CN105526681A - Dehumidification controlling method and system of low-load refrigeration and dehumidification air conditioner and air conditioner - Google Patents
Dehumidification controlling method and system of low-load refrigeration and dehumidification air conditioner and air conditioner Download PDFInfo
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- CN105526681A CN105526681A CN201610054297.9A CN201610054297A CN105526681A CN 105526681 A CN105526681 A CN 105526681A CN 201610054297 A CN201610054297 A CN 201610054297A CN 105526681 A CN105526681 A CN 105526681A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/20—Humidity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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Abstract
The invention discloses a dehumidification controlling method and system of a low-load refrigeration and dehumidification air conditioner and the air conditioner. The method comprises the steps that the refrigeration or dehumidification function in a cabinet is started selectively according to the humidity of return air in the cabinet; when the thermal load of the cabinet is smaller than the cooling capacity output by a compressor at low frequency, the humidity of return air in the cabinet is greater than the humidity threshold value and dehumidification is required, frequency decreasing adjustment is conducted on the compressor, and a solenoid valve is controlled to close part of evaporator coil pipes; when the thermal load of the cabinet is not smaller than the cooling capacity output by the compressor at low frequency, the humidity of return air in the cabinet is not greater than the humidity threshold value and dehumidification is required, frequency increasing or frequency decreasing adjustment is conducted on the compressor properly; and when the temperature inside the cabinet reaches the dehumidification low temperature threshold value in the dehumidification process, a controllable positive temperature coefficient (PTC) heater is started to heat the cabinet so as to stabilize the temperature inside the cabinet. By combination of a compressor capacity-controllable modulation technology and a dehumidification technology for part of the coil pipes, the structural design is simple and reliable, a few action parts exist, and the temperature inside the cabinet is controlled to be stable.
Description
Technical field
The present invention relates to data center's field of air conditioning, in particular a kind of dehumidification control method of underload refrigerated dehumidification air-conditioning, system and air-conditioning.
Background technology
Understand tacitly in the data in territory, the server normal operation of environment temperature, relative humidity and data center is closely bound up.IT kind equipment is made up of numerous chip, components and parts, and temperature factor has become the most important factor affecting electronic component failure, and for some circuit, reliability almost depends on thermal environment completely; And when the relative humidity of air is greater than 65%, surface attachment a layer thickness of object is the moisture film of 0.001 ~ 0.01 micron, when relative humidity humidity is 100%, the thickness of moisture film is 10 microns.Such moisture film easily causes " conduction path " or arcing, the serious reliability reducing circuit.
Therefore, for information technoloy equipment and the server of data center, the precise hard_drawn tuhes function whether precision air conditioner possesses temperature and humidity is significant for the normal use of data center products.So in traditional data center machine room, in order to avoid humidity is too high, usually can adopt and fall air quantity dehumidifying; In special application fields such as laboratory air-conditioning or wine cellar air-conditionings, extra high to humidity required precision, the scheme of part coil pipe dehumidifying can be enabled.And for the application scenario of rack data center and modular data center, mainly contain at present and fall the method such as air quantity and heating compensation and dehumidify, but all there is certain shortcoming:
Fall air quantity dehumidifying: when rack IT server load is less, when opening dehumidifying, compressor is still in refrigeration, after air quantity reduces, leaving air temp is lower, and what cold channel temperature can be caused to fall is very fast, high frequent start-stop, effect on moisture extraction is not good, and condensation problem can be caused to occur.
Dehumidifying heating compensation: open heating, increases the compressor opening time, extends the dehumidifying time, but the shortcoming existed causes energy waste, by consuming electrically heated energy, offset part cold, reach and be lifted out air temperature, extend the compressor opening time, namely dehumidify time lengthening.
Underloading desiccant cooling: adopt double evaporators, consumption Partial shrinkage machine wasted work, offset part refrigerating capacity, but the shortcoming existed is design and installation complexity, takies U bit space large, causes client's rack that U position can be used few; The shortcomings such as control device is many, and control system is complicated, and failure risk is high, and later maintenance cost is high.
