Summary of the invention
The object of the invention is to overcome above problem, provide a kind of according to the indoor temperature change generated in case amount, indoor temperature and target setting temperature gap, and set indoor set blower fan shelves speed in conjunction with the user, determine the control method of air-conditioner operating frequency, and can control promptness and the sensitivity that improves control by the interval of adjusting detected temperatures, and can be according to the difference of refrigerating/heating, the direction and the amplitude of adjusting frequency and changing, thus satisfy the comfort requirement of user's reality.
A kind of control method of transducer air conditioning comprises the steps:
A: detect temperature T a (n) in the room, read user's design temperature Tsc, calculate temperature difference absolute value delta T with target temperature;
B: read temperature T a (n-1) in the last room that detects, variation of temperature difference Δ T ' in the room of calculating and current detection;
C:, or preestablish the curve calculation frequency conversion increment Delta fi (n) of the Δ T-Δ fi (n) under the corresponding different Δ T ' according to the curve that preestablishes the Δ T '-Δ fi (n) under the corresponding different Δ T;
The curve of described Δ T '-Δ fi (n), for when Δ T one regularly, Δ fi (n) remains unchanged greatly along with Δ T ' change or diminishes, and along with | Δ T ' | change big, and | Δ fi (n)
Δ T-Δ fi (n)
Δ T=0| also become big, promptly when the absolute value increase of Δ T ', the absolute value of the Δ fi (n) of this Δ T correspondence difference of corresponding Δ fi (n) during with Δ T=0 also increases.
The curve of described Δ T-Δ fi (n), for when Δ T ' regularly, Δ fi (n) remains unchanged greatly along with the change of Δ T or becomes big, and along with | the change of Δ T| is big, and | Δ fi (n)
Δ T '-Δ fi (n)
Δ T '=0| also become big; Promptly when the absolute value of Δ T increases, the absolute value of the difference of the Δ fi (n) that the Δ fi (n) of this Δ T ' correspondence and Δ T '=0 are o'clock corresponding also increases.
D: when frequency conversion increment Delta fi (n)>0, employing formula one: fi (n)=MAX (fi (n-1), fmin)+Δ fi (n), calculate new target frequency; When frequency conversion increment Delta fi (n)=0, adopt formula two: fi (n)=fi (n-1), calculate new target frequency; When frequency conversion increment Delta fi (n)<0, adopt formula three: fi (n)=MIN (frun, fi (n-1))+Δ fi (n), calculate new target frequency;
Described fi (n-1) is setpoint frequency last time, and described fmin is minimum running frequency, and described frun is current running frequency;
E: the frequency that changes compressor according to new target frequency.
The curve of Δ T '-Δ fi (n) further is described, the curve of described Δ T '-Δ fi (n) is corresponding to fixing Δ T, and its frequency conversion increment Delta fi (n) reduces along with the increase of Δ T '; The curve of described Δ T '-Δ fi (n) is along with the increase of corresponding temperature difference Δ T, and its position on ordinate raises.The Δ T of the curve correspondence of Δ T '-Δ fi (n) is 0 and greater than 0 o'clock, and Δ fi (n) is identical in the change direction of cooling condition and heating condition, and Δ fi (n) is close in the amplitude of the variation of cooling condition and heating condition.The Δ T of the curve correspondence of Δ T '-Δ fi (n) is less than 0 o'clock, and Δ fi (n) curve of cooling condition is in the below of heating condition Δ fi (n) curve, and the absolute value of cooling condition Δ fi (n) is greater than the absolute value of heating condition Δ fi (n).
Further, introduce air volume coefficient K in the formula of steps d, described formula one is fi (n)=MAX (fi (n-1), fmin)+K Δ fi (n), wherein K is an air volume coefficient, and the rotating speed of setting indoor fan as the user is that the span of K is 0.3<K<0.9 when hanging down the wind shelves; When the rotating speed of setting indoor fan as the user was the apoplexy shelves, the span of K was 0.9≤K<1.1; When the rotating speed of setting indoor fan as the user was high wind shelves, the span of K was 1.1≤K<2.0.Introduce air volume coefficient K in the formula of steps d, described formula three is fi (n)=MIN (frun, fi (n-1))+K Δ fi (n), and wherein K is an air volume coefficient, and the rotating speed of setting indoor fan as the user is that the span of K is 0.3<K<0.9 when hanging down the wind shelves; When the rotating speed of setting indoor fan as the user was the apoplexy shelves, the span of K was 0.9≤K<1.1; When the rotating speed of setting indoor fan as the user was high wind shelves, the span of K was 1.1≤K<2.0.
