CN108088012A - A kind of heat pipe combined type computer-room air conditioning system of frequency conversion and its control method - Google Patents
A kind of heat pipe combined type computer-room air conditioning system of frequency conversion and its control method Download PDFInfo
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- CN108088012A CN108088012A CN201810040089.2A CN201810040089A CN108088012A CN 108088012 A CN108088012 A CN 108088012A CN 201810040089 A CN201810040089 A CN 201810040089A CN 108088012 A CN108088012 A CN 108088012A
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 8
- 238000005057 refrigeration Methods 0.000 claims abstract description 69
- 239000007788 liquid Substances 0.000 claims abstract description 52
- 230000007704 transition Effects 0.000 claims abstract description 37
- 239000011521 glass Substances 0.000 claims abstract description 10
- 238000001816 cooling Methods 0.000 claims abstract description 9
- 230000009467 reduction Effects 0.000 claims abstract description 8
- 239000002131 composite material Substances 0.000 claims description 34
- 239000003507 refrigerant Substances 0.000 claims description 23
- 238000007906 compression Methods 0.000 claims description 17
- 230000006835 compression Effects 0.000 claims description 15
- 150000001875 compounds Chemical class 0.000 claims description 5
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- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000005265 energy consumption Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 5
- 239000003921 oil Substances 0.000 description 52
- 238000010586 diagram Methods 0.000 description 13
- 238000001704 evaporation Methods 0.000 description 6
- 238000009833 condensation Methods 0.000 description 4
- 230000005494 condensation Effects 0.000 description 4
- 239000010687 lubricating oil Substances 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
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- 238000005516 engineering process Methods 0.000 description 2
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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
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
- F24F5/001—Compression cycle type
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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
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0046—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater using natural energy, e.g. solar energy, energy from the ground
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Abstract
The invention discloses a kind of heat pipe combined type computer-room air conditioning system of frequency conversion, including cold source system, main control unit and temperature collecting cell.Cold source system includes compressor, check valve, oil eliminator, condenser, filter, liquid-sighting glass, flow apparatus, evaporator and gas-liquid separator；Main control unit is connected respectively with cold source system and temperature collecting cell；Temperature collecting cell gathers indoor and outdoor temperature, and main control unit is made to control compressor, the wind turbine of condenser and the operating status of flow apparatus according to indoor and outdoor temperature.The invention also discloses a kind of control methods of the heat pipe combined type computer-room air conditioning system of frequency conversion, the operating status of compressor, flow apparatus and condenser can be adjusted according to indoor load and the difference of outdoor temperature or indoor temperature and outdoor temperature, cold source system is made to be switched to refrigeration respectively, transition or heat pipe circulation mode, can efficiently use round the clock, transition season and the outdoor natural cooling source in winter, operation energy consumption is greatly lowered, there is excellent effects of energy saving and emission reduction.
Description
Technical Field
The invention relates to a variable frequency heat pipe composite type machine room air conditioning system and a control method thereof.
Background
The rapid development of information industry and digital construction promotes the number of machine rooms and base stations, the construction scale is rapidly increased, and the energy consumption of the air conditioners of the machine rooms and the base stations accounts for 40% -50% of the total energy consumption according to statistics. The sensible heat load ratio of machine room, base station is big, need continuous operation throughout the year, and in the season that indoor side settlement temperature is less than outdoor side temperature, conventional air conditioning system still need continue to operate compression refrigerating system, and refrigerating system work efficiency is low and easily breaks down, if can utilize indoor outer difference in temperature low-cost transport heat or for indoor side provides cold volume, will reduce air conditioning system's energy consumption and running cost greatly. The refrigerating system can be efficiently operated by utilizing the land cooling in high-temperature seasons such as summer and the like. And the energy efficiency of the system is greatly improved. The method of providing cold energy to indoor side by using outdoor low-temperature air has been paid attention by the researchers and the engineers in the industry, and the researches on engineering technology are developed in different forms, such as the currently adopted fresh air system, the air-air and air-water heat exchange systems in different forms, and the composite air conditioner applying the heat pipe technology.
