CN113678739B

CN113678739B - Environment control system and method for livestock breeding house

Info

Publication number: CN113678739B
Application number: CN202110979036.9A
Authority: CN
Inventors: 张鸣; 周广; 廖启程
Original assignee: Guangdong Vkin Intelligent Environment Technology Co ltd
Current assignee: Guangdong Vkin Intelligent Environment Technology Co ltd
Priority date: 2021-08-25
Filing date: 2021-08-25
Publication date: 2023-11-28
Anticipated expiration: 2041-08-25
Also published as: CN113678739A

Abstract

The invention relates to the field of cultivation environment control, and particularly discloses a livestock cultivation house environment control system and a control method thereof, wherein the system comprises a fresh air unit, a return air unit, an exhaust treatment unit, a heat exchange assembly, an air port assembly, an air supply pipe, a return air pipe, an exhaust pipe and control equipment; the fresh air unit and the return air unit are used for extracting air, filtering, sterilizing viruses and bacteria, and sending out air after temperature and humidity adjustment for environmental control of the livestock breeding house; the exhaust treatment unit is used for extracting air in the exhaust pipe, sterilizing and deodorizing the air and then discharging the air out of the livestock breeding house; the heat exchange assembly is used for realizing heat exchange between fresh air and exhaust air, recycling energy in the exhaust air, and precooling or preheating the fresh air. According to the invention, through the fresh air unit, the exhaust air treatment unit and the return air unit which are simultaneously combined, the operation energy efficiency of the system is improved, the return air unit and the fresh air assembly can jointly treat the fresh air in an air treatment mode, and the system can flexibly change the operation mode according to different working conditions.

Description

Environment control system and method for livestock breeding house

Technical Field

The invention relates to the field of cultivation environment control, in particular to an environment control system and method for a livestock cultivation house.

Background

With the development of modern breeding industry, centralized large-scale poultry and livestock breeding houses are more advanced and efficient, and in order to cope with the air environment quality reduction caused by a large amount of intensive breeding, the breeding environment is degraded to influence the health and meat quality of poultry and livestock, and a fresh air system and a ventilation system are greatly applied.

Most of the existing animal breeding house environment control systems only have a fresh air unit or an exhaust air processing unit, but do not have a return air unit, and when the temperature and humidity control is carried out on the livestock breeding house, the air processing energy consumption of the full fresh air system is large. The energy-saving method is to add a return air unit, and the energy consumption of the return air unit is smaller, so that the operation energy efficiency of the environment control system is improved.

The working condition adaptability of the existing animal breeding house environment control system is to be enhanced, and no air treatment mode is seen in which fresh air and return air are treated by a fresh air unit and a return air unit respectively, and the fresh air can be treated by the return air unit simultaneously; the air treatment mode can flexibly change the operation mode according to the change of the working condition of the system operation, and the energy-saving operation of the environment control system is realized while the environment control requirement of the cultivation house is met.

The existing animal breeding house environment control system generally adopts an exhaust fan with large air quantity, and the air exhaust quantity cannot be accurately controlled according to the environment requirements of the breeding house, so that the energy consumption of the fan is large. When the air discharge quantity is reduced through frequency conversion regulation, the pressure head of a fan is insufficient, polluted air in the cultivation house cannot be smoothly discharged outdoors, the quality of the air in the cultivation house is deteriorated, the health of animals is affected, and animal diseases are caused; in addition, only one exhaust fan is usually arranged on the exhaust pipe, so that the reliability of the environment control system is low.

The existing animal breeding house environment control system, such as a wet curtain system or a common central air conditioning system, has not realized the accurate control of the temperature and humidity of the air supply. And the accurate air supply temperature and humidity control can realize the local accurate air supply mode with small temperature difference, and the air is directly sent to the vicinity of the animal living area, thereby improving the air quality of the animal living area.

When the existing animal breeding house environment control system adopts an air conditioning system, the energy recovery system which does not produce cross pollution between fresh air and exhaust air is rarely adopted, so that the exhaust energy is wasted, and the energy is not saved.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention provides an environment control system and a control method for a livestock breeding house.

The technical scheme adopted by the invention is as follows: an environment control system for a livestock breeding house comprises a plurality of animal living areas, a fresh air unit, a return air unit, an exhaust treatment unit, a heat exchange assembly, an air port assembly, an air supply pipe, a return air pipe, an exhaust pipe and control equipment;

the fresh air unit and the return air unit are used for extracting air, filtering, sterilizing viruses and bacteria, and sending fresh air after temperature and humidity adjustment for environmental control of the livestock breeding house; the exhaust treatment unit is used for extracting air in the exhaust pipe, sterilizing and deodorizing the air and then discharging the air out of the livestock breeding house; the heat exchange assembly comprises a fresh air heat exchanger, an exhaust heat exchanger, a working medium circulating pump and a working medium circulating pipeline, wherein the fresh air heat exchanger is connected with the exhaust heat exchanger in a closed loop through the working medium circulating pipeline, and the working medium circulating pump is arranged on the working medium circulating pipeline; the air port assembly comprises a plurality of air supply ports, a plurality of air return ports and a plurality of air outlet ports, wherein the air supply ports are arranged at the upper part of an animal living area, the air return ports are arranged at one side or more sides of the animal living area, and the air outlet ports are arranged below the animal living area; the control equipment comprises a controller, a valve assembly and a sensor assembly, wherein the controller is used for controlling the working states of the fresh air unit, the return air unit, the exhaust air processing unit and the valve assembly and receiving signals of the sensor assembly, and the sensor assembly is used for detecting the temperature, the humidity, the flow and the concentration of harmful gases of air through sensors; the valve assembly comprises a first fresh air valve, a second fresh air valve and a return air valve; the inlet of the fresh air heat exchanger is communicated with the outside of the livestock breeding house, the outlet of the fresh air heat exchanger is connected with the inlet of the fresh air unit through a second fresh air valve, the outlet of the fresh air heat exchanger is communicated with the inlet of the return air unit through a first fresh air valve, the outlets of the fresh air unit and the return air unit are connected with the air supply pipes, and a plurality of air supply openings are connected with the air supply pipes; the plurality of air return openings are all connected with the front end of the air return pipe, the tail end of the air return pipe is provided with a variable-frequency air return machine, and the variable-frequency air return machine is connected with the inlet of the air return unit through the air return valve; and the exhaust outlets are connected with the inlet of the exhaust treatment unit through the exhaust pipes.

Preferably, the fresh air handling unit comprises a second primary filter, a second intermediate filter, a second air sterilizing device, a fourth surface heat exchanger, a third surface heat exchanger and a second variable-frequency blower which are sequentially connected; the air return unit comprises a first primary filter, a first intermediate filter, a first air sterilizing device, a first surface heat exchanger, a second surface heat exchanger and a first variable-frequency blower which are connected in sequence; the exhaust treatment unit comprises a second variable-frequency exhaust fan, an exhaust deodorizing and sterilizing device, an exhaust heat exchanger, a first variable-frequency exhaust fan and a negative-pressure ventilation device which are connected in sequence.

Preferably, the negative pressure ventilation device is one or a combination of a hood and a wind-proof skylight.

Preferably, the exhaust air heat exchanger and the fresh air heat exchanger are one or a combination of surface heat exchangers or heat pipes.

Preferably, the sensor assembly comprises a plurality of dry bulb temperature sensors, a plurality of humidity sensors, a plurality of harmful gas concentration sensors and a plurality of flow sensors; the inlet of the fresh air heat exchanger, the two ends of the first surface type heat exchanger, the two ends of the second surface type heat exchanger, the two ends of the third surface type heat exchanger, the two ends of the fourth surface type heat exchanger and the animal living area are respectively provided with a dry bulb temperature sensor and a humidity sensor; the outlet of the first variable frequency blower, the outlet of the second variable frequency blower, the inlet of the second variable frequency exhaust fan and the return air pipe are respectively provided with flow sensors, and the animal living area is also provided with a plurality of harmful gas concentration sensors.

