CN114128623B - Accurate ventilation system utilizing heat pump and ventilation pipe in pig house and operation method - Google Patents
Accurate ventilation system utilizing heat pump and ventilation pipe in pig house and operation method Download PDFInfo
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- 238000009423 ventilation Methods 0.000 title claims abstract description 122
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- 238000001816 cooling Methods 0.000 claims abstract description 13
- 238000001914 filtration Methods 0.000 claims description 15
- 238000005057 refrigeration Methods 0.000 claims description 12
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- 239000007921 spray Substances 0.000 description 2
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- 244000144972 livestock Species 0.000 description 1
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K1/00—Housing animals; Equipment therefor
- A01K1/0047—Air-conditioning, e.g. ventilation, of animal housings
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K1/00—Housing animals; Equipment therefor
- A01K1/0047—Air-conditioning, e.g. ventilation, of animal housings
- A01K1/0052—Arrangement of fans or blowers
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K1/00—Housing animals; Equipment therefor
- A01K1/0047—Air-conditioning, e.g. ventilation, of animal housings
- A01K1/0076—Arrangement of heaters or heat exchangers
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
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Abstract
The invention discloses a precise ventilation system and an operation method for utilizing a heat pump and a ventilation pipe in a pig house; the system uses the heat pump as a power source for cooling and heating in the pig house, and is matched with the ventilation pipe to supply air to the pig house accurately, the humidity can be reduced while the temperature is controlled in summer through the ventilation strategy at different temperatures, the pig house can be heated with lower cost in winter, the ventilation energy consumption is reduced, the comfort of the pig house environment is greatly improved, and the production performance is improved.
Description
Technical Field
The invention belongs to the technical field of livestock breeding facilities, and particularly relates to a precise ventilation system and an operation method for utilizing a heat pump and a ventilation pipe in a pig house.
Background
Good environmental control is very important for the performance of sow and boar production. The developed nations mainly raising pigs abroad are relatively easy to control the environment because the climate conditions are suitable. The temperature difference between winter and summer is large in most areas of China, and the temperature and the humidity exist simultaneously in summer, so that the environment is relatively difficult to control. In summer, even if means such as tunnel ventilation, wet curtain cooling, spray cooling and the like are used, the problems of high temperature and high humidity cannot be solved simultaneously in summer (namely, the relative humidity is greatly improved while the wet curtain and the spray can be cooled by evaporation); in winter, the natural gas price in China is high, and the running cost of the existing gas heating equipment is also high.
Therefore, a pig house operation system and an operation method which are low in cost and capable of simultaneously reducing temperature and eliminating dampness are lacking in China.
Disclosure of Invention
The invention aims to provide a precise ventilation system and an operation method by utilizing a heat pump and a ventilation pipe in a pig house; the system uses the heat pump as a power source for cooling and heating in the pig house, and is matched with the ventilation pipe to supply air accurately in the pig house, and through the ventilation strategies at different temperatures, the humidity can be reduced while the temperature is controlled in summer, the pig house can be heated with lower cost in winter, the ventilation energy consumption is reduced, the comfort level of the pig house environment is greatly improved, and the production performance is improved.
The invention can be realized by the following first technical scheme:
the accurate ventilation system comprises a first basic air inlet pipe, a second basic air inlet pipe and a supplementary air inlet pipe, wherein the first basic air inlet pipe, the second basic air inlet pipe and the supplementary air inlet pipe are arranged in parallel along the length direction of the pig house, and the supplementary air inlet pipe is positioned between the first basic air inlet pipe and the second basic air inlet pipe; an air outlet is arranged on one wall of the pigsty; a first basic air inlet pipe positive pressure fan and a first heat pump system internal surface cooler are sequentially arranged in the air inlet end of the first basic air inlet pipe; a second basic air inlet pipe positive pressure fan and a second heat pump system internal surface cooler are sequentially arranged in the air inlet end of the second basic air inlet pipe; a positive pressure fan of the supplementary air inlet pipe is arranged in the air inlet end of the supplementary air inlet pipe; the internal surface cooler of the first heat pump system and the internal surface cooler of the second heat pump system are connected in series with the heat pump system host through pipelines.
Further preferably, the walls of the first basic air inlet pipe, the second basic air inlet pipe and the supplementary air inlet pipe are provided with a plurality of air inlets; and the heat pump system host is connected with an external surface cooler.
The accurate ventilation operation method using the heat pump and the ventilation pipe in the pig house applied in the system is divided into four operation modes of heating, minimum ventilation, maximum ventilation and refrigeration, and the corresponding temperature set points are respectively as follows: a lowest set value, a second set value and a highest set value.
Heating mode: when the temperature in the pig house is lower than the lowest set value, the positive pressure fans of the first and second basic air inlet pipes are opened, the positive pressure fans of the supplementary air inlet pipes are closed, the main machine of the heat pump system heats, outdoor air is respectively heated by the surface coolers in the first and second heat pump systems and then is driven by the positive pressure fans of the first and second basic air inlet pipes to enter the first and second basic air inlet pipes, then the air enters the pig house uniformly through the respective air inlets, and the air in the pig house is discharged from the air outlet through the generated pressure.
