CN100445658C - Air conditioner for accurately control temperature and humidity - Google Patents
Air conditioner for accurately control temperature and humidity Download PDFInfo
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- CN100445658C CN100445658C CNB2005101116379A CN200510111637A CN100445658C CN 100445658 C CN100445658 C CN 100445658C CN B2005101116379 A CNB2005101116379 A CN B2005101116379A CN 200510111637 A CN200510111637 A CN 200510111637A CN 100445658 C CN100445658 C CN 100445658C
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Abstract
An air conditioner able to precisely control temp and humidity for making the temp and humidity constant has a compressor for regulating the output of refrigerant, an expansion valve for regulating the flow of refrigerant flowing in evaporator, a condenser, an evaporator with multiple segments of heat exchanging surface controlled by electromagnetic valves, ambient temp and humidity sensors, a controller, and a refrigerating pipeline.
Description
Technical field
The present invention relates to a kind of air-conditioning of constant temperature and humidity, relate in particular to a kind of constant-temperature constant-humidity air-conditioner of energy accurately control temperature and humidity.
Background technology
Present known constant-temperature constant-humidity air-conditioner has refrigeration, heating, humidification and four kinds of basic functions of dehumidifying.Fig. 1 shows the operation principle of this air conditioner refrigerating.As shown in the figure, the refrigeration work parts of this air-conditioning mainly are connected in sequence by refrigerant tubing by compressor 11, condenser 12, expansion valve 13 and evaporimeter 14.
From operation of air conditioner, when room temperature was higher than the temperature that air-conditioning sets, air-conditioning was enabled compressor 11 output of freezing; When room temperature drops to when satisfying the air-conditioning design temperature, compressor 11 is out of service.But, because the heat load in controlled place can produce than big-difference with seasonal variations, and at the design initial stage all is to carry out the air-conditioning configuration according to the targeted environment maximum heating load, so compressor is understood frequent starting, and then influences the service life and the temperature control precision of compressor 11.Present temperature control accuracy can reach ± and 1 ℃.
From the dehumidifying operation, when ambient humidity was higher than the air-conditioning setting value, starting of air conditioner compressor 11 carried out dehumidification operation, and air humidity descends gradually, required back compressor 11 out of service up to the setting of satisfying air-conditioning.When adopting this mode to carry out dehumidification operation, although most refrigerating capacitys is used to the moisture in the condensation air, also inevasible meeting impacts environment temperature.So in a single day temperature drops to outside the allowed band in the dehumidification operation, air-conditioning can start electric heater, and the heat that loses because of dehumidifying with compensation keeps the environment temperature constant.The shortcoming of this method of operation is that compressor and heater generation repeat power consumption, brings bigger energy consumption.If when the thermal loss that the dehumidifying operation brings was not still satisfied in opening electric heater compensation in dehumidification process in addition, air-conditioning can be selected preferentially to control temperature, and then stop compressor and abandon dehumidification operation, treat that restarting compressor again after temperature is recovered dehumidifies.Therefore cause a bottleneck on the humidity control accuracy.Present control model humidity control accuracy can reach ± 5%RH.
So as a whole, the weak point of current constant-temperature constant-humidity air-conditioner has following 3 points: 1, compressor life-span hidden danger in the refrigerating operaton; 2, improve the bottleneck that runs on the temperature and humidity control accuracy; 3, the dehumidifying high energy consumption that repeats to consume energy and bring in service.
Summary of the invention
The objective of the invention is to address the above problem, a kind of new constant-temperature constant-humidity air-conditioner is provided, can not only breakthrough bottleneck, improve the control accuracy of temperature and humidity, and can extremely effectively reduce and repeat power consumption, can also the prolongation in compressor service life be played a positive role.