A control method of an environment control system of a livestock breeding house comprises the following steps of:

s1, controlling the concentration of harmful gas, measuring the concentration of the harmful gas according to a sensor assembly arranged in an animal living area, wherein the measured value is Ci, the harmful gas concentration threshold value is Ciset, and the harmful gas concentration control difference value is DeltaCi; when Ci is more than or equal to Ciset+DeltaCi, the ventilation quantity of the fresh air unit is increased, so that the fresh air quantity is increased, and the concentration of harmful gases in an animal living area is reduced; when Ci is less than or equal to Ciset-DeltaCi, the ventilation quantity of the fresh air unit is reduced, and the fresh air quantity is reduced;

s2, controlling air humidity, setting a humidity measurement value of air measured by a sensor assembly in an animal living area as RHn, setting a humidity threshold value as RHset, and setting a humidity control difference value as delta RH; when RHn is more than or equal to RHset+delta RH, the refrigerating capacity of the fresh air unit is increased, so that the dehumidifying capacity is increased, and the humidity of an animal living area is reduced; when RHn is less than or equal to Rhset-delta RH, the refrigerating capacity of the fresh air unit is reduced, the dehumidifying capacity is reduced, and the humidity of an animal living area is increased;

s3, further controlling humidity, when the refrigerating capacity of the refrigerating system of the fresh air unit reaches the upper limit and RHn is still more than or equal to RHset+delta RH, increasing the air supply quantity of the fresh air unit, increasing the dehumidification efficiency and reducing the humidity RHn of an animal living area; when the refrigerating capacity of the refrigerating system reaches the lower limit and RHn is still less than or equal to Rhset-delta RH, the refrigerating equipment of the fresh air handling unit for refrigerating is stopped;

S4, controlling the ambient temperature, and measuring the temperature Tn of the air through a sensor assembly in an animal living area; setting a temperature threshold value as Tset, and setting a temperature control difference value as delta T; when Tn is more than or equal to Tset+delta T, the refrigerating efficiency of the air return unit is increased, so that the indoor refrigerating capacity is increased, and the temperature of an animal living area is reduced; when Tn is less than or equal to Tset-delta T, the refrigerating efficiency of the air return unit is reduced, so that the indoor refrigerating capacity is reduced, and the temperature of an animal living area is increased; thereby, the temperature Tn of the living area of the animal is changed within the range meeting the requirement;

s5, further controlling the temperature, and increasing the refrigerating capacity of the fresh air unit when the refrigerating capacity of the return air unit reaches the upper limit of the power of the equipment and Tn is more than or equal to Tnset+delta T, so that the refrigerating capacity of the whole system is increased and the temperature of an animal living area is reduced; when the frequency and the refrigerating capacity of the compressor of the refrigerating system of the return air unit reach the lower limit value and Tn is still less than or equal to Tset-delta T, the compressor of the refrigerating system of the return air unit is closed, so that the refrigerating capacity of the whole system is reduced, and the temperature of an animal living area is increased; thereby, the temperature Tn of the living area of the animal is changed within a range meeting the requirement.

Preferably, the method further comprises the following steps:

S6, controlling the exhaust amount, wherein the sensor assembly measures the indoor and outdoor pressure difference delta P of the cultivation house, sets an indoor and outdoor pressure difference threshold delta Pset, and sets the indoor and outdoor pressure difference control difference value to be 5Pa; when the delta P is more than or equal to delta Pset+5, the air exhaust quantity of the air exhaust treatment unit is reduced, so that the indoor and outdoor pressure difference delta P is reduced; when the delta P is less than or equal to delta Pset-5, the exhaust air quantity of the exhaust treatment unit is increased, so that the indoor and outdoor pressure difference delta P is increased.

Preferably, the method further comprises the steps of:

s7, further controlling the air exhaust quantity, and closing one of the first variable-frequency exhaust fan or the second variable-frequency exhaust fan when the working power of the first variable-frequency exhaust fan and the second variable-frequency exhaust fan reaches the lower limit and delta P is still more than or equal to delta Pset+5; when the delta P is less than or equal to delta Pset-5, the working power of the running variable-frequency exhaust fan is increased; when the working efficiency of the running variable-frequency exhaust fan reaches the upper limit and delta P is still less than or equal to delta Pset-5, the first variable-frequency exhaust fan and the second variable-frequency exhaust fan are started.

The beneficial effects of the invention are as follows:

(1) Through simultaneously concurrent fresh air unit and exhaust air treatment unit and return air unit, the enthalpy difference or the difference in temperature of return air treatment is less, consumes less cold or heat, and the required evaporating temperature of refrigeration is higher, i.e. the refrigeration system has high energy efficiency ratio and low treatment energy consumption, thereby improving the operation energy efficiency of the system.

(2) The fresh air and the return air are respectively processed by the fresh air unit and the return air unit, and the return air unit can simultaneously process the fresh air, so that the system can flexibly change the operation mode according to different working conditions, and the energy-saving purpose is achieved while the environment control requirement of the cultivation house is met.

Drawings

FIG. 1 is a schematic diagram of an environmental control system according to the present invention.

In the figure: 1. a first new damper; 2. a first primary filter; 3. a first neutral-effect filter; 4. a first air decontamination device; 5. a first surface heat exchanger; 6. a second surface heat exchanger; 7. a first variable frequency blower; 8. a return air unit; 9. a controller; 10. an air supply pipe; 11. an air return pipe; 12. an air supply port; 13. an air return port; 14. a negative pressure ventilation device; 15. the first variable-frequency exhaust fan; 16. an exhaust heat exchanger; 17. an exhaust deodorizing and sterilizing device; 18. the second variable-frequency exhaust fan; 19. an air outlet; 20. an exhaust pipe; 21. a working medium circulating pump; 22. a working medium circulating pipeline; 23. a fresh air unit; 24. a second variable frequency blower; 25. a third surface heat exchanger; 26. a fourth surface heat exchanger; 27. a second air decontamination device; 28. a second neutral-effect filter; 29. a second primary filter; 30. the second fresh air valve; 31. variable frequency return air machine; 32. a return air valve; 33. a fresh air heat exchanger; 34. a dry bulb temperature sensor; 35. a humidity sensor; 36. a harmful gas concentration sensor; 37. a flow sensor.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and detailed description, wherein it is to be understood that, on the premise of no conflict, the following embodiments or technical features may be arbitrarily combined to form new embodiments.

