CN1924472A

CN1924472A - Method for improving air conditioner refrigeration efficiency and control device thereof

Info

Publication number: CN1924472A
Application number: CN 200610086836
Authority: CN
Inventors: 樊远征
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-06-20
Filing date: 2006-06-20
Publication date: 2007-03-07

Abstract

This invention provides one cooling control mode to improve cooling effect, which adopts cooling system with A and B compressors and cooling device for continuous cooling through invention, wherein, the B machine is controlled by cooling control mode to improve condensator dissipation utility more than 30 percentage and to lower condensator temperature more than 4 degrees to realize cooling effect comparing with air conditioning effect improved by 30 to 40 percentage and to reduce start times by 50 percentage to save relative start consumption.

Description

Improve the method and the control device thereof of air conditioner refrigeration efficiency

Technical field

The present invention relates to a kind of method and control device thereof that improves air conditioner refrigeration efficiency, specifically by changing a kind of method and the corresponding controller thereof that the refrigeration control model improves refrigeration efficiency.

Technical background

The tradition air conditioner adopts switch compressor or frequency-changeable compressor to regulate refrigerating capacity coupling refrigeration duty, make the condenser heat dissipation capacity or the time low when high, the utilization rate of condenser has been lowered in or the fluctuation that cuts in and out thus, the condensation mean temperature that raise causes refrigeration efficiency lower.Such as:

The refrigeration work consumption curve of the switch compressor that Fig. 1 (a) describes, the condenser that left unused when compressor shutdown has reduced the utilization rate of condenser; And condenser has been born maximum refrigeration work consumption when compressor is started shooting, and condenser heat can not get in time loosing removing, and condensation temperature sharply rises.The result that condensation temperature rises causes refrigerating capacity to descend, and compression ratio increases, and the compressor electric motor electric current increases, and finally makes refrigeration efficiency than reducing.

The frequency-changeable compressor refrigeration work consumption curve that Fig. 1 (b) describes, when compressor cooling power was lower than refrigeration work consumption mean value, the utilization rate of condenser descended; When compressor cooling power was higher than refrigeration work consumption mean value, condenser heat can not get timely diffusing removing and condensation temperature is risen, and finally also makes refrigeration efficiency than reduction.

Summary of the invention

The purpose of this invention is to provide a kind of method and corresponding device thereof thereof that improves the refrigeration control model of refrigeration efficiency.

This method is to realize by the refrigeration system and the control device that contain A, two compressors of B, as outdoor temperature t _W〉=to fixed temperature G _NThe time, air conditioner adopts the refrigeration control model of " transferring at system, intermittence continuously ", i.e. A continuous cooling, and B refrigeration at controlled intermittence.

As outdoor temperature t _W＜to fixed temperature G _nThe time, air conditioner adopts the refrigeration control model of " intermittently transferring ", promptly have only B refrigeration at controlled intermittence, and A does not participate in refrigeration.

Two refrigeration compressors of the said A of the present invention, B, the selection of its best are that A is the constant speed compressor of low capacity, and B is big capacities of fixed-speed compressor, or frequency-changeable compressor, or the DC speed regulation compressor.

Realize that control device of the present invention is shown in Fig. 2,3,4, it mainly is made up of one-chip computer (5), temperature sensor (6), (7) and relay (3), (4), (9), this control device can be divided into two parts, be respectively " relatively switch ", " room temperature controller ", they mainly be constructed as follows:

Outdoor temperature sensor (7) connects and composes " relatively switch " with an input of one-chip computer (5); Indoor temperature transmitter (6) is connected with an input of one-chip computer (5), and the output of one-chip computer (5) is connected with relay (3), (4), (9) respectively, constitutes " room temperature controller ".

Description of drawings

Fig. 1. general air conditioner refrigeration power curve principle schematic;

Fig. 2. use air conditioner schematic diagram of the present invention;

Fig. 3. the circuit diagram among the embodiment 1;

Fig. 4. the circuit diagram among the embodiment 2;

Fig. 5. the main program block diagram of control device of the present invention;

Fig. 6. the flow chart of switch temperature controller control B;

Fig. 7. the flow chart of fuzzy Control B;

The specific embodiment

The operation condition of " relatively switch " of the present invention is outdoor temperature t _W〉=to fixed temperature G _N, " relatively switch " just connects A and carries out continuous cooling when satisfying this condition, referring to Fig. 2.

If when B machine of the present invention adopted constant speed compressor, " room temperature controller " among Fig. 2 was the switch temperature controller, the control program block diagram is referring to Fig. 6; If when adopting frequency-changeable compressor or adopting the DC speed regulation compressor, " room temperature controller " among Fig. 2 is the fuzzy control temperature controller, the control program block diagram is referring to Fig. 7.