The Chinese invention patent application CN201010528027.X discloses an air-cooled air pump composite air-conditioning system for a machine room, which has two working modes of compression refrigeration and heat pipe circulation refrigeration. When the outdoor temperature is more than or equal to 20 ℃, the refrigeration mode works, a first refrigeration working medium participating in refrigeration cycle is evaporated and absorbs heat in the evaporative condenser, and a second refrigeration working medium is cooled and condensed; when the outdoor temperature is less than 20 ℃, the system is switched to a heat pipe circulation refrigeration mode, the second refrigeration working medium is cooled and condensed by using outdoor low-temperature air, and the compression refrigeration cycle stops working, so that the energy consumption of the air conditioner all year round is effectively reduced. The system makes up the defects of the former two systems in the aspects of utilizing the cold energy of outdoor low-temperature air and ensuring the quality of indoor air, but the two working modes of compression type refrigeration and heat pipe circulation refrigeration are switched at a certain temperature point, and whether the refrigeration capacity of the system can be stably connected and reliably works or not is worth considering; meanwhile, the lower upper limit temperature of the heat pipe in the circulating work is not favorable for maximizing the utilization of the cold quantity of the outdoor low-temperature air.
Utility model patent CN01278831.7 discloses a take energy-saving refrigeration cycle device of circulating pump, use the circulating pump to be favorable to improving the endless work efficiency of heat pipe in heat pipe circulation system, to condenser, reservoir and evaporimeter relative position's requirement when also having simplified heat pipe system installation, nevertheless CN01278831.7 is similar with CN201010528027.X in the aspect of the cold volume of the outdoor low temperature air of maximize utilization, the upper limit temperature of heat pipe cycle work must be lower just can link up steadily with refrigeration cycle promptly.
The invention patent ZL201210037332.8 and the invention patent ZL201210037082.8 provide a heat pipe compound machine room air conditioning system with a compound area, a power type separated heat pipe system and a vapor compression type refrigerating system are combined at a middle condensation evaporator (an evaporation coil), and the refrigerating system compensates cold for the heat pipe system in a transition season, so that a working temperature area of the heat pipe system is widened. However, in the patent ZL201210037082.8, the cold energy is provided for the tail end in a secondary heat exchange mode in the refrigeration mode, and the refrigeration efficiency of the system is reduced; when the ZL201210037332.8 mode is switched between the refrigeration mode and the heat pipe mode, the cold output of the system is unstable, and the transition is not stable.
The patent ZL201610174000.2 of the invention provides a gas-phase supercharging heat pipe composite air conditioner, the system has two working modes of gas-phase heat pipe circulation and vapor compression refrigeration circulation, and a large amount of natural cold sources in the two mode intervals are not fully utilized.
At present, a variable-frequency heat pipe composite air conditioner which infinitely constructs a heat pipe system according to indoor and outdoor temperature difference has not been proposed, and a heat pipe working temperature region is not proposed to be widened in spring and autumn transition seasons, refrigeration is carried out according to the needs according to the condensation defects of the heat pipe, meanwhile, various modes are switched to the outdoor side, and the tail end cold output is kept stable.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a frequency conversion heat pipe composite type machine room air conditioning system which can maximally utilize a natural cold source and infinitely construct heat pipe circulation according to indoor and outdoor temperature difference and a control method thereof.
One technical scheme for achieving the purpose of the invention is as follows: a frequency conversion heat pipe composite type air conditioning system for a machine room comprises a cold source system, a main control unit and a temperature acquisition unit, wherein,
the cold source system comprises a compressor, an oil separator, a condenser, a filter, a liquid viewing mirror, a flow device, an evaporator and a gas-liquid separator;
the compressor is composed of one or more compressors which are connected in parallel and provided with an exhaust port and an air suction port, each compressor operates under the condition that the compression ratio is more than or equal to 1.0 and less than or equal to epsilon and less than or equal to 8.0, and the exhaust port of each compressor is respectively connected with the inlet of a one-way valve;
the inlet of the oil separator is communicated with the outlet of each one-way valve, and the oil return port of the oil separator is communicated with the air suction port of the compressor through an oil return capillary tube;
the inlet of the condenser is communicated with the outlet of the oil separator;
the inlet of the filter is communicated with the outlet of the condenser and is used for removing impurities and moisture in the refrigerant;
the inlet of the liquid sight glass is communicated with the outlet of the filter to observe whether the filling amount of the refrigerant is enough and whether the refrigerant contains moisture or not;
the inlet of the flow device is communicated with the outlet of the liquid viewing mirror, and the flow device has the function of adjusting the flow in a wide range;
the inlet of the evaporator is communicated with the outlet of the flow device;
the inlet of the gas-liquid separator is communicated with the outlet of the evaporator, and the outlet of the gas-liquid separator is communicated with the air suction port of the compressor;
the main control unit is in signal connection with the cold source system;
the temperature acquisition unit is used for acquiring outdoor temperature and indoor temperature and is in signal connection with the main control unit, so that the main control unit controls the running states of the compressor, the fan of the condenser and the flow device according to the indoor and outdoor temperatures.
In the above mentioned frequency conversion heat pipe composite air conditioning system, the cold source system further comprises a liquid storage device connected between the condenser and the filter.