Referring to fig. 1, the invention is a livestock breeding house environment control system and a control method thereof, wherein an animal living area is an area in a dashed line frame in the livestock breeding house in the figure, and the livestock breeding house environment control system comprises a plurality of animal living areas, a fresh air unit 23, a return air unit 8, an exhaust air processing unit, a heat exchange component, an air port component, an air supply pipe 10, a return air pipe 11, an exhaust pipe 20 and control equipment;

the fresh air unit 23 and the return air unit 8 are used for extracting air, filtering, sterilizing viruses and bacteria, regulating the temperature and humidity, and sending fresh air for controlling the environment of the livestock breeding house; the exhaust treatment unit is used for extracting air in the exhaust pipe 20, sterilizing and deodorizing the air and then discharging the air out of the livestock breeding house; the heat exchange assembly comprises a fresh air heat exchanger 33, an exhaust heat exchanger 16, a working medium circulating pump 21 and a working medium circulating pipeline 22, wherein the fresh air heat exchanger 33 and the exhaust heat exchanger 16 are connected in a closed loop through the working medium circulating pipeline 22, and the working medium circulating pump 21 is arranged on the working medium circulating pipeline 22; the air port assembly comprises a plurality of air supply ports 12, a plurality of air return ports 13 and a plurality of air outlet ports 19, wherein the air supply ports 12 are arranged at the upper part of an animal living area, the air return ports 13 are arranged at one or more sides of the animal living area and are arranged at any position of the upper part, the middle part and the lower part of the animal living area, the preferable air return ports 13 are arranged at the middle lower part of the animal living area, and the air outlet ports 19 are arranged below the animal living area; the control equipment comprises a controller 9, a valve assembly and a sensor assembly, wherein the controller 9 is used for controlling the working states of the fresh air unit 23, the return air unit 8, the exhaust air processing unit and the valve assembly and receiving signals of the sensor assembly, and the sensor assembly is used for detecting the temperature, the humidity, the flow and the concentration of harmful gases of air through sensors; the valve assembly comprises a first fresh air valve 1, a second fresh air valve 30 and a return air valve 32; the inlet of the fresh air heat exchanger 33 is communicated with the outside of the livestock breeding house, the outlet of the fresh air heat exchanger 33 is connected with the inlet of the fresh air unit 23 through the second fresh air valve 30, the outlet of the fresh air heat exchanger 33 is communicated with the inlet of the return air unit 8 through the first fresh air valve 1, the outlets of the fresh air unit 23 and the return air unit 8 are both connected with the air supply pipe 10, and a plurality of air supply inlets 12 are both connected with the air supply pipe 10; the plurality of air return openings 13 are all connected with the front end of the air return pipe 11, the tail end of the air return pipe 11 is provided with a variable-frequency air return fan 31, and the variable-frequency air return fan 31 is connected with the inlet of the air return unit 8 through an air return valve 32; the plurality of air outlets 19 are all connected with the inlet of the air exhaust treatment unit through an air exhaust pipe 20.

Preferably, the fresh air handling unit 23 includes a second primary filter 29, a second intermediate filter 28, a second air sterilizing device 27, a fourth surface heat exchanger 26, a third surface heat exchanger 25, and a second variable frequency blower 24, which are sequentially connected; the air return unit 8 comprises a first primary filter 2, a first intermediate filter 3, a first air sterilizing device 4, a first surface heat exchanger 5, a second surface heat exchanger 6 and a first variable-frequency blower 7 which are connected in sequence; the exhaust treatment unit comprises a second variable frequency exhaust fan 18, an exhaust deodorizing and sterilizing device 17, an exhaust heat exchanger 16, a first variable frequency exhaust fan 15 and a negative pressure ventilation device 14 which are connected in sequence.

Preferably, the negative pressure ventilation device 14 is one of a hood or a sunroof or a combination thereof.

Preferably, the exhaust heat exchanger 16 and the fresh air heat exchanger 33 are each one of a surface heat exchanger or a heat pipe or a combination thereof.

Preferably, the sensor assembly includes a number of dry bulb temperature sensors 34, a number of humidity sensors 35, a number of harmful gas concentration sensors 36, a number of flow sensors 37; the inlet of the fresh air heat exchanger 33, the two ends of the first surface heat exchanger 5, the two ends of the second surface heat exchanger 6, the two ends of the third surface heat exchanger 25, the two ends of the fourth surface heat exchanger 26 and the animal living area are respectively provided with a dry bulb temperature sensor 34 and a humidity sensor 35; the outlet of the first variable frequency blower 7, the outlet of the second variable frequency blower 24, the inlet of the second variable frequency exhaust fan 18 and the return air pipe 11 are uniformly provided with flow sensors 37, and the animal living area is also provided with a plurality of harmful gas concentration sensors 36.

s1, controlling the concentration of harmful gas, measuring the concentration of the harmful gas according to a sensor assembly arranged in an animal living area, wherein the measured value is Ci, the harmful gas concentration threshold value is Ciset, and the harmful gas concentration control difference value is DeltaCi; when Ci is more than or equal to Ciset+DeltaCi, the ventilation quantity of the fresh air unit 23 is increased, so that the fresh air quantity is increased, and the concentration of harmful gases in an animal living area is reduced; when Ci is less than or equal to Ciset-DeltaCi, the ventilation quantity of the fresh air unit 23 is reduced, and the fresh air quantity is reduced;

s2, controlling air humidity, setting a humidity measurement value of air measured by a sensor assembly in an animal living area as RHn, setting a humidity threshold value as RHset, and setting a humidity control difference value as delta RH; when RHn is more than or equal to RHset+delta RH, the refrigerating capacity of the fresh air unit 23 is increased, so that the dehumidifying capacity is increased, and the humidity of an animal living area is reduced; when RHn is less than or equal to Rhset-delta RH, the refrigerating capacity of the fresh air unit 23 is reduced, the dehumidifying capacity is reduced, and the humidity of the animal living area is increased;

s3, further controlling humidity, when the refrigerating capacity of the refrigerating system of the fresh air unit 23 reaches the upper limit and RHn is still more than or equal to RHset+delta RH, increasing the air supply quantity of the fresh air unit 23, increasing the dehumidification efficiency and reducing the humidity RHn of an animal living area; when the refrigerating capacity of the refrigerating system reaches the lower limit and RHn is not more than Rhset-delta RH, the refrigerating equipment of the fresh air handling unit 23 for refrigerating is stopped;

S4, controlling the ambient temperature, and measuring the temperature Tn of the air through a sensor assembly in an animal living area; setting a temperature threshold value as Tset, and setting a temperature control difference value as delta T; when Tn is more than or equal to Tset+delta T, the refrigerating efficiency of the air return unit 8 is increased, so that the indoor refrigerating capacity is increased, and the temperature of an animal living area is reduced; when Tn is less than or equal to Tset-delta T, the refrigerating efficiency of the air return unit 8 is reduced, so that the indoor refrigerating capacity is reduced, and the temperature of an animal living area is increased; thereby, the temperature Tn of the living area of the animal is changed within the range meeting the requirement;

s5, further controlling the temperature, and increasing the refrigerating capacity of the fresh air unit 23 when the refrigerating capacity of the air return unit 8 reaches the upper limit of the power of the equipment and Tn is more than or equal to Tset+delta T, so that the refrigerating capacity of the whole system is increased and the temperature of an animal living area is reduced; when the frequency and the refrigerating capacity of the compressor of the refrigerating system of the return air unit 8 reach the lower limit value and Tn is still less than or equal to Tset-delta T, the compressor of the refrigerating system of the return air unit 8 is closed, so that the refrigerating capacity of the whole system is reduced, and the temperature of an animal living area is increased; thereby, the temperature Tn of the living area of the animal is changed within a range meeting the requirement.

Preferably, the method further comprises the steps of:

s7, further controlling the air discharge quantity, and when the working power of the first variable-frequency exhaust fan 15 and the second variable-frequency exhaust fan 18 reaches the lower limit and delta P is still more than or equal to delta Pset+5, closing one of the first variable-frequency exhaust fan 15 or the second variable-frequency exhaust fan 18; when the delta P is less than or equal to delta Pset-5, the working power of the running variable-frequency exhaust fan is increased; when the working efficiency of the running variable frequency exhaust fan reaches the upper limit and ΔP is still less than or equal to ΔPset-5, the first variable frequency exhaust fan 15 and the second variable frequency exhaust fan 18 are started.

