CN214841392U

CN214841392U - Large-air-volume replacement type fresh air system based on total heat recovery of air source heat pump

Info

Publication number: CN214841392U
Application number: CN202022125602.3U
Authority: CN
Inventors: 李钢; 李崇兴
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-09-25
Filing date: 2020-09-25
Publication date: 2021-11-23
Anticipated expiration: 2030-09-25

Abstract

The patent of the utility model discloses a big amount of wind replacement formula new trend system based on air source heat pump total heat recovery, including new trend purification heating unit, heat recovery unit and the liquid working medium circulation system of airing exhaust. After outdoor fresh air (fresh air) is purified by the coarse filter layer, the pretreatment filter layer, the gas purification layer and the pm2.5 filter layer, the heat energy recovered from the exhaust air by the air source heat pump is utilized to heat the fresh air to be close to room temperature, and then the fresh air enters the room. The technology replaces indoor air with purified and heated fresh air in a forced ventilation mode, and can fully meet the fresh air volume and air quality specified by national standards. Meanwhile, the relevant standards of noise, energy saving and the like are met. The air source heat pump can recover lost heat energy from the exhaust air by consuming less electric energy, so that the balance of the air inlet and outlet amount is realized, the heat balance is also realized, and the indoor temperature is kept.

Description

Large-air-volume replacement type fresh air system based on total heat recovery of air source heat pump

Technical Field

The utility model relates to a receive big amount of wind replacement formula new trend system based on air source heat pump total heat is retrieved, the ventilation in personnel intensive places such as specially adapted school's classroom.

Background

The quality of indoor air is affected by various pollutants released by building materials, decorations, furniture, articles, kitchens, toilets and human bodies, and serious pollution can be caused under the condition that fresh air (fresh air) is not introduced into the room. Since indoor pollution is a superposition of indoor and outdoor pollutants, indoor pollution is more serious than outdoor pollution. The more people in the room consume more oxygen, the more CO2, odor and other gases are generated, and the work, study and health are seriously affected by oxygen deficiency and air pollution. Monitoring results show that indoor air pollution is very prominent, the concentration of the pollution indicator CO2 in a certain meeting room and a certain classroom rapidly rises along with time, reaches 0.7 percent and 0.5 percent respectively in 1 hour, 50 minutes and 45 minutes, the meeting room exceeds the national standard by 6 times, and the classroom exceeds by more than 2 times.

National standard for indoor air quality in China for CO in air₂The concentrations of pollutants such as formaldehyde, ammonia, volatile organic compounds, particulate matters and the like are all specified, long-term research and practice at home and abroad prove that the most economical and effective method for reaching the standard is ventilation, so that the condition that the adult needs to provide 30m of air every hour³New wind, 19m for students in middle and primary schools³. Considering that the outdoor atmospheric environment is polluted to different degrees, the fresh air needs to be purified. In order to maintain the original indoor temperature during the heating and air-conditioning refrigeration periods, temperature compensation and energy-saving measures are required. Therefore, to meet the standard requirements, a fresh air system consisting of air supply and exhaust, purification treatment, heat recovery and temperature compensation must be established.

At present, the following problems still exist in a fresh air system for treating indoor air pollution and preventing virus cross infection:

1. the central air conditioners of high-grade buildings are all provided with fresh air systems, but some central air conditioners are not good enough in operation, and the main problems are that the fresh air volume is insufficient, the purification treatment effect is poor, the energy consumption is high particularly during heating and refrigeration, the indoor and outdoor noise is large, the ventilation pipelines are difficult to clean and disinfect, and the like.

2. Other public places are less likely to adopt fresh air systems, but schools are the most likely places to adopt. Teenagers are in the future of the country and are in the important stage of learning knowledge and body growth, students concentrate on classrooms for a long time and are key groups of cross infection, and the country has long made clear stipulations on various indexes of the fresh air standard, but the standards cannot meet the requirements due to no major breakthrough on the related technology, so the teenagers are not popularized. In the severe haze period of 2015, a local education department calls for parents, part of schools demonstrate and install fresh air systems, and finally pause due to incapability of reaching standards and other technical problems, so that the existing main problems include the problems of low heat recovery amount, no temperature compensation and the like except that the fresh air amount is seriously insufficient, the air quality is unqualified and the noise exceeds the standard.

3. The fresh air quantity is seriously insufficient. According to the standard, the fresh air volume of a primary school classroom is 855m per hour³950m for middle school³However, most of the air volume of the existing fresh air system is only 300m³On the left and right, the difference is far from each other, which is also the main reason for the indoor air quality not reaching the standard. The existing fresh air system is a small and complete independent system, if a large-air-volume fan is selected, the volume of related equipment such as a heat exchanger and a filtering purifier is increased due to high air pressure and high noise, and if a plurality of sets of low-noise fresh air systems are selected, the space of the classroom is limited.

