CN108006870A - A kind of compound computer-room air conditioning system of air pump and its control method - Google Patents
A kind of compound computer-room air conditioning system of air pump and its control method Download PDFInfo
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- CN108006870A CN108006870A CN201810040780.0A CN201810040780A CN108006870A CN 108006870 A CN108006870 A CN 108006870A CN 201810040780 A CN201810040780 A CN 201810040780A CN 108006870 A CN108006870 A CN 108006870A
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 27
- 150000001875 compounds Chemical class 0.000 title claims abstract description 7
- 238000005057 refrigeration Methods 0.000 claims abstract description 64
- 239000007788 liquid Substances 0.000 claims abstract description 20
- 238000001816 cooling Methods 0.000 claims abstract description 7
- 239000002131 composite material Substances 0.000 claims description 30
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 2
- 238000007906 compression Methods 0.000 abstract description 9
- 230000006835 compression Effects 0.000 abstract description 7
- 239000003921 oil Substances 0.000 description 21
- 238000010586 diagram Methods 0.000 description 9
- 238000005265 energy consumption Methods 0.000 description 5
- 238000001704 evaporation Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 239000010687 lubricating oil Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000010726 refrigerant oil Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
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- Mechanical Engineering (AREA)
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- Combustion & Propulsion (AREA)
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- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a kind of compound computer-room air conditioning system of air pump, cold source system, main control unit and the temperature collecting cell formed including compressor, air pump, oil eliminator, condenser, flow apparatus, evaporator and gas-liquid separator, main control unit are connected with cold source system signal；Temperature collecting cell is used to gather outdoor temperature and indoor temperature and be connected with main control unit signal, makes operating status of the main control unit according to indoor and outdoor temperature control compressor, air pump, the wind turbine of condenser and flow apparatus.The invention also discloses a kind of control method of the compound computer-room air conditioning system of air pump, can be according to outdoor temperature, adjust compressor, the operating status of air pump, the on off state of throttling arrangement and the operating status of condenser, cold source system is set to be switched to kind of refrigeration cycle pattern or gas pump cycle pattern respectively, realize and substitute compression kind of refrigeration cycle pattern using gas pump cycle pattern using outdoor natural cooling source in low temperature season, can maximumlly utilize natural cooling source.
Description
Technical Field
The invention relates to an air pump 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 is switched between the refrigeration mode and the heat pipe mode, the cold output of the system is unstable, and the system is excessively unstable.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an air pump 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: an air pump composite type machine room air conditioning system comprises a cold source system, a main control unit and a temperature acquisition unit; wherein,
the cold source system comprises a compressor, an air pump, an oil separator, a condenser, 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, and the exhaust port of each compressor is respectively connected with the inlet of a first one-way valve;
the air pump is composed of one or more air pumps which are connected in parallel and are provided with an air outlet and an air suction port, and the air outlet of each air pump is respectively connected with the inlet of a second one-way valve;
the inlet of the oil separator is communicated with the outlets of the first one-way valve and the second one-way valve, and the oil return port of the oil separator is communicated with the air suction port of the compressor and the air suction port of the air pump through an oil return capillary tube;
the inlet of the condenser is communicated with the outlet of the oil separator;
the inlet of the flow device is communicated with the outlet of the condenser, 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;
and the inlet of the gas-liquid separator is communicated with the outlet of the evaporator.
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 air pump, the fan of the condenser and the flow device according to the indoor temperature and the outdoor temperature.
The air pump composite type machine room air conditioning system comprises a condenser, a flow device, a cold source system, a liquid storage device, a drying filter and a liquid sight glass, wherein the condenser is arranged on the cold source system, and the flow device is arranged on the cold source system.
In the air pump composite type air conditioning system for the machine room, the condenser is an air-cooled condenser, a water-cooled condenser or an evaporative condenser.
In the air pump composite type air conditioning system for the machine room, 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 in parallel with the electromagnetic valve, or the electric flow regulating valve is connected in parallel with the electronic expansion valve.
