CN108286755A - A kind of air-treatment unit of included low-temperature receiver - Google Patents

Abstract

The invention discloses an air handling unit with its own cold source, which is provided with an air conditioning unit cabinet and an exhaust heat exchange box. The air conditioning unit cabinet is provided with a fresh air inlet, an air outlet and a return air outlet. A first filter, a first air heat exchanger, a centrifugal fan, a second filter, a second air heat exchanger and a humidifier are installed sequentially in the air flow direction from the air inlet to the air outlet; the exhaust heat exchange box is equipped with The exhaust air inlet and the exhaust air outlet are equipped with a third air heat exchanger, a compressor, a four-way reversing valve and an exhaust fan. The invention has its own independent cold source, flexible installation and layout, and utilizes the waste heat of the indoor exhaust air to greatly improve the energy efficiency of the self-contained cold source, and utilizes the condensation heat of the self-contained cold source to realize the regulation of the air supply temperature. The present invention is suitable for It is not easy to set up a centralized cold source, especially suitable for villas, hotel rooms, high-end office buildings and other places, which can meet the user's requirements for fresh air and thermal comfort throughout the year.

Description

An air handling unit with its own cooling source

technical field

The invention relates to an air handling unit with a self-contained cold source.

Background technique

With the development of society and the improvement of people's living standards, people's requirements for living and working environments are getting higher and higher, especially the demand for fresh air and thermal comfort is getting more and more attention. At present, for living and working places such as villas, hotel rooms, and high-end office buildings, split air conditioners or multi-line air conditioners are usually used when it is not easy to install centralized water-cooled cold sources. However, these air-conditioning systems usually have the following disadvantages: ① Air conditioners The system cannot provide fresh air, and usually relies on opening doors and windows for natural ventilation or simple mechanical ventilation to obtain fresh air. This will not only cause the loss of cooling capacity of the air conditioner, but also increase the energy consumption of the air conditioner, and the fresh air will directly enter the room without treatment. It will bring outdoor pollutants (such as dust, car exhaust, PM2.5, etc.) and noise into the room. Moreover, in the humid season in the southern region, a large amount of uncontrolled and untreated fresh air enters the room, which will aggravate the indoor moisture resurgence. moldy phenomenon; ②If an independent fresh air system is installed, an air conditioning system needs to be added, which not only increases the initial investment, but also needs to set up a special fresh air room and reserve space for air duct layout; A lot of indoor waste heat is wasted.

The above-mentioned disadvantages have affected to a certain extent the quality of fresh air and thermal comfort in places such as villas, hotel rooms, and high-end office buildings. Therefore, it is necessary to design a suitable air treatment system to meet the needs of these places.

Contents of the invention

The technical problem to be solved by the present invention is to provide an air handling unit with its own cooling source.

To solve the problems of the technologies described above, the technical scheme adopted in the present invention is as follows:

An air handling unit with a self-contained cold source, which is provided with an air conditioning unit cabinet and an exhaust heat exchange box. The air conditioning unit cabinet is provided with a fresh air inlet, an air outlet and a return air outlet. The fresh air inlet is used for The outdoor environment is connected with the inside of the cabinet of the air conditioner, the air outlet is used to connect the indoor environment with the inside of the cabinet of the air conditioner, and the exhaust heat exchange box is provided with an exhaust air inlet and an exhaust air outlet. The air outlet, the exhaust air inlet is used to connect the indoor environment with the inside of the exhaust heat exchange box, and the exhaust air outlet is used to communicate with the outdoor environment and the inside of the exhaust heat exchange box, It is characterized by:

The inside of the cabinet of the air conditioner is sequentially installed with a first filter, a first air heat exchanger, a centrifugal fan, a second filter, and a second air flow direction in accordance with the air flow direction from the fresh air inlet to the air outlet. A heat exchanger and a humidifier, the air return port communicates with the indoor environment and the first filtering position inside the cabinet of the air conditioning unit, and the first filtering position is located between the first filter and the first air heat exchanger between;

A third air heat exchanger, a compressor, a four-way reversing valve and an exhaust fan are installed inside the exhaust air heat exchange box, and the air outlet of the exhaust fan is connected to the exhaust air outlet;

The outlet of the compressor is connected to the a port of the four-way reversing valve, the inlet of the compressor is connected to the d port of the four-way reversing valve, and the b port of the four-way reversing valve is divided into two branches The first branch is connected to the a port of the third air heat exchanger, the second branch is connected to the a port of the second air heat exchanger through the first solenoid valve, and the c port of the four-way reversing valve is The interface is connected to the b interface of the first air heat exchanger, the a interface of the first air heat exchanger is connected to the first interface of the first electronic expansion valve, and the second interface of the first electronic expansion valve is divided into two The first branch is connected to the b-port of the third air heat exchanger through the second electronic expansion valve, and the second branch is connected to the b-port of the second air heat exchanger through the second electromagnetic valve.