Minimum ventilation mode: when the temperature in the pigsty reaches the lowest set value and is lower than the second set value, the heat pump system host stops working, the first basic air inlet pipe positive pressure fan and the second basic air inlet pipe positive pressure fan continuously work, and the supplementary air inlet pipe positive pressure fan is kept closed; if the temperature continues to rise to the second set value, entering a maximum ventilation mode; if the temperature is reduced, the heating mode is returned to when the temperature is reduced to be lower than the lowest set value of 0.5 ℃.
Maximum ventilation mode: when the temperature in the pig house exceeds a second set value and is lower than a highest set value, the positive pressure fans of the first basic air inlet pipe and the second basic air inlet pipe and the positive pressure fans of the supplementary air inlet pipe are simultaneously started, the first basic air inlet pipe and the second basic air inlet pipe simultaneously ventilate the pig house, the air inlet quantity is increased, the opening degree of the air outlet is increased, more air is discharged, and the pressure in the pig house is balanced; when the temperature continues to rise to the highest set value, entering a refrigeration mode; if the temperature falls, the temperature returns to the minimum ventilation mode when the temperature falls below the second set value of 0.5 ℃.
Cooling mode: when the temperature in the pig house reaches the highest set value, the positive pressure fans of the first and second basic air inlet pipes are kept on, the positive pressure fans of the supplementary air inlet pipes are closed, the main machine of the heat pump system is started to be in a refrigerating state, outdoor air is respectively cooled by the surface coolers in the first and second heat pump systems and then is driven by the positive pressure fans of the first and second basic air inlet pipes to enter the first and second basic air inlet pipes, and then the air is uniformly introduced into the pig house through respective air inlets to cool the pig house, and meanwhile, the air in the pig house is discharged through the air outlets; if the temperature drops, the mode returns to the maximum ventilation mode when the temperature drops to 0.5 ℃ below the maximum set value.
The invention can be realized by the following second technical scheme:
the accurate ventilation system comprises a first basic air inlet pipe, a second basic air inlet pipe and a supplementary air inlet pipe, wherein the first basic air inlet pipe, the second basic air inlet pipe and the supplementary air inlet pipe are arranged in parallel along the length direction of the pig house, and the supplementary air inlet pipe is positioned between the first basic air inlet pipe and the second basic air inlet pipe; the first basic air inlet pipe is connected with a tube side air outlet of the first heat exchange device through a first middle pipeline, a surface cooler in the first heat pump system is arranged in the first middle pipeline, a positive pressure fan of the first basic air inlet pipe is arranged in an air inlet end of a tube side air inlet of the first heat exchange device, a shell side air inlet of the first heat exchange device is used as a first air return opening positioned in a pig house, and a shell side air outlet of the first heat exchange device is used as a first air outlet of the pig house; the second basic air inlet pipe is connected with a tube side air outlet of the second heat exchange device through a second middle pipeline, a surface cooler in the second heat pump system is arranged in the second middle pipeline, a positive pressure fan of the second basic air inlet pipe is arranged in an air inlet end of a tube side air inlet of the second heat exchange device, a shell side air inlet of the second heat exchange device is used as a second air return opening positioned in a pig house, and a shell side air outlet of the second heat exchange device is used as a second air outlet of the pig house; a positive pressure fan of the supplementary air inlet pipe is arranged in the air inlet end of the supplementary air inlet pipe; and the surface coolers inside the first heat pump system and the second heat pump system are respectively connected with a heat pump system host.
Further preferably, the walls of the first basic air inlet pipe, the second basic air inlet pipe and the supplementary air inlet pipe are provided with a plurality of air inlets; and the heat pump system host is connected with an external surface cooler.
Further preferably, dust removal and filtration devices are arranged in the first air return port and the second air return port; dust removal filter devices are arranged in front of the first basic air inlet pipe positive pressure fan and the second basic air inlet pipe positive pressure fan.
The accurate ventilation operation method using the heat pump and the ventilation pipe in the pig house is divided into four operation modes of heating, minimum ventilation, maximum ventilation and refrigeration, and the corresponding temperature set points are respectively as follows: a lowest set value, a second set value and a highest set value.
Heating mode: when the temperature in the pigsty is lower than the lowest set value, the positive pressure fans of the first and second basic air inlet pipes are turned on, the positive pressure fans of the supplementary air inlet pipes are turned off, and the main machine of the heat pump system heats; the filtered outdoor air is driven by the positive pressure fans of the first basic air inlet pipe and the second basic air inlet pipe respectively, enters through the first heat exchange device and the second heat exchange device, enters the first basic air inlet pipe and the second basic air inlet pipe after being heated by the surface coolers in the first heat pump system and the second heat pump system respectively, uniformly enters the pig house through the respective air inlets, and discharges the air in the pig house through the first air return inlet and the second air return inlet respectively through the first heat exchange device and the second heat exchange device and through the first air outlet and the second air outlet respectively through the generated pressure.
Minimum ventilation mode: when the temperature in the pigsty reaches the lowest set value and is lower than the second set value, the heat pump system host stops working, the first basic air inlet pipe positive pressure fan and the second basic air inlet pipe positive pressure fan continuously work, and the supplementary air inlet pipe positive pressure fan is kept closed; if the temperature continues to rise below the second set value, entering a maximum ventilation mode; if the temperature is reduced, the heating mode is returned to when the temperature is reduced to be lower than the lowest set value of 0.5 ℃.