In the above variable frequency heat pipe composite air conditioning system, the condenser is an air-cooled condenser, a water-cooled condenser or an evaporative condenser.
In the above-mentioned variable-frequency heat pipe composite air conditioning system, the flow device is a single electronic expansion valve, or two electronic expansion valves are connected in parallel, or an electronic expansion valve is connected in parallel with an electromagnetic valve, or an electric flow regulating valve is connected in parallel with an electronic expansion valve.
In the above frequency conversion heat pipe composite air conditioning system, a quick oil return passage is further included between the oil return port of the oil separator and the air suction port of the compressor, and the quick oil return passage includes a quick oil return capillary tube with a length smaller than that of the oil return capillary tube and an oil return electromagnetic valve installed on the quick oil return capillary tube.
The other technical scheme for realizing the purpose of the invention is as follows: a control method based on the variable-frequency heat pipe composite air conditioning system comprises the following steps:
dividing the outdoor temperature T0 or the difference delta T-T0 between the indoor temperature T and the outdoor temperature T0 into three functional areas, which are respectively: a refrigeration zone, a transition zone, and a heat pipe zone;
the refrigeration area is as follows: t0 is more than or equal to T2; the transition zone is: t2 > T0 > T1; the hot tube zone is: t0 is less than or equal to T1;
wherein T1 and T2 are set according to specific working conditions, and T2 is more than T1;
or, the refrigeration area is: delta T is less than or equal to Ta; the transition zone is: tb is more than delta T and more than Ta; the hot tube zone is: delta T is more than or equal to Tb;
wherein Ta and Tb are set according to specific working conditions, and Tb is greater than Ta;
correspondingly switching the cold source system to operate in a refrigeration cycle mode, a transition cycle mode and a heat pipe cycle mode aiming at different functional areas where different outdoor temperatures T0 or delta T are located;
and the refrigeration circulation mode corresponding to the refrigeration area is as follows: a refrigeration working medium loop is formed by a compressor, a one-way valve, an oil separator, a condenser, a filter, a liquid sight glass, a flow device, an evaporator and a gas-liquid separator;
transition cycle mode corresponding to the transition zone: a refrigeration working medium loop is formed by a compressor, a one-way valve, an oil separator, a condenser, a filter, a liquid sight glass, a flow device, an evaporator and a gas-liquid separator;
the heat pipe circulation mode corresponding to the heat pipe area is as follows: the refrigerating working medium loop is composed of a compressor, a one-way valve, an oil separator, a condenser, a filter, a liquid viewing mirror, a flow device, an evaporator and a gas-liquid separator.
When the cold source system operates in a refrigeration cycle mode, the flow device is a throttling device, throttling and pressure reducing are carried out, high-pressure liquid refrigerant from the condenser is throttled and pressure reduced to be refrigerant in a low-temperature and low-pressure state, and the main control unit determines the rotating speed of the compressor, the opening of the flow device and the rotating speed of the fan of the condenser according to the indoor load and the outdoor temperature T0 or the difference delta T between the indoor temperature T and the outdoor temperature T0 so as to realize accurate adjustment of cold.
In the control method of the variable-frequency heat pipe composite air conditioning system, when the cold source system operates in the transition circulation mode, the flow device is at a proper opening degree, proper throttling and pressure reduction are carried out, heat pipe circulation is constructed, and medium-pressure liquid refrigerant from the condenser is throttled and reduced into refrigerant in a low-temperature and low-pressure state; the main control unit adjusts the rotating speed of the compressor, the rotating speed of the fan of the condenser and the proper opening degree of the flow device according to the indoor load and the outdoor temperature T0 or the difference delta T between the indoor temperature T and the outdoor temperature T0 to realize the accurate adjustment of the cooling capacity.
According to the control method of the variable-frequency heat pipe composite air conditioning system, when the cold source system operates in the heat pipe circulation mode, the flow device is in the fully-open state, throttling and pressure reduction are not performed, heat pipe circulation is completely achieved, and the main control unit determines the rotating speed of the compressor and the rotating speed of the fan of the condenser according to the indoor load and the outdoor temperature T0 or the difference delta T between the indoor temperature T and the outdoor temperature T0, so that cold quantity is accurately adjusted.
In the control method of the variable-frequency heat pipe type machine room air conditioning system, when the cold source system switches the operation mode, a temperature difference method and a delay control method are adopted for switching; namely the set outdoor temperature deviation deltat 0 and the hold time deltat,
when the outdoor temperature T0 is more than or equal to T2+ delta T0 and the time delta T is maintained, the cold source system is switched to a refrigeration circulation mode;
when the outdoor temperature T2+ delta T0 > T0 > T1-delta T0 and the time delta T is maintained, the cold source system is switched to a transition circulation mode;
when the outdoor temperature T0 is not more than T1-delta T0 and the maintaining time is delta T, the cold source system is switched to a heat pipe circulation mode;
the outdoor temperature deviation Δ T0 and the maintenance time Δ T are set as the case may be.