Under the another kind of situation, the rotating speed of setting indoor fan as the user is an automatic transmission, and described frequency-converting control device can change air volume coefficient K according to the wind shelves situation of the blower fan of reality, and when the rotating speed of indoor fan during for low wind shelves, the span of K is 0.3<K<0.9; When the rotating speed of indoor fan was the apoplexy shelves, the span of K was 0.9≤K<1.1; When the rotating speed of indoor fan was high wind shelves, the span of K was 1.1≤K<2.0.
Further, the detection time between described indoor detected temperatures Ta (n) and the last indoor detected temperatures Ta (n-1), under the high situation of current air-conditioner operating frequency, shortened this detection time at interval at interval; Under the low situation of current air-conditioner operating frequency, this detection time is elongated at interval.Be spaced apart 0.1~30 minute described detection time.
The present invention compared with prior art, its beneficial effect is: by indoor temperature and target setting temperature gap, and set indoor set blower fan shelves speed in conjunction with the user, determine the control method of air-conditioner operating frequency, and can control promptness and the sensitivity that improves control by the interval of adjusting detected temperatures, and can be according to the difference of refrigerating/heating, the direction and the amplitude of adjusting frequency and changing, thus satisfy the comfort requirement of user's reality.
The specific embodiment
Below with reference to the accompanying drawings, describe the specific embodiment of the present invention in detail.
Fig. 1 is the flow chart of the embodiment one of employing transducer air conditioning control method of the present invention, and the step of its control is described as follows:
At first, carry out step a, detect temperature T a (n) in the room, read user's design temperature Tsc, calculate temperature difference Δ T with target temperature, temperature is detected by the temperature-detecting device in the room indoor set in the room in this step, according to the sense cycle of controller, writes down the detected value of each time, as, writing down the n time detected value Ta (n), is Ta (n-1) at the detected value of a last sense cycle, by that analogy.The air-conditioning target temperature that user's design temperature Tsc sets for the user, promptly the user wishes the temperature that air-conditioner control indoor temperature reaches.Calculate temperature difference Δ T with target temperature, promptly calculate the difference of current indoor temperature Ta (n) and design temperature, because size and positive and negative direction and the amplitude that directly has influence on VFC of this difference DELTA T, and calculate and the convenience of frequency conversion increase and decrease direction and amplitude relatively for this patent, simultaneously, so the application that takes into account refrigeration and heat is in the present invention, this temperature difference Δ T is for heating condition and heat for the curve Δ T=Tsc-Ta (n); This temperature difference Δ T for cooling condition and the refrigeration curve for, Δ T=-(Tsc-Ta (n)).
Carry out step b, read temperature T a (n-1) in the last room that detects, variation of temperature difference Δ T ' in the calculated room; As mentioned above, the indoor set temperature-detecting device stores last detected value Ta (n-1), controller reads the record Ta (n-1) that is stored in the temperature-detecting device, and and indoor temperature Ta (n) calculated room of this detection in variation of temperature difference Δ T ', equally, because size and positive and negative direction and the amplitude that directly has influence on VFC of this difference DELTA T ', and calculate and the convenience of frequency conversion increase and decrease direction and amplitude relatively for this patent, simultaneously, the application that takes into account refrigeration and heat, so in the present invention, this temperature difference Δ T ' is for heating condition with heat for the curve Δ T '=Ta (n)-Ta (n-1); This temperature difference Δ T ' for cooling condition and the refrigeration curve for, Δ T '=-(Ta (n)-Ta (n-1)).