Maximum ventilation mode: when the temperature in the pig house exceeds a second set value and is lower than a highest set value, the positive pressure fans of the first basic air inlet pipe and the second basic air inlet pipe and the positive pressure fans of the supplementary air inlet pipe are simultaneously started, the first basic air inlet pipe and the supplementary air inlet pipe simultaneously ventilate the pig house, the air inlet quantity is increased, the opening degree of the first air outlet and the second air outlet is increased, more air in the pig house is discharged, and the pressure in the pig house is balanced; when the temperature continues to rise to the highest set value, entering a refrigeration mode; if the temperature falls, the temperature returns to the minimum ventilation mode when the temperature falls below the second set value of 0.5 ℃.
Cooling mode: when the temperature in the pig house reaches the highest set value, the positive pressure fans of the first and second basic air inlet pipes are kept on, the positive pressure fans of the supplementary air inlet pipes are turned off, and meanwhile, the main machine of the heat pump system is started to be in a refrigerating state, and outdoor air enters the pig house after being cooled by the surface coolers in the first and second heat pump systems respectively, so that the temperature in the pig house is reduced; if the temperature drops, the mode returns to the maximum ventilation mode when the temperature drops to 0.5 ℃ below the maximum set value.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention uses the heat pump to regulate the temperature, provides more comfortable environment for pigs, especially in summer with high temperature and high humidity, can control the indoor temperature below 26 ℃ and the relative temperature to be about 60 percent, and can greatly improve the production performance (PSY for sows and semen quality and quantity for boars).
2. When the air temperature is highest, the temperature is regulated by using the minimum ventilation quantity, and when the temperature is proper, the ventilation quantity is increased to take away redundant heat, moisture and harmful gas, so that the operation cost is more optimized.
3. The heat pump is used for heating the pigsty in winter, so that the cost is lowest.
4. All ventilation is realized below the suspended ceiling, and more heat preservation and sealing are not needed above the suspended ceiling, so that the construction cost is reduced.
5. The invention uses the ventilation pipe to ventilate, is convenient to use the heat exchange equipment, and can save the energy consumption of heating and cooling more.
6. The ventilating pipe is used for ventilating, and compared with the traditional ventilating mode, the building structure is easier to realize.
7. If the pig farm needs air filtration, the form can use smaller filter area, thereby saving construction cost and reducing update and maintenance cost.
The invention has reasonable design and good practical application value.
Drawings
FIG. 1 is a schematic plan view of a ventilation system for pigsty according to example 1 of the present invention.
Fig. 2 shows a schematic elevation of a ventilation system for a pig house according to example 1 of the present invention.
FIG. 3 shows a schematic plan view of the air flow of the pig house ventilation system according to example 1 of the present invention.
FIG. 4 is a schematic air-moving elevation of a pigsty ventilation system according to example 1 of the present invention.
FIG. 5 shows a schematic diagram of the heating mode of the method of ventilating operation of a pig house according to example 1 of the present invention.
FIG. 6 shows a schematic diagram of the minimum ventilation mode of the method of operation of the pigsty ventilation of example 1 of the present invention.
FIG. 7 is a schematic diagram showing the maximum ventilation mode of the method of ventilating operation of the pigsty in example 1 of the present invention.
Fig. 8 is a schematic diagram showing a cooling mode of the ventilation operation method of the pigsty in example 1 of the present invention.
FIG. 9 is a schematic plan view showing a ventilation system for pigsty in example 2 of the present invention.
Fig. 10 is a schematic diagram showing an elevation arrangement of a ventilation system for pigsty in example 2 of the present invention.
FIG. 11 shows a schematic plan view of the air flow of the pig house ventilation system according to example 2 of the present invention.
FIG. 12 is a schematic air-moving elevation of a pigsty ventilation system according to example 1 of the present invention.
FIG. 13 is a schematic diagram showing a heating mode of the ventilation operation method of pigsty in example 2 of the present invention.
FIG. 14 is a schematic diagram showing the minimum ventilation mode of the method of ventilating operation of the pigsty in example 2 of the present invention.
FIG. 15 is a schematic diagram showing the maximum ventilation mode of the method of ventilating operation of the pigsty in example 2 of the present invention.
FIG. 16 is a schematic diagram showing a cooling mode of the ventilating operation method of the pigsty in example 2 of the present invention.
In the figure: the system comprises a 1-heat pump system host, 2-heat pump system pipelines, 3-external surface coolers 3, 4-internal surface coolers of a first heat pump system, 5-internal surface coolers of a second heat pump system, 6-first basic air inlet pipes, 7-second basic air inlet pipes, 8-supplementary air inlet pipes, 9-first basic air inlet pipe positive pressure fans, 10-second basic air inlet pipe positive pressure fans, 11-supplementary air inlet pipe positive pressure fans, 12-air outlets, 13-piggeries, 14-first middle pipelines, 15-first air return openings, 16-second air return openings, 17-first heat exchange devices, 18-second heat exchange devices, 19-first air outlet openings, 20-second air outlet openings and 21-second middle pipelines.
Detailed Description
The following detailed description of the present invention will provide further details of the invention with the understanding that the present invention may be practiced with the specific details and with the help of their advantages. The invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit or scope of the invention, which is therefore not limited to the specific embodiments disclosed below.
