CN111520822A - Method for preventing air conditioning system from freezing and integrated device - Google Patents
Method for preventing air conditioning system from freezing and integrated device Download PDFInfo
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- CN111520822A CN111520822A CN202010356783.2A CN202010356783A CN111520822A CN 111520822 A CN111520822 A CN 111520822A CN 202010356783 A CN202010356783 A CN 202010356783A CN 111520822 A CN111520822 A CN 111520822A
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- air
- temperature
- conditioning system
- air conditioning
- pipeline
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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
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0007—Indoor units, e.g. fan coil units
- F24F1/009—Indoor units, e.g. fan coil units characterised by heating arrangements
- F24F1/0093—Indoor units, e.g. fan coil units characterised by heating arrangements with additional radiant heat-discharging elements, e.g. electric heaters
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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
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0007—Indoor units, e.g. fan coil units
- F24F1/0059—Indoor units, e.g. fan coil units characterised by heat exchangers
- F24F1/0063—Indoor units, e.g. fan coil units characterised by heat exchangers by the mounting or arrangement of the heat exchangers
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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
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0007—Indoor units, e.g. fan coil units
- F24F1/0071—Indoor units, e.g. fan coil units with means for purifying supplied air
- F24F1/0073—Indoor units, e.g. fan coil units with means for purifying supplied air characterised by the mounting or arrangement of filters
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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
- F24F11/41—Defrosting; Preventing freezing
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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
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/02—Ducting arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/24—Means for preventing or suppressing noise
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/28—Arrangement or mounting of filters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/30—Arrangement or mounting of heat-exchangers
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Drying Of Gases (AREA)
Abstract
The invention provides a method for preventing an air conditioning system from freezing, which comprises the following steps: discharging water in a cold water coil and a hot water coil of the air conditioning system; filtering the air at normal temperature and then pressurizing and blowing the air; drying the pressurized air for three times to obtain dry low-temperature air; heating the dry low-temperature air to raise the temperature to obtain high-temperature dry air; and injecting high-temperature dry air into the air conditioning pipeline, and controlling the time for injecting the air according to the residual water amount in the pipeline. The invention also provides an integrated device for preventing the air conditioning system from freezing, which at least comprises a fan, wherein an air filter is arranged in front of the fan, and a compressor, a condenser, an evaporator, a liquid-gas separator, an adsorption tower, a heat exchanger and a heater are sequentially arranged behind the fan. By using the method and the integrated device, residual water in the air-conditioning pipeline and the coil pipe can be removed completely, and the pipeline and the coil pipe are effectively prevented from being frozen after the air-conditioning system is subjected to pressure test flushing in winter.
Description
Technical Field
The invention relates to a method and an integrated device for preventing an air conditioning system from freezing, and belongs to the technical field of air conditioning equipment.
Background
After the construction of the air conditioner pipeline is finished, the pipeline is washed after the pressure test is qualified, or the pipeline is washed simultaneously when the bonding strength test is carried out. Because silt, welding slag or other dirt exists in the pipes in the circulating process of chilled water and cooling water pipelines, the pipes are easily blocked in a condenser of a water chilling unit and a heat exchange pipe bundle of an evaporator in the water circulating process, so that the circulating water is reduced, the refrigerating capacity is insufficient, the refrigerating effect is reduced, and the consequences of incapability of refrigerating, unit operation damage and the like can be caused when the pipes are seriously blocked. When the fan coil system is adopted, the pipe diameter of the heat exchange coil is small and the heat exchange coil is positioned on a branch pipe at the tail end of the air-conditioning water system, the coil is blocked due to the fact that the water flow speed is slow, the equipment cannot exchange heat, and therefore the pipeline must be washed after the pressure test is qualified.
After the air conditioning system is subjected to pressure test washing in winter, if water in the pipeline and the coil pipe is not timely and completely removed, the pipeline and the coil pipe are easily damaged due to icing caused by low-temperature weather in winter. Therefore, after the pressure test is washed, water in the pipeline and the coil pipe must be discharged through the drain valve, but only water is discharged through the drain valve, partial water still can be discharged incompletely and remains in the pipeline and the coil pipe, and once the residual water is frozen, the pipeline and the coil pipe can be damaged, so that the air conditioning equipment is damaged.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides a method and an integrated device for preventing an air conditioning system from freezing, and by using the method and the integrated device, residual water in an air conditioning pipeline and a coil pipe can be removed completely, and the pipeline and the coil pipe are effectively prevented from being frozen after the air conditioning system is subjected to pressure test flushing in winter.