The fresh air unit 23 is internally provided with a third surface heat exchanger 25 and a fourth surface heat exchanger 26 for carrying out heat-humidity treatment on fresh air. The air return unit 8 is internally provided with a first surface heat exchanger 5 and a second surface heat exchanger 6 for carrying out heat and humidity treatment on return air or fresh air or mixed air of the fresh air and the return air.

The first primary filter 2, the first intermediate filter 3, the first air sterilizing device 4, the second intermediate filter 28, the second primary filter 29 and the second air sterilizing device 27 are all used for filtering air, sterilizing viruses and bacteria, and purifying return air and fresh air.

The negative pressure ventilation device 14 (a hood or a wind-proof skylight and the like) enables the outlet of the exhaust pipe 20 to form a negative pressure natural ventilation power effect, thereby achieving the purpose of energy conservation.

The first variable frequency exhaust fan 15 is used for helping the second variable frequency exhaust fan 18 overcome the flow resistance of the exhaust air treatment unit, the actual flow of the exhaust air treatment unit can be detected through the flow sensor 37 in front of the second variable frequency exhaust fan 18, and when the negative pressure generated by the negative pressure ventilation device 14 and the pressure head generated by the second variable frequency exhaust fan 18 are enough to overcome the flow resistance of the exhaust air treatment unit, the controller 9 sends out a command to close the first variable frequency exhaust fan 15, so that the energy saving is further realized.

The exhaust heat exchanger 16 (surface heat exchanger or heat pipe, etc.), the working medium circulating pump 21, the working medium circulating pipeline 22 and the fresh air heat exchanger 33 (surface heat exchanger or heat pipe, etc.) are combined together to form a heat exchange assembly for realizing the heat exchange between fresh air and exhaust air, recovering and reutilizing the energy in the exhaust air, pre-cooling or preheating the fresh air, thereby effectively reducing the energy consumption of fresh air treatment and realizing the energy-saving operation of fresh air treatment.

Preferably, the controller 9 further comprises a network communication interface for enabling the controller 9 to connect to a communication network for remote data transmission and remote control.

As a specific embodiment of the present invention, taking a live pig breeding house as an example,

s1, controlling the concentration of harmful gas, selecting one of the harmful gases such as carbon dioxide, ammonia gas and hydrogen sulfide as a concentration control target, taking carbon dioxide as an example, measuring the concentration of the harmful gas according to a sensor assembly arranged in an animal living area, wherein the measured value is Ci, setting a harmful gas concentration threshold value as Ciset (the Ciset of the embodiment is 900 mg/cubic meter and is set according to actual requirements), and setting a harmful gas concentration control difference value as Deltaci (the embodiment is 50 mg/cubic meter and is set according to actual requirements); when Ci is more than or equal to Ciset+DeltaCi, the ventilation quantity of the fresh air unit 23 is increased, so that the fresh air quantity is increased, and the concentration of harmful gases in an animal living area is reduced; when Ci is less than or equal to Ciset-DeltaCi, the ventilation quantity of the fresh air unit 23 is reduced, and the fresh air quantity is reduced; at this time, the concentration of harmful gas in the living area of the animal can be increased; thus, the concentration of carbon dioxide in the arrangement of the living areas of the animals is controlled in the range of the requirement, and the ventilation of the requirement control is realized;

S2, controlling air humidity, setting a humidity measurement value of air measured by a sensor assembly in an animal living area as RHn (relative humidity or moisture content), setting a humidity threshold value as RHset (the relative humidity is 70% in the embodiment and is set according to actual requirements), and setting a humidity control difference value as delta RH (the relative humidity is 10% in the embodiment and is set according to actual requirements); when RHn is more than or equal to RHset+delta RH, the refrigerating capacity of the fresh air unit 23 is increased, so that the dehumidifying capacity is increased, and the humidity of an animal living area is reduced; when RHn is less than or equal to Rhset-delta RH, the refrigerating capacity of the fresh air unit 23 is reduced, the dehumidifying capacity is reduced, and the humidity of the animal living area is increased; thereby the humidity RHn of the living area of the animal is changed within the range meeting the requirement;

s3, further controlling humidity, when the refrigerating capacity of the refrigerating system of the fresh air unit 23 reaches the upper limit and RHn is still more than or equal to RHset+delta RH, increasing the air supply quantity of the fresh air unit 23, increasing the dehumidification efficiency and reducing the humidity RHn of an animal living area; when the refrigerating capacity of the refrigerating system reaches the lower limit and RHn is not more than Rhset-delta RH, the refrigerating equipment for refrigerating of the fresh air handling unit 23 is stopped, so that the humidity RHn of the animal living area is increased; thereby, the humidity RHn of the living area of the animal is changed within the range meeting the requirement;

S4, controlling the ambient temperature, and measuring the temperature Tn of the air through a sensor assembly in an animal living area; setting a temperature threshold value as Tset (the relative temperature is 27 ℃ in the embodiment, and the temperature control difference value is set as delta T (1 ℃ in the embodiment, and the temperature control difference value is set according to the actual requirement); when Tn is more than or equal to Tset+delta T, the refrigerating efficiency of the air return unit 8 is increased, so that the indoor refrigerating capacity is increased, and the temperature of an animal living area is reduced; when Tn is less than or equal to Tset-delta T, the refrigerating efficiency of the air return unit 8 is reduced, so that the indoor refrigerating capacity is reduced, and the temperature of an animal living area is increased; thereby, the temperature Tn of the living area of the animal is changed within the range meeting the requirement;

s5, further controlling the temperature, and increasing the refrigerating capacity of the fresh air unit 23 when the refrigerating capacity of the air return unit 8 reaches the upper limit of the power of the equipment and Tn is more than or equal to Tset+delta T, so that the refrigerating capacity of the whole system is increased and the temperature of an animal living area is reduced; when the frequency and the refrigerating capacity of the compressor of the refrigerating system of the return air unit 8 reach the lower limit value and Tn is still less than or equal to Tset-delta T, the compressor of the refrigerating system of the return air unit 8 is closed, so that the refrigerating capacity of the whole system is reduced, and the temperature of an animal living area is increased; thereby, the temperature Tn of the living area of the animal is changed within the range meeting the requirement;

S6, controlling the exhaust amount, wherein a sensor assembly measures the indoor and outdoor pressure difference delta P of the cultivation house, and sets an indoor and outdoor pressure difference threshold delta Pset (10 Pa according to actual requirements in the embodiment), and the indoor and outdoor pressure difference control difference value is set to be 5Pa (according to actual requirements); when Δp is greater than or equal to Δpset+5, the exhaust amount of the exhaust treatment unit is reduced (in actual engineering, one of the first variable-frequency exhaust fan 15 and the second variable-frequency exhaust fan 18 can be canceled according to actual conditions, that is, only one variable-frequency exhaust fan with larger total pressure needs to be arranged), so that the indoor and outdoor pressure difference Δp is reduced; when the delta P is less than or equal to delta Pset-5, increasing the exhaust air quantity of the exhaust treatment unit, so that the indoor and outdoor pressure difference delta P is increased; so that the pressure difference between the indoor and the outdoor is about 10Pa, and the indoor pressure is ensured to be higher than the outdoor pressure;

s7, further controlling the air exhaust quantity, and when the working power of the first variable-frequency exhaust fan 15 and the second variable-frequency exhaust fan 18 reaches the lower limit and delta P is still more than or equal to delta Pset+5, closing one of the first variable-frequency exhaust fan 15 or the second variable-frequency exhaust fan 18 to reduce the indoor and outdoor pressure difference delta P; when the delta P is less than or equal to delta Pset-5, the working power of the running variable-frequency exhaust fan is increased; when the working efficiency of the running variable-frequency exhaust fan reaches the upper limit and ΔP is still less than or equal to ΔPset-5, the first variable-frequency exhaust fan 15 and the second variable-frequency exhaust fan 18 are both started, and the exhaust system is operated according to the step S6; thus, through the combined operation adjustment of the two exhaust pipes, the pressure difference between the indoor and the outdoor is about 10Pa, and the indoor pressure is ensured to be higher than the outdoor pressure.