Technical scheme of the present invention is: a kind of constant-temperature constant-humidity air-conditioner of accurately control temperature and humidity, comprise compressor, condenser, expansion valve, evaporimeter, described compressor, condenser, expansion valve and evaporimeter connect into a loop by refrigeration piping, the cold-producing medium ringing is arranged in described loop, wherein, described compressor is for becoming the compressor of refrigerating capacity output, described air-conditioning also comprises sensor and control module, described sensor is used to gather the ambient temperature and humidity state, described control module connects described sensor and compressor, be used to receive the cold-producing medium output quantity that described ambient temperature and humidity state is adjusted described compressor, described evaporimeter is a fabricated structure, the multistage heat-transfer surface is arranged in its inside, the one end merging of described multistage heat-transfer surface is connected on the described compressor, the other end is connected on the described expansion valve by a refrigeration piping respectively, on each refrigeration piping, also be respectively equipped with the control magnetic valve, described control magnetic valve is connected with described control module, be used to control the duty of described each heat-transfer surface of evaporimeter, described expansion valve is an electric expansion valve, inside is provided with one and regulates the parts of cold-producing medium output quantity, described electric expansion valve links to each other with evaporator tube pipeline joint on the described compressor by holding wire, an end that links to each other with compressor on the described holding wire is provided with a microsensor, be used for gathering evaporimeter and compressor connecting pipe refrigerant condition and give described electric expansion valve with described feedback of status; In service in dehumidifying, influenced by dehumidification operation and under the situation about descending in environment temperature, the compressor that this control module is controlled this change refrigerating capacity output reduces the cold-producing medium output quantity, control effective heat-transfer surface that described control magnetic valve reduces this evaporimeter simultaneously, so that this air-conditioning reduces the influence to environment temperature when remaining under the big enthalpy difference operating mode.
In the above-mentioned constant-temperature constant-humidity air-conditioner, described control module comprises control logic unit and compiling of instruction performance element, described control logic unit receives described ambient temperature and humidity state and sets value according to described these states and humiture user systematic parameter and operating instruction are set, described compiling of instruction performance element connects described control logic unit, is used for receiving and carrying out the instruction of described control logic unit.
In the above-mentioned constant-temperature constant-humidity air-conditioner, described sensor is temperature sensor and/or humidity sensor.
In the above-mentioned constant-temperature constant-humidity air-conditioner, described compressor is a multiple compressors in parallel.
Beneficial effect of the present invention is: adopt variable conpacitance compressor with the continuous control of proportional integral formula in refrigeration system, reduced the frequent starting of compressor.Air-conditioning can be adjusted the workload of cold-producing medium immediately according to the humiture state of environment, and the duty that a plurality of heat-transfer surfaces also pass through these heat-transfer surfaces of control solenoid control is arranged in evaporimeter inside, thereby has improved the accuracy of system environment temperature and humidity control.The general refrigeration ability of reduction system immediately output as required in dehumidifying work, thus the influence of dehumidifying work reduced for environment temperature, make air-conditioning more energy-conservation.
Description of drawings
Fig. 1 is the theory diagram of the common constant-temperature constant-humidity air-conditioner of prior art.
Fig. 2 is the theory diagram of a preferred embodiment of the present invention.
The specific embodiment
The invention will be further described below in conjunction with drawings and Examples.