As a preferred embodiment of the present invention: in the two branches separated by the b interface of the four-way reversing valve, the first branch is connected to the a of the third air heat exchanger through the third solenoid valve interface.

As a preferred embodiment of the present invention: the fresh air inlet is equipped with a first electric regulating damper, the air outlet is equipped with a second electric regulating damper, and the air return port is equipped with a third electric regulating damper; The exhaust air inlet is equipped with a fourth electric regulating air valve.

As a preferred embodiment of the present invention: inside the exhaust air heat exchange box, the third air heat exchanger is located at a position upwind of the compressor.

As a preferred embodiment of the present invention: the compressor is a frequency conversion compressor; the centrifugal fan is a frequency conversion fan; and the exhaust fan is a centrifugal fan.

Compared with the prior art, the present invention has the following beneficial effects:

First, the present invention adopts the air-conditioning unit that is made up of air-conditioning unit cabinet, the first filter, the first air heat exchanger, the centrifugal fan, the second filter, the second air heat exchanger and the humidifier, and adopts the The exhaust air heat exchange box is composed of the air heat exchange box, the third air heat exchanger, the compressor, the four-way reversing valve and the exhaust fan, and the air conditioning unit is combined with the exhaust air heat exchange box, so that the combination formed The air handling unit can work in four working modes through the direction switching of the four-way reversing valve, so that users can reasonably choose cooling, heating, dehumidification, and fresh air operating modes in different climates. Therefore, the present invention not only It can meet the user's demand for fresh air and thermal comfort throughout the year, and can achieve the purpose of energy-saving operation.

Second, the present invention has its own independent cold source and does not need an external cold source, forming a complete air-conditioning system, with flexible installation and arrangement, and strong applicability.

Third, the exhaust air heat exchange box adopted in the present invention can make full use of the waste heat of the indoor exhaust air. In the cooling mode, it is used to reduce the condensation temperature of the self-contained cold source. The evaporating temperature can greatly improve the energy efficiency of the self-contained cold source and realize energy-saving operation.

Fourth, the present invention sets up a second air heat exchanger, which replaces the electric heating, not only can utilize the condensation heat of the self-contained cold source, realize the heating and regulation of the air supply temperature, ensure that the air supply meets the requirements, but also avoid hot and cold Offset energy waste. At the same time, the present invention adopts the form of direct evaporative cooling and dehumidification, which has stronger cooling and dehumidification ability and better dehumidification effect than cold water coils, and can meet the dehumidification and non-cooling operation requirements of the "returning to the south" season in the southern region.

Fifth, the present invention is equipped with a plurality of electric regulating air valves, which can flexibly adjust the proportion of fresh return air and the air supply volume, especially in transitional seasons, can realize the operation of fresh air, and at the same time, adopt frequency conversion centrifugal fans and frequency conversion compressors to The terminal load changes, and the operating status of the unit is adjusted in a timely manner, so as to achieve the purpose of energy-saving operation to the maximum extent while ensuring indoor health and comfort.

Description of drawings

Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

Fig. 1 is a structural schematic diagram of the present invention.

Fig. 2 is a schematic diagram of the system of the present invention.

Detailed ways

As shown in Figure 1 and Figure 2, what the present invention discloses is an air handling unit with its own cold source, which is provided with an air conditioning unit cabinet 14 and an exhaust heat exchange box 13; the air conditioning unit cabinet 14 is provided with a fresh air inlet The air outlet 18, the air outlet 19 and the return air outlet 16, the fresh air inlet 18 are used to communicate with the outdoor environment and the inside of the air-conditioning unit cabinet 14, and the air outlet 19 is used to communicate with the indoor environment and the inside of the air-conditioning unit cabinet 14; exhaust heat exchange The casing 13 is provided with an exhaust air inlet 15 and an exhaust air outlet 17. The exhaust air inlet 15 is used to communicate with the interior of the indoor environment and the exhaust heat exchange box 13, and the exhaust air outlet 17 is used to communicate with the outdoor environment and the exhaust air. The inside of the air heat exchange box 13.