Therefore, prior art has yet to be improved and developed.
Summary of the invention
In view of above-mentioned the deficiencies in the prior art, the object of the present invention is to provide a kind of dehumidification control method of underload refrigerated dehumidification air-conditioning, system and air-conditioning, combined with part coil pipe dehumidifying technology by contracting machine varying capacity regulation technology, Temperature and Humidity Control is stablized, and structural design is simple and reliable.
Technical scheme of the present invention is as follows:
A dehumidification control method for underload refrigerated dehumidification air-conditioning, comprises the following steps:
A, select the function of opening refrigeration or dehumidifying in rack according to the humidity of return air in rack; ;
B, when rack heat load be less than cold that compressor low frequency exports and in rack the humidity of return air be greater than humidity threshold values have a dehumidification time, carry out frequency reducing to compressor to regulate and Controlling solenoid valve closed portion evaporator coil, when rack heat load be not less than cold that compressor low frequency exports and in rack the humidity of return air be not more than humidity threshold values have a dehumidification time, adapt to carry out raising frequency to compressor or frequency reducing regulates;
C, when in-cabinet temperature in dehumidification process reach dehumidifying low temperature threshold values time, opening controlled ptc heater is that cabinet-heating is in order to stabilizing machine in-cabinet temperature.
In the dehumidification control method of above-mentioned underload refrigerated dehumidification air-conditioning, before described steps A, also comprise step S:
The humidity threshold values contrasted with return air humidity parameter in rack is set, and the dehumidifying low temperature threshold values for judging whether to open ptc heater is set.
In the dehumidification control method of above-mentioned underload refrigerated dehumidification air-conditioning, described step B specifically comprises:
Cold is exported when rack heat load is less than contracting machine low-limit frequency, and when in rack, the humidity of return air is higher than humidity threshold values, regulate compressor to be downconverted to minimum cold to export and opens solenoid valve closed portion evaporator coil, the return air stream making the evaporator coil flowing through closedown and the low-temperature airflow flowing through evaporator coil are mixed for the interior temperature and the humidity that control rack;
When rack heat load be not less than cold that compressor low frequency exports and in rack the humidity of return air be not more than humidity threshold values have a dehumidification time, adapt to carry out raising frequency to compressor or frequency reducing regulates.
In the dehumidification control method of above-mentioned underload refrigerated dehumidification air-conditioning, described step C specifically also comprises:
Export cold when rack heat load is less than compressor low-limit frequency, when the temperature in dehumidification process in rack reaches dehumidifying low temperature threshold values threshold values, open the temperature in controllable silicon ptc heater, control ptc heater electrodeless regulation output heat maintenance rack.
A dehumidification control system for underload refrigerated dehumidification air-conditioning, comprising:
Contrast judge module, for selecting the function of opening refrigeration or dehumidifying in rack according to the humidity of return air in rack; ;
Adjustment module, for be less than cold that compressor low frequency exports when rack heat load and in rack the humidity of return air be greater than humidity threshold values have a dehumidification time, carry out frequency reducing to compressor to regulate and Controlling solenoid valve closed portion evaporator coil, when rack heat load be not less than cold that compressor low frequency exports and in rack the humidity of return air be not more than humidity threshold values have a dehumidification time, adapt to carry out raising frequency to compressor or frequency reducing regulates;
Heating module, during for reaching dehumidifying low temperature threshold values when in-cabinet temperature in dehumidification process, opening controlled ptc heater is that cabinet-heating is in order to stabilizing machine in-cabinet temperature.
In the dehumidification control system of above-mentioned underload refrigerated dehumidification air-conditioning, also comprise and pre-set module, it is for arranging the humidity threshold values contrasted with return air humidity parameter in rack, and arranges the dehumidifying low temperature threshold values for judging whether to open ptc heater.