Embodiment 1

Here be example with existing market normal domestic use air conditioner, refrigeration compressor in this air conditioner is as the said B machine of the present invention, and select power only to be the constant speed compressor A machine of B machine 1/5 again, under the control of control device of the present invention, constitute the new air conditioners of " transferring at system, intermittence continuously ", referring to Fig. 3, its ruuning situation is as follows:

After air conditioner powered on, one-chip computer (5) carried out initialization earlier by Fig. 5 main program, then, handled and gave fixed temperature G _NAs G _N=25 ℃, and handle the indoor temperature t that changes through AD _NWith outdoor temperature t _WData; Then, compare outdoor temperature t _WWith give fixed temperature G _NTo determine A machine duty, work as t _W＜G _NThe time A machine shut down, work as t _W〉=G _NThe time A machine start continuous cooling; At last, carry out room temperature control computing and operate B machine refrigeration at controlled intermittence with the coupling refrigeration duty, the room temperature controller of this example adopts the switch temperature controller, and its flow chart is worked as t as shown in Figure 6 _N＜(G _N-the B machine is shut down δ) time, works as t _N＞(G _N+ B machine start refrigeration δ) time.Wherein δ is to fixed temperature G _NError band, switching frequency and the decision of indoor accuracy of temperature control that its numerical value is allowed by the axial-flow fan motor, general δ value in 0 ℃ of-1 ℃ of scope.

Embodiment 2

Here be example with existing market frequency conversion domestic air conditioner, refrigeration compressor in this air conditioner is as the said B machine in the past of the present invention, and select power only to be the constant speed compressor A machine of B machine 1/5 again, under control of the present invention, also constitute the new air conditioners of " transferring at system, intermittence continuously ", referring to Fig. 4, its ruuning situation is as follows:

After air conditioner powered on, one-chip computer (5) carried out initialization earlier by Fig. 5 main program, then, handled and gave fixed temperature G _NAs G _N=25 ℃, and handle the indoor temperature t that changes through AD _NWith outdoor temperature t _WData; Then, compare outdoor temperature t _WWith give fixed temperature G _NTo determine A machine duty, work as t _W＜G _NThe time A machine shut down, work as t _W〉=G _NThe time A machine start refrigeration; At last, carry out room temperature control computing and operate B machine refrigeration adjustment at controlled intermittence refrigerating capacity, the room temperature controller of this example adopts the fuzzy control temperature controller, its flow chart as shown in Figure 7, the refrigerating operaton state of the output voltage signal operation B machine after the computing.

The present invention has following advantage:

1. refrigeration control pattern provided by the invention has realized raising condenser heat radiation utilization rate 30% or more and reduction condensation temperature The effect of degree more than 4 ℃. Refrigeration industry the colleague know, reduces condensation temperature and not only increased refrigerating capacity, but also reduce Compressor electric motor power makes refrigeration efficiency increase substantially thus. Use the refrigeration efficiency ratio of air conditioner of the present invention Improve 30%-40% than common air-conditioning mechanism cold Energy Efficiency Ratio.

2.A the machine continuous cooling can reduce the number of starts of B machine 50%, thereby has saved the startup energy consumption of B machine.

3. the present invention improves the invention effect of condenser heat radiation utilization rate more than 30%, can also be by reducing 10-20%'s The radiator area realization benefit that reduces cost.

Claims

1. method that improves air conditioner refrigeration efficiency, this method realizes by the refrigeration system and the working procedure control device that contain A, two compressors of B, it is characterized in that:

1) at outdoor temperature t _W〉=to fixed temperature G _NUnder the situation, the A machine starts and continuous cooling, has only as indoor temperature t _N＞(G _n+ δ) time, the B machine just starts refrigeration, works as t _N＜(G _n-δ) time, the B machine is just shut down.

2) at outdoor temperature t _W＜to fixed temperature G _NUnder the situation, the A machine is shut down, as indoor temperature t _N＞(G _n+ δ) time, the B machine starts refrigeration, works as t _N＜(G _n-δ) time, the B machine is also shut down.

2. an enforcement power requires the control device of 1 described method, it mainly is made up of one-chip computer (5), temperature sensor (6), (7) and relay (3), (4), (9), this control device can be divided into two parts, be respectively " relatively switch " and " room temperature controller ", they mainly be constructed as follows: outdoor temperature sensor (7) connects and composes " comparison switch " with an input of one-chip computer (5); Indoor temperature transmitter (6) is connected with an input of one-chip computer (5), and the output of one-chip computer (5) is connected with relay (3), (4), (9) respectively, constitutes " room temperature controller ".