The invention relates to a variable-frequency heat pipe composite type machine room air conditioning system and a control method thereof.A cold source system is respectively switched into a refrigeration circulation mode, a transition circulation mode or a heat pipe circulation mode according to an indoor load, an outdoor temperature T0 or a difference delta T between the indoor temperature T and the outdoor temperature T0, namely T-T0, the running state of a compressor, the switching state of a throttling device and the running state of a condenser, and the refrigeration circulation mode, the transition circulation mode or the heat pipe circulation mode share a cold source system loop. The compressor adopted by the invention combines the functions of a conventional compressor (the compression ratio is more than or equal to 1.4 and less than or equal to 8.0) and an air pump (the compression ratio is more than or equal to 1.0 and less than or equal to epsilon and less than or equal to 1.4), namely the compressor is used as a supercharger capable of steplessly changing the compression ratio (the compression ratio is more than or equal to 1.0 and less than or equal to 8), so that the energy-saving refrigeration range of the existing compressor is widened, the unit cost of the existing composite air-conditioning system is greatly reduced, the system structure is simplified, and the maintenance difficulty; meanwhile, outdoor natural cold sources in day and night, transition seasons and winter can be effectively utilized, the operation energy consumption is greatly reduced, and the energy-saving and emission-reducing effects are excellent.
Drawings
FIG. 1 is a schematic diagram of a first structure of a variable frequency heat pipe composite type air conditioning system of a machine room of the invention;
FIG. 2 is a schematic diagram of a second structure of the variable frequency heat pipe composite type air conditioning system of the machine room of the present invention;
FIG. 3 is a schematic diagram of a third structure of the variable frequency heat pipe composite air conditioning system of the present invention;
FIG. 4 is a schematic diagram of a fourth structure of the variable frequency heat pipe composite air conditioning system of the present invention;
FIG. 5 is a schematic diagram of a fifth structure of the inverter heat pipe composite air conditioning system of the present invention;
FIG. 6 is a schematic diagram of a control method of the variable frequency heat pipe composite type air conditioning system of the present invention;
FIG. 7 is a pressure-enthalpy diagram of the inverter heat pipe compound type air conditioning system of the present invention operating in the refrigeration cycle mode;
FIG. 8 is a pressure-enthalpy diagram of the variable frequency heat pipe compound air conditioning system of the present invention operating in the transition circulation mode;
FIG. 9 is a pressure-enthalpy diagram of the variable frequency heat pipe composite air conditioning system of the present invention operating in the heat pipe circulation mode;
Detailed Description
The invention will be further explained with reference to the drawings.
Referring to fig. 1 to 9, the variable frequency heat pipe composite air conditioning system for a machine room of the present invention includes a cold source system, a main control unit and a temperature collecting unit, wherein:
the cold source system comprises a compressor 1, an oil separator 3, a condenser 4, a filter 5, a liquid viewing mirror 6, a flow device, an evaporator 8 and a gas-liquid separator 9;
the compressor 1 is composed of one or more compressors which are connected in parallel and are provided with an exhaust port and an air suction port, each compressor 1 has a conventional vapor compression refrigeration function and a pump function, and each compressor 1 operates under the condition that the compression ratio is 1.0-8.0; the exhaust port of each compressor 1 is respectively connected with the inlet of one-way valve 2;
the inlet of the oil separator 3 is communicated with the outlet of each one-way valve 2, and the oil return port of the oil separator 3 is communicated with the air suction port of the compressor 1 through an oil return capillary tube 30;
the inlet of the condenser 4 is communicated with the outlet of the oil separator 3; the condenser 4 is an air-cooled condenser, a water-cooled condenser or an evaporative condenser;
the inlet of the filter 5 is communicated with the outlet of the condenser 4 to remove impurities and moisture in the refrigerant;
the inlet of the liquid viewing mirror 6 is communicated with the outlet of the filter 5 to observe whether the charging amount of the refrigerant is enough and whether the refrigerant contains moisture;
the inlet of the flow device is communicated with the outlet of the liquid viewing mirror 6, the flow device has the function of adjusting the flow in a wide range, and the flow device is a single electronic expansion valve, or two electronic expansion valves are connected in parallel, or the electronic expansion valve is connected with an electromagnetic valve in parallel, or an electric flow adjusting valve is connected with the electronic expansion valve in parallel; the flow device of the present embodiment is a single electronic expansion valve 7;
the inlet of the evaporator 8 is communicated with the outlet of the flow device;
the inlet of the gas-liquid separator 9 is communicated with the outlet of the evaporator 8, and the outlet of the gas-liquid separator 8 is communicated with the air suction port of the compressor 1;
the main control unit is in signal connection with the cold source system;
the temperature acquisition unit is used for acquiring outdoor temperature and indoor temperature and is in signal connection with the main control unit, so that the main control unit controls the running states of the fans of the compressor 1 and the condenser 4 and the flow device according to the indoor temperature and the outdoor temperature.