The other technical scheme for realizing the purpose of the invention is as follows: a control method of an air pump hybrid type machine room air conditioning system based on claim 1, comprising:
the outdoor temperature T is divided into two functional zones: a refrigeration area and an air pump area;
the refrigeration area is as follows: the outdoor temperature T is more than T0; the air pump area is: the outdoor temperature T is less than or equal to T0;
wherein, T0 should be set according to specific working conditions;
aiming at different functional areas where the outdoor temperature T is located, the cold source system is correspondingly switched to operate in a refrigeration circulation mode or an air pump circulation mode:
and the refrigeration circulation mode corresponding to the refrigeration area is as follows: a refrigeration working medium loop is formed by a compressor, a first one-way valve, an oil separator, a condenser, a flow device, an evaporator and a gas-liquid separator;
and the air pump circulation mode corresponding to the air pump area is as follows: the air pump, the second one-way valve, the oil separator, the condenser, the flow device, the evaporator and the gas-liquid separator form a refrigerating working medium loop.
According to the control method of the air pump composite type machine room air conditioning system, when the cold source system operates in the refrigeration cycle mode, the flow device performs throttling depressurization on the refrigeration working medium for the throttling device, and the rotating speed of the compressor, the opening of the flow device and the rotating speed of the fan of the condenser are determined according to the indoor load and the outdoor temperature T so as to realize accurate adjustment of the cooling capacity.
According to the control method of the air pump composite type machine room air conditioning system, when the cold source system operates in the air pump circulation mode, the flow device is fully opened, and the rotating speed of the air pump and the rotating speed of the fan of the condenser are determined according to the indoor load and the outdoor temperature T so as to realize accurate adjustment of the cold quantity.
In the control method of the air pump composite 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, that is, an outdoor temperature deviation Δ T0 and a maintaining time Δ T are set;
when the outdoor temperature T0+ delta T0 is more than or equal to T which is more than or equal to T0-delta T0, the cold source system maintains the current operation mode;
when the outdoor temperature T is more than T0+ delta T0 and the maintaining time is delta T, the cold source system is switched to a refrigeration circulation mode;
when the outdoor temperature T is less than or equal to T0-delta T0 and the maintaining time is delta T, the cold source system is switched to an air pump circulation mode;
the temperature deviation Δ T0 and the holding time Δ T should be set as the case may be.
According to the air pump composite type machine room air conditioning system and the control method thereof, the running states of the compressor and the air pump, the switching state of the throttling device and the running state of the condenser can be adjusted according to the outdoor temperature, so that the cold source system is respectively switched into the refrigeration cycle mode or the air pump cycle mode, the air pump cycle mode is used for replacing the compression refrigeration cycle mode by utilizing an outdoor natural cold source in low-temperature seasons, the unit cost of the existing composite type air conditioning system is reduced, the system structure is simplified, and the maintenance difficulty is reduced; 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 structure of an air pump composite type machine room air conditioning system of the present invention;
fig. 2 is another structural schematic diagram of the air pump composite type machine room air conditioning system of the present invention;
fig. 3 is a schematic diagram of a control method of the air pump composite type machine room air conditioning system of the present invention;
fig. 4 is a schematic diagram of the air pump composite type machine room air conditioning system of the present invention operating in a refrigeration cycle mode;
fig. 5 is a pressure-enthalpy diagram of the air pump composite type machine room air conditioning system of the present invention operating in the refrigeration cycle mode;
fig. 6 is a schematic diagram of the air pump composite type machine room air conditioning system of the present invention operating in an air pump circulation mode;
fig. 7 is a pressure-enthalpy diagram of the air pump composite type machine room air conditioning system of the present invention operating in the air pump circulation mode.
Detailed Description
The invention will be further explained with reference to the drawings.