The following describes the system structure scheme and the control method in detail according to different working conditions:

(1) When only the fresh air handling unit 23 and the exhaust air handling unit are needed, the air handling flow is as follows:

A. the fresh air operation flow is as follows: outdoor air, fresh air heat exchanger 33, second fresh air valve 30, second primary filter 29, second intermediate filter 28, second air sterilizing device 27, fourth surface heat exchanger 26, third surface heat exchanger 25, second variable frequency blower 24, air supply pipe 10, air supply port 12 and animal living area;

B. the exhaust operation flow is as follows: animal living area, air outlet 19, air exhaust pipe 20, second variable frequency air exhaust fan 18, air exhaust deodorizing and sterilizing device 17, air exhaust heat exchanger 16, first variable frequency air exhaust fan 15, negative pressure ventilation device 14 and outdoor;

C. the return air unit 8 is closed.

The control mode is as follows:

the environmental control parameters of the animal living area are detected by a dry bulb temperature sensor 34, a humidity sensor 35 and a harmful gas concentration sensor 36 provided in the animal living area, and these sensor data are transmitted to the controller 9. The controller 9 determines that the indoor environment control requirement can be satisfied by only turning on the fresh air handling unit 23 and the exhaust air handling unit according to the preset control parameter target value and control algorithm program, and sends out a control command to control the cooling capacity (or heating capacity) of the fourth surface heat exchanger 26 or the third surface heat exchanger 25 and the rotation speed of the second variable frequency blower 24 in the fresh air handling unit 23. Meanwhile, the controller 9 sends out instructions according to a matching algorithm program between the air discharge quantity and the air supply quantity, and controls the rotating speeds of the second variable frequency exhaust fan 18 and the first variable frequency exhaust fan 15, so that the air discharge quantity is accurately controlled.

Through the control mode, the ventilation quantity is prevented from being too large or too small while the indoor air quality is maintained, and the ventilation is controlled according to the requirement, so that the energy-saving operation of the environment control system is realized. The first variable frequency exhaust fan 15 is used for helping the second variable frequency exhaust fan 18 overcome the flow resistance of the exhaust air treatment unit, the actual flow of the exhaust air treatment unit can be detected through the flow sensor 37 in front of the second variable frequency exhaust fan 18, and when the negative pressure generated by the negative pressure ventilation device 14 and the pressure head generated by the second variable frequency exhaust fan 18 are enough to overcome the flow resistance of the exhaust air treatment unit, the controller 9 sends out a command to close the first variable frequency exhaust fan 15, so that energy conservation is further brought.

(2) The ventilation mode is controlled only by the requirements of the return air unit 8 and the exhaust air treatment unit.

At this time, the air treatment flow is:

A. the flow of air supply and return is as follows: outdoor air, a fresh air heat exchanger 33, a first new air valve 1, a first primary filter 2, a first intermediate filter 3, a first air sterilizing device 4, a first surface heat exchanger 5, a second surface heat exchanger 6, a first variable frequency blower 7, an air supply pipe 10, an air supply port 12 and an animal living area; indoor return air, an air return opening 13, an air return pipe 11, a variable frequency return fan 31, an air return valve 32, a first primary filter 2, a first intermediate filter 3, a first air sterilizing device 4, a first surface heat exchanger 5, a second surface heat exchanger 6, a first variable frequency blower 7, an air supply pipe 10, an air supply opening 12 and an animal living area.

B. The exhaust flow is as follows: indoor polluted air, an air outlet 19, an air exhaust pipe 20, a second variable frequency air exhaust fan 18, an air exhaust deodorizing and sterilizing device 17, an air exhaust heat exchanger 16, a first variable frequency air exhaust fan 15, a negative pressure ventilation device 14 and the outside.

At this time, the fresh air handling unit 23 is turned off.

The control mode is as follows:

the dry bulb temperature sensor 34, the humidity sensor 35 and the harmful gas concentration sensor 36 provided in the animal living area detect environmental control parameters of the animal living area. These sensor data are passed to the controller 9. The controller 9 determines that the indoor environment control requirement can be satisfied only by opening the air return unit 8 and the air exhaust processing unit according to the preset control parameter target value and the control algorithm program, and sends out a control command to control the refrigerating capacity (or heating capacity) of the first surface heat exchanger 5 or the second surface heat exchanger 6 and the rotating speeds of the first variable-frequency air blower 7 and the variable-frequency air return blower 31 in the air return unit 8. Meanwhile, the controller 9 sends out instructions according to a matching algorithm program between the air discharge quantity and the air supply quantity, and controls the rotating speeds of the second variable frequency exhaust fan 18 and the first variable frequency exhaust fan 15, so that the air discharge quantity is accurately controlled. Through the control mode, the ventilation quantity is prevented from being too large or too small while the indoor air quality is maintained, and the requirement control ventilation is realized, so that the energy-saving operation of the environment control system is realized. The actual flow of the exhaust air treatment unit can be detected by the flow sensor 37 in front of the second variable frequency exhaust fan 18, and when the negative pressure generated by the negative pressure ventilation device 14 and the pressure head generated by the second variable frequency exhaust fan 18 are enough to overcome the flow resistance of the exhaust air treatment unit, the controller 9 sends out a command to close the first variable frequency exhaust fan 15, so that energy conservation is further brought.

(3) Demand control ventilation mode for simultaneously starting fresh air unit 23, return air unit 8 and exhaust air treatment unit

At this time, the air treatment flow is:

A. the flow of the air supply system is as follows: outdoor air, fresh air heat exchanger 33, second fresh air valve 30, second primary filter 29, second intermediate filter 28, second air sterilizing device 27, fourth surface heat exchanger 26, third surface heat exchanger 25, second variable frequency blower 24, air supply pipe 10, air supply port 12 and animal living area;

indoor return air, an air return opening 13, an air return pipe 11, a variable frequency return fan 31, an air return valve 32, a first primary filter 2, a first intermediate filter 3, a first air sterilizing device 4, a first surface heat exchanger 5, a second surface heat exchanger 6, a first variable frequency blower 7, an air supply pipe 10, an air supply opening 12 and an animal living area.

At this time, the first fresh air valve 1 is closed.

The control mode is as follows:

the dry bulb temperature sensor 34, the humidity sensor 35 and the harmful gas concentration sensor 36 provided in the animal living area detect environmental control parameters of the animal living area. These sensor data are passed to the controller 9. The controller 9 judges that the fresh air unit 23, the return air unit 8 and the exhaust air processing unit can meet the indoor environment control requirement according to the preset control parameter target value and the preset control algorithm program, and respectively sends out control instructions to control the refrigerating capacity (or heating capacity) of the fourth surface heat exchanger 26 or the third surface heat exchanger 25 in the fresh air unit 23 and the rotating speed of the second variable-frequency blower 24; the refrigerating capacity (or heating capacity) of the first surface heat exchanger 5 or the second surface heat exchanger 6 inside the return air unit 8 and the rotating speed of the first variable frequency blower 7 are controlled. Meanwhile, the controller 9 sends out instructions according to a matching algorithm program among the fresh air quantity, the return air quantity and the exhaust air quantity, and controls the rotating speeds of the second variable frequency air blower 24, the first variable frequency air blower 7, the variable frequency return air blower 31, the second variable frequency exhaust fan 18 and the first variable frequency exhaust fan 15, so that the fresh air quantity, the return air quantity and the exhaust air quantity are accurately controlled. Through the control mode, the ventilation quantity is prevented from being too large or too small while the indoor air quality is maintained, and the requirement control ventilation is realized, so that the energy-saving operation of the environment control system is realized. The actual flow of the exhaust air treatment unit can be detected by the flow sensor 37 in front of the second variable frequency exhaust fan 18, and when the negative pressure generated by the negative pressure ventilation device 14 and the pressure head generated by the second variable frequency exhaust fan 18 are enough to overcome the flow resistance of the exhaust air treatment unit, the controller 9 sends out a command to close the first variable frequency exhaust fan 15, so that energy conservation is further brought.