4. The indoor air quality does not reach the standard. The fresh air volume is a main factor influencing the indoor air quality, but the large air volume is used for meeting the standard beyond the requirement, so that great cost is paid, and a ventilation replacement mode with high replacement efficiency is adopted in a scientific method. The indoor CO2 concentration standard is used as a comparison condition, the ratio of the standard fresh air volume to the actual fresh air volume is specified as the replacement efficiency of the classroom fresh air, the larger the ratio is, the higher the replacement efficiency of the fresh air system is, the smaller the fresh air volume reaching the air quality standard is, and the great benefits are achieved in reducing noise and saving energy. Research shows that the through type replacement of the fresh air in the classroom uses 30% less fresh air than the common top air outlet and top air return replacement, because under the condition of small air exchange space, part of the outlet air can form short circuit to enter the return air, and the replacement effect is not exerted. The factor that influences replacement efficiency still has the cluster wind and the air leakage of new trend system, because each unit in the current new trend host computer adopts extrusion connection mostly, hardly accomplishes sealedly, and it is indoor that air exhaust and indoor air most probably cluster into or leak into the new trend and return to indoor. And because the air outlet positioned outdoors is close to the fresh air inlet, part of fresh air can be mixed. Above condition all can all influence the replacement efficiency of new trend system to different extents, need bigger fresh air volume just can reach standard.

5. The noise exceeds the standard. The fresh air system needs a fan to supply air and exhaust air, and the noise is also an important problem which puzzles the fresh air system because the resistance of equipment such as filtration, purification, heat exchange, heating, pipelines and the like needs the fan with higher air pressure to generate larger noise. In 2019, on the air quality management workshop of the national campus held by the national conference center, the detection noise value given by a report issued by a certain province reaches about 70 decibels. The state does not have a special noise standard for a classroom fresh air system, and the daytime should not exceed 55 decibels according to the national environmental noise standard, but the existing fresh air system is difficult to meet the requirement in order to achieve the largest possible air volume.

6. The heat recovery amount is small. The heat exchanger mode is mostly adopted in the current new trend system exhaust heat recovery, and the heat exchange efficiency who detects under specific conditions is higher, nevertheless receives the volume space restriction in view of in the new fan, and the heat exchange efficiency of in-service use can not exceed 50%. In the aspect of heat recovery, less exhaust air is caused by air leakage, so that the heat recovery is less, and the heat loss is increased because the replacement efficiency is low and the air volume needs to be increased. In summary, the heat recovery efficiency of the existing fresh air system cannot represent the heat recovery amount, and the actually recovered and exerted heat amount is much less than 50%.

7. Most of the existing classroom fresh air systems have no temperature compensation. According to the small air volume of the existing fresh air system, the influence of the temperature reduction of 1-2 ℃ in winter on the room temperature is not very large, if the air volume is increased by 2 times or even more according to the standard air volume, the indoor temperature is obviously reduced, heat is required to be provided for temperature compensation, and therefore equipment, the volume, the cost and the energy consumption are increased.

Disclosure of Invention

In order to achieve the purpose, the technical scheme of the utility model a big amount of wind link up replacement formula new trend system based on air source heat pump total heat recovery is designed, including new trend purification heating unit, the heat recovery unit of airing exhaust and liquid working medium circulation system.

The fresh air purifying and heating unit comprises a fresh air purifier and a fresh air heater and is installed in a fresh air case.

The fresh air purifier comprises an air distribution channel, a coarse filter layer, a pretreatment filter layer, a gas purification layer, a pm2.5 filter layer, an induced draft fan and a case. When the device is arranged outdoors, outdoor fresh air (fresh air) firstly passes through the shutter and passes through the filter screen of the coarse filter layer to intercept winged insects, poplar catkins, sand grains and the like; then removing the particulate matters more than pm2.5 through a filter screen of the pretreatment filter layer; then removing gaseous pollutants through a gas purification layer; then, removing the particulate matters smaller than pm2.5 through a pm2.5 filter layer filter screen; and finally, the clean fresh air is sent into the heater by the induced draft fan, and multi-stage noise reduction measures are adopted in the case. When the indoor air conditioner is arranged indoors, the air conditioner is uniformly distributed to the parallel purification systems through the distribution channels and then sequentially passes through the outdoor unit. The filter screen of the coarse filter layer is made of metal or fiber, the filter screen of the pretreatment pm2.5 filter layer is made of fiber with different pore diameters, and the gas purification layer is composed of a molecular sieve with an adsorption and catalysis function, a breathable bag and a grating. The filter screen and the purification layer are placed in the sequence, sealing is completed by the sealing strip, the bolt and the negative pressure together, a door for replacing the filter screen, the purification layer and the fan for overhauling and cleaning is reserved on the side surface of the case, and the door is sealed by the sealing strip and the bolt. The air supply adopts a multi-fan parallel connection mode, and noise is controlled by determining the optimal rotating speed of the fans to meet the air volume requirement.