In order to achieve the purpose, the invention adopts the technical scheme that:
a method of preventing freezing of an air conditioning system, comprising the steps of:
s1, discharging water in a cold water coil and a hot water coil of the air conditioning system;
s2, filtering the air at normal temperature to remove impurities contained in the air;
s3, pressurizing and blowing the filtered normal-temperature air, and controlling the flow rate to be not less than 20 m/S;
s4, drying and dehumidifying the pressurized air for three times: firstly, compressing and liquefying the pressurized normal-temperature air and discharging moisture; secondly, the refrigerant and the compressed air are used for heat exchange, the temperature of the compressed air is reduced to the dew point temperature, water contained in the air is condensed into liquid, and the condensed water is removed; thirdly, adsorbing residual moisture in the air by using an adsorbent; thereby producing dry low-temperature air;
s5, heating the dry low-temperature air prepared in the step S4 to obtain high-temperature dry air;
and S6, injecting the high-temperature dry air prepared in the step S5 into an air conditioning pipeline, controlling the air pressure not to exceed the design pressure of the air conditioning system pipeline, controlling the flow rate not to be less than 20m/S, controlling the time for injecting the air according to the residual water quantity in the pipeline, pausing for 1-2 minutes every time when the water is injected for 3-5 minutes, and circularly performing until the residual water in the pipeline is completely removed.
The further improvement of the technical scheme is as follows:
in step S5, the heating and temperature rising of the dry low-temperature air are divided into two steps, firstly, the air is heated to 40-50 ℃ by a heat exchange device; then heating the air to 70-80 ℃ to obtain high-temperature dry air.
In step S4, the adsorbent is activated carbon.
The normal temperature air in step S2 is air at a temperature of 40 ℃.
The technical scheme of the invention also comprises an integrated device for preventing the air conditioning system from freezing, which at least comprises a blower, wherein the blower is a Roots blower, an air filter is arranged in front of the blower, and a compressor, a condenser, an evaporator, a liquid-gas separator, an adsorption tower, a heat exchanger and a heater are sequentially arranged behind the blower; the integrated device for preventing the air conditioning system from freezing is arranged at the inlet of the air conditioning pipeline.
The further improvement of the technical scheme is as follows:
the evaporator is preferably a shell-and-tube evaporator, the liquid-gas separator is preferably a filter screen type liquid-gas separator, and the heat exchanger is preferably a regenerative stainless steel heat exchanger.
The adsorption tower is an activated carbon adsorption tower.
According to the technical scheme, the method for preventing the air conditioning system from freezing comprises the steps of pressurizing air to enable the air to enter the air compression system and be cooled and liquefied, so that liquid in the air is condensed and discharged; the air after primary drying is subjected to heat exchange with a refrigerant, so that after the compressed air is further cooled and liquefied, condensed water is removed, and the secondary drying process of the air is completed; and then, adsorbing residual water in the air completely by the adsorbent to finish the third drying process of the air. The moisture contained in the air can be thoroughly removed through the three drying processes, so that the common air is changed into low-temperature dry air, and the liquid carried by the air per se is prevented from entering an air conditioner pipeline and a coil. And then the low-temperature dried air is heated to raise the temperature, the obtained high-temperature dried air is blown into the air conditioning pipeline and the coil pipe, the pressurized high-temperature dried air can blow out the residual water in the pipeline and the coil pipe, and meanwhile, the residual water on the pipe wall can be quickly dried due to the higher temperature, so that the safety of the air conditioning equipment in winter is ensured. The integrated device for preventing the air conditioning system from freezing adopts the Roots blower to pressurize air, has simple structure and low noise, is not easy to damage, cools the air through the compressor, the condenser, the evaporator, the liquid-gas separator and the adsorption tower to condense liquid in the air, separates the liquid from the air, separates water and oil contained in the air and discharges the separated water and oil to obtain low-temperature dried air, and finally heats the low-temperature dried air by using the heat exchanger and the heater to obtain the high-temperature dried air. The integrated device is arranged at the inlet of the air-conditioning pipeline, and is powered on during use, so that high-temperature dry gas is blown into the air-conditioning pipeline and the coil pipe, residual water in the air-conditioning pipeline and the coil pipe can be removed, and the air-conditioning equipment is prevented from being frozen. The integrated device has the advantages of simple structure, low noise, easy maintenance, low cost and high practicability.
Drawings
FIG. 1 is a flow chart of a method of preventing freezing in an air conditioning system according to the present invention.
Fig. 2 is a schematic structural diagram of an integrated device for preventing an air conditioning system from freezing according to an embodiment of the present invention.
In the figure: 1. the system comprises an air filter, a Roots blower 2, a compressor 3, a condenser 4, an evaporator 5, a liquid-gas separator 6, an adsorption device 7, a heat exchanger 8 and an electric heater 9.
Detailed Description
The invention is further illustrated by the following figures and examples.