(4) Fresh air operation mode without refrigeration or heating

Under certain working conditions, the outdoor meteorological conditions meet the requirement of directly entering fresh air, and then the refrigerating or heating system is closed, so that the fresh air is directly fed into a room without heat and humidity treatment, and meanwhile, an exhaust treatment unit is opened. At this time, according to the control requirement of the indoor environment, or only the fan and the air sterilizing device inside the fresh air handling unit 23 are started; or only the fan and the air sterilizing device inside the return air unit 8 are started; or simultaneously turn on the fans and air sterilizing devices inside the fresh air unit 23 and the return air unit 8.

The air treatment process comprises the following steps:

A. when only the fan and the air sterilizing device inside the fresh air handling unit 23 are started:

the flow of the air supply system is as follows: outdoor air, a second fresh air valve 30, a second primary filter 29, a second intermediate filter 28, a second air sterilizing device 27, a second variable-frequency blower 24, an air supply pipe 10, an air supply port 12 and an animal living area;

the exhaust flow is as follows: indoor polluted air, an air outlet 19, an air exhaust pipe 20, a second variable frequency air exhaust fan 18, an air exhaust deodorizing and sterilizing device 17, a first variable frequency air exhaust fan 15, a negative pressure ventilating device 14 and the outdoors;

at this time, the first fresh air valve 1 is closed, the return air unit 8 is closed, and the return air unit 8 is closed.

B. When only the fan and the air sterilizing device in the return air unit 8 are started:

the flow of the air supply system is as follows: outdoor air, a first fresh air valve 1, a first primary filter 2, a first intermediate filter 3, a first air sterilizing device 4, a first variable-frequency blower 7, an air supply pipe 10, an air supply port 12 and an animal living area;

the exhaust flow is as follows: indoor polluted air, an air outlet 19, an air exhaust pipe 20, a second variable frequency air exhaust fan 18, an air exhaust deodorizing and sterilizing device 17, a first variable frequency air exhaust fan 15, a negative pressure ventilating device 14 and the outdoors.

At this time, the second fresh air valve 30 is closed, and the fresh air handling unit 23 is closed.

C. When the fan and the air sterilizing device in the fresh air unit 23 and the return air unit 8 are simultaneously turned on:

the first air supply flow is as follows: part of outdoor air, a fresh air heat exchanger 33, a second fresh air valve 30, a second primary filter 29, a second intermediate filter 28, a second air sterilizing device 27, a second variable-frequency blower 24, an air supply pipe 10, an air supply port 12 and an animal living area;

the second air supply flow is as follows: the other part of outdoor air, a first fresh air valve 1, a first primary filter 2, a first intermediate filter 3, a first air sterilizing device 4, a first variable-frequency blower 7, an air supply pipe 10, an air supply port 12 and an animal living area;

The control mode is as follows:

the dry bulb temperature sensor 34, the humidity sensor 35 and the harmful gas concentration sensor 36 provided in the animal living area detect environmental control parameters of the animal living area. Further, the outdoor air inlet is provided with a dry bulb temperature sensor 34 and a humidity sensor 35. These sensor data are passed to the controller 9. The controller 9 determines that the indoor and outdoor weather conditions meet the requirement of directly entering fresh air according to the preset control parameter target value and control algorithm program, and respectively sends out control instructions to control the refrigerating capacity (or heating capacity) of the fourth surface heat exchanger 26 and the third surface heat exchanger 25 in the fresh air unit 23 and the first surface heat exchanger 5 and the second surface heat exchanger 6 in the return air unit 8 to be closed. Meanwhile, the controller 9 sends out instructions according to a matching algorithm program between the fresh air quantity and the exhaust quantity, and controls the rotation speeds of the second variable frequency air blower 24 (or the first variable frequency air blower 7 or both of the first variable frequency air blower and the first variable frequency air blower) and the second variable frequency air blower 18 and the first variable frequency air blower 15, so that the fresh air quantity and the exhaust quantity are accurately controlled. Through the control mode, the ventilation quantity is prevented from being too large or too small while the indoor air quality is maintained, and the requirement control ventilation is realized, so that the energy-saving operation of the environment control system is realized. The actual flow of the exhaust air treatment unit can be detected by the flow sensor 37 in front of the second variable frequency exhaust fan 18, and when the negative pressure generated by the negative pressure ventilation device 14 and the pressure head generated by the second variable frequency exhaust fan 18 are enough to overcome the flow resistance of the exhaust air treatment unit, the controller 9 sends out a command to close the first variable frequency exhaust fan 15, so that energy conservation is further brought.

(5) Part of fresh air refrigerating or heating treatment and part of fresh air direct-entering fresh air running mode

Under certain working conditions, if outdoor meteorological conditions meet the requirement of partial fresh air direct entry, a refrigerating or heating system of the return air unit 8 is closed, and partial fresh air is directly fed into a room without heat-humidity treatment; the other part of fresh air is subjected to heat-moisture treatment through the fresh air handling unit 23, and meanwhile, the exhaust air handling unit is turned on.

A. The fresh air treatment flow without heat and humidity treatment comprises outdoor air, a first fresh air valve 1, a first primary filter 2, a first intermediate filter 3, a first air sterilizing device 4, a first variable frequency blower 7, an air supply pipe 10, an air supply port 12 and an animal living area;

B. the fresh air treatment flow after the heat and humidity treatment comprises outdoor air, a fresh air heat exchanger 33, a second fresh air valve 30, a second primary filter 29, a second intermediate filter 28, a second air sterilizing device 27, a fourth surface heat exchanger 26, a third surface heat exchanger 25, a second variable frequency blower 24, an air supply pipe 10, an air supply port 12 and an animal living area;

C. the exhaust flow is as follows: indoor polluted air, an air outlet 19, an air exhaust pipe 20, a second variable frequency air exhaust fan 18, an air exhaust deodorizing and sterilizing device 17, an air exhaust heat exchanger 16, a first variable frequency air exhaust fan 15, a negative pressure ventilation device 14 and the outside.

At this time, the first fresh air valve 1 is opened, and the variable frequency return air fan 31 and the return air valve 32 are closed.