The fresh air heater comprises finned tubes and a box body, and purified fresh air is heated by a heat exchanger to be heated to be close to room temperature (about 20 ℃) from the ambient temperature. The finned tube heat exchanger is a gas-liquid heat exchanger, the heat exchanger is made of copper tube aluminum fins, and an inlet and an outlet on the liquid side of the heat exchanger are connected with a pipeline of the liquid working medium circulating system.

The fresh air case is made of heat-insulating and sound-absorbing materials, a fresh air purifier and a fresh air heater are installed in the case, and the case body is hung on an outer wall outside a classroom window, so that the filter material of the fresh air purifier can be conveniently replaced. The tripe air inlet valve is equipped with to the new trend import side, is in the closed condition when the new trend system does not operate, isolated external and indoor passageway, and supply-air duct and air outlet are equipped with to the new trend outlet side.

Preferably, the fresh air case is arranged in the classroom and is installed on the ground;

preferably, the fresh air case is arranged in the classroom and is installed in a wall manner;

preferably, the fresh air case is arranged in a classroom and suspended from the ceiling of the classroom.

One end of the air supply pipeline is connected with the fresh air case, the other end of the air supply pipeline penetrates through the wall to be connected with the air outlet, and the air outlet is composed of a pressure equalizing box and an air outlet adjusting orifice plate.

The pressure equalizing box is made of sound absorbing materials, and the cross section of the pressure equalizing box is semicircular, rectangular, triangular or trapezoidal; oval air outlet holes are uniformly distributed on the surface, a movable stainless steel air outlet adjusting pore plate is attached to the surface of the oval air outlet holes, the oval air outlet holes are distributed on the oval air outlet holes, the air outlet quantity is adjusted by changing the position to convey fresh air to the room, so that the room is in a micro-positive pressure state, and partial air is forced to be discharged to a corridor through the air outlet shutter with a higher position.

The air outlet shutter is a shutter arranged above the wall opposite to the fresh air inlet, and dirty air at the upper part of the room enters the corridor through the shutter under the action of fresh air micro-positive pressure, so that indoor air flow and updating are realized.

The exhaust heat recovery unit consists of an exhaust air duct and a special air source heat pump unit, and the temperature difference of an air inlet and an air outlet of an evaporator of the special air source heat pump is more than 15 ℃ so as to ensure that the temperature of heated fresh air is close to the indoor temperature when the outdoor environment temperature is 5 ℃ and keep the indoor temperature stable.

The special air source heat pump unit is fixedly arranged outside a lighting window at the end part of the corridor, and the window is connected with an air outlet of the air source heat pump evaporator through an air exhaust duct. Air exchanged from the indoor to the corridor enters the heat pump evaporator through the air exhaust duct, is cooled to 15 ℃ and then is discharged into the atmosphere. The heat in the air is absorbed by the working medium in the evaporator, the working medium is heated by the compressor and transferred to the condenser, the circulating working medium water of the system is heated to 60 ℃ by the condenser, and enters the finned tube heat exchanger of the fresh air heater through the liquid working medium circulating pipeline system to heat the fresh air, so that the fresh air is close to the indoor room temperature. Considering that the temperature is lowered in extreme weather, the temperature of the fresh air is still lower than the room temperature after being heated, and an electric heating heat supplementing device can be installed.

Preferably, the dedicated air source heat pump of the exhaust heat recovery unit is fixedly installed outside a lighting window of the toilet, so that polluted air in the toilet and air in a corridor can be exhausted to the outside together.

The matching quantity of the special air source heat pumps is set in a balanced way according to the total air exhaust quantity of a room provided with a fresh air facility on the floor and the air intake quantity of the heat pump evaporator.

The liquid working medium circulating pipeline system comprises a circulating pump connected with a heat pump condenser, and pipelines, valves and other pipe fittings for entering and exiting the circulating system.

Considering the high temperature and the damp heat in summer in the areas with cold winter and hot summer in south China, the air-conditioning refrigeration function is needed. This patent can increase refrigeration function with air source heat pump set, and the air conditioning season exports cold water and passes through circulation system and new trend heat exchanger with new trend cooling and dehumidification.