Example 1
An accurate ventilation system utilizing a heat pump and a ventilation pipe in a pig house, which is realized by the following steps: the pig house comprises a pig house main body 13, first and second basic air inlet pipes 6 and 7, a supplementary air inlet pipe 8, first and second basic air inlet pipe positive pressure fans 9 and 10, a supplementary air inlet pipe positive pressure fan 11, a heat pump system main unit 1, a heat pump system pipeline 2, a heat pump system external surface cooler 3, first and second heat pump system internal surface coolers 4 and 5, a temperature probe, a humidity probe, a controller (the probes and the controller are commonly matched for all pig houses, and belong to the prior art) and the like.
As shown in fig. 1 and 2, the pig house comprises a first basic air inlet pipe (6), a second basic air inlet pipe 7 and a supplementary air inlet pipe 8 which are positioned at the inner top of a pig house 13, wherein the first basic air inlet pipe 6, the second basic air inlet pipe 7 and the supplementary air inlet pipe 8 are arranged in parallel along the length direction of the pig house, and the supplementary air inlet pipe 8 is positioned between the first basic air inlet pipe 6 and the second basic air inlet pipe 7; an air outlet 12 is arranged on a wall body at one side of the pig house 13; a first basic air inlet pipe positive pressure fan 9 and a first heat pump system internal surface cooler 4 are sequentially arranged in the air inlet end of the first basic air inlet pipe 6; a second basic air inlet pipe positive pressure fan 10 and a second heat pump system internal surface cooler 5 are sequentially arranged in the air inlet end of the second basic air inlet pipe 7; a positive pressure fan 11 of the supplementary air inlet pipe is arranged in the air inlet end of the supplementary air inlet pipe 8; the first heat pump system internal surface cooler 4 and the second heat pump system internal surface cooler 5 are connected in series with the heat pump system host 1 through pipelines. The pipe walls of the first basic air inlet pipe 6, the second basic air inlet pipe 7 and the supplementary air inlet pipe 8 are provided with a plurality of air inlets; the heat pump system host 1 is connected with an external surface cooler 3. The air inlet ends of the first basic air inlet pipe 6 and the second basic air inlet pipe 7 are respectively provided with a filtering dust-removing device.
In the concrete implementation, the front ends of the first basic air inlet pipe 6 and the second basic air inlet pipe 7 are provided with the surface coolers 4 and 5 in the first heat pump system and the second heat pump system, so that the ventilation quantity required by the normal growth and metabolism of pigs is ensured, and the air entering a pig house can be cooled and heated through a heat pump; the supplementary air inlet pipe 8 only has ventilation effect and is used for increasing the ventilation amount when the temperature is in a proper range; the heat pump system host 1 comprises a heat pump controller, a compressor, an expansion valve, a four-way valve, a tail end surface cooler, a pipeline, a refrigerating working medium and the like (the part is the standard of the heat pump system and belongs to the prior art); the heat pump system host 1 (comprising a controller, a compressor, an expansion valve, a four-way valve and the like) is positioned at one side outside the pig house, one end of the heat pump system host is connected with the first internal surface cooler 4 and the second internal surface cooler 5 in the front end of the basic air inlet pipe through a heat pump system pipeline 2, and the other end of the heat pump system host is connected with the external surface cooler 3 (generally called a radiator for radiating or taking heat); the front ends of the first and second basic air inlet pipes 6 and 7 and the supplementary air inlet pipe 8 are respectively provided with basic air inlet pipe positive pressure fans 9 and 10 and a supplementary air inlet pipe positive pressure fan 11; the basic air inlet pipe and the supplementary air inlet pipe are distributed in the pig house body along the length direction of the pig house body and are provided with air inlets for uniformly inputting fresh air into the pig house; an air outlet 12 is arranged on the other side of the pigsty body and is used for discharging air in the pigsty.
As shown in fig. 3 and 4, the outdoor air enters the house in the following direction: the first and second basic air inlet pipes are driven by the first and second basic air inlet pipe positive pressure fans 9 and 10 to pass through the surface coolers 4 and 5 in the first and second heat pump systems, then enter the first and second basic air inlet pipes 6 and 7, and then uniformly enter the pigsty through respective air inlets; the other air which does not need heating or refrigerating is driven by the positive pressure fan 11 of the supplementary air inlet pipe to enter the supplementary air inlet pipe 8 and then uniformly enters the pig house through the air inlet; the air in the pig house is discharged from the air outlet 12.
The operation method of the system is divided into four operation modes of heating, minimum ventilation, maximum ventilation and refrigeration, and the corresponding temperature set points are respectively: the lowest set point (20 ℃ in this example), the second set point (22 ℃ in this example) and the highest set point (26 ℃ in this example).
Heating mode (as shown in fig. 5): when the temperature in the pig house is lower than 20 ℃, the basic air inlet pipe positive pressure fans 9 and 10 are opened, the supplementary air inlet pipe positive pressure fans 11 are closed, the heat pump system 1 heats, outdoor air is heated by the internal surface coolers 4 and 5 of the heat pump and then is driven by the basic air inlet pipe positive pressure fans 9 and 10 to enter the basic air inlet pipes 6 and 7, then the air enters the pig house uniformly through the air inlet 14, and the air in the pig house is discharged from the air outlet 12 through the generated pressure.