The control mode is as follows:

the dry bulb temperature sensor 34, the humidity sensor 35 and the harmful gas concentration sensor 36 provided in the animal living area detect environmental control parameters of the animal living area. Further, the outdoor air inlet is provided with a dry bulb temperature sensor 34 and a humidity sensor 35. These sensor data are passed to the controller 9. The controller 9 judges that the indoor and outdoor weather conditions meet the requirement that part of fresh air is directly input and part of fresh air needs heat and humidity treatment according to the preset control parameter target values and control algorithm programs, and respectively sends out control instructions to control the refrigeration capacity (or heating capacity) of the fourth surface heat exchanger 26 and the third surface heat exchanger 25 in the fresh air unit 23 to be opened; the first surface heat exchanger 5 and the second surface heat exchanger 6 inside the return air unit 8 are controlled to be closed; the first new air valve 1 is controlled to be opened, and the variable-frequency return air fan 31 and the return air valve 32 are controlled to be closed. Meanwhile, the controller 9 sends out instructions according to a matching algorithm program between the fresh air quantity and the exhaust quantity, and controls the rotation speeds of the second variable frequency air blower 24 (or the first variable frequency air blower 7 or both of the first variable frequency air blower and the first variable frequency air blower) and the second variable frequency air blower 18 and the first variable frequency air blower 15, so that the fresh air quantity and the exhaust quantity are accurately controlled. Through the control mode, the ventilation quantity is prevented from being too large or too small while the indoor air quality is maintained, and the requirement control ventilation is realized, so that the energy-saving operation of the environment control system is realized. The actual flow of the exhaust air treatment unit can be detected by the flow sensor 37 in front of the second variable frequency exhaust fan 18, and when the negative pressure generated by the negative pressure ventilation device 14 and the pressure head generated by the second variable frequency exhaust fan 18 are enough to overcome the flow resistance of the exhaust air treatment unit, the controller 9 sends out a command to close the first variable frequency exhaust fan 15, so that energy conservation is further brought.

The design mode that the air return unit 8 of this embodiment can handle fresh air simultaneously is equivalent to the backup of fresh air unit 23, has improved the reliability of system.

The operation mode of the independent fresh air conditioning system can be realized. At this time, the refrigerating system of the fresh air unit 23 is controlled to independently operate, so that fresh air is borne by all wet loads of the system, namely, all latent heat loads and part of sensible heat loads in the room are borne in addition to the fresh air load; and the indoor residual sensible heat load is borne by the return air unit 8. In this way, the refrigerator of the return air unit 8 can be maintained to operate at a higher evaporating temperature, and the energy efficiency of the system is improved. Meanwhile, the return air unit 8 realizes the running of a dry coil pipe, and can effectively prevent the problem of environmental pollution caused by accumulated water. Therefore, the design has energy saving potential and is beneficial to indoor air quality.

At this time, the air treatment process is the same as the process of "simultaneously turning on the demand control ventilation mode of the fresh air handling unit 23, the return air handling unit 8 and the exhaust air handling unit".

The control mode is as follows:

the dry bulb temperature sensor 34, the humidity sensor 35 and the harmful gas concentration sensor 36 provided in the animal living area detect environmental control parameters of the animal living area. These sensor data are passed to the controller 9. The controller 9 respectively sends out control instructions according to preset control parameter target values and control algorithm programs of the running modes of the independent fresh air conditioning system, and controls the evaporation temperature, the refrigerating capacity and the rotating speed of the second variable frequency blower 24 of the fourth surface heat exchanger 26 or the third surface heat exchanger 25 in the fresh air unit 23, so that the fresh air bears all wet loads of the system, and the indoor humidity control requirement is met; the evaporating temperature of the first surface type heat exchanger 5 or the second surface type heat exchanger 6 in the return air unit 8 is controlled to be higher than the dew point temperature of return air, and the two surface type heat exchangers are kept in a dry coil running state. Meanwhile, the controller 9 sends out instructions according to a matching algorithm program among the fresh air quantity, the return air quantity and the exhaust air quantity, and controls the rotating speeds of the second variable frequency air blower 24, the first variable frequency air blower 7, the variable frequency return air blower 31, the second variable frequency exhaust fan 18 and the first variable frequency exhaust fan 15, so that the fresh air quantity, the return air quantity and the exhaust air quantity are accurately controlled.

Through the control mode, the ventilation quantity is prevented from being too large or too small while the indoor air quality is maintained, and the requirement control ventilation is realized, so that the energy-saving operation of the environment control system is realized. The actual flow of the exhaust air treatment unit can be detected by the flow sensor 37 in front of the second variable frequency exhaust fan 18, and when the negative pressure generated by the negative pressure ventilation device 14 and the pressure head generated by the second variable frequency exhaust fan 18 are enough to overcome the flow resistance of the exhaust air treatment unit, the controller 9 sends out a command to close the first variable frequency exhaust fan 15, so that energy conservation is further brought.

In addition, the invention passes through the second variable frequency exhaust fan 18, the flow sensor 37 in front of the second variable frequency exhaust fan, the first variable frequency exhaust fan 15 and the negative pressure ventilation device 14; the controller 9 can send out instructions according to a matching algorithm program among the fresh air quantity, the return air quantity and the exhaust air quantity, and control the rotating speeds of the second variable frequency air blower 24, the first variable frequency air blower 7, the variable frequency return air blower 31, the second variable frequency exhaust fan 18 and the first variable frequency exhaust fan 15, so that the fresh air quantity, the return air quantity and the exhaust air quantity are accurately controlled.

Through the control mode, the ventilation quantity is prevented from being too large or too small while the indoor air quality is maintained, and the requirement control ventilation is realized, so that the energy-saving operation of the environment control system is realized. The actual flow of the exhaust air treatment unit can be detected by the flow sensor 37 in front of the second variable frequency exhaust fan 18, and when the negative pressure generated by the negative pressure ventilation device 14 and the pressure head generated by the second variable frequency exhaust fan 18 are enough to overcome the flow resistance of the exhaust air treatment unit, the controller 9 sends out a command to close the first variable frequency exhaust fan 15, so that energy conservation is further brought. Through these measures, effectively solved current animal and bred house environmental control system and generally adopted the very big exhaust fan of amount of wind, the unable accurate control of volume of airing exhaust according to breeding house environmental requirement leads to the big problem of fan energy. Compared with the exhaust pipe 20 provided with only one exhaust fan, the second variable frequency exhaust fan 18, the first variable frequency exhaust fan 15 and the negative pressure ventilation device 14 form an exhaust power system, so that a sufficient exhaust pressure head is effectively ensured, and the exhaust reliability is greatly improved. The problems that when the air quantity is reduced through frequency conversion regulation, the pressure head of the fan of the existing large-air-quantity exhaust fan is insufficient, polluted air of a breeding house cannot be smoothly discharged outdoors, the quality of the environmental air of the breeding house is deteriorated, the health of animals is affected, and animal diseases are caused are effectively solved.

The fresh air handling unit 23 is internally provided with a fourth surface type heat exchanger 26 and a third surface type heat exchanger 25; the interior of the return air unit 8 is provided with a first surface type heat exchanger 5 and a second surface type heat exchanger 6; like this, when fourth surface formula heat exchanger 26 and first surface formula heat exchanger 5 are operated under the refrigeration operating mode, can be respectively through adjusting the heating capacity of third surface formula heat exchanger 25 and second surface formula heat exchanger 6, realize fresh air unit 23 and the accurate air supply temperature and humidity control of return air unit 8 to lay the basis for realizing little difference in temperature local accurate air supply mode. The small-temperature-difference local accurate air supply mode can directly send air to the vicinity of the animal living area, and can effectively improve the air quality of the animal living area.

The environmental control system of the present invention is provided with an exhaust heat exchanger 16 (surface heat exchanger or heat pipe, etc.), a working medium circulation pump 21, a working medium circulation pipe 22, and a fresh air heat exchanger 33 (surface heat exchanger or heat pipe, etc.). The combined function of the equipment pipelines is to realize the heat exchange of fresh air and exhaust air, recover the energy in the exhaust air, precool or preheat the fresh air, thereby effectively reducing the energy consumption of the fresh air treatment and realizing the energy-saving operation of the fresh air treatment.

The indirect transfer of fresh air exhaust energy is achieved by circulating working medium flowing between the exhaust heat exchanger 16 and the fresh air heat exchanger 33, so that cross contamination between fresh air exhaust is not generated.