As shown in fig. 1, the method for preventing an air conditioning system from freezing provided by this embodiment includes the following specific steps:
s1, discharging water in a cold water coil and a hot water coil of the air conditioning system;
s2, filtering the air at normal temperature of below 40 ℃ to remove impurities contained in the air,
s3, pressurizing and blowing the filtered normal-temperature air, and controlling the flow rate to be not less than 20 m/S;
s4, drying and dehumidifying the pressurized air for three times: firstly, compressing and liquefying the pressurized normal-temperature air and discharging moisture; secondly, the refrigerant and the compressed air are used for heat exchange, the temperature of the compressed air is reduced to the dew point temperature, water contained in the air is condensed into liquid, and the condensed water is removed; thirdly, adsorbing residual moisture in the air by using an activated carbon adsorbent; thereby producing dry low-temperature air;
s5, heating the dry low-temperature air prepared in the step S4, and firstly heating the air to 40-50 ℃ by using a heat exchange device; then heating the air to 70-80 ℃ to obtain high-temperature dry air.
And S6, injecting the high-temperature dry air prepared in the step S5 into an air conditioning pipeline, controlling the air pressure not to exceed the design pressure of the air conditioning system pipeline, controlling the flow rate not to be less than 20m/S, controlling the time for injecting the air according to the residual water amount in the pipeline, stopping the injection for 1-2 minutes after injecting the high-temperature air every 3-5 minutes in order to avoid the damage of the air conditioning pipeline caused by the overlong time for injecting the high-temperature air, and circularly operating until the residual water in the pipeline is removed completely.
As shown in fig. 2, the integrated device for preventing an air conditioning system from freezing provided by this embodiment includes an air filter 1, and a roots blower 2, a compressor 3, a condenser 4, a shell-and-tube evaporator 5, a filter-type liquid-gas separator 6, an activated carbon adsorption tower 7, a heat accumulating type stainless steel heat exchanger 8, and an electric heater 9 are sequentially disposed behind the air filter 1; the integrated device for preventing the air conditioning system from freezing is arranged at the inlet of the air conditioning pipeline. The lower part of the liquid-gas separator is provided with an automatic drainer, the condenser 4 is provided with a cooling device, and the connecting pipeline is provided with a pressure gauge, a throttle valve and a pressure adjusting device.
The working principle of the integrated device of the embodiment is as follows: the normal temperature air is firstly filtered through an air filter, impurities in the air are filtered, then a Roots blower is used for pressurizing the air until the air does not exceed the design pressure of a pipeline of an air conditioning system, the flow rate of the air is controlled to be not less than 20m/s, the air is injected into a compressor, is compressed and liquefied, and discharges water in the air, and then the air is further cooled to the dew point temperature through a condenser, a shell-and-tube evaporator and a stainless steel filter screen type liquid-gas separator, so that water contained in the air is condensed into a liquid state, and the condensed water is removed; and then, the air enters an activated carbon adsorption tower, and residual moisture in the air is adsorbed by the adsorption effect of the activated carbon, so that low-temperature dry air is obtained. And then, heat exchange is carried out on the low-temperature dry air by using a heat accumulating type stainless steel heat exchanger, so that the temperature of the air is raised to 40-50 ℃, and finally, the temperature of the air is raised to 70-80 ℃ by using an electric heater, so that the high-temperature dry air is obtained. The high-temperature dry air is injected into an air conditioning pipeline, and residual water in the pipeline can be removed completely by utilizing the characteristics of high temperature and drying.
The method and the integrated device for preventing the freezing of the air conditioning system are simple and practical, have low investment cost, can effectively remove residual moisture in the air conditioning pipeline, ensure that air blown into the air conditioning pipeline is clean and dry, prevent the air conditioning equipment from being damaged due to the unclean air, and ensure that the air conditioner is not damaged due to freezing after pressure test flushing in winter.
Claims (7)
1. A method of preventing freezing in an air conditioning system, comprising the steps of:
s1, discharging water in a cold water coil and a hot water coil of the air conditioning system;
s2, filtering the air at normal temperature to remove impurities contained in the air;
s3, pressurizing and blowing the filtered normal-temperature air, and controlling the flow rate to be not less than 20 m/S;
s4, drying and dehumidifying the pressurized air for three times: firstly, compressing and liquefying the pressurized normal-temperature air and discharging moisture; secondly, the refrigerant and the compressed air are used for heat exchange, the temperature of the compressed air is reduced to the dew point temperature, water contained in the air is condensed into liquid, and the condensed water is removed; thirdly, adsorbing residual moisture in the air by using an adsorbent; thereby producing dry low-temperature air;
s5, heating the dry low-temperature air prepared in the step S4 to obtain high-temperature dry air;
and S6, injecting the high-temperature dry air prepared in the step S5 into an air conditioning pipeline, controlling the air pressure not to exceed the design pressure of the air conditioning system pipeline, controlling the flow rate not to be less than 20m/S, controlling the time for injecting the air according to the residual water quantity in the pipeline, pausing for 1-2 minutes every time when the water is injected for 3-5 minutes, and circularly performing until the residual water in the pipeline is completely removed.