Carry out step c, the curve according to room temperature difference in change Δ T '-frequency conversion increment Delta fi (n) of corresponding temperature difference Δ T draws frequency conversion increment Delta fi (n); According to calculate with target temperature difference Δ T, can be frequency conversion increment Delta fi (n) at ordinate, the unit of frequency conversion increment Delta fi (n) is a base unit among the present invention, each base unit is represented the some frequencies in 0.3~15 hertz of scope, in the present embodiment, a base unit is represented 4.0 hertz, and abscissa is that room temperature difference in change Δ T ' finds its corresponding curve, and is extremely shown in Figure 6 as Fig. 2.When being Δ T=0 with Fig. 2 heating condition H1, the change curve of room temperature difference in change Δ T '-frequency conversion increment Delta fi (n), value according to current Δ T ', the value that can correspondence finds frequency conversion increment Delta fi (n), when the scope of Δ T ' in-0.5<Δ T '<0.5, frequency conversion increment Delta fi (n) is a zero-base our unit, promptly zero hertz, when Δ T ' more than or equal to 0.5 the time, frequency conversion increment Delta fi (n) is greater than zero; When Δ T ' smaller or equal to-0.5 the time, frequency conversion increment Delta fi (n) is less than zero, promptly frequency reduces.From the temperature conditions of reality, when the current indoor temperature of Δ T=0 explanation has reached design temperature, so under the very little situation of indoor temperature change generated in case, be frequency not to be made change, i.e. frequency conversion increment Delta fi (n) is zero; When the variation that has occurred room temperature detection time at interval at more than or equal to 0.5 degree (increase or reduce), then need frequency is done suitable increase and decrease, can see at Δ T ' in 0.5≤Δ T '<1 scope and Δ T ' situation in-0.5 〉=Δ T '>-1, the value added of frequency conversion increment Delta fi (n) is all little, it is 0.5 base unit, be 2 hertz, this meets the requirement that keeps temperature stabilization.Increase or the increase of minimizing numerical value as Δ T ', as, Δ T ' 〉=1, perhaps Δ T '≤1, illustrate that then load emergency case jumpy has appearred in the interior space, such as: open the door, window etc., need there be bigger variation to deal with the rapid variation of interior space load to frequency, at this time the change curve from room temperature difference in change Δ T '-frequency conversion increment Delta fi (n) reflects: the absolute value of the value added of frequency conversion increment Delta fi (n) significantly increases, so that the variation of cold/thermic load can be eliminated as early as possible.When H2 is Δ T=2.5 among Fig. 2, the change curve of room temperature difference in change Δ T '-frequency conversion increment Delta fi (n), the change direction of its each temperature nodes is identical with H1; Compare the increase along with corresponding temperature difference Δ T with H1, its position on ordinate raises.
With Fig. 4 cooling condition is the example analysis, for the ease of relatively, wherein temperature difference Δ T for cooling condition and refrigeration curve, Δ T=-(Tsc-Ta (n)); Temperature difference Δ T ' for cooling condition and the refrigeration curve for, Δ T '=-(Ta (n)-Ta (n-1)).When C1 is Δ T=0, the change curve of room temperature difference in change Δ T '-frequency conversion increment Delta fi (n), according to the value of current Δ T ', can correspondence find the value of frequency conversion increment Delta fi (n), in the present embodiment, a base unit is represented 4 hertz,, as Δ T ' during at-0.5<Δ T '<0.5 scope, frequency conversion increment Delta fi (n) is zero, when Δ T ' more than or equal to 0.5 the time, frequency conversion increment Delta fi (n) is greater than zero; When Δ T ' smaller or equal to-0.5 the time, frequency conversion increment Delta fi (n) is less than zero, promptly frequency reduces.From the temperature conditions of reality, when the current indoor temperature of Δ T=0 explanation has reached design temperature, so under the very little situation of indoor temperature change generated in case, be frequency not to be made change, i.e. frequency conversion increment Delta fi (n) is zero; When the variation that has occurred room temperature detection time at interval at more than or equal to 0.5 degree (increase or reduce), then need frequency is done suitable increase and decrease, can see at Δ T ' in the scope of 0.5≤Δ T '<1 and Δ T ' in the scope of-0.5 〉=Δ T>-1 time, frequency conversion increment Delta fi (n) is 0.5 base unit, be 2 hertz, value added is all little, and this meets the requirement that keeps temperature stabilization.When the increase of Δ T ' or reduce numerical value and further increase, as, Δ T ' is more than or equal to 1, perhaps Δ T ' is smaller or equal to-1, illustrate that then load emergency case jumpy has appearred in the interior space, such as: open the door, window etc., need there be bigger variation to deal with the rapid variation of interior space load to frequency, at this time the change curve from room temperature difference in change Δ T '-frequency conversion increment Delta fi (n) reflects: frequency conversion increment Delta fi (n) is 2.2 base units, be 8.8 hertz, the absolute value of value added significantly increases, so that the variation of cold/thermic load can be eliminated very soon.