A large-air-volume replacement type fresh air system based on total heat recovery of an air source heat pump comprises a fresh air purification heating unit and an exhaust heat recovery unit. The air source heat pump air conditioner is suitable for meeting the requirement of large air volume fresh air of an independent large-area room, and adopts a mode that a condenser of a special air source heat pump and a host machine are arranged in a split mode. The heat pump condenser is arranged in the fresh air box to directly heat fresh air.

The fresh air purifier comprises an air distribution channel, a coarse filter layer, a pretreatment filter layer, a gas purification layer, a pm2.5 filter layer, an induced draft fan and a case. When the device is installed outdoors, outdoor fresh air (fresh air) firstly passes through the shutter and passes through the filter screen of the coarse filter layer to intercept winged insects, poplar catkins, sand grains and the like; then removing the particulate matters more than pm2.5 through a filter screen of the pretreatment filter layer; then removing gaseous pollutants through a gas purification layer; then, removing the particulate matters smaller than pm2.5 through a pm2.5 filter layer filter screen; and finally, the clean fresh air is sent into the heater by the induced draft fan, and multi-stage noise reduction measures are adopted in the case. When the indoor air conditioner is arranged indoors, the air conditioner is uniformly distributed to the parallel purification systems through the distribution channels and then sequentially passes through the outdoor unit.

The filter screen of the coarse filter layer is made of metal or fiber, the filter screen of the pretreatment pm2.5 filter layer is made of fiber with different pore diameters, and the gas purification layer is composed of a molecular sieve with an adsorption and catalysis function, a breathable bag and a grating. The filter screen and the purification layer are placed in the sequence, sealing is completed by the sealing strip, the bolt and the negative pressure together, a door for replacing the filter screen, the purification layer and the fan for overhauling and cleaning is reserved on the side surface of the case, and the door is sealed by the sealing strip and the bolt. The air supply adopts a multi-fan parallel connection mode, and noise is controlled by determining the optimal rotating speed of the fans to meet the air volume requirement.

The fresh air heater comprises a heat pump condenser, and fresh air treated by the fresh air purification part is heated by the heat pump condenser to reach the temperature close to the indoor temperature (about 20 ℃) from the ambient temperature.

The special air source heat pump mainly comprises an evaporator, a condenser, a compressor, a working medium pipe system and accessories, and heat transfer between exhaust air and fresh air is realized by adopting a mode of split arrangement of the condenser and a host machine.

The heat pump condenser is arranged in a split manner in such a way that the condenser of the heat pump is arranged in a fresh air box of the fresh air purifying and heating unit. The outlet of the air side of the condenser is connected with the air supply pipeline, the inlet of the condenser is communicated with the fresh air purification part, and the inlet and the outlet of the liquid side of the condenser are connected with the copper pipe for the working medium circulating system of the host machine.

The fresh air case is made of heat-insulating and sound-absorbing materials, a fresh air purifier and a fresh air heater are installed in the case, and the case body is hung on an outer wall outside a room window, so that the filter material of the fresh air purifying part can be replaced conveniently. The tripe air inlet valve is equipped with to the new trend import side, is in the closed condition when the new trend system does not operate, isolated external and indoor passageway, and supply-air duct and air outlet are equipped with to the new trend outlet side.

The special air source heat pump unit is fixedly arranged on the outer side of a wall opposite to the fresh air tank, the indoor side wall is provided with an air outlet of a shutter, and the air outlet is connected with the air inlet side of the air source heat pump evaporator through an air exhaust channel. Indoor polluted air enters the heat pump evaporator through the air exhaust duct, and is discharged into the atmosphere after being cooled to 15 ℃. The heat in the air is absorbed by the working medium in the evaporator, the temperature of the working medium is raised by the compressor, the heat is transferred to the condenser through the fluorine pipe, and the fresh air is heated by the condenser, so that the fresh air is close to the indoor room temperature. Considering that the temperature is lowered in extreme weather, the temperature of the fresh air is still lower than the room temperature after being heated, and an electric heating heat supplementing device can be installed.

The utility model discloses an application scope is very extensive, can be used to the building in other fields including the classroom, and little to a room big to a building, all can exert beneficial effect on obtaining best environment, economy, energy-conserving benefit basis.

The utility model has the advantages and the beneficial effects that:

the utility model discloses not only can accomplish that the index such as fresh air volume, air quality, noise, indoor temperature, energy-conservation all reach national standard, can also accomplish the air replacement of corridor, lavatory simultaneously, do not compete the space with the classroom, do not influence the classroom pleasing to the eye, construction and running cost are low, and social economic environmental benefit is good.

