | 2018-12-18 | 2019-07-02 | 青岛经济技术开发区海尔热水器有限公司 | A kind of defrosting control method and air source heat pump system |
| CN109974200A (en) * | 2018-12-18 | 2019-07-05 | 青岛经济技术开发区海尔热水器有限公司 | A kind of defrosting control method and air source heat pump system |
| CN109654774A (en) * | 2018-12-18 | 2019-04-19 | 青岛经济技术开发区海尔热水器有限公司 | A kind of defrosting control method and air source heat pump system |
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Owner name: SHENZHEN POWER WORLD NEW ENERGY TECHNOLOGY CO., LT Free format text: FORMER NAME: SHENZHEN POWER WORLD MACHINERY EQUIPMENT CO., LTD. |
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Address after: 518104 Guangdong Province, Shenzhen Baoan District manhole after Mao Ting Zhoushan Fourth Industrial Zone No. 24 Patentee after: Shenzhen Power World New Energy Technology Co., Ltd. Address before: 518104 Guangdong Province, Shenzhen Baoan District manhole after Mao Ting Zhoushan Fourth Industrial Zone No. 24 Patentee before: Shenzhen Powerworld Machinery Equipment Co., Ltd. |
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Address after: 518104 Guangdong Province, Shenzhen Baoan District manhole after Pavilion Fourth Industrial Zone No. 24 Patentee after: Shenzhen pariworld new energy Polytron Technologies Inc Address before: 518104 Guangdong Province, Shenzhen Baoan District manhole after Mao Ting Zhoushan Fourth Industrial Zone No. 24 Patentee before: Shenzhen Power World New Energy Technology Co., Ltd. |
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