Referring to fig. 1 to 7, an air pump composite type air conditioning system for a machine room according to the present invention includes a cold source system, a main control unit and a temperature control device, wherein:
the cold source system comprises a compressor 1, an air pump 2, an oil separator 4, a condenser 5, a flow device, an evaporator 7 and a gas-liquid separator 8, wherein:
the compressor 1 is composed of one or more compressors which are connected in parallel and provided with an exhaust port and an air suction port, and the compressor 1 can be internally arranged or externally arranged according to specific working conditions; the exhaust port of each compressor 1 is connected with the inlet of a first one-way valve 31;
the air pump 2 is composed of one or more air pumps which are connected in parallel and are provided with an air outlet and an air inlet, and the air pump 2 can be internally arranged or externally arranged according to specific working conditions; the exhaust port of each air pump 2 is connected with the inlet of a second one-way valve 32;
the inlet of the oil separator 4 is communicated with the outlets of the first check valve 31 and the second check valve 32, and the oil return port of the oil separator 4 is communicated with the air suction port of the compressor 1 and the air suction port of the air pump 2 through an oil return capillary tube 40;
the inlet of the condenser 5 is communicated with the outlet of the oil separator 4; the condenser 5 is an air-cooled condenser, a water-cooled condenser or an evaporative condenser;
the inlet of the flow device 6 is communicated with the outlet of the condenser 5, the flow device 6 has the function of adjusting the flow in a wide range, and is a single electronic expansion valve, or two electronic expansion valves are connected in parallel, or the electronic expansion valve is connected in parallel with an electromagnetic valve, or an electric flow adjusting valve is connected in parallel with the electronic expansion valve; the flow device 6 of the present embodiment is a single electronic expansion valve (see fig. 1);
the inlet of the evaporator 7 is communicated with the outlet of the flow device 6;
the inlet of the gas-liquid separator 8 is communicated with the outlet of the evaporator 7;
the main control unit is respectively in signal connection with the cold source system and the temperature acquisition unit;
the temperature acquisition unit is used for acquiring outdoor temperature and indoor temperature, so that the main control unit controls the running states of the fan of the compressor 1, the air pump 2 and the condenser 5 and the flow device 6 according to the indoor temperature and the outdoor temperature.
In another embodiment, the flow device 6 is an electronic expansion valve 62 and a solenoid valve 61 (see fig. 2) connected in parallel.
The air pump composite type machine room air conditioning system can effectively utilize an outdoor cold source, is efficient and energy-saving, and is high in reliability.
The control method based on the air pump composite type machine room air conditioning system 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 T is divided into two functional zones: a refrigeration area and an air pump area;
the refrigerating area is as follows: the outdoor temperature T is more than T0;
the air pump area is: the outdoor temperature T is less than or equal to T0;
wherein, T0 should be set according to specific working conditions;
and correspondingly switching the cold source system to operate in a refrigeration circulation mode or an air pump circulation mode aiming at different functional areas where the outdoor temperature T is positioned.
Refrigeration circulation modes corresponding to the refrigeration areas are as follows: a refrigeration working medium loop is formed by the compressor 1, the first one-way valve 31, the oil separator 4, the condenser 5, the flow device 6, the evaporator 7 and the gas-liquid separator 8, at the moment, the flow device 6 is a throttling device, throttling and pressure reduction are carried out on the refrigeration working medium, and the rotating speed of the compressor 1, the opening of the flow device 6 and the rotating speed of a fan of the condenser 5 are determined according to the indoor load and the outdoor temperature T to realize accurate adjustment of refrigeration capacity;
air pump circulation mode that the air pump district corresponds: the air pump 2, the second one-way valve 32, the oil separator 4, the condenser 5, the flow device 6, the evaporator 7 and the gas-liquid separator 8 form a refrigeration working medium loop, at the moment, the flow device 6 is in a fully open state, throttling and pressure reduction are not carried out, gas-phase heat pipe circulation is completely realized, and the rotating speed of the air pump 2 and the rotating speed of a fan of the condenser 5 are determined according to the indoor load and the outdoor temperature T to realize accurate adjustment of cooling capacity (see fig. 3).
When the outdoor temperature meets T & gt T0, the cold source system operates a refrigeration circulation mode, the main control unit controls the air pump 2 to stop working at the moment, the compressor 1, the first one-way valve 31, the oil separator 4, the condenser 5, the throttling device 6, the evaporator 7 and the gas-liquid separator 8 form a refrigeration working medium loop, the main control unit controls the flow device 6 to be the throttling device, namely, the electronic expansion valve 62 works, the electromagnetic valve 61 is closed, the rotating speed of the compressor 1, the opening degree of the electronic expansion valve 62 and the rotating speed of a fan of the condenser 5 are determined according to the indoor load and the outdoor temperature T, and accurate adjustment of refrigeration capacity is achieved. Low-temperature low-pressure refrigeration working medium steam is compressed into high-temperature high-pressure steam by a compressor 1, is cooled into liquid working medium after being released and condensed by a condenser 5, enters a throttling device 6, is throttled and depressurized by an electronic expansion valve 62, then is subjected to heat absorption and evaporation in an evaporator 7, and returns to an air suction port of the compressor 1 through a gas-liquid separator 8 to complete refrigeration cycle (see fig. 4); as shown in fig. 5, 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 7, the working medium enters the compressor 1 to perform the 1-2 compression process. The mixture of refrigerant and lubricating oil enters the oil separator 4, wherein the majority of the lubricating oil is returned to the compressor 1 via the oil return capillary 40. The vapor discharged from the compressor 1 does not flow backward into the air pump 2 due to the second check valve 32.