Fig. 2 shows the inside theory structure of a preferred embodiment of the present invention.As shown in Figure 2, this constant-temperature constant-humidity air-conditioner mainly is made up of control device and cold-producing medium equipment two parts.In the control device, sensor 204, control logic unit 203 and compiling of instruction performance element 202 are connected by electronic circuit 212.Sensor 204 generally is temperature sensor or humidity sensor or both combinations, is used to gather the humiture state of indoor environment.Control logic unit 203 is chip pieces, and chip has been embedded in one section program, can set each parameter of air-conditioning system work according to the humiture of sensor 204 detected ambient temperature and humidities and default, and the generating run instruction.Parameter and instruction that compiling of instruction performance element 202 receives from control logic unit 203, the output refrigeration work consumption of adjusting compressor.In the cold-producing medium equipment, compressor 201, condenser 208, expansion valve 207 and evaporimeter 206 are linked to be a loop by refrigeration piping 210, and compressor power 205 and instructions compiling performance element 202 connects by cable 211.Compressor 201 is compressor bank of varying capacity, can be that the parallel connection of multiple compressors realizes, also can be that common compressor adds a converter plant, and the flow of its output cold-producing medium can be regulated; Expansion valve 207 is electric expansion valves, can also regulate the output of refrigerant flow except the function with general expansion valve throttling step-down, and control enters the refrigerant amount of evaporimeter 206.Be provided with a signal line 213 on electric expansion valve 207 and the compressor 201 with between the refrigeration piping interface that evaporimeter 206 is connected.An end that links to each other with compressor 201 at holding wire 213 is provided with a microsensor (not shown), this microsensor is gathered the refrigerant condition in this segment pipe, and these parameters are passed to electric expansion valve 207 by holding wire 213, electric expansion valve 207 is regulated the refrigerant flow that outputs in the evaporimeter 206 according to these state parameters.Unlike the prior art be, compressor 201 output capacities are adjustable, and the multistage heat-transfer surface is arranged in evaporimeter 206 inside, is four sections of 206A, 206B, 206C and 206D in the present embodiment, is defined as 4 sections here just for convenience of description but be not limited to this; Connect one section refrigeration piping 210 separately between these four sections heat-transfer surfaces and the electric expansion valve 207, and control magnetic valve 209A, 209B, 209C and 209D have been installed on pipeline, these magnetic valves are connected with control logic unit 203 by cable 211 respectively, by control logic unit 203 its foldings of control, so control each flash-pot heat-transfer surface whether effectively.
Introduce operation principle of the present invention below.Because air-conditioning system is worked under the condition that environment temperature, indoor load constantly change, and between each parts of system, influence each other between system environments and the environment, so the state of air-conditioning system always in continuous variation, need come the fan-out capability of timely adjustment air-conditioning system by control device.The present invention is an a kind of soft readjustment system, gather the state parameter of indoor environment comfortableness parameter, outdoor environment parameter and sign refrigeration system operation conditions by control system, set criterion according to running Optimization criterion and user, control inner circulating mass of refrigerant by adopting variable conpacitance compressor group 201, adopt electric expansion valve 207 to regulate the refrigerant flow that enters evaporimeter 206, adopt simultaneously the switch of control magnetic valve 209A-209D control each evaporimeter heat-transfer surface 206A-206D whether effectively, in time satisfy indoor cooling and heating load requirement.
Aspect temperature control, sensor 204 detects indoor environment, obtains the humiture state, and these states are passed to control logic unit 203.The humiture index that control logic unit 203 is set according to the real-time humiture state homologous ray that obtains compares and computing, determine the operational factor of air-conditioning, the operating instruction of air-conditioning is set, after confirming the functional unit fault-free, sends operating instruction to hardware system.When indoor environment temperature surpasses default value, integration principle proportionally, variable conpacitance compressor groups 201 are controlled with output at full capacity by compiling of instruction performance element 202 in control logic unit 203, and control electric expansion valve 207 is operated at full capacity, and opens all control magnetic valve 209A-209D and makes all heat-transfer surfaces in the evaporimeter 206 all effective.The air quantity of matching design and exchange capability of heat are operated under the little enthalpy difference operating mode of full ratio, to reduce indoor environment temperature as early as possible the refrigeration system of air-conditioning.Along with the decline of environment temperature, the homologous ray setting value moves closer to, and sensor 204 is gathered the humiture of prevailing circumstances in real time, and control logic unit 203 is also adjusted the operational factor and the instruction of air-conditioning in real time.Compiling of instruction performance element 202 is adjusted variable conpacitance compressor group 201 output capacities, reduces the workload of cold-producing medium.Meanwhile, control logic unit 203 control electric expansion valves 207 reduce the refrigerant flow of inflow evaporator 206, and also closed portion control magnetic valve 209 reduces the part effective heat exchange face of evaporimeter 206.Thermic load real-time regulating system refrigerating capacity according to indoor environment makes both reach poised state, and this balance point temperature index is infinitely close to the desired temperature of system.It is relatively stable that indoor environment temperature is controlled in equalization point, can not produce acutely and stir.To sum up, because system can adjust the cold-producing medium workload as required at any time, so air-conditioning obtains to improve to the temperature controlling accuracy.Variable conpacitance compressor group 201 keeps operating under the power output of equalization point correspondence always, evaporimeter 206 has also kept the effective area under the poised state simultaneously, the high frequent start-stop problem of bringing because of the raising control accuracy in the prior art has been avoided in both combinations, and the compressor life-span also obtains prolonging relatively.