Minimum ventilation mode (as shown in fig. 6): when the temperature in the pigsty reaches 20 ℃ and is lower than 22 ℃, the heat pump system 1 stops working, the basic air inlet pipe positive pressure fans 9 and 10 continuously work, and the supplementary air inlet pipe positive pressure fan 11 is kept closed; if the temperature continues to rise to 22 ℃, the next ventilation mode (maximum ventilation mode) is entered; if the temperature drops, it returns to the heating mode described above when it drops to 19.5 ℃.
Maximum ventilation mode (as shown in fig. 7): when the temperature in the pig house exceeds 22 ℃ and is lower than 26 ℃, the basic air inlet pipe positive pressure fans 9 and 10 and the supplementary air inlet pipe positive pressure fan 11 are simultaneously started, the basic air inlet pipes 6 and 7 and the supplementary air inlet pipe 8 simultaneously ventilate the pig house, the air inlet quantity is increased, the opening degree of the air outlet 12 is increased, more air is discharged, and the pressure in the pig house is balanced; when the temperature continues to rise to 26 ℃, entering the next ventilation mode (refrigeration mode); if the temperature drops, it returns to the minimum ventilation mode described above when it drops to 21.5 ℃.
Cooling mode (as shown in fig. 8): when the temperature in the pig house reaches the highest set value of 26 ℃, the basic air inlet pipe positive pressure fans 9 and 10 are kept on, the supplementary air inlet pipe positive pressure fan 11 is turned off, meanwhile, the heat pump system 1 is started to be in a refrigerating state, outdoor air enters the pig house after being cooled by the internal surface coolers 4 and 5 of the heat pump, the pig house is cooled, and meanwhile, the air in the pig house is discharged through the air outlet 12; if the temperature drops, it returns to the maximum ventilation mode described above when it drops to 25.5 ℃.
Example 2
An accurate ventilation system utilizing a heat pump and a ventilation pipe in a pig house is provided with an air filtering, tail gas treatment and heat recovery device on the basis of the realization form: comprises a pigsty main body 13, first and second basic air inlet pipes 6 and 7, a supplementary air inlet pipe 8, first and second basic air inlet pipe positive pressure fans 9 and 10, a supplementary air inlet pipe positive pressure fan 11, a heat pump system main body 1, a heat pump system pipeline 2, a heat pump system external surface cooler 3, first and second heat pump system internal surface coolers 4 and 5, first and second heat exchange devices 17 and 18, a filtering system, a dedusting and filtering device, a temperature probe, a humidity probe and a controller (the probe and the controller are commonly matched with all pigsty, belonging to the prior art) and the like.
As shown in fig. 9 and 10, the pig house comprises a first basic air inlet pipe 6, a second basic air inlet pipe 7 and a supplementary air inlet pipe 8 which are positioned at the inner top of a pig house 13, wherein the first basic air inlet pipe 6, the second basic air inlet pipe 7 and the supplementary air inlet pipe 8 are arranged in parallel along the length direction of the pig house, and the supplementary air inlet pipe 8 is positioned between the first basic air inlet pipe 6 and the second basic air inlet pipe 7. The first basic air inlet pipe 6 is connected with a tube side air outlet of a first heat exchange device 17 through a first intermediate pipeline 14, a first heat pump system internal surface cooler 4 is arranged in the first intermediate pipeline 14, a first basic air inlet pipe positive pressure fan 9 is arranged in an air inlet end of a tube side air inlet of the first heat exchange device 17, a shell side air inlet of the first heat exchange device 17 serves as a first air return opening 15 positioned in a pig house 13, and a shell side air outlet of the first heat exchange device 17 serves as a first air outlet 19 of the pig house. The second basic air inlet pipe 7 is connected with a tube side air outlet of the second heat exchange device 18 through a second middle pipeline 21, a second heat pump system internal surface cooler 5 is arranged in the second middle pipeline 21, a second basic air inlet pipe positive pressure fan 10 is arranged in an air inlet end of a tube side air inlet of the second heat exchange device 18, a shell side air inlet of the second heat exchange device 18 serves as a second air return opening 16 positioned in the pig house 13, and a shell side air outlet of the second heat exchange device 18 serves as a second air outlet 20 of the pig house. A positive pressure fan 11 of the supplementary air inlet pipe is arranged in the air inlet end of the supplementary air inlet pipe 8. The first heat pump system internal surface cooler 4 and the second heat pump system internal surface cooler 5 are respectively connected with the heat pump system main unit 1. The heat pump system host 1 is connected with an external surface cooler 3. The pipe walls of the first basic air inlet pipe 6, the second basic air inlet pipe 7 and the supplementary air inlet pipe 8 are provided with a plurality of air inlets; dust removal and filtration devices are arranged in the first air return port 15 and the second air return port 16; the front of the first basic air inlet pipe positive pressure fan 9 and the front of the second basic air inlet pipe positive pressure fan 10 are respectively provided with a filtering dust removing device.