When the outdoor temperature is higher, the compressor 1 performs mechanical refrigeration to achieve an efficient refrigeration effect.
When the outdoor temperature meets T < T0, in order to realize the energy-saving effect, the cold source system operates the air pump circulation mode, at the moment, the main control unit controls the compressor 1 to stop working, an air refrigeration working medium loop is formed by the air pump 2, the second one-way valve 32, the oil separator 4, the condenser 5, the throttling device 6, the evaporator 7 and the air-liquid separator 8, and refrigeration is realized by directly evaporating refrigeration working medium in the evaporator 7 (see figure 6); at this time, the main control unit controls the flow device 6 to be in a full open state, namely, the electromagnetic valve 61 works, the electronic expansion valve 62 is closed, and the rotating speed of the air pump 2 and the rotating speed of the fan of the condenser 5 are determined according to the indoor load and the outdoor temperature T, so that the accurate adjustment of the cooling capacity is realized. As shown in fig. 7, the pressure-enthalpy diagram of the air pump circulation mode is shown.
And setting T0 as 12 ℃ for a 38 ℃ constant temperature machine room, wherein when T is less than or equal to 12 ℃, the cold source system operates in an air pump circulation mode, and when T is more than 12, the cold source system operates in a refrigeration circulation mode.
When the cold source system switches the operation mode, a temperature difference method and a delay control method can be adopted for switching, namely, the outdoor temperature deviation delta T0 and the maintaining time delta T are set;
when the outdoor temperature T0+ delta T0 is more than or equal to T which is more than or equal to T0-delta T0, the cold source system maintains the current operation mode;
when the outdoor temperature T is more than or equal to T0+ delta T0 and the maintaining time is delta T, the cold source system is switched to a refrigeration circulation mode;
when the outdoor temperature T is less than or equal to T0-delta T0 and the maintaining time is delta T, the cold source system is switched to an air pump circulation mode;
the temperature deviation Δ T0 and the holding time Δ T should be set as the case may be.
Aiming at a constant temperature machine room at 38 ℃, if T0 is set to be 12 ℃, delta T0 is set to be 2 ℃ and delta T is set to be 5 minutes, when the outdoor temperature T is less than or equal to 10 ℃ and is maintained for 5 minutes, the cold source system operates in an air pump circulation mode; when the outdoor temperature T is more than or equal to 14 ℃ and is maintained for 5 minutes, the cold source system operates in a refrigeration cycle mode.
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 (8)
1. An air pump 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 air pump, an oil separator, a condenser, 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, and the exhaust port of each compressor is respectively connected with the inlet of a first one-way valve;
the air pump is composed of one or more air pumps which are connected in parallel and are provided with an air outlet and an air suction port, and the air outlet of each air pump is respectively connected with the inlet of a second one-way valve;
the inlet of the oil separator is communicated with the outlets of the first one-way valve and the second one-way valve, and the oil return port of the oil separator is communicated with the air suction port of the compressor and the air suction port of the air pump through an oil return capillary tube;
the inlet of the condenser is communicated with the outlet of the oil separator;
the inlet of the flow device is communicated with the outlet of the condenser, 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;
and the inlet of the gas-liquid separator is communicated with the outlet of the evaporator.
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 air pump, the fan of the condenser and the flow device according to the indoor temperature and the outdoor temperature.
2. The air pump composite type machine room air conditioning system according to claim 1, wherein the cold source system further comprises a liquid reservoir, a dry filter and a sight glass which are sequentially connected between the condenser and the flow device.