In a second embodiment, the flow means are two electronic expansion valves 7 in parallel (see fig. 2);
in the third embodiment, the flow device is an electronic expansion valve 7 and a solenoid valve 71 (see fig. 3) connected in parallel;
in the fourth embodiment, the flow device is a single electronic expansion valve 7, and a fast oil return passage is further included between the oil return port of the oil separator 3 and the air suction port of the compressor 1, and the fast oil return passage includes a fast oil return capillary tube 31 having a length smaller than that of the oil return capillary tube 30 and an oil return solenoid valve 32 (see fig. 4) mounted on the fast oil return capillary tube 31.
In the fifth embodiment, the flow device is an electronic expansion valve 7 and an electromagnetic valve 71 which are connected in parallel, a quick oil return passage is further included between an oil return port of the oil separator 3 and an air suction port of the compressor 1, and the quick oil return passage includes a quick oil return capillary tube 31 which is shorter than the oil return capillary tube 30 and an oil return electromagnetic valve 32 (see fig. 5) which is installed on the quick oil return capillary tube 31;
the invention discloses a control method based on the variable frequency heat pipe composite air conditioning system, which is used for switching the running mode of a cold source system, accurately regulating and controlling the refrigerating capacity and returning oil to the system, and the control method specifically comprises the following steps:
the outdoor temperature T0 or the difference between the indoor temperature T and the outdoor temperature T0, T-T0 is divided into three functional areas, which are: a refrigeration zone, a transition zone, and a heat pipe zone;
the refrigerating area is as follows: the outdoor temperature T0 is more than or equal to T2; the transition zone is: the outdoor temperature T2 is more than T0 is more than T1; the hot tube zone is: the outdoor temperature T0 is not more than T1;
wherein T1 and T2 are set according to specific working conditions, and T2 is more than T1;
or, the refrigeration area is: delta T is less than or equal to Ta; the transition zone is: tb is more than delta T and more than Ta; the hot tube zone is: delta T is more than or equal to Tb;
wherein Ta and Tb are set according to specific working conditions, and Tb is greater than Ta;
correspondingly switching the cold source system to operate in a refrigeration cycle mode, a transition cycle mode and a heat pipe cycle mode (see fig. 6) according to different functional areas where different outdoor temperatures T0 or Δ T are located;
and (3) corresponding to the refrigeration circulation mode of the refrigeration area: the refrigeration working medium loop is composed of a compressor 1, a one-way valve 2, an oil separator 3, a condenser 4, a filter 5, a sight glass 6, a flow device, an evaporator 8 and a gas-liquid separator 9, wherein the flow device is a throttling device (an electronic expansion valve 7), throttling and depressurizing are carried out, high-pressure liquid refrigerant from the condenser 4 is throttled and depressurized into refrigerant in a low-temperature and low-pressure state, and a main control unit determines the rotating speed of the compressor 1, the opening degree of the flow device 7 and the rotating speed of a fan of the condenser 4 according to the indoor load and the difference delta T0 between the outdoor temperature T and the outdoor temperature T0 to realize accurate adjustment of refrigeration capacity;
transition cycle mode for the transition zone: a refrigerating working medium loop is formed by a compressor 1, a one-way valve 2, an oil separator 3, a condenser 4, a filter 5, a liquid sight glass 6, a flow device, an evaporator 8 and a gas-liquid separator 9, wherein the flow device (an electronic expansion valve 7) is in a proper opening degree at the moment, proper throttling and pressure reduction are carried out, heat pipe circulation is constructed, and medium-pressure liquid refrigerant from the condenser 4 is throttled and reduced into refrigerant in a low-temperature and low-pressure state; the main control unit adjusts the rotating speed of the compressor 1, the rotating speed of a fan of the condenser 4 and the proper opening degree of the flow device 7 according to the outdoor temperature T0 or the difference delta T between the indoor temperature T and the outdoor temperature T0 to realize the accurate adjustment of the cooling capacity;
heat pipe circulation pattern corresponding to the heat pipe area: the refrigeration working medium loop is formed by the compressor 1, the one-way valve 2, the oil separator 3, the condenser 4, the filter 5, the liquid viewing mirror 6, the flow device 7, the evaporator 8 and the gas-liquid separator 9, at the moment, the flow device (the electromagnetic valve 71) is in a full-open state, throttling and pressure reduction are not carried out, heat pipe circulation is completely realized, and the main control unit determines the rotating speed of the compressor 1 and the rotating speed of a fan of the condenser 4 according to the indoor load and the outdoor temperature T0 or the difference delta T between the indoor temperature T and the outdoor temperature T0 so as to realize accurate adjustment of refrigeration quantity.