In the concrete implementation, in order to better realize biological safety and environmental protection, an air filtering system and an exhaust gas treatment facility are adopted in a pig farm. Meanwhile, the heat recovery device can save more energy under the condition of using a heat pump. The first and second basic air inlet pipes 6, 7 are respectively provided with first and second heat pump system internal surface coolers 4, 5 in the pipelines connected with the heat exchange device, and can cool and heat the air entering the pig house through the heat pump besides ensuring the ventilation quantity required by the normal growth and metabolism of the pigs; the supplementary air inlet pipe 8 only has ventilation effect and is used for increasing the ventilation amount when the temperature is in a proper range; the heat pump system host 1 comprises a heat pump controller, a compressor, an expansion valve, a four-way valve, a tail end surface cooler, a pipeline, a refrigerating working medium and the like (the part is the standard of the heat pump system and belongs to the prior art); the heat pump system host 1 (comprising a controller, a compressor, an expansion valve, a four-way valve and the like) is positioned at one side outside the pig house, one end of the heat pump system host is connected with the first and second heat pump system internal surface coolers 4 and 5 of the basic air inlet pipe through a heat pump system pipeline 2, and the other end of the heat pump system host is connected with an external surface cooler 3 (generally called a radiator for radiating or taking heat); the front ends of the first and second heat exchange devices 17 and 18 are respectively provided with first and second basic air inlet pipe positive pressure fans 9 and 10, and the front end of the supplementary air inlet pipe 8 is provided with a supplementary air inlet pipe positive pressure fan 11; the basic air inlet pipe and the supplementary air inlet pipe are distributed in the pig house body along the length direction of the pig house body and are provided with air inlets for uniformly inputting fresh air into the pig house; in the middle of the pig house there are provided first and second air return openings 15, 16 for recovering air from the pig house and through first and second heat exchangers 17, 18 and through first and second air outlet openings 19, 20, respectively.
As shown in fig. 11 and 12, the outdoor air enters the house in the following direction: firstly, after being purified by a filtering and dedusting system, a path of positive pressure fans 9 and 10 of a first basic air inlet pipe passes through first and second heat exchange systems 17 and 18, passes through surface coolers 4 and 5 in the first and second heat pump systems, enters first and second basic air inlet pipes 6 and 7, and then uniformly enters a pigsty through respective air inlets; the other air which does not need heating or refrigerating is driven by the positive pressure fan 11 of the supplementary air inlet pipe to enter the supplementary air inlet pipe 8 and then uniformly enters the pig house through the air inlet; the trend of air discharge in the pig house is as follows: after entering the pipeline through the first and second air return openings 15 and 16, the air enters the first and second heat exchange systems 17 and 18 through the dust removal and filtration device, and is discharged out of the house through the first and second air outlet openings 19 and 20.
The operation method of the system is divided into four operation modes of heating, minimum ventilation, maximum ventilation and refrigeration, and the corresponding temperature set points are respectively: the lowest set point (20 ℃ in this example), the second set point (22 ℃ in this example) and the highest set point (26 ℃ in this example).
Heating mode (as shown in fig. 13): when the temperature in the pig house is lower than 20 ℃, the positive pressure fans 9 and 10 of the first and second basic air inlet pipes are turned on, the positive pressure fan 11 of the supplementary air inlet pipe is turned off, and the heat pump system host 1 heats; the outdoor air filtered by the dedusting and filtering system is driven by the positive pressure fans 9 and 10 of the first basic air inlet pipe and the second basic air inlet pipe, enters the first basic air inlet pipe and the second basic air inlet pipe 6 and 7 after being heated by the surface coolers 4 and 5 in the first heat pump system and the second heat pump system, uniformly enters the pigsty through the respective air inlets, enters the first heat exchange device 17 and the second heat exchange device 18 through the first air return inlet 15 and the second air return inlet 16 through the generated pressure, and finally is discharged through the first air outlet 19 and the second air outlet 20.
Minimum ventilation mode (as shown in fig. 14): when the temperature in the pigsty reaches 20 ℃ and is lower than 22 ℃, the heat pump system host 1 stops working, the first and second basic air inlet pipe positive pressure fans 9 and 10 continuously work, and the supplementary air inlet pipe positive pressure fan 11 is kept closed; if the temperature continues to rise to 22 ℃, the next ventilation mode (maximum ventilation mode) is entered; if the temperature drops, it returns to the heating mode described above when it drops to 19.5 ℃.
Maximum ventilation mode (as shown in fig. 15): when the temperature in the pig house exceeds 22 ℃ and is lower than 26 ℃, the first basic air inlet pipe positive pressure fans 9 and 10 and the supplementary air inlet pipe positive pressure fan 11 are simultaneously started, the first basic air inlet pipes 6 and 7 and the supplementary air inlet pipe 8 simultaneously ventilate the pig house, the air inlet quantity is increased, the valve opening of the first air outlet 19 and the second air outlet 20 is increased, so that more air in the pig house is discharged, and the pressure in the pig house is balanced; when the temperature continues to rise to 26 ℃, entering the next ventilation mode (refrigeration mode); if the temperature drops, it returns to the minimum ventilation mode described above when it drops to 21.5 ℃.
Cooling mode (as shown in fig. 16): when the temperature in the pig house reaches the highest set value of 26 ℃, the positive pressure fans 9 and 10 of the first and second basic air inlet pipes are kept on, the positive pressure fan 11 of the supplementary air inlet pipe is turned off, the heat pump system host 1 is started to be in a refrigerating state, and outdoor air enters the pig house after being cooled by the surface coolers 4 and 5 in the first and second heat pump systems, so that the temperature in the pig house is reduced; if the temperature drops, it returns to the maximum ventilation mode described above when it drops to 25.5 ℃.