In the dehumidification control system of above-mentioned underload refrigerated dehumidification air-conditioning, described adjustment module comprises:
First regulon, cold is exported for being less than contracting machine low-limit frequency when rack heat load, and when in rack, the humidity of return air is higher than humidity threshold values, regulate compressor to be downconverted to minimum cold to export and opens solenoid valve closed portion evaporator coil, the return air stream making the evaporator coil flowing through closedown and the low-temperature airflow flowing through evaporator coil are mixed for the interior temperature and the humidity that control rack;
Second adjustment module, for be not less than cold that compressor low frequency exports when rack heat load and in rack the humidity of return air be not more than humidity threshold values have a dehumidification time, adapt to carry out raising frequency to compressor or frequency reducing regulates.
In the dehumidification control system of above-mentioned underload refrigerated dehumidification air-conditioning, described heating module, also export cold for being less than compressor low-limit frequency when rack heat load, when temperature in dehumidification process in rack reaches dehumidifying low temperature threshold values, open the temperature in controllable silicon ptc heater, control PCT heater electrodeless regulation output heat maintenance rack.
The present invention also provides a kind of underload refrigerated dehumidification air-conditioning, comprises the dehumidification control system of the underload refrigerated dehumidification air-conditioning of above-mentioned any one.
The dehumidification control method of a kind of underload refrigerated dehumidification air-conditioning provided by the present invention, system and air-conditioning, by the combination of compressor variable capacity regulating technology and part coil pipe dehumidifying technology, structural design is simple and reliable, and action component is few, and dehumidification rate is high; In rack data center, load is low, when envionmental humidity is high, carry out Intelligent dehumidifying, in conjunction with compressor variable frequency function, control temperature and moisture stable are in range of set value, and in rack, stable temperature control ensures cabinet-type data center and the long-term reliability service of modular data center product.
Accompanying drawing explanation
Fig. 1 is the flow chart of the dehumidification control method of middle-low load refrigerated dehumidification air-conditioning of the present invention;
Fig. 2 is the module frame chart of the dehumidification control system of middle-low load refrigerated dehumidification air-conditioning of the present invention;
Fig. 3 is the stream schematic diagram of middle-low load refrigerated dehumidification air-conditioning of the present invention;
Fig. 4 is the schematic internal view of middle-low load refrigerated dehumidification air-conditioning of the present invention.
Detailed description of the invention
The invention provides a kind of dehumidification control method of underload refrigerated dehumidification air-conditioning, system and air-conditioning, for making object of the present invention, technical scheme and effect clearly, clearly, referring to accompanying drawing examples, the present invention is described in more detail.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Refer to Fig. 1, and shown in composition graphs 3 and Fig. 4, air-conditioning of the present invention is that rack precision air conditioner is made up of parts such as compressor 1, condenser 2, restricting element 3, magnetic valve 4, evaporimeter 5, refrigeration pipe 6, indoor fan 7, ptc heaters 8.
The dehumidification control method of underload refrigerated dehumidification air-conditioning provided by the invention, its step comprises:
S100, select the function of opening refrigeration or dehumidifying in rack according to the humidity of return air in rack; .
The controller of rack precision air conditioner, when normally running, can continue through temperature and relative humidity that return air humiture probe detects return air in rack; Contrast the cold that the heat load of rack data center and compressor 1 low frequency export simultaneously.Now according to the humiture of return air in rack, the controller of rack precision air conditioner can judge that temperature prioritised or humidity is preferential, thus judges that system is opened and freeze or dehumidification function.Such as, rack load is greater than the output of compressor 1 low frequency cold, without dehumidification; Rack load is mated with compressor 1 low frequency cold, without dehumidification: rack load is less than compressor 1 low-limit frequency cold coupling, without dehumidification: rack load is greater than compressor 1 low-limit frequency cold and exports, there is dehumidification: rack load is less than compressor 1 low-limit frequency cold and exports, and has dehumidification etc.
S200, when rack heat load be less than cold that compressor low frequency exports and in rack the humidity of return air be greater than humidity threshold values have a dehumidification time, carry out frequency reducing to compressor to regulate and Controlling solenoid valve closed portion evaporator coil, when rack heat load be not less than cold that compressor low frequency exports and in rack the humidity of return air be not more than humidity threshold values have a dehumidification time, adapt to carry out raising frequency to compressor or frequency reducing regulates.