As shown in fig. 1, when the outdoor temperature difference satisfies T0 > T2, the condition of constructing a heat pipe circulation mode cannot be satisfied, the air conditioning system operates a refrigeration circulation mode, the refrigeration circulation mode is composed of a compressor, a one-way valve, an oil separator, a condenser, a filter, a liquid viewing mirror, a flow device, an evaporator and a gas-liquid separator, low-temperature and low-pressure refrigeration working medium steam is compressed into high-temperature and high-pressure steam by the compressor 1, is cooled into liquid working medium after being subjected to heat release and condensation by the condenser 4, enters a throttling device (an electronic expansion valve 7), is subjected to throttling and pressure reduction by the electronic expansion valve 7, then absorbs heat in the evaporator 8 for evaporation, and returns to an air suction port of the compressor 1 through the gas-liquid; at the moment, the system is normally refrigerated by controlling the running state of the compressor 1, the rotating speed of a fan of the condenser 4 and the opening degree of the electronic expansion valve. As shown in fig. 7, the pressure-enthalpy diagram of the refrigeration cycle mode is shown, wherein 1-2 is the compression process, 2-3 is the condensation process, 3-4 is the throttling process, and 4-1 is the evaporation and heat absorption process. After leaving the evaporator 8, the working medium enters the compressor 1 to perform the 1-2 compression process. When the outdoor temperature T0 is high, the compressor 1 performs mechanical refrigeration, and a high-efficiency refrigeration effect is achieved. The mixture of the refrigeration working medium and the lubricating oil enters the oil separator 3, wherein most of the lubricating oil returns to the compressor 1 through the oil return capillary tube 30, when the operating speed of the compressor 1 is low, that is, when the pressure difference between the exhaust port and the suction port of the compressor 1 is small, the lubricating oil cannot be replenished to the compressor 1 through the oil return capillary tube 30, at this time, a quick oil return channel needs to be opened, that is, an oil return electromagnetic valve 32 is opened, so that most of the lubricating oil returns to the compressor 1 through the quick oil return capillary tube 31.
When the outdoor temperature meets T2 > T0 > T1, in order to realize the energy-saving effect, a cold source system operates in a transition circulation mode, the transition circulation mode is formed by a compressor 1, a one-way valve 2, an oil separator 3, a condenser 4, a filter 5, a liquid sight glass 6, a flow device 7, an evaporator 8 and a gas-liquid separator 9, the operation states of a fan of the compressor 1 and the condenser 4 and an electronic expansion valve 7 are adjusted according to the outdoor temperature T0, heat pipe circulation is formed, the condensing temperature is properly raised (proper condensing temperature), the lower condensing pressure is controlled as far as possible on the premise of meeting enough refrigerating capacity, so that the condensing/evaporating pressure difference of the system is smaller, at the moment, the electronic expansion valve 7 performs proper throttling and pressure reduction, and the medium-pressure liquid refrigerant flowing out of the condenser 4 is throttled and reduced into the refrigerant in a; refrigeration is realized by directly evaporating a refrigeration working medium in the evaporator 8; at the moment, the system compressor 1, the fan of the condenser 4 and the electronic expansion valve 7 are coordinated and matched, and approximate heat pipe circulation is constructed to the maximum extent. As shown in fig. 8, a pressure-enthalpy diagram of the transition cycle mode is composed of a plurality of pressure-enthalpy diagrams similar to the heat pipe cycle, and a plurality of refrigeration systems with stepless variable compression ratios are constructed.
When the outdoor temperature meets T0 or less than T1, in order to realize the energy-saving effect, as shown in the figure, the cold source system operates in a heat pipe circulation mode, the heat pipe circulation mode is formed by a compressor, a one-way valve, an oil separator, a condenser, a filter, a liquid viewing mirror, a flow device, an evaporator and a gas-liquid separator, and at the moment, the flow device (the electromagnetic valve 71) is fully opened, the throttling and pressure reducing effects are not performed, and the heat pipe circulation is completely realized; refrigeration is realized by directly evaporating a refrigeration working medium in the evaporator 8; the system heat pipe refrigeration is realized by controlling the running state of the compressor 1 and the rotating speed of the fan of the condenser 4. Fig. 9 shows a pressure-enthalpy diagram of the heat pipe circulation mode.