Finally, it should be noted that the above-mentioned embodiments are merely for illustrating the technical solution of the present invention and not for limiting the same, and although the detailed description is given with reference to the embodiments of the present invention, it should be understood by those skilled in the art that the technical solution of the present invention may be modified or substituted without departing from the spirit and scope of the technical solution of the present invention, and it should be covered by the scope of the claims of the present invention.
Claims (8)
1. A precise ventilation operation method utilizing a heat pump and a ventilation pipe in a pig house is characterized in that: the method is realized in a precise ventilation system utilizing a heat pump and a ventilation pipe in a pig house, the precise ventilation system utilizing the heat pump and the ventilation pipe in the pig house comprises a first basic air inlet pipe (6), a second basic air inlet pipe (7) and a supplementary air inlet pipe (8) which are positioned at the inner top of the pig house (13), the first basic air inlet pipe (6), the second basic air inlet pipe (7) and the supplementary air inlet pipe (8) are arranged in parallel along the length direction of the pig house, and the supplementary air inlet pipe (8) is positioned between the first basic air inlet pipe (6) and the second basic air inlet pipe (7); an air outlet (12) is formed in a wall body on one side of the pigsty (13); a first basic air inlet pipe positive pressure fan (9) and a first heat pump system internal surface cooler (4) are sequentially arranged in the air inlet end of the first basic air inlet pipe (6); a second basic air inlet pipe positive pressure fan (10) and a second heat pump system internal surface cooler (5) are sequentially arranged in the air inlet end of the second basic air inlet pipe (7); a positive pressure fan (11) of the supplementary air inlet pipe is arranged in the air inlet end of the supplementary air inlet pipe (8); the surface cooler (4) in the first heat pump system and the surface cooler (5) in the second heat pump system are connected in series with the heat pump system host (1) through pipelines;
the method is divided into four operation modes of heating, minimum ventilation, maximum ventilation and refrigeration, and the corresponding temperature set points are respectively as follows: a lowest set value, a second set value, and a highest set value;
heating mode: when the temperature in the pig house is lower than the lowest set value, the first basic air inlet pipe positive pressure fans (9 and 10) are opened, the supplementary air inlet pipe positive pressure fans (11) are closed, the heat pump system main machine (1) heats, filtered outdoor air is respectively heated by the first basic air inlet pipe positive pressure fans (9 and 10) and enters the first basic air inlet pipes (6 and 7) after being respectively heated by the first internal surface coolers (4) and the second internal surface coolers (5) of the heat pump system, then evenly enters the pig house (13) through respective air inlets, and the air in the pig house (13) is discharged from the air outlet (12) through the generated pressure;
minimum ventilation mode: when the temperature in the pigsty reaches the lowest set value and is lower than the second set value, the heat pump system host (1) stops working, the first basic air inlet pipe positive pressure fans (9 and 10) continuously work, and the supplementary air inlet pipe positive pressure fan (11) is kept closed; if the temperature continues to rise to the second set value, entering a maximum ventilation mode; if the temperature is reduced, returning to the heating mode when the temperature is reduced to be lower than the lowest set value;
maximum ventilation mode: when the temperature in the pig house exceeds a second set value and is lower than a highest set value, the first basic air inlet pipe positive pressure fans (9 and 10) and the supplementary air inlet pipe positive pressure fans (11) are simultaneously opened, the first basic air inlet pipes (6 and 7) and the supplementary air inlet pipes (8) simultaneously ventilate the pig house (13), the air inlet quantity is increased, the opening degree of the air outlet (12) is increased so as to discharge more air, and the pressure in the pig house is balanced; when the temperature continues to rise to the highest set value, entering a refrigeration mode; if the temperature drops, returning to the minimum ventilation mode;
cooling mode: when the temperature in the pig house (13) reaches the highest set value, the positive pressure fans (9, 10) of the first and second basic air inlet pipes are kept on, the positive pressure fans (11) of the supplementary air inlet pipes are turned off, the main machine (1) of the heat pump system is turned on and is in a refrigerating state, outdoor air is respectively cooled by the surface coolers (4, 5) in the first and second heat pump systems and then is driven by the positive pressure fans (9, 10) of the first and second basic air inlet pipes to enter the first and second basic air inlet pipes (6, 7), and then the air is uniformly introduced into the pig house (13) through respective air inlets to cool the pig house, and meanwhile, the air in the pig house is discharged through the air outlet (12); if the temperature drops, the mode returns to the maximum ventilation mode described above.
2. The method of operation of a precision ventilation system using a heat pump and a ventilation pipe in a pig house according to claim 1, wherein: the lowest set point of the temperature is 20 ℃, the second set point of the temperature is 22 ℃, and the highest set point of the temperature is 26 ℃.
3. The method of operation of a precision ventilation system using a heat pump and a ventilation pipe in a pig house according to claim 2, wherein: the pipe walls of the first basic air inlet pipe (6), the second basic air inlet pipe (7) and the supplementary air inlet pipe (8) are provided with a plurality of air inlets; the heat pump system host (1) is connected with an external surface cooler (3).
4. A method of operation of precision ventilation in a pig house using a heat pump and ventilation pipes according to claim 3, characterized in that: the air inlet ends of the first basic air inlet pipe (6) and the second basic air inlet pipe (7) are internally provided with filtering dust removing devices.