Namely precision air conditioner controller is when normally running, by the temperature of return air in Real-time Collection air-conditioning and relative humidity, when detecting in rack without refrigeration demand, and return air humidity higher than humidity threshold values time, have dehumidification, this Time Controller exports dehumidifying instruction, opens dehumidification function.In case of a low load, by closed portion coil pipe, reduce aobvious cold and export, strengthen moisture removal, relative humidity can be controlled in setting range, guarantee cabinet-type data center and modular data center server apparatus stable and reliable.When without dehumidification, by adapting to the loading demand in rack to compressor 1 raising frequency or the suitable cold of frequency reducing regulation output.
S300, when in-cabinet temperature in dehumidification process reach dehumidifying low temperature threshold values time, opening controlled ptc heater is that cabinet-heating is in order to stabilizing machine in-cabinet temperature.Namely export cold when rack heat load is less than compressor low-limit frequency, when the temperature in dehumidification process in rack reaches dehumidifying low temperature threshold values, open the temperature in controllable silicon ptc heater, control ptc heater electrodeless regulation output heat maintenance rack.
Concrete, export when rack load is less than compressor 1 low-limit frequency cold, when compressor 1 is by being down to low-limit frequency, refrigerating capacity exports and is still greater than rack load, if now open dehumidification function, interior of equipment cabinet temperature still can progressively decline, now, cabinet air conditioner can start the PTC electrical heating that controllable silicon for subsequent use regulates, and adds heat, now add heat and only need export the very little temperature stabilization that can meet interior of equipment cabinet by the electrodeless output of ptc heater 8; After subsequent clients is rack loading, whether controller can work in intelligent decision controllable silicon PTC electrical heating, does not waste client's energy, is applicable to various exceedingly odious low load applications situation.
Further, also comprise before described step S100: the humidity threshold values contrasted with return air humidity parameter in rack is set, and the dehumidifying low temperature threshold values for judging whether to open ptc heater is set.
Concrete, when rack heat load be not less than cold that compressor 1 low frequency exports and in rack the humidity of return air be not more than humidity threshold values have a dehumidification time, adapt to carry out raising frequency to compressor 1 or frequency reducing regulates.
When rack load be greater than compressor 1 low frequency cold export and without dehumidification time, the controller of rack precision air conditioner is when normally running, return air humiture probe can be continued through and detect return air temperature and relative humidity in rack, when detecting that rack load is larger, compressor 1 can carry out raising frequency adjustment, and the magnetic valve 4 that now dehumidifies is failure to actuate, and the overall pipe of evaporimeter 5 uses, the cold of compressor 1 raising frequency output matching heat load, adapts to cabinet internal burden demand.
When rack load to mate with compressor 1 low frequency cold and without dehumidification time, rack precision air conditioner controller is when normally running, continue through return air humiture probe and detect return air temperature and relative humidity in rack, when detecting that rack load is lower, compressor 1 can carry out frequency reducing adjustment, export suitable cold, adapt to cabinet internal burden demand.
When rack load be less than compressor 1 low-limit frequency cold coupling and without dehumidification time, rack precision air conditioner controller is when normally running, continue through return air humiture probe and detect return air temperature and relative humidity in rack, when detecting that rack load is very low, compressor 1 can carry out frequency reducing adjustment, export minimum cold, the part coil pipe of evaporimeter 5 is closed in magnetic valve 4 action simultaneously, reduce evaporimeter 5 and show cold output, by mixed wind effect, adapt to cabinet internal burden demand, now in-cabinet temperature is stabilized in setting range and pinches.
Known, when equipment cabinet server underload, compressor 1, by variable frequency adjustment, adopts low frequency running, reduces compressor 1 refrigerating capacity, reach the object of saving the energy; When client loads for rack, compressor 1 energy regulating frequency automatically, to adapt to rack load refrigeration requirement.
Cold is exported when rack heat load is less than compressor 1 low-limit frequency, and when in rack, the humidity of return air is higher than humidity threshold values, regulate compressor 1 to be downconverted to minimum cold to export and opens solenoid valve 4 closed portion evaporimeter 5 coil pipe, make return air stream be mixed for controlling interior temperature and the humidity of rack with the low-temperature airflow flowing through evaporimeter 5 coil pipe.