1. The utility model discloses thoroughly solved the serious not enough and indoor air quality, the noise etc. that bring from this of the fresh air volume and exceeded national standard's problem.

The utility model discloses a new trend system is established in a plurality of classrooms, and every classroom only remains the new trend purification heating (refrigeration) unit of getting wind nearby, with the new trend heat recovery unit setting outside the window of lavatory, corridor. The equipment in the classroom reduces the volume and reduces, but can provide the fresh air volume that surpasss present new trend system several times, still can provide bigger fresh air volume according to the demand.

2. The utility model discloses the core technology is organically combined special air source heat pump technique and clean new trend technique, has realized the effect that current new trend system is difficult to reach.

(1) The utility model adopts a new energy technology with energy-saving benefit-a special air source heat pump technology, can completely recover the heat carried by exhaust, and compared with the heat recovery efficiency of less than 50 percent of the prior fresh air system, the heat recovery efficiency can reach 100 percent;

(2) the special heat pump system of the utility model can conveniently use the recovered heat energy to heat the fresh air to compensate the indoor temperature, replace the traditional direct electric heating, and save 70 percent of energy according to the COP value calculation;

(3) the utility model only keeps the fresh air purifying and heating unit in the classroom and replaces the indoor air by a through mode, thereby solving the problem that the units of the existing fresh air system are restricted from influencing each other and thoroughly eliminating the problems of air mixing, air cross, air leakage, short circuit and the like which influence the replacement efficiency;

(4) the utility model discloses also replace corridor, lavatory air in the lump when accomplishing the replacement of classroom air. And during the heating and air-conditioning refrigeration period, the air exhaust of the classroom can replace heating and air-conditioning refrigeration facilities of corridors and toilets, so that the energy is saved.

Description of the drawings:

fig. 1-3 are schematic diagrams of an embodiment of a special air source heat pump matched with an 8-room classroom, wherein a fresh air purification heating unit, an exhaust air heat recovery unit and a working medium circulating pipeline are arranged outdoors.

In the figure, 1 is a fresh air purifying and heating unit, 2 is an air supply pipeline, 3 is an air supply outlet, 4 is a liquid working medium circulating pipeline, 5 is an outlet shutter, 6 is an exhaust pipeline, 7 is an exhaust heat recovery unit, and 8 is a special air source heat pump.

Fig. 4-6 are schematic diagrams of an embodiment of a special air source heat pump matched with an 8-room classroom, wherein a fresh air purification heating unit, an exhaust air heat recovery unit and a working medium circulating pipeline are all installed indoors.

In the figure, a fresh air purifying and heating unit 1, an air inlet pipeline 2, an air outlet 3, a liquid working medium circulating pipeline 4, an outlet shutter 5, an exhaust duct 6, an exhaust heat recovery unit 7 and a special air source heat pump 8.

Fig. 7-8 are schematic diagrams of an embodiment of two special air source heat pumps matched with a meeting place with 500 seats, wherein a fresh air purification heating unit and a working medium circulation pipeline are both arranged indoors, and an exhaust heat recovery unit is arranged outdoors.

In the figure, a fresh air purifying and heating unit 1, an air inlet pipeline 2, an air outlet pipeline 3, an air outlet 4, a working medium circulating pipeline 5, an exhaust duct 6 and a special air source heat pump 8.

The specific implementation mode is as follows:

in order to make the technical content, innovative characteristics, objectives and functions of the present invention better understood by those skilled in the art, the following method of implementing the present invention will be further elaborated with reference to the following embodiments and drawings, wherein the following embodiments are only preferred embodiments of the present invention, but not all of them, and the scope of protection of the present invention is not limited by the embodiments

Example 1:

the embodiment is an embodiment of an 8-room classroom matched special air source heat pump, and a fresh air purification heating unit, an exhaust heat recovery unit and a working medium circulating pipeline are all installed outdoors.

As shown in fig. 1-3, the technical scheme of the utility model is to design a big wind volume replacement formula new trend system based on air source heat pump total heat recovery, include: the system comprises a fresh air purification heating unit 1, an air supply pipeline 2, an air supply outlet 3, a liquid working medium circulating pipeline 4, an outlet shutter 5, an exhaust duct 6, an exhaust heat recovery unit 7 and a special air source heat pump 8.