Disclosed by the invention is curve according to room temperature difference in change Δ T '-frequency conversion increment Delta fi (n) of temperature difference Δ T, draw frequency conversion increment Delta fi (n), equally, also can be according to the curve of the temperature difference Δ T-frequency conversion increment Delta fi (n) of corresponding room temperature difference in change Δ T ', draw frequency conversion increment Delta fi (n), the work that both finish is identical, also is equivalent.
Carry out steps d, steps d is further to judge to adopt what formula to calculate new frequency, is divided into d10-d14 etc. step by step; At first carry out steps d 10, the Δ fi (n) that finds according to step c judges, when Δ fi (n) greater than 0, then carry out steps d 11; When Δ fi (n) is not more than 0, then carry out steps d 12;
Carry out steps d 11, adopt formula one: fi (n)=MAX (fi (n-1), fmin)+Δ fi (n), calculate new target frequency, formula one be meant when Δ fi (n) greater than 0 the time, select a frequency as base frequency MAX (fi (n-1), fmin), add the increment Delta fi (n) of frequency, and that base frequency is selected between minimum running frequency fmin and setpoint frequency fi last time (n-1) is bigger, as the base frequency of this setpoint frequency, and new target frequency be base frequency and frequency increment and, enter step e then;
Carry out steps d 12, the Δ fi (n) that finds according to step c judges, when Δ fi (n) less than 0, then carry out steps d 13; When Δ fi (n) is not less than 0, then carry out steps d 14;
Carry out steps d 13, adopt formula three: fi (n)=MIN (frun, fi (n-1))+Δ fi (n), calculate new target frequency, formula three be meant when Δ fi (n) less than 0 the time, select a frequency as base frequency MIN (frun, fi (n-1)), add the increment Delta fi (n) of frequency, and that base frequency is selected between current running frequency frun and setpoint frequency fi last time (n-1) is less, as the base frequency of this setpoint frequency, and new target frequency be base frequency and frequency increment and, because Δ fi (n) is less than 0, mean that needs reduce current frequency,, and add minus Δ fi (n) so between current running frequency frun and setpoint frequency fi last time (n-1), select lessly, in the hope of reducing target frequency as soon as possible, enter step e then;
Carry out steps d 14, adopt formula two: fi (n)=fi (n-1)+Δ fi (n), calculate new target frequency, promptly as Δ fi (n) when equaling 0, select the last time setpoint frequency as base frequency, add that frequency increment is as new target frequency, current indoor temperature is more stable, and Δ fi (n)=0 is equivalent to still keep original target setting frequency, enters step e then;
Enter step e, change the frequency of compressor according to new target frequency fi (n).
Be lower than design temperature (cooling condition) or indoor temperature occurs and be higher than design temperature (heating condition) when indoor temperature occurring, be Δ T less than 0 situation, can select suitable Δ fi (n) according to the change curve of Fig. 3 or the disclosed room temperature difference in change of Fig. 5 Δ T '-frequency conversion increment Delta fi (n), describe as step c and later step, thereby set the frequency that the target frequency fi (n) that makes new advances changes compressor.Like this, equally can be when big temperature fluctuation occurring, adopt big Δ fi (n) to make more effective design temperature that reaches the user more timely.
Room variations in temperature difference Δ T '-change curve of frequency conversion increment Delta fi (n) all is to have passed through a large amount of experimental verifications under the different Δ T that adopt among the present invention, the numerical value of frequency conversion increment Delta fi (n) in each variations in temperature wherein, all be comfortableness and the most effective numerical value that reaches human body comfort and confirm of air-conditioner, embodied the frequency change scheme that transducer air conditioning reaches the human body comfort optimum in conjunction with the sense of human body body.
Concerning between Δ T-Δ T '-Δ fi (n) three itself reflected situation about changing, when the variable quantity of Δ T or Δ T ' increases, the variable quantity of Δ fi (n) also can increase, fully open in this patent, concrete numerical value is because variation of temperature is the unit of minimum with 0.5 degree just generally, and each Δ T has only the Δ T ' of 5 correspondences, and the total quantity of Δ T also has only 11, and the quantity that discloses is a lot, can satisfy the demand of reflection variation tendency.