It is similar heating operation principle and process of refrigerastion: the refrigerant gas of low-temp low-pressure is sucked the refrigerant gas of back pressurization becoming HTHP by compressor 201, the liquid of the refrigerant gas of HTHP warm high pressure during heat release becomes in indoor heat exchanger, room air is heated through heat exchanger surface simultaneously, reaches the purpose that indoor temperature is raise.In the liquid of warm high pressure again through becoming the liquid of low-temp low-pressure after the throttle part throttling step-down, the liquid of low-temp low-pressure absorb heat in heat exchanger and becomes the gas of low-temp low-pressure after the evaporation, outdoor air passes through the heat exchanger surface cooling that is cooled simultaneously.The gas of last low-temp low-pressure is sucked by compressor once more, so circulation.And principle of the present invention is also similar with process of refrigerastion in the process of heating, and is not described in detail at this.
Aspect humidity control, when indoor environment humidity surpasses system's humidity set point, integration principle proportionally, control logic unit 203 initialization system operational factors, such as air quantity and exchange capability of heat etc., and system's operating instruction is set, make refrigeration system be operated under the big enthalpy difference operating mode of full ratio output the airborne moisture of the easier removal of system under this operating mode.Along with the decline of ambient humidity and dwindling of homologous ray humidity set point gap, control logic unit 203 progressively reduces system's general refrigeration ability output, control the part effective heat exchange face that magnetic valve 209 gradually reduces evaporimeter 206 simultaneously, keeping under the big enthalpy difference working condition in the hope of accurate controlled humidity, finally infinitely near the wetting balance point.In service in dehumidifying, if environment temperature is influenced by dehumidification operation and descends, system needn't take to heat with electric heater the measure of the heat of covering the loss, control logic unit 203 can control system reduce the general refrigeration ability of exporting, control the part effective heat exchange face that magnetic valve 209 reduces evaporimeter 206 simultaneously, when making system remain under the big enthalpy difference operating mode, reduce influence to environment temperature as far as possible.
Now illustrate the advantage of the constant-temperature constant-humidity air-conditioner contrast prior art that adopts the technology of the present invention.Suppose that the thermic load of indoor environment was 1720Kcal/h at that time, be calculated as 1720/860=2KW by the mechanical equivalent of heat; The air-conditioning general refrigeration ability is 10KW, and the design sensible heat ratio is 0.4 under the big enthalpy difference operating mode of air-conditioning, and the miscellaneous part parameter is by identical configuration.
The apparent cold that discharges when carrying out dehumidification operation according to the air-conditioning of prior art control scheme is: 10 * 0.4=4KW.Deduct the neutralization of indoor thermal source, the last air-conditioning also apparent cold of surplus 4-2=2KW is applied in reducing temperature, is the fluctuation of equilibrium temperature, and the thermal loss of the necessary opening electric heater compensation of air-conditioning 2KW keeps the constant of temperature.This moment, the power consumption of air-conditioning was: 2KW (electric heater)+10/3 (the compressor Energy Efficiency Ratio is calculated by 3)＞5KW.
Control the air-conditioning of conceptual design according to the present invention, suppose system in the dehumidifying poised state that enters in service, the general refrigeration ability export ratio of refrigeration system this moment is 50%.The apparent cold that discharges when carrying out dehumidification operation is: 10 * 50% * 0.4=2KW.Deduct the neutralization of indoor thermal source and offset, the apparent cold that whole air conditioner dehumidification operation discharges is: 2-2=0KW.That is to say dehumidifies with this state has no effect to room temperature, also just need not opening electric heater and carries out heat compensation.This moment, the power consumption of air-conditioning was: 10/3 * 50%＜2KW.