For a 38 ℃ constant temperature machine room, if T1 is set to be 15 ℃ and T2 is set to be 25 ℃, when the outdoor temperature T0 is less than or equal to 15 ℃, the cold source system operates in a heat pipe circulation mode, when the temperature is higher than 25 ℃ and higher than T0 and higher than 15 ℃, the cold source system operates in a transition circulation mode, and when the outdoor environment temperature T0 is greater than or equal to 25 ℃, the cold source system operates in a refrigeration circulation mode.
Or: for a 38 ℃ constant temperature machine room, setting Ta to be 13 ℃ and Tb to be 23 ℃, and when the outdoor temperature T0 or the difference delta T between the indoor temperature T and the outdoor temperature T0 is more than or equal to 23 ℃, operating the cold source system in a heat pipe circulation mode; when the temperature is higher than 23 ℃ and delta T is higher than 13 ℃, the cold source system operates in a transition circulation mode; when the delta T is less than or equal to 13 ℃, the cold source system operates in a refrigeration cycle mode.
When the cold source system switches the operation mode, a temperature difference method and a time delay control method can be adopted for switching; namely the set outdoor temperature deviation deltat 0 and the hold time deltat,
when the outdoor temperature T0 is more than or equal to T2+ delta T0 and the time delta T is maintained, the cold source system is switched to a refrigeration circulation mode;
when the outdoor temperature T2+ delta T0 is more than T0 is more than T1-delta T0 and the time delta T is maintained, the cold source system is switched to a transition circulation mode;
when the outdoor temperature T0 is not more than T1-delta T0 and the maintaining time is delta T, the cold source system is switched to a heat pipe circulation mode;
the outdoor temperature deviation Δ T0 and the maintenance time Δ T are set as the case may be.
The above embodiments are provided only for illustrating the present invention and not for limiting the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and therefore all equivalent technical solutions should also fall within the scope of the present invention, and should be defined by the claims.
Claims (10)
1. A frequency conversion heat pipe composite type machine room air conditioning system comprises a cold source system, a main control unit and a temperature acquisition unit, and is characterized in that,
the cold source system comprises a compressor, an oil separator, a condenser, a filter, a liquid viewing mirror, a flow device, an evaporator and a gas-liquid separator; wherein,
the compressor is composed of one or more compressors which are connected in parallel and provided with an exhaust port and an air suction port, each compressor operates under the condition that the compression ratio is more than or equal to 1.0 and less than or equal to epsilon and less than or equal to 8.0, and the exhaust port of each compressor is respectively connected with the inlet of a one-way valve;
the inlet of the oil separator is communicated with the outlet of each one-way valve, and the oil return port of the oil separator is communicated with the air suction port of the compressor through an oil return capillary tube;
the inlet of the condenser is communicated with the outlet of the oil separator;
the inlet of the filter is communicated with the outlet of the condenser and is used for removing impurities and moisture in the refrigerant;
the inlet of the liquid sight glass is communicated with the outlet of the filter to observe whether the filling amount of the refrigerant is enough and whether the refrigerant contains moisture or not;
the inlet of the flow device is communicated with the outlet of the liquid viewing mirror, and the flow device has the function of adjusting the flow in a wide range;
the inlet of the evaporator is communicated with the outlet of the flow device;
the inlet of the gas-liquid separator is communicated with the outlet of the evaporator, and the outlet of the gas-liquid separator is communicated with the air suction port of the compressor;
the main control unit is in signal connection with the cold source system;
the temperature acquisition unit is used for acquiring outdoor temperature and indoor temperature and is in signal connection with the main control unit, so that the main control unit controls the running states of the compressor, the fan of the condenser and the flow device according to the indoor and outdoor temperatures.
2. The variable frequency heat pipe compound air conditioning system as claimed in claim 1, wherein the heat sink system further comprises a reservoir connected between the condenser and the filter.
3. The variable frequency heat pipe composite type air conditioning system according to claim 1 or 2, wherein the condenser is an air-cooled condenser, a water-cooled condenser or an evaporative condenser.
4. The variable frequency heat pipe composite air conditioning system according to claim 1, wherein the flow device is a single electronic expansion valve, or two electronic expansion valves are connected in parallel, or an electronic expansion valve is connected in parallel with a solenoid valve, or an electric flow regulating valve is connected in parallel with an electronic expansion valve.