Embodiments of the invention two have been introduced air volume coefficient K in the formula of steps d, set in the running status process of air-conditioning the user, temperature and air quantity (wind shelves situation) all are important index, general air conditioner room unit air quantity is divided into the 3-5 shelves, blower fan adopts different rotating speeds, thereby produce different indoor air quantity, the user can select a certain air quantity for use or adopt automatic wind (the wind shelves are related with Δ T), modally be generally 3 grades, be high wind shelves, the apoplexy shelves, low wind shelves, with modal refrigerating capacity is that the secondary efficiency air-conditioning of 2600W is an example, and its high wind shelves air quantity scope is 460~500 cubic metres/hour; Apoplexy shelves air quantity scope is 390~450 cubic metres/hour; Low wind shelves air quantity scope is 320~380 cubic metres/hour.
Wherein, the size of air quantity is indicating the take notice of degree of user to noise, reaches the degree of taking notice of to wind speed in the room and room temperature variation.When the user selects to hang down the wind shelves,, and do not need blowing feeling and dislike the big variation of temperature so the user needs low noise; When the user selects high wind shelves,, and pay no attention to blowing feeling and variation of temperature so the user not too takes notice of the size of noise.So, present embodiment two is by introducing the variable quantity that air volume coefficient K regulates Δ fi (n), in steps d, the formula one of d11 is fi (n)=MAX (fi (n-1) step by step, fmin)+K Δ fi (n), the formula one of d13 is fi (n)=MIN (frun step by step, fi (n-1))+K Δ fi (n), in present embodiment two, the rotating speed of setting indoor fan as the user is during for low wind shelves, and the value of K is 0.5, when the rotating speed of setting indoor fan as the user is the apoplexy shelves, the value of K is 1, when the rotating speed of setting indoor fan as the user was high wind shelves, the value of K was 1.2, when the rotating speed of setting indoor fan as the user is automatic transmission, described frequency-converting control device can change air volume coefficient K according to the wind shelves situation of the blower fan of reality, and concrete numerical value as mentioned above.Shown in Figure 6, original curve is H2, the curve of room temperature difference in change Δ T '-frequency conversion increment Delta fi (n) when this curve is represented Δ T=2.5, and when K=1, the room temperature difference in change Δ T ' of embodiment two-frequency conversion increment Delta fi (n) curve overlaps with the H2 curve; When the user set high wind shelves, the value of K was 1.2, and the actual selected curve of Δ fi (n) is the dotted line shown in the H10 among the figure, and the position of its each point is higher by 20% than H2 curve; When the user set low wind shelves, the value of K was 0.5, and the actual selected curve of Δ fi (n) is the chain-dotted line shown in the H11 among the figure, and the position of its each point is than H2 curve low 50%.The K value that present embodiment three adopts is different with embodiment two, and the K value of corresponding low-medium-high level wind speed is 0.6,1.1,1.8.From embodiment as can be seen, the disclosed technical scheme of present embodiment can be used to adopt the situation of 4 grades or 5 grades equally.
Embodiments of the invention four are with above embodiment difference, change the detection time that its indoor temperature checkout gear carries out between indoor detected temperatures Ta (n) and the last indoor detected temperatures Ta (n-1) at interval, under the high situation of current air-conditioner operating frequency, shorten this detection time at interval; Under the low situation of current air-conditioner operating frequency, this detection time is elongated at interval.Like this can be under the high situation of operating frequency, increase timely or reduce frequency timely, avoid changing bigger frequency Δ fi (n) under the high frequency operating mode, to the impact of equipment; Can reach simultaneously the frequency of the comfortable needs of user faster.The detection time of the scope at interval that the indoor temperature checkout gear carries out between indoor detected temperatures Ta (n) and the last indoor detected temperatures Ta (n-1) is 0.1-30 minute, the time interval of the high-frequency work that present embodiment four adopts is 3 minutes, and the time interval of other work is 9 minutes.Change schematic diagram for the fi (n) that adopts the different time interval shown in Fig. 7, abscissa is the time, ordinate is a target frequency, the time interval of embodiment four was 9 minutes when wherein P1 was common frequencies, P2 is that the following time interval of high frequency situations is 3 minutes, as shown in the figure, fi (n) begins to increase when second P1 finishes, and the value of increase is Δ fi (n-1); Further increase when next P1 finishes, the value of increase is Δ fi (n); Since at this moment fi (n) surpass the high frequency boundary of setting, so it is to detect in the time interval that the indoor temperature checkout gear begins according to P2, then through a P2 cycle, the value added of fi (n) is Δ fi (n+1), is thereafter Δ fi (n+2), Δ fi (n+3).Though, the gap length of P2 is shorter than P1, but because P1 is 3 times of P2, thus in the time of a P1 length, the increment of fi (n) be Δ fi (n+1)+Δ fi (n+2)+Δ fi's (n+3) and, though, because the time interval is short, the indoor temperature Δ T ' in this time interval changes and reduces, as shown in Fig. 2 to 4, Δ T ' reduces to make that fi (n) the increment Delta fi (n) in this time interval diminishes, but because the summation of three periodic increments may not necessarily be less than the increment in P1 cycle.But its advantage is exactly, can be more responsive feel variation of temperature trend, thereby make wiser and judge rapidly for the direction of further frequency change and amplitude.The time interval of the high-frequency work that the embodiment of the invention five adopts is 4 minutes, and the time interval of other work is 18 minutes.
As can be seen, the curve of room temperature difference in change Δ T '-frequency conversion increment Delta fi (n) is corresponding to fixing Δ T from Fig. 2 to Fig. 5, and its frequency conversion increment Delta fi (n) reduces along with the increase of Δ T '; The curve of described room temperature difference in change Δ T '-frequency conversion increment Delta fi (n) is along with the increase of corresponding temperature difference Δ T, and its position on ordinate raises.When the curve that it can also be seen that room temperature difference in change Δ T '-frequency conversion increment Delta fi (n) increased when the absolute value of Δ T ', the absolute value of the difference of the Δ fi (n) that the Δ fi (n) of this Δ T ' correspondence and Δ T '=0 are o'clock corresponding also increased.
More than load emergency case jumpy has appearred in the explanation interior space, such as: open the door, window etc., need there be bigger variation to deal with the rapid variation of interior space load to frequency, at this time the change curve from room temperature difference in change Δ T '-frequency conversion increment Delta fi (n) reflects: the absolute value of the value added of frequency conversion increment Delta fi (n) significantly increases, so that cold/thermic load can be eliminated very soon.In Fig. 2, the change direction of each temperature nodes of H2 is identical with H1; Compare the increase along with corresponding temperature difference Δ T with H1, its position on ordinate raises.
In addition relatively from cooling condition and heating condition, at the Δ T of the curve correspondence of room temperature difference in change Δ T '-frequency conversion increment Delta fi (n) is 0 and greater than 0 o'clock, Δ fi (n) is identical in the change direction of cooling condition and heating condition, and Δ fi (n) is close in the amplitude of the variation of cooling condition and heating condition.From Fig. 2 and Fig. 4 in the comparison of H1 curve and C1 curve just as can be seen.
When the Δ T of the curve correspondence of room temperature difference in change Δ T '-frequency conversion increment Delta fi (n) is less than 0 the time, Δ fi (n) curve of cooling condition is in the below of heating condition Δ fi (n) curve, and the absolute value of cooling condition Δ fi (n) is greater than the absolute value of heating condition Δ fi (n).As shown in Figure 8, C5 and H5 are respectively under the Δ T=-1.5 situation when cooling condition and heating condition, the curve of room temperature difference in change Δ T '-frequency conversion increment Delta fi (n), among the figure as can be seen, under same Δ T condition, during identical Δ T ' value, the frequency conversion increment Delta fi (n) of cooling condition C5 curve is below the frequency conversion increment Delta fi (n) of heating condition H5 curve, and the absolute value of cooling condition Δ fi (n) is greater than the absolute value of heating condition Δ fi (n).Be under the cooling condition, when the room colder the time, the user more needs to reduce as soon as possible the frequency of refrigeration, thereby reduces refrigerating capacity, reaches to satisfy the comfortable situation that the user sets; And under the heating condition, under the situation of room partial heat, the user reduces that to heat frequency so unobvious as refrigeration, can reduce the frequency that heats a little slowly, thereby reduce heating capacity, reaches and satisfies the comfortable situation that the user sets.Shown in Fig. 9, C6 and H6 are respectively under the Δ T=-2.5 situation when cooling condition and heating condition, the curve of room temperature difference in change Δ T '-frequency conversion increment Delta fi (n), among the figure as can be seen, under same Δ T condition, during identical Δ T ' value, the frequency conversion increment Delta fi (n) of cooling condition C6 curve below the frequency conversion increment Delta fi (n) of heating condition H6 curve, having illustrated that equally refrigeration needs the situation of more accelerating that reduces frequency.