5. A precise ventilation operation method utilizing a heat pump and a ventilation pipe in a pig house is characterized in that: the method is realized in a precise ventilation system utilizing a heat pump and a ventilation pipe in a pig house, the precise ventilation system utilizing the heat pump and the ventilation pipe in the pig house comprises a first basic air inlet pipe (6), a second basic air inlet pipe (7) and a supplementary air inlet pipe (8) which are positioned at the inner top of the pig house (13), the first basic air inlet pipe (6), the second basic air inlet pipe (7) and the supplementary air inlet pipe (8) are arranged in parallel along the length direction of the pig house, and the supplementary air inlet pipe (8) is positioned between the first basic air inlet pipe (6) and the second basic air inlet pipe (7); the first basic air inlet pipe (6) is connected with a tube side air outlet of a first heat exchange device (17) through a first middle pipeline (14), a surface cooler (4) in the first heat pump system is arranged in the first middle pipeline (14), a first basic air inlet pipe positive pressure fan (9) is arranged in an air inlet end of a tube side air inlet of the first heat exchange device (17), a shell side air inlet of the first heat exchange device (17) is used as a first air return opening (15) positioned in a pig house (13), and a shell side air outlet of the first heat exchange device (17) is used as a first air outlet (19) of the pig house; the second basic air inlet pipe (7) is connected with a tube side air outlet of a second heat exchange device (18) through a second middle pipeline (21), a surface cooler (5) in the second heat pump system is arranged in the second middle pipeline (21), a second basic air inlet pipe positive pressure fan (10) is arranged in an air inlet end of a tube side air inlet of the second heat exchange device (18), a shell side air inlet of the second heat exchange device (18) is used as a second air return opening (16) positioned in a pig house (13), and a shell side air outlet of the second heat exchange device (18) is used as a second air outlet (20) of the pig house; a positive pressure fan (11) of the supplementary air inlet pipe is arranged in the air inlet end of the supplementary air inlet pipe (8); the first heat pump system internal surface cooler (4) and the second heat pump system internal surface cooler (5) are respectively connected with the heat pump system host (1);
the method is divided into four operation modes of heating, minimum ventilation, maximum ventilation and refrigeration, and the corresponding temperature set points are respectively as follows: a lowest set value, a second set value, and a highest set value;
heating mode: when the temperature in the pig house is lower than the lowest set value, the positive pressure fans (9, 10) of the first and second basic air inlet pipes are turned on, the positive pressure fan (11) of the supplementary air inlet pipe is turned off, and the heat pump system host (1) heats; the filtered outdoor air is respectively driven by first and second basic air inlet pipe positive pressure fans (9, 10), enters through first and second heat exchange devices (17, 18), respectively enters first and second basic air inlet pipes (6, 7) after being heated by surface coolers (4, 5) in the first and second heat pump systems, evenly enters into a pig house (13) through respective air inlets, and respectively discharges the air in the pig house through first and second air return ports (15, 16) through generated pressure, and through first and second heat exchange devices (17, 18) and first and second air outlet ports (19, 20);
minimum ventilation mode: when the temperature in the pigsty reaches the lowest set value and is lower than the second set value, the heat pump system host (1) stops working, the first basic air inlet pipe positive pressure fans (9 and 10) continuously work, and the supplementary air inlet pipe positive pressure fan (11) is kept closed; if the temperature continues to rise below the second set value, entering a maximum ventilation mode; if the temperature drops, returning to the heating mode;
maximum ventilation mode: when the temperature in the pig house exceeds a second set value and is lower than a highest set value, the first basic air inlet pipe positive pressure fans (9, 10) and the supplementary air inlet pipe positive pressure fans (11) are simultaneously started, the first basic air inlet pipes (6, 7) and the supplementary air inlet pipes (8) simultaneously ventilate the pig house, the air inlet quantity is increased, the opening degree of the first air outlet ports (19, 20) is increased, more air in the pig house is discharged, and the pressure in the pig house is balanced; when the temperature continues to rise to the highest set value, entering a refrigeration mode; if the temperature drops, returning to the minimum ventilation mode;
cooling mode: when the temperature in the pig house reaches the highest set value, the positive pressure fans (9, 10) of the first and second basic air inlet pipes are kept on, the positive pressure fan (11) of the supplementary air inlet pipe is closed, the main machine (1) of the heat pump system is started to be in a refrigerating state, and outdoor air enters the pig house (13) after being cooled by the surface coolers (4, 5) in the first and second heat pump systems respectively, so that the temperature in the pig house is reduced; if the temperature drops, the mode returns to the maximum ventilation mode described above.
6. The method for precise ventilation operation using a heat pump and a ventilation pipe in a pig house according to claim 5, wherein: the lowest set point of the temperature is 20 ℃, the second set point of the temperature is 22 ℃, and the highest set point of the temperature is 26 ℃.
7. The method of operation of a precision ventilation system using a heat pump and a ventilation pipe in a pig house according to claim 6, wherein: the pipe walls of the first basic air inlet pipe (6), the second basic air inlet pipe (7) and the supplementary air inlet pipe (8) are provided with a plurality of air inlets; the heat pump system host (1) is connected with an external surface cooler (3).
8. The method of operation of a precision ventilation system using a heat pump and a ventilation pipe in a pig house according to claim 7, wherein: dust removal and filtration devices are arranged in the first air return port (15) and the second air return port (16); the front sides of the first basic air inlet pipe positive pressure fan (9) and the second basic air inlet pipe positive pressure fan (10) are respectively provided with a filtering dust removing device.
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