5. The variable frequency heat pipe composite air conditioning system according to claim 1, further comprising a quick oil return passage between an oil return port of the oil separator and an air suction port of the compressor, wherein the quick oil return passage comprises a quick oil return capillary tube having a length smaller than that of the oil return capillary tube and an oil return solenoid valve installed on the quick oil return capillary tube.
6. A control method of a variable frequency heat pipe composite type air conditioning system based on claim 1 is characterized in that,
dividing the outdoor temperature T0 or the difference delta T-T0 between the indoor temperature T and the outdoor temperature T0 into three functional areas, which are respectively: a refrigeration zone, a transition zone, and a heat pipe zone;
the refrigeration area is as follows: t0 is more than or equal to T2; the transition zone is: t2 > T0 > T1; the hot tube zone is: t0 is less than or equal to T1;
wherein T1 and T2 are set according to specific working conditions, and T2 is more than T1;
or, the refrigeration area is: delta T is less than or equal to Ta; the transition zone is: tb is more than delta T and more than Ta; the hot tube zone is: delta T is more than or equal to Tb;
wherein Ta and Tb are set according to specific working conditions, and Tb is greater than Ta;
correspondingly switching the cold source system to operate in a refrigeration cycle mode, a transition cycle mode and a heat pipe cycle mode aiming at different functional areas where different outdoor temperatures T0 or delta T are located;
and the refrigeration circulation mode corresponding to the refrigeration area is as follows: a refrigeration working medium loop is formed by a compressor, a one-way valve, an oil separator, a condenser, a filter, a liquid sight glass, a flow device, an evaporator and a gas-liquid separator;
transition cycle mode corresponding to the transition zone: a refrigeration working medium loop is formed by a compressor, a one-way valve, an oil separator, a condenser, a filter, a liquid sight glass, a flow device, an evaporator and a gas-liquid separator;
the heat pipe circulation mode corresponding to the heat pipe area is as follows: the refrigerating working medium loop is composed of a compressor, a one-way valve, an oil separator, a condenser, a filter, a liquid viewing mirror, a flow device, an evaporator and a gas-liquid separator.
7. The control method of the variable frequency heat pipe composite air conditioning system as claimed in claim 6, wherein when the cooling source system operates in the cooling circulation mode, the flow device is a throttling device, throttling depressurization is performed to throttle and depressurize the high pressure liquid refrigerant from the condenser into a low temperature and low pressure refrigerant, and the main control unit determines the rotation speed of the compressor, the opening degree of the flow device and the rotation speed of the condenser fan according to the indoor load and the outdoor temperature T0 or the difference Δ T between the indoor temperature T and the outdoor temperature T0 to realize the precise adjustment of the cooling capacity.
8. The control method of a variable frequency heat pipe composite air conditioning system as claimed in claim 6, wherein when the cold source system operates in the transition circulation mode, the flow device is at a proper opening degree, and performs proper throttling depressurization to construct a heat pipe circulation, and the medium pressure liquid refrigerant from the condenser is throttled and depressurized into a refrigerant in a low temperature and low pressure state; the main control unit adjusts the rotating speed of the compressor, the rotating speed of the fan of the condenser and the proper opening degree of the flow device according to the indoor load and the outdoor temperature T0 or the difference delta T between the indoor temperature T and the outdoor temperature T0 to realize the accurate adjustment of the cooling capacity.
9. The control method of the variable frequency heat pipe composite air conditioning system as claimed in claim 6, wherein when the cold source system operates in the heat pipe circulation mode, the flow device is in a fully open state, throttling and pressure reduction are not performed, heat pipe circulation is completely achieved, and the main control unit determines the rotation speed of the compressor and the rotation speed of the fan of the condenser according to the indoor load and the outdoor temperature T0 or the difference Δ T between the indoor temperature T and the outdoor temperature T0, so as to achieve accurate adjustment of cooling capacity.
10. The control method for the variable-frequency heat pipe type machine room air conditioning system as claimed in claim 6, wherein when the cold source system switches the operation mode, a temperature difference method and a delay control method are adopted for switching; namely the set outdoor temperature deviation deltat 0 and the hold time deltat,
when the outdoor temperature T0 is more than or equal to T2+ delta T0 and the time delta T is maintained, the cold source system is switched to a refrigeration circulation mode;
when the outdoor temperature T2+ delta T0 > T0 > T1-delta T0 and the time delta T is maintained, the cold source system is switched to a transition circulation mode;
when the outdoor temperature T0 is not more than T1-delta T0 and the maintaining time is delta T, the cold source system is switched to a heat pipe circulation mode;
the outdoor temperature deviation Δ T0 and the maintenance time Δ T are set as the case may be.
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