The inventive concept of the present invention is:

The inside of the air conditioner cabinet body 14 is sequentially equipped with a first filter 24, a first air heat exchanger 10, a centrifugal fan 11, a second filter 25, a second The air heat exchanger 12 and the humidifier 26 , the air return port 16 communicates with the indoor environment and the first filter position inside the air conditioner cabinet 14 , the first filter position is located between the first filter 24 and the first air heat exchanger 10 Make the outdoor fresh air A entering the air-conditioning unit cabinet 14 through the fresh air inlet 18, after being filtered by the first filter 24, mix with the indoor air C from the air return port 16, and then the mixed air passes through the first air heat exchange successively After the device 10, the centrifugal fan 11, the second filter 25, the second air heat exchanger 12 and the humidifier 26, the mixed wind B is blown out from the air outlet 19.

A third air heat exchanger 5, a compressor 1, a four-way reversing valve 2 and an exhaust fan 9 are installed inside the exhaust heat exchange box body 13, and the air outlet of the exhaust fan 9 is connected to the exhaust air outlet 17; The indoor air D that enters the exhaust heat exchange box 13 through the air inlet 15 passes through the third air heat exchanger 5, the four-way reversing valve 2, the compressor 1 and the exhaust fan 9 in sequence, and then becomes the exhaust air E, and then flows from the exhaust air. Air outlet 19 blows out. Wherein, the third air heat exchanger 5 is preferably located at the windward position of the compressor 1 .

The outlet of compressor 1 is connected to port a of four-way reversing valve 2, the inlet of compressor 1 is connected to port d of four-way reversing valve 2, and the port b of four-way reversing valve 2 is divided into two branches. The second branch is connected to the a port of the second air heat exchanger 12 through the first solenoid valve 3, and the c port of the four-way reversing valve 2 is connected to the first air heat exchanger. b interface of the device 10, the a interface of the first air heat exchanger 10 is connected to the first interface of the first electronic expansion valve 7, the second interface of the first electronic expansion valve 7 is divided into two branches, the first branch passes through the first The second electronic expansion valve 6 is connected to the port b of the third air heat exchanger 5 , and the second branch is connected to the port b of the second air heat exchanger 12 through the second solenoid valve 8 .

Preferably, the first electronic expansion valve 7 is preferably installed close to the port a of the first air heat exchanger 10 ; the second electronic expansion valve 6 is preferably installed close to the port b of the third air heat exchanger 5 .

Preferably, among the two branches separated by the port b of the four-way reversing valve 2 , the first branch is connected to the port a of the third air heat exchanger 5 through the third electromagnetic valve 4 . Wherein, it is advisable that the third electromagnetic valve 4 is installed close to the interface a of the third air heat exchanger 5 .

The working mode of the present invention is as follows:

Working mode 1: when cooling is required, for example in hot summer, the present invention starts the cooling mode, the compressor 1 is started, the humidifier 26 is turned off, the a port of the four-way reversing valve 2 is connected to the b port, and the c port is connected to the d port , at this time, the first air heat exchanger 10 is used as an evaporator, the second air heat exchanger 12 is used as a heater, and the third air heat exchanger 5 is used as a condenser. The refrigeration cycle of the refrigerant is divided into two paths, the first The route is: compressor 1→four-way reversing valve 2 (port a to port b)→third solenoid valve 4→third air heat exchanger 5→second electronic expansion valve 6→first electronic expansion valve 7→second An air heat exchanger 10 → four-way reversing valve 2 (c port to d port) → compressor 1; the second path is: compressor 1 → four-way reversing valve 2 (a port to b port) → first Solenoid valve 3→second air heat exchanger 12→second solenoid valve 8→first electronic expansion valve 7→first air heat exchanger 10→four-way reversing valve 2 (c port to d port)→compressor 1 .

The working process of the cooling mode of the present invention: the outdoor fresh air A enters the air conditioner cabinet 14 through the fresh air inlet 18, and after being filtered by the first filter 24, it is mixed with the indoor air C from the return air outlet 16 to make relatively clean indoor air C is not filtered by the first filter 24, the mixed air is first cooled and dehumidified by the first air heat exchanger 10 (as an evaporator at this time), then transported by the centrifugal fan 11, filtered by the second filter 25, and then The second air heat exchanger 12 (as a heater at this time) heats up to a suitable temperature and humidity, then flows through the humidifier 26, and finally the mixed air B is sent out from the air outlet 19 to ensure that the air sent into the room meets the fresh air and thermal comfort At the same time, the indoor air D enters the exhaust heat exchange box 13 through the exhaust air inlet 15, and first passes through the third air heat exchanger 5 (at this time as a condenser), so that it flows through the third air heat exchanger The heat of the refrigerant in 5 is exchanged to the indoor air D, that is, the refrigerant flowing through the third air heat exchanger 5 is used for cooling and