Outdoor fresh air (fresh air) enters the fresh air purification heating unit 1, enters an air volume distribution channel of a fresh air purification part firstly, then sequentially passes through the coarse filter layer, the pretreatment filter layer, the gas purification layer and the pm2.5 filter layer, and the processed clean fresh air is sent into the heating part by the fan and then is sent into the room through the air supply pipeline and the air supply outlet 4. The fresh air is heated by the finned tube heat exchanger of the fresh air heating part, the temperature is raised by about 15 ℃ from the environmental temperature (5 ℃ under the standard working condition), the temperature is close to the indoor temperature (20 ℃), and the fresh air enters the air supply pipeline 2 and the air outlet 3 and is diffused indoors.

And one end of the air supply pipeline 2 is connected with the fresh air heating part, the other end of the air supply pipeline penetrates through a wall to be connected with an air outlet 3, and the air outlet 3 consists of a pressure equalizing box and an air outlet adjusting orifice plate.

The pressure equalizing box is made of heat insulating materials, and the cross section of the pressure equalizing box is rectangular, triangular or trapezoidal; oval air outlet holes are uniformly distributed on the surface, a movable stainless steel air outlet adjusting pore plate is attached to the surface of the air outlet adjusting pore plate, oval air outlet holes are distributed in the air outlet adjusting pore plate, and the air outlet amount is adjusted by changing the position to convey fresh air indoors. The room is in a micro-positive pressure state.

The outlet shutter 5 is a shutter arranged above the wall opposite to the fresh air inlet, and dirty air at the upper part of the room enters the corridor through the shutter 5 under the action of fresh air micro-positive pressure, so that indoor air flow and updating are realized. The window leaf of shutter 5 relies on gravity to close when the new trend system does not operate, prevents that mosquito, dust from getting into.

The exhaust heat recovery unit 7 is composed of an exhaust duct 6 and a special air source heat pump unit 8, the unit 8 is installed and fixed outside a lighting window at the end part of the corridor, and the window is connected with an air inlet of an air source heat pump evaporator through the exhaust duct 6. The discharged air (about 20 ℃) exchanged from the indoor to the corridor enters the heat pump evaporator through the air exhaust duct 6, and is discharged into the atmosphere after being cooled by 15 ℃. The heat in the air is absorbed by the working medium in the evaporator, is heated and transferred to the condenser through the compressor, the circulating working medium of the system is heated to 60 ℃ through the condenser, and enters the finned tube heat exchanger through the liquid working medium circulating pipeline 4 to heat the fresh air, so that the fresh air is close to the indoor room temperature.

The matching quantity of the special air source heat pumps 8 is set in a balanced way according to the total air exhaust quantity of a room provided with a fresh air facility on the floor and the air intake quantity of a heat pump evaporator. In the embodiment, the fresh air volume of a single classroom is 700 cubic meters per hour, the number of classrooms on the floor is 8, and the air volume of a fan of the matched air source heat pump is 6000 cubic meters per hour in consideration of wind resistance.

The liquid working medium circulating pipeline 4 comprises a circulating pump connected with a heat pump condenser, a pipeline for entering and exiting the liquid circulating system, a valve and the like. The circulating pump is installed in the heat pump unit, and all pipelines and valves need to be insulated and provided with heat tracing bands to prevent the system from freezing when the system stops running. In severe cold areas, antifreeze can be added into the circulating liquid. The heat pump system is provided with an automatic anti-freezing system.

The embodiment has the characteristics that:

1. except for installing the air supply pipe and the air supply outlet and additionally installing the outlet shutter, other parts and equipment are installed outdoors in a classroom of the fresh air system, and indoor decoration is not damaged.

2. The adjustable air outlet is arranged on the pressure equalizing box, so that the air outlet speed can be reduced, the full-section through replacement of a classroom is realized, and the aim of basically having no wind sensation is achieved.

3. The air inlet and exhaust fans of the fresh air system are arranged outdoors, so that the interference of noise to the indoor is reduced to the maximum extent.

4. The filter material of fresh air purification unit's change accessible window carries out the operation, has guaranteed personnel's operation safety.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements can be made without departing from the technical principle of the present invention, and these improvements should also be regarded as the protection scope of the present invention.

Example 2:

the embodiment is an embodiment of an 8-room classroom matched special air source heat pump, and a fresh air purification heating unit, an exhaust heat recovery unit and a working medium circulating pipeline are all installed indoors.

As shown in fig. 4-6, the technical scheme of the utility model is to design a big air volume replacement formula new trend system based on air source heat pump total heat recovery, including new trend purification heating unit 1, supply-air outlet 3, liquid working medium circulating line 4, export shutter 5, exhaust duct 6, the heat recovery unit 7 of airing exhaust, special air source heat pump 8.