3. The air pump compound type machine room 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 air pump composite type air conditioning system for machine room of 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. A control method of an air pump composite type machine room air conditioning system based on claim 1,
the outdoor temperature T is divided into two functional zones: a refrigeration area and an air pump area;
the refrigeration area is as follows: the outdoor temperature T is more than T0; the air pump area is: the outdoor temperature T is less than or equal to T0;
wherein, T0 should be set according to specific working conditions;
aiming at different functional areas where the outdoor temperature T is located, the cold source system is correspondingly switched to operate in a refrigeration circulation mode or an air pump circulation mode:
and the refrigeration circulation mode corresponding to the refrigeration area is as follows: a refrigeration working medium loop is formed by a compressor, a first one-way valve, an oil separator, a condenser, a flow device, an evaporator and a gas-liquid separator;
and the air pump circulation mode corresponding to the air pump area is as follows: the air pump, the second one-way valve, the oil separator, the condenser, the flow device, the evaporator and the gas-liquid separator form a refrigerating working medium loop.
6. The control method of the air pump composite type machine room air conditioning system according to claim 5, wherein when the cold source system operates in a refrigeration cycle mode, the flow device throttles and depressurizes the refrigeration working medium for the throttling device, and the rotation speed of the compressor, the opening degree of the flow device and the rotation speed of the fan of the condenser are determined according to the indoor load and the outdoor temperature T to realize accurate adjustment of the refrigeration capacity.
7. The control method of the air pump compound type machine room air conditioning system according to claim 5, wherein when the cold source system operates in the air pump circulation mode, the flow device is fully opened, and the rotation speed of the air pump and the rotation speed of the fan of the condenser are determined according to the indoor load and the outdoor temperature T to realize accurate adjustment of the cooling capacity.
8. The control method of the air pump composite type machine room air conditioning system according to claim 5, wherein when the cold source system switches the operation mode, a temperature difference method and a time delay control method are adopted for switching, namely, an outdoor temperature deviation Δ T0 and a maintaining time Δ T are set;
when the outdoor temperature T0+ delta T0 is more than or equal to T which is more than or equal to T0-delta T0, the cold source system maintains the current operation mode;
when the outdoor temperature T is more than T0+ delta T0 and the maintaining time is delta T, the cold source system is switched to a refrigeration circulation mode;
when the outdoor temperature T is less than or equal to T0-delta T0 and the maintaining time is delta T, the cold source system is switched to an air pump circulation mode;
the temperature deviation Δ T0 and the holding time Δ T should be set as the case may be.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810040780.0A CN108006870A (en) | 2018-01-16 | 2018-01-16 | A kind of compound computer-room air conditioning system of air pump and its control method |
Applications Claiming Priority (1)
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| CN112351651A (en) * | 2020-10-30 | 2021-02-09 | 中国移动通信集团设计院有限公司 | Condenser, air conditioner special for air cooling machine room and control method of air conditioner special for air cooling machine room |
| CN112682910A (en) * | 2020-12-08 | 2021-04-20 | 珠海格力电器股份有限公司 | Method and system for switching operation modes of dual-power cooling system |
| CN113531862A (en) * | 2021-06-30 | 2021-10-22 | 苏州英维克温控技术有限公司 | Variable-frequency fluorine pump air conditioner control method and device, electronic equipment and medium |
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| CN114165893A (en) * | 2021-11-30 | 2022-03-11 | 珠海格力电器股份有限公司 | Control device and method of machine room refrigerating system and machine room refrigerating system |
| CN114216277A (en) * | 2021-12-08 | 2022-03-22 | 珠海格力电器股份有限公司 | Cabinet air conditioner and control method thereof |
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| CN108758912A (en) * | 2018-06-21 | 2018-11-06 | 北京百度网讯科技有限公司 | The cooling handpiece Water Chilling Units of evaporation |
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| CN114110975A (en) * | 2021-11-11 | 2022-03-01 | 珠海格力电器股份有限公司 | Control method and device of air conditioner, storage medium and air conditioner |
| CN114165893A (en) * | 2021-11-30 | 2022-03-11 | 珠海格力电器股份有限公司 | Control device and method of machine room refrigerating system and machine room refrigerating system |
| CN114216277A (en) * | 2021-12-08 | 2022-03-22 | 珠海格力电器股份有限公司 | Cabinet air conditioner and control method thereof |
| CN114251858A (en) * | 2021-12-20 | 2022-03-29 | 珠海格力电器股份有限公司 | Air conditioning system and control method thereof |
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Application publication date: 20180508 |