Namely when rack load is greater than that in compressor 1 low-limit frequency cold output detections to rack, return air humidity is higher than humidity threshold values, namely there is dehumidification, this Time Controller exports dehumidifying instruction, compressor 1 carries out frequency reducing and is adjusted to the output of minimum refrigerating capacity, now magnetic valve 4 action, closed portion evaporimeter 5 coil pipe, strengthen effect on moisture extraction, and the part coil pipe of cutting out circulates without low-temperature low-pressure refrigerant, by being inner blower 7, return air stream is mixed with the low-temperature airflow flowing through dehumidifying coil, make air conditioning exhausting temperature can not be too low, guarantee that compressor 1 can carry out refrigerated dehumidification for a long time, control interior of equipment cabinet humiture.
When rack load is less than the output of compressor 1 low-limit frequency cold, interior of equipment cabinet temperature can decline gradually, when detecting that in rack, return air humidity is higher than humidity threshold values, namely there is dehumidification, this Time Controller exports dehumidifying instruction, compressor 1 carries out frequency reducing and is adjusted to the output of minimum refrigerating capacity, now magnetic valve 4 action, closed portion evaporimeter 5 coil pipe, strengthen effect on moisture extraction, and the part coil pipe of cutting out circulates without low-temperature low-pressure refrigerant, the return air stream passed through mixes with the low-temperature airflow flowing through dehumidifying coil, air conditioning exhausting temperature can not be declined too fast, when air-conditioning control panel detects that in-cabinet temperature drops to low temperature qualified point, open controllable silicon PTC electrical heating for subsequent use, ptc heater 8 mates with cold, electrodeless regulation output heat, guarantee that machine in-cabinet temperature can not continue to decline, compressor 1 can dehumidify for a long time, stablize humiture in cabinet.
The rack precision air conditioner of the band underload refrigerated dehumidification of patent of the present invention, compressor 1 adopts varying capacity to regulate, evaporimeter 5 adopts part coil pipe dehumidification design, add the electrically heated standby functions of controllable silicon PTC, be applicable to the various situation application of rack data center and modular data center, and easy for installation, maintenance is few, compressor 1 reliability is high, saves the energy.
With the rack precision air conditioner of underload refrigerated dehumidification function, refrigeration module core component is frequency-changeable compressor 1, and the core component of dehumidification module is evaporation coil.In the application scenario of rack underload, when having dehumidification, compressor 1 frequency reducing regulates, the action of precision air conditioner control panel Based Intelligent Control magnetic valve 4, closed portion evaporimeter 5 stream, thus reduces evaporating temperature, reaches better effect on moisture extraction.On the other hand, the part coil pipe of cutting out is not owing to passing into the liquid refrigerant of low-temp low-pressure, during this part coil pipe of airflow passes, substantially not heat exchange, the substantially constant air-flow of this portion temperature is with after the low-temperature airflow of the heat exchange that dehumidifies mixes, can guarantee that leaving air temp can not be too low, never avoid the risk of rack condensation.
When rack load is very low, compressor 1 carries out frequency reducing adjustment, no matter whether there is dehumidification, if when controller detects that temperature drops to qualified point, automatic opens solenoid valve 4, closes the part coil pipe of evaporimeter 5, increase the flow velocity of cold-producing medium in evaporator coil, guarantee that compressor 1 is when low frequency is run, oil return effect is still excellent, avoids compressor 1 low frequency to run oil return bad and then burn the risk of compressor 1.
Refer to Fig. 2, the present invention is based on the dehumidification control system that above-mentioned control method also provides a kind of underload refrigerated dehumidification air-conditioning, comprising:
Contrast judge module 410, for selecting the function of opening refrigeration or dehumidifying in rack according to the humidity of return air in rack; ; As detailed above.