The foregoing description provides to those of ordinary skill in the art and realizes or use of the present invention; those of ordinary skill in the art can be under the situation that does not break away from invention thought of the present invention; the foregoing description is made various modifications or variation; thereby protection scope of the present invention do not limit by the foregoing description, and should be the maximum magnitude that meets the inventive features that claims mention.
Claims (4)
- The constant-temperature constant-humidity air-conditioner of 1 one kinds of accurately control temperature and humidities, comprise compressor, condenser, expansion valve, evaporimeter, described compressor, described condenser, described expansion valve and described evaporimeter connect into a loop by refrigeration piping, the cold-producing medium ringing is arranged in described loop, it is characterized in that, described compressor is for becoming the compressor of refrigerating capacity output, described air-conditioning also comprises sensor and control module, described sensor is used to gather the ambient temperature and humidity state, described control module connects described sensor and described compressor, be used to receive the cold-producing medium output quantity that described ambient temperature and humidity state is adjusted described compressor, described evaporimeter is a fabricated structure, the multistage heat-transfer surface is arranged in its inside, the one end merging of described multistage heat-transfer surface is connected on the described compressor, the other end is connected on the described expansion valve by a refrigeration piping respectively, on each refrigeration piping, also be respectively equipped with the control magnetic valve, described control magnetic valve is connected with described control module, be used to control the duty of described each heat-transfer surface of evaporimeter, described expansion valve is an electric expansion valve, its inside is provided with one and regulates the parts of cold-producing medium output quantity, described electric expansion valve links to each other with evaporator tube pipeline joint on the described compressor by holding wire, an end that links to each other with described compressor on the described holding wire is provided with a microsensor, be used for gathering described evaporimeter and described compressor connecting pipe refrigerant condition and described refrigerant condition fed back to described electric expansion valve; In service in dehumidifying, influenced by dehumidification operation and under the situation about descending in environment temperature, the compressor that this control module is controlled this change refrigerating capacity output reduces the cold-producing medium output quantity, control effective heat-transfer surface that described control magnetic valve reduces this evaporimeter simultaneously, so that this air-conditioning reduces the influence to environment temperature when remaining under the big enthalpy difference operating mode.
- 2 constant-temperature constant-humidity air-conditioners according to claim 1, it is characterized in that, described control module comprises control logic unit and compiling of instruction performance element, described control logic unit receives described ambient temperature and humidity state and sets value according to described ambient temperature and humidity state and humiture user systematic parameter and operating instruction are set, described compiling of instruction performance element connects described control logic unit, is used for receiving and carrying out the instruction of described control logic unit.
- 3 constant-temperature constant-humidity air-conditioners according to claim 1 and 2, described sensor are temperature sensor and/or humidity sensor.
- 4 constant-temperature constant-humidity air-conditioners according to claim 1 and 2, described compressor are multiple compressors in parallel.
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| CNB2005101116379A CN100445658C (en) | 2005-12-19 | 2005-12-19 | Air conditioner for accurately control temperature and humidity |
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| CNB2005101116379A CN100445658C (en) | 2005-12-19 | 2005-12-19 | Air conditioner for accurately control temperature and humidity |
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| CN100445658C true CN100445658C (en) | 2008-12-24 |
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| CN110513836A (en) * | 2019-08-14 | 2019-11-29 | 海信（广东）空调有限公司 | The control method of refrigeration system, the refrigeration system of air-conditioning and air-conditioning |
| CN110513783A (en) * | 2019-08-22 | 2019-11-29 | 海信（广东）空调有限公司 | A kind of air conditioner dehumidification system and its control method |
| CN114963442A (en) * | 2022-04-24 | 2022-08-30 | 青岛海尔空调器有限总公司 | Air conditioner and control method thereof |
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