2. A method of preventing freezing of an air conditioning system according to claim 1, wherein: in step S5, the heating and temperature rising of the dry low-temperature air are divided into two steps, firstly, the air is heated to 40-50 ℃ by a heat exchange device; then heating the air to 70-80 ℃ to obtain high-temperature dry air.
3. A method of preventing freezing of an air conditioning system according to claim 1, wherein: in step S4, the adsorbent is activated carbon.
4. A method of preventing freezing of an air conditioning system according to claim 1, wherein: the normal temperature air in step S2 is air at a temperature of 40 ℃.
5. The integrated device for preventing the freezing of the air conditioning system, which is manufactured by the method for preventing the freezing of the air conditioning system according to claim 1, at least comprises a fan, and is characterized in that: the air blower is a Roots air blower, an air filter is arranged in front of the air blower, and a compressor, a condenser, an evaporator, a liquid-gas separator, an adsorption tower, a heat exchanger and a heater are sequentially arranged behind the air blower; the integrated device for preventing the air conditioning system from freezing is arranged at the inlet of the air conditioning pipeline.
6. An integrated unit for preventing freezing of an air conditioning system according to claim 5, wherein: the evaporator is preferably a shell-and-tube evaporator, the liquid-gas separator is preferably a filter screen type liquid-gas separator, and the heat exchanger is preferably a regenerative stainless steel heat exchanger.
7. An integrated unit for preventing freezing of an air conditioning system according to claim 6, wherein: the adsorption tower is an activated carbon adsorption tower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010356783.2A CN111520822A (en) | 2020-04-29 | 2020-04-29 | Method for preventing air conditioning system from freezing and integrated device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010356783.2A CN111520822A (en) | 2020-04-29 | 2020-04-29 | Method for preventing air conditioning system from freezing and integrated device |
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| Publication Number | Publication Date |
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| CN111520822A true CN111520822A (en) | 2020-08-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010356783.2A Pending CN111520822A (en) | 2020-04-29 | 2020-04-29 | Method for preventing air conditioning system from freezing and integrated device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112161508A (en) * | 2020-09-24 | 2021-01-01 | 上汽通用五菱汽车股份有限公司 | Coil purging method, coil purging system and readable storage medium |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2139239Y (en) * | 1992-11-10 | 1993-07-28 | 魏昆山 | Closed circulation type heat recovery dehumidifier |
| JP2006068727A (en) * | 2004-08-04 | 2006-03-16 | Kitano Construction Corp | Dehumidifying apparatus |
| CN201848196U (en) * | 2010-05-18 | 2011-06-01 | 杭州科林爱尔气源设备有限公司 | Unpowered moisture drier |
| CN108786390A (en) * | 2018-07-17 | 2018-11-13 | 中国工程物理研究院核物理与化学研究所 | Reactor plant compressed air dehumidifying device and dehumanization method |
| CN209612577U (en) * | 2018-11-27 | 2019-11-12 | 济南华盛档案设备有限责任公司 | A kind of frost formula air compression drying device |
-
2020
- 2020-04-29 CN CN202010356783.2A patent/CN111520822A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2139239Y (en) * | 1992-11-10 | 1993-07-28 | 魏昆山 | Closed circulation type heat recovery dehumidifier |
| JP2006068727A (en) * | 2004-08-04 | 2006-03-16 | Kitano Construction Corp | Dehumidifying apparatus |
| CN201848196U (en) * | 2010-05-18 | 2011-06-01 | 杭州科林爱尔气源设备有限公司 | Unpowered moisture drier |
| CN108786390A (en) * | 2018-07-17 | 2018-11-13 | 中国工程物理研究院核物理与化学研究所 | Reactor plant compressed air dehumidifying device and dehumanization method |
| CN209612577U (en) * | 2018-11-27 | 2019-11-12 | 济南华盛档案设备有限责任公司 | A kind of frost formula air compression drying device |
Non-Patent Citations (1)
| Title |
|---|
| 杜伟国: "《管道施工技术》", 30 June 2001, 上海科学技术出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112161508A (en) * | 2020-09-24 | 2021-01-01 | 上汽通用五菱汽车股份有限公司 | Coil purging method, coil purging system and readable storage medium |
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Application publication date: 20200811 |
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