Adjustment module 420; for be less than cold that compressor low frequency exports when rack heat load and in rack the humidity of return air be greater than humidity threshold values have a dehumidification time; carry out frequency reducing to compressor to regulate and Controlling solenoid valve closed portion evaporator coil; when rack heat load be not less than cold that compressor low frequency exports and in rack the humidity of return air be not more than humidity threshold values have a dehumidification time, adapt to carry out raising frequency to compressor or frequency reducing regulates; As detailed above.
Heating module 430, during for reaching dehumidifying low temperature threshold values when in-cabinet temperature in dehumidification process, opening controlled ptc heater is that cabinet-heating is in order to stabilizing machine in-cabinet temperature; As detailed above.
In the dehumidification control system of described underload refrigerated dehumidification air-conditioning, also comprise and pre-set module, it is for arranging the humidity threshold values contrasted with return air humidity parameter in rack, and arranges the dehumidifying low temperature threshold values for judging whether to open ptc heater; As detailed above.
In the dehumidification control system of described underload refrigerated dehumidification air-conditioning, described adjustment module 420 comprises:
First regulon; cold is exported for being greater than compressor low-limit frequency when rack heat load; and when in rack, the humidity of return air is higher than humidity threshold values; regulate compressor to be downconverted to minimum cold to export and opens solenoid valve closed portion evaporator coil, make the return air stream of the evaporator coil flowing through closedown (this fraction has neither part nor lot in heat exchange) be mixed for controlling interior temperature and the humidity of rack with the low-temperature airflow flowing through evaporator coil; As detailed above.
In the dehumidification control system of described underload refrigerated dehumidification air-conditioning, described adjustment module 420 also comprises:
Second adjustment module, for be not less than cold that compressor low frequency exports when rack heat load and in rack the humidity of return air be not more than humidity threshold values have a dehumidification time, adapt to carry out raising frequency to compressor or frequency reducing regulates; As detailed above.
In the dehumidification control system of described underload refrigerated dehumidification air-conditioning; described heating module 430; also export cold for being less than compressor low-limit frequency when rack heat load; when temperature in dehumidification process in rack reaches initial cryogenic threshold values, open the temperature in controllable silicon ptc heater, control ptc heater 8 electrodeless regulation output heat maintenance rack; As detailed above.
A kind of underload refrigerated dehumidification air-conditioning, comprises the dehumidification control system of the underload refrigerated dehumidification air-conditioning of above-mentioned any one.Be noted that modular data center (frequency-changeable compressor adds part coil pipe) underload refrigerated dehumidification method application, also should belong in this type of design protection category.
In sum, the dehumidification control method of a kind of underload refrigerated dehumidification air-conditioning provided, system and air-conditioning are provided, by the combination of compressor variable capacity regulating technology and part coil pipe dehumidifying technology, structural design is simple and reliable, action component is few, dehumidification rate is high, in rack data center, load is low, when envionmental humidity is high, carry out Intelligent dehumidifying, in conjunction with compressor variable frequency function, control temperature and moisture stable, in range of set value, ensure that cabinet-type data center and modular data center product normally run throughout the year.
Should be understood that, application of the present invention is not limited to above-mentioned citing, for those of ordinary skills, can be improved according to the above description or convert, and such as, all these improve and convert the protection domain that all should belong to claims of the present invention.
Claims (10)
1. a dehumidification control method for underload refrigerated dehumidification air-conditioning, is characterized in that, comprises the following steps:
A, select the function of opening refrigeration or dehumidifying in rack according to the humidity of return air in rack;
B, when rack heat load be less than cold that compressor low frequency exports and in rack the humidity of return air be greater than humidity threshold values have a dehumidification time, carry out frequency reducing to compressor to regulate and Controlling solenoid valve closed portion evaporator coil, when rack heat load be not less than cold that compressor low frequency exports and in rack the humidity of return air be not more than humidity threshold values have a dehumidification time, adapt to carry out raising frequency to compressor or frequency reducing regulates;
C, when in-cabinet temperature in dehumidification process reach dehumidifying low temperature threshold values time, opening controlled ptc heater is that cabinet-heating is in order to stabilizing machine in-cabinet temperature.