The working process is as follows:

1. refrigeration condition

In the cooling working condition in summer, the outdoor air temperature is higher, and the exhaust air temperature is lower; under the pushing action of the working medium circulating pump 21, the working medium reaches the exhaust heat exchanger 16 through the working medium circulating pipeline 22, and the working medium is cooled by exhaust air in the exhaust heat exchanger 16; then, the working medium returns to the fresh air heat exchanger 33 through the working medium circulating pipeline 22, the working medium is heated in the fresh air heat exchanger 33 by outdoor air, and the fresh air flows through the outer surface of the fresh air heat exchanger 33 to be cooled, so that the precooling of the fresh air and the energy recovery of exhaust air are realized; and so on.

2. Heating working condition

When heating is performed in winter, the outdoor air temperature is lower, and the exhaust air temperature is higher; under the pushing action of the working medium circulating pump 21, the working medium reaches the exhaust heat exchanger 16 through the working medium circulating pipeline 22, and the working medium is exhausted and heated in the exhaust heat exchanger 16; then, the working medium returns to the fresh air heat exchanger 33 through the working medium circulating pipeline 22, the working medium is cooled in the fresh air heat exchanger 33 by the outdoor air, and the fresh air flows through the outer surface of the fresh air heat exchanger 33 to be heated, so that the preheating of the fresh air and the energy recovery of exhaust air are realized, and the circulation is realized.

The air supply port 12 of the embodiment is arranged above an animal living area, and adopts a precise air supply mode with local short range; the air return opening 13 is arranged at the middle lower part of the animal living area and adopts a local accurate air return mode; the air outlet 19 is arranged below the living area of the animals. Thus, the air supply firstly passes through the animal breathing zone, and the animal can be effectively guaranteed to breathe fresh air at the first time. The air flow flows from the animal respiratory region to the lower part of the animal living region, so that the air quality of the living region of the live pigs can be ensured, the sanitary condition of the live pig breeding is maintained, and the incidence rate of diseases is reduced.

The above embodiments are only preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, but any insubstantial changes and substitutions made by those skilled in the art on the basis of the present invention are intended to be within the scope of the present invention as claimed.

Claims

1. A control method of an environment control system of a livestock breeding house is characterized by comprising the following steps: is applied to an environment control system of a livestock breeding house,

specifically, the livestock breeding house environment control system comprises a plurality of animal living areas, a fresh air unit, a return air unit, an exhaust air treatment unit, a heat exchange assembly, an air port assembly, an air supply pipe, a return air pipe, an exhaust pipe and control equipment;

the fresh air unit and the return air unit are used for extracting air, filtering, sterilizing viruses and bacteria, and sending out air after temperature and humidity adjustment to control the environment of the livestock breeding house;

the exhaust treatment unit is used for extracting air in the exhaust pipe, sterilizing and deodorizing the air and then discharging the air out of the livestock breeding house;

the heat exchange assembly comprises a fresh air heat exchanger, an exhaust heat exchanger, a working medium circulating pump and a working medium circulating pipeline, wherein the fresh air heat exchanger is connected with the exhaust heat exchanger in a closed loop through the working medium circulating pipeline, and the working medium circulating pump is arranged on the working medium circulating pipeline;

The air port assembly comprises a plurality of air supply ports, a plurality of air return ports and a plurality of air outlet ports, wherein the air supply ports are arranged at the upper part of an animal living area, the air return ports are arranged at one or more sides of the animal living area, and the air outlet ports are arranged below the animal living area;

the control equipment comprises a controller, a valve assembly and a sensor assembly, wherein the controller is used for controlling the working states of the fresh air unit, the return air unit, the exhaust air processing unit and the valve assembly and receiving signals of the sensor assembly, and the sensor assembly is used for detecting the temperature, the humidity, the flow and the concentration of harmful gases of air through sensors;

the valve assembly comprises a first fresh air valve, a second fresh air valve and a return air valve;

the inlet of the fresh air heat exchanger is communicated with the outside of the livestock breeding house, the outlet of the fresh air heat exchanger is connected with the inlet of the fresh air unit through a second fresh air valve, the outlet of the fresh air heat exchanger is communicated with the inlet of the return air unit through a first fresh air valve, the outlets of the fresh air unit and the return air unit are connected with the air supply pipes, and a plurality of air supply openings are connected with the air supply pipes;

the plurality of air return openings are all connected with the front end of the air return pipe, the tail end of the air return pipe is provided with a variable-frequency air return machine, and the variable-frequency air return machine is connected with the inlet of the air return unit through the air return valve;

The exhaust outlets are connected with the inlet of the exhaust treatment unit through the exhaust pipes;

the fresh air handling unit comprises a second primary filter, a second intermediate filter, a second air sterilizing device, a fourth surface heat exchanger, a third surface heat exchanger and a second variable-frequency blower which are sequentially connected;

the air return unit comprises a first primary filter, a first intermediate filter, a first air sterilizing device, a first surface heat exchanger, a second surface heat exchanger and a first variable-frequency blower which are connected in sequence;

the exhaust treatment unit comprises a second variable-frequency exhaust fan, an exhaust deodorizing and sterilizing device, an exhaust heat exchanger, a first variable-frequency exhaust fan and a negative-pressure ventilation device which are connected in sequence;

the negative pressure ventilation device is one or a combination of a hood and a wind-proof skylight;

the exhaust heat exchanger and the fresh air heat exchanger are one or a combination of a surface heat exchanger and a heat pipe;

the sensor assembly comprises a plurality of dry bulb temperature sensors, a plurality of humidity sensors, a plurality of harmful gas concentration sensors and a plurality of flow sensors; the inlet of the fresh air heat exchanger, the two ends of the first surface type heat exchanger, the two ends of the second surface type heat exchanger, the two ends of the third surface type heat exchanger, the two ends of the fourth surface type heat exchanger and the animal living area are respectively provided with a dry bulb temperature sensor and a humidity sensor; the outlet of the first variable-frequency air blower, the outlet of the second variable-frequency air blower, the inlet of the second variable-frequency exhaust fan and the return air pipe are respectively provided with flow sensors, and the animal living area is also provided with a plurality of harmful gas concentration sensors;

The control method comprises the following implementation steps:

s5, further controlling the temperature, and increasing the refrigerating capacity of the fresh air unit when the refrigerating capacity of the return air unit reaches the upper limit of the power of the equipment and Tn is more than or equal to Tnset+delta T, so that the refrigerating capacity of the whole system is increased and the temperature of an animal living area is reduced; when the frequency and the refrigerating capacity of the compressor of the refrigerating system of the return air unit reach the lower limit value and Tn is still less than or equal to Tset-delta T, the compressor of the refrigerating system of the return air unit is closed, so that the refrigerating capacity of the whole system is reduced, and the temperature of an animal living area is increased; thereby, the temperature Tn of the living area of the animal is changed within the range meeting the requirement;

the method also comprises the following steps:

s6, controlling the exhaust amount, wherein the sensor assembly measures the indoor and outdoor pressure difference delta P of the cultivation house, sets an indoor and outdoor pressure difference threshold delta Pset, and sets the indoor and outdoor pressure difference control difference value to be 5Pa; when the delta P is more than or equal to delta Pset+5, the air exhaust quantity of the air exhaust treatment unit is reduced, so that the indoor and outdoor pressure difference delta P is reduced; when the delta P is less than or equal to delta Pset-5, increasing the exhaust air quantity of the exhaust treatment unit, so that the indoor and outdoor pressure difference delta P is increased;

The exhaust treatment unit comprises a second variable-frequency exhaust fan, an exhaust deodorizing and sterilizing device, an exhaust heat exchanger, a first variable-frequency exhaust fan and a negative-pressure ventilation device which are connected in sequence; the method also comprises the following steps: