Defrosting method for heat pump type air conditioner

An air conditioner and heat pump type technology, which is applied in the defrosting field of the heating mode of the air conditioner, can solve the problems of prolonged defrosting time, reduced heating efficiency, and increased defrosting time, so as to improve heating efficiency, ensure heating efficiency, reduce Effect of defrost time

Inactive Publication Date: 2008-11-12
NINGBO AUX ELECTRIC
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AI-Extracted Technical Summary

Problems solved by technology

When the outdoor ambient temperature is too low, this defrosting method will easily cause frequent defrosting of the unit and reduce the heating efficiency; The heater is covered with thick frost, which leads to a sharp decline in the heating effect, and greatly increases the defrosting time. The defrosting efficiency is low, and the defrosting will not be complete, which greatly reduces the heating efficiency.
[0003] A defrosting method for a heat pump air conditioner is disclosed on the website of the State Intellectual Property Office. It determines whether to defrost according to the first temperature difference between the indoor pipe temperature and the room temperature and the second temperature difference and the reference value. It changes the traditional The problem of fixed time in the defrosting method improves the heating efficiency, but because the defrostin...
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Abstract

The invention discloses a defrosting method for a heat-pump type air conditioner, which decides whether the defrosting operation mode, namely setting environment determination temperature t<1> and t<2> and three constants a, b and c, is carried out by combination of coil tube temperature T of an outdoor heat exchanger, outdoor temperature T, actual heating time H and set heating time h; under the following conditions, the unit starts the defrosting operation mode: 1. when T is less than or equal to t<1> and more than or equal to t<2>, if the coil tube temperature T of the outdoor heat exchanger meets the condition of T less than a, T plus c and H larger than h in a continuous M minutes, the unit starts to defrost; 2. when T is less than t<2>, if the coil tube temperature T of the outdoor heat exchanger meets the conditions of T less than b, T plus c and H larger than h in a continuous M minutes, the unit starts to defrost. The defrosting method has the advantages of shortening defrosting time, improving defrosting efficiency, leading to thorough defrosting and greatly improving heating efficiency.

Application Domain

Corrosion preventionRefrigeration components

Technology Topic

Heating timeOutdoor temperature +5

Image

  • Defrosting method for heat pump type air conditioner
  • Defrosting method for heat pump type air conditioner
  • Defrosting method for heat pump type air conditioner

Examples

  • Experimental program(1)

Example Embodiment

[0032] The defrosting method of the heat pump type air conditioner of the present invention will be described in further detail below in conjunction with the drawings and specific embodiments.
[0033] Such as figure 1 , figure 2 , image 3 Shown.
[0034] Set the outdoor heat exchanger coil temperature T z And outdoor ambient temperature T h And actual heating time H y And set the heating time h y It is connected to determine whether to enter the defrost operation mode. According to the outdoor ambient temperature T h 、The temperature Tz of the central coil of the outdoor heat exchanger, the actual heating time H y , Defrost time Hc to defrost.
[0035] Set the following parameters:
[0036] 1. Temperature setting: environmental temperature judgment t 1 , T 2 And three constants a, b, c, defrost end temperature G:
[0037] Preferred: t 1 The range is 8℃~14℃; t 2 The range of is -2°C to 2°C; the range of a is 0 to 0.4; the range of b is 0.6 to 1; the range of c is -10°C to -6°C; the range of G is 14°C to 18°C.
[0038] Best: t 1 12℃; t 2 Is 0°C; a is 0.2; b is 0.8; c is -8°C; G is 16°C;
[0039] 2. Time setting: initial setting heating time h y ’, the maximum heating time h max 、Minimum heating time h min , Set two defrost time h 1 , H 2 , The maximum defrost time h, constant d.
[0040] Preferred: Initially set heating time h y The range of ’is 35~45min; h max The range is 80~140min; h min The range is 25~35min; h 1 The range is 3~4min; h 2 The range of is 4~6min; the range of h is 7~9min; the range of d is 4~6min; the range of L is 0.5~2min; the range of M is 4~6min; the range of K is 6~10min; the range of N It is 10~30s; the range of R is 15~50s.
[0041] Best: Initially set heating time h y ’Is 40min; h max 120min; h min 30min; h 1 3min; h 2 Is 5min; h is 8min; d is 5min; L is 1min; M is 5min; K is 8min; N is 20s; R is 30s.
[0042] See figure 1.
[0043] When T ht 1 When, the unit does not enter the defrost operation mode.
[0044] In the following two situations, the unit enters the defrost operation mode:
[0045] ①, when t 1 ≥T h ≥t 2 If the temperature of the central coil of the outdoor heat exchanger is T z Meet T for continuous M minutes z h +c and H yh y , The unit enters defrosting;
[0046] ②, when T h 2 If the temperature of the central coil of the outdoor heat exchanger is T z Continuous M minutes meet: T z h +c and H yh y , The unit enters defrosting.
[0047] When the unit enters the defrost operation mode, the outdoor compressor stops. After N seconds, the outdoor fan stops, the four-way valve changes direction, and the compressor starts. The auxiliary electric heating of the indoor unit is turned on, and the fan automatically switches to a low wind gear, and runs for L minutes and stop for L minutes.
[0048] Unit defrost end judgment: the temperature of the central coil of the outdoor heat exchanger T zG℃, or defrosting time Hc>K minutes, the defrosting ends.
[0049] At the end of the defrosting of the unit, the indoor auxiliary electric heater is turned off, the indoor fan is turned off, and the outdoor compressor is stopped. After N seconds, the four-way valve changes direction, the fan starts, and the compressor starts.
[0050] See figure 2.
[0051] According to the actual defrost time Hc is greater than the set defrost time h 1 , Or the actual defrost time Hc is less than or equal to the set defrost time h 1 And greater than or equal to the set defrost time h 2 , Or the actual defrost time Hc is greater than the set defrost time h 2 Three different situations, adopt different methods to reconfirm the next heating time h y :
[0052] When Hc>h 1 And h y ≥h min +d, then set the heating time h this time y The heating time h should be set last time y Subtract d; when Hc>h 1 And the heating time h was set last time y min +d, set the heating time h this time y constant;
[0053] When h 1 ≥Hc≥h 2 , Then set the heating time h this time y constant;
[0054] When Hc 2 And h y ≤h max -d, then set the heating time h this time y The heating time h should be set last time y Add d on the basis of;
[0055] When Hc 2 And h yh max -d, set the heating time h this time y constant.
[0056] See image 3.
[0057] When the unit is in heating operation, the outdoor temperature sensor always detects the temperature T of the central coil of the outdoor heat exchanger z And outdoor ambient temperature T h If T ht 1 , Then the unit does not enter the defrost procedure. If t 1 ≥T h ≥t 2 , Then determine T z Whether T has been met for M consecutive minutes z h +c, if it is not satisfied, it will not enter the defrost; when T z Meet T for continuous M minutes z h +c, then determine the actual heating time H y Is it greater than the set heating time h y : If H y ≤h y , Then the unit does not enter defrosting until H yh y , The unit defrosts. If T h 2 , Then determine T z Whether T has been met for M consecutive minutes z h +c, if it is not satisfied, it will not enter the defrost; when T z Meet T for continuous M minutes z h +c, then determine the actual heating time H y Is it greater than the set heating time h y If H y ≤h y , Then the unit does not enter defrosting until H yh y , The unit defrosts. When the unit is defrosting, the outdoor compressor stops. After N seconds, the outdoor fan stops, the four-way valve changes direction, and the compressor starts. The auxiliary electric heating of the indoor unit is turned on, and the fan automatically switches to a low wind gear, and it runs for L minutes and stop for L minutes. Defrost end judgment: the temperature of the central coil of the outdoor heat exchanger T zG℃ or defrosting time Hc>K minutes, the defrosting is over. At the end of defrosting, the indoor auxiliary electric heater is turned off, the indoor fan is turned off, and the outdoor compressor is stopped. After N seconds, the four-way valve changes direction, the fan starts and the compressor starts. After defrosting, adjust the next heating time h according to the actual defrosting time Hc. y. The specific method is as follows: when Hc>h 1 And the heating time h was set last time y ≥h min +d, then set the heating time h this time y The heating time h should be set last time y Subtract d; when Hc>h 1 And set the last heating time h y min +d, set the heating time h this time y Remain unchanged; when h 1 ≥Hc≥h 2 , Then set the heating time h this time y Keep unchanged; when Hc 2 And the heating time h was set last time y ≤h max -d, then set the heating time h this time y Increase d; when Hc 2 And the heating time h was set last time yh max -d, set the heating time h this time y Keep the last set time unchanged.
[0058] Taking the above-mentioned optimal parameters as an example, a complete defrosting process is given below:
[0059] Set heating time h in the first defrost cycle y =h y ’. When the unit is in hot operating state, the temperature sensor located in the middle of the outdoor heat exchanger coil and the outdoor temperature sensor always detect the temperature T of the middle coil of the outdoor heat exchanger. z And outdoor ambient temperature T h If T h12℃, then the controller does not enter the defrost program. If 12℃≥T h ≥0℃, then judge T z Whether T has been satisfied for 5 consecutive minutes z <0.2T h -8℃, if it is not satisfied, it will not enter into defrosting; when T z Meet T for 5 minutes z <0.2T h -8℃, then determine the actual heating time H y Is it greater than the set heating time h y That is 40min, if H y ≤40min, then the unit does not enter the defrost; until H y40min, the unit defrosts. If T h <0℃, then judge T z Whether T has been satisfied for 5 consecutive minutes z <0.8T h -8℃, if it is not satisfied, it will not enter into defrosting; when T z Meet T for 5 minutes z <0.8T h -8℃, then judge the heating time H y Is it greater than the set heating time h y If H y ≤40min, then the unit will not enter defrosting until H y40min, the unit defrosts. When the unit enters the defrosting operation mode, the outdoor compressor stops. After 20 seconds, the outdoor fan stops, the four-way valve changes direction, the compressor starts, the auxiliary electric heating of the indoor unit is turned on, and the fan automatically switches to a low wind gear and keeps on for 1 minute. Stop for 1 minute to run. Defrost end judgment: the temperature of the central coil of the outdoor heat exchanger T z16℃ or defrost time Hc>8 minutes. At the end of defrosting, the indoor auxiliary electric heater is turned off, the indoor fan is turned off, and the outdoor compressor is stopped. After 30 seconds, the four-way valve changes direction, the fan starts, and the compressor starts. After the defrosting is over, adjust the next heating time h according to the defrosting time Hc (the length of this time) y , The specific method is as follows: when Hc>5min and 40min≥30+5(h y ≥h min +d), then the actual heating time h this time y Minus d is h y =40min-5min=35min; when 5min≥Hc≥3min, then set heating time h next time y Keep the actual heating time h y =40min unchanged; when Hc<3min and 40min≤120min-5(h y ≤h max -d), then set the heating time h this time y Increase d or h y =40+5=45.

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