2. the dehumidification control method of underload refrigerated dehumidification air-conditioning according to claim 1, is characterized in that, also comprise step S before described steps A:
The humidity threshold values contrasted with return air humidity parameter in rack is set, and the dehumidifying low temperature threshold values for judging whether to open ptc heater is set.
3. the dehumidification control method of underload refrigerated dehumidification air-conditioning according to claim 1, it is characterized in that, described step B specifically comprises:
Cold is exported when rack heat load is less than compressor low-limit frequency, and when in rack, the humidity of return air is higher than humidity threshold values, regulate compressor to be downconverted to minimum cold to export and opens solenoid valve closed portion evaporator coil, the return air stream making the evaporator coil flowing through closedown and the low-temperature airflow flowing through evaporator coil are mixed for the interior temperature and the humidity that control rack;
When rack heat load be not less than cold that compressor low frequency exports and in rack the humidity of return air be not more than humidity threshold values have a dehumidification time, adapt to carry out raising frequency to compressor or frequency reducing regulates.
4. judge that temperature prioritised or humidity is preferential with Time Controller according to humiture, thus judge that system is opened refrigeration or dehumidifies.
5. the dehumidification control method of underload refrigerated dehumidification air-conditioning according to claim 1, it is characterized in that, described step C specifically also comprises:
Export cold when rack heat load is less than compressor low-limit frequency, when the temperature in dehumidification process in rack reaches dehumidifying low temperature threshold values, open the temperature in controllable silicon ptc heater, control ptc heater electrodeless regulation output heat maintenance rack.
6. a dehumidification control system for underload refrigerated dehumidification air-conditioning, is characterized in that, comprising:
Contrast judge module, for selecting the function of opening refrigeration or dehumidifying in rack according to the humidity of return air in rack; ;
Adjustment module, for be less than cold that compressor low frequency exports when rack heat load and in rack the humidity of return air be greater than humidity threshold values have a dehumidification time, carry out frequency reducing to compressor to regulate and Controlling solenoid valve closed portion evaporator coil, when rack heat load be not less than cold that compressor low frequency exports and in rack the humidity of return air be not more than humidity threshold values have a dehumidification time, adapt to carry out raising frequency to compressor or frequency reducing regulates;
Heating module, during for reaching dehumidifying low temperature threshold values when in-cabinet temperature in dehumidification process, opening controlled ptc heater is that cabinet-heating is in order to stabilizing machine in-cabinet temperature.
7. the dehumidification control system of underload refrigerated dehumidification air-conditioning according to claim 5, it is characterized in that, also comprise and pre-set module, it is for arranging the humidity threshold values contrasted with return air humidity parameter in rack, and arranges the dehumidifying low temperature threshold values for judging whether to open ptc heater.
8. the dehumidification control system of underload refrigerated dehumidification air-conditioning according to claim 5, it is characterized in that, described adjustment module comprises:
First regulon, cold is exported for being less than compressor low-limit frequency when rack heat load, and when in rack, the humidity of return air is higher than humidity threshold values, regulate compressor to be downconverted to minimum cold to export and opens solenoid valve closed portion evaporator coil, the return air stream making the evaporator coil flowing through closedown and the low-temperature airflow flowing through evaporator coil are mixed for the interior temperature and the humidity that control rack;
Second adjustment module, for be not less than cold that compressor low frequency exports when rack heat load and in rack the humidity of return air be not more than humidity threshold values have a dehumidification time, adapt to carry out raising frequency to compressor or frequency reducing regulates.
9. the dehumidification control system of underload refrigerated dehumidification air-conditioning according to claim 5, it is characterized in that, described heating module, also export cold for being less than compressor low-limit frequency when rack heat load, when temperature in dehumidification process in rack reaches dehumidifying low temperature threshold values, open the temperature in controllable silicon ptc heater, control PCT heater electrodeless regulation output heat maintenance rack.
10. a underload refrigerated dehumidification air-conditioning, is characterized in that, comprises the dehumidification control system of the underload refrigerated dehumidification air-conditioning described in any one of claim 5 to 9.
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