The machine case of the fresh air purifying and heating unit 1 is placed on the ground in the front and at the back of the classroom without shielding the window. The air inlet 2 is arranged on an opening of an outer wall or a window and is connected with the case interface of the fresh air purifying and heating unit 1 through a pipeline. The outlet shutter 5 is arranged at the opposite angle of the fresh air purifying and heating unit 1, namely the lower part of the front door and the rear door, and the mode of reserving the air exhaust height at the lower part of the shutter or the door curtain can be adopted. The classroom is aired exhaust and is got into the heat recovery unit 7 of airing exhaust through the corridor and is retrieved the heat, then discharges to outdoor, retrieves the heat simultaneously and passes through liquid working medium circulating line 4 with the fin heat exchanger of new trend purification heating unit 1 with the hot water form and be connected for heating the new trend.

Fresh air purification heating unit 1 fresh air purification part include amount of wind distribution passageway, coarse filtration layer, preliminary treatment filter layer, gaseous purification layer, pm2.5 filter layer, draught fan and quick-witted case. Outdoor new trend is earlier through amount of wind distribution passageway, then loops through coarse filtration net, preliminary treatment filter screen, gaseous purification layer and pm2.5 filter screen, then sends into the heating part with the clean new trend of handling by the fan, then sends into indoor through supply-air outlet 3. The clean fresh air is heated by the finned tube heat exchanger of the heating part, and is heated to about 15 ℃ from the environmental temperature (5 ℃ under the standard working condition), is close to the indoor temperature (20 ℃), and enters the air outlet 3 to be diffused indoors.

Fresh air purification part and fresh air heating part combination stack perpendicularly, through sealing strip and gravity seal, the combination falls to the ground or the hanging is placed, fresh air heating part upper portion sets up clean fresh air distributing plate.

The outlet shutter 5 is a shutter or a door curtain at the lower part of the door, and indoor air flow and update are realized under the action of fresh air micro-positive pressure and corridor micro-negative pressure. The shutter or the door curtain is closed by gravity or manually when the fresh air system does not operate, so that mosquitoes and dust are prevented from entering a room.

The exhaust heat recovery unit 7 is composed of an exhaust air duct 6 and a special air source heat pump unit 8, the unit 8 is installed and fixed inside a lighting window at the end part of the corridor, and the window is connected with an air outlet of the air source heat pump evaporator through the exhaust air duct 6. Polluted air (about 20 ℃) exchanged from indoor to corridor passes through a heat pump evaporator, is cooled by 15 ℃ and then is discharged into the atmosphere.

The matching quantity of the special air source heat pumps 8 is set in a balanced way according to the total air exhaust quantity of a room provided with a fresh air facility on the floor and the air intake quantity of a heat pump evaporator.

The liquid working medium circulating pipeline 5 comprises a circulating pump connected with the heat pump condenser, a liquid working medium inlet and outlet circulating pipeline, a valve and other pipe fittings, and the circulating pump is arranged in or outside the heat pump unit. If the system is placed in an environment with the temperature lower than 5 ℃, all pipelines and valves need to be insulated and provided with heat tracing bands, so that the system is prevented from being frozen when the system stops running. In severe cold areas, antifreeze can be added into the circulating water. The heat pump system is provided with an automatic anti-freezing system.

The embodiment has the characteristics that:

1. except that the air inlet and the air outlet of the fresh air system are arranged outdoors, other devices are arranged indoors.

2. The adjustable wind shield is adopted, so that the wind speed can be reduced, the full-section through ventilation of a classroom is realized, and no wind sensation is achieved.

3. This new trend system adopts the combination mode of low noise multi-fan, and furthest reduction noise is to indoor interference.

4. The filtration and purification material of the fresh air purification part can be replaced very conveniently and rapidly, and the safety is ensured.

Example 3:

the embodiment is an embodiment of a meeting place with 500 seats and two special air source heat pumps, wherein a fresh air purification heating unit and a working medium circulating pipeline are both arranged indoors, and an exhaust heat recovery unit is arranged outdoors.

As shown in figures 7-8, the technical scheme of the utility model is to design a big air volume replacement formula new trend system based on air source heat pump total heat recovery, including new trend purification heating unit 1, intake stack 2, air-out pipeline 3, air outlet 4, working medium circulating line 5, exhaust duct 6, special air source heat pump 8

The machine case of new trend purification heating unit 1 fall to the ground and place or the hanging is indoor at the backstage, intake stack 2 is installed on passing outer wall or window trompil, with 1 quick-witted case interface connection of new trend purification heating unit. The treated and heated fresh air is diffused into the room through the air outlet pipeline 3 and the air outlet 4.

The special air source heat pump 8 is installed outside a window at the rear of a meeting place, an inlet of a heat pump evaporator is connected with the window through an exhaust duct 6, indoor air enters the heat pump evaporator through the exhaust duct, heat in the exhaust air is recovered and then is exhausted outdoors, and meanwhile the recovered heat is connected with a fin heat exchanger of a heating part of the fresh air purification heating unit 1 through a working medium circulating pipeline 5 in a hot water mode to heat fresh air.

The matching quantity of the special air source heat pumps 8 is balanced according to the fresh air demand of the meeting place and the exhaust air quantity of the heat pump evaporator. The heat energy recovered from the discharge of the air source heat pump is used for heating the entering fresh air, so even if a large amount of fresh air enters, the heat energy can still keep balance, and the indoor temperature cannot be reduced.

The embodiment has the characteristics that:

1. the fresh air purifying and heating unit of the fresh air system is installed indoors, and the special air source heat pump is installed outdoors.

2. The heat energy in the exhaust air is recycled by the air source heat pump to heat the fresh air, so that the balance of air quantity and heat and the stability of room temperature are realized.

3. Through the arrangement of the fresh air outlet and the heat pump air exhaust, large air volume replacement can be realized, and the ventilation problem of closed occasions with more personnel is solved.

Claims

1. A large-air-volume replacement type fresh air system based on air source heat pump total heat recovery is characterized by comprising a fresh air purification heating unit, an exhaust heat recovery unit and a liquid working medium circulating system;

the fresh air purifying and heating unit comprises a fresh air purifier and a fresh air heater and is arranged in a fresh air case; the fresh air purifier comprises an air volume distribution channel, a coarse filter layer, a pretreatment filter layer, a gas purification layer, a pm2.5 filter layer, an induced draft fan and a case; the fresh air heater comprises a finned tube heat exchanger, the finned tube heat exchanger is a gas-liquid heat exchanger, and a liquid side inlet and a liquid side outlet are connected with a pipeline of the liquid working medium circulating system;

the fresh air case is made of heat-insulating and sound-absorbing materials, a fresh air purifier and a fresh air heater are installed in the case, the case body is hung on an outer wall outside a classroom window, a shutter air inlet valve is installed on a fresh air inlet side, and an air supply pipeline and an air outlet are installed on a fresh air outlet side.

2. The large-air-volume replacement type fresh air system based on the total heat recovery of the air source heat pump as claimed in claim 1, wherein one end of the air supply pipeline is connected with a fresh air cabinet, the other end of the air supply pipeline penetrates through a wall to be connected with an air outlet, and the air outlet is composed of a pressure equalizing box and an air outlet adjusting orifice plate;

the pressure equalizing box is made of sound absorbing materials, and the cross section of the pressure equalizing box is one of a semicircle, a rectangle, a triangle and a trapezoid; oval air outlet holes are uniformly distributed on the surface, a movable stainless steel air outlet adjusting pore plate is attached to the surface of the air outlet adjusting pore plate, oval air outlet holes are distributed in the air outlet adjusting pore plate, and the air outlet amount is adjusted by changing the position to convey fresh air indoors.

3. The large-air-volume replacement type fresh air system based on air source heat pump total heat recovery according to claim 1, wherein the exhaust air heat recovery unit is composed of an exhaust air duct and a special air source heat pump unit;

the special air source heat pump unit is fixedly arranged outside a lighting window at the end part of the corridor, and the window is connected with an air inlet of the air source heat pump evaporator through an air exhaust duct.

4. The large-air-volume replacement type fresh air system based on air source heat pump total heat recovery according to claim 1, wherein the exhaust air heat recovery unit is composed of an exhaust air duct and a special air source heat pump unit;

the special air source heat pump unit can be installed and fixed in the lighting window at the end part of the corridor.

5. The large-air-volume replacement type fresh air system based on the total heat recovery of the air source heat pump as claimed in claim 1, wherein the liquid working medium circulating system comprises a circulating pump connected with a condenser of the heat pump, and a pipeline and a valve of the water inlet and outlet circulating system.

6. The large-air-volume replacement type fresh air system based on air source heat pump total heat recovery according to claim 1, characterized in that the exhaust heat recovery unit adopts a mode that a condenser of a special air source heat pump and a host machine are separately arranged, a heat pump condenser is installed in a fresh air box to directly heat fresh air, an outlet of an air side of the condenser is connected with an air supply pipeline, an inlet of the air side of the condenser is communicated with a fresh air purification part, and an inlet and an outlet of a liquid side of the condenser are connected with a working medium circulating system of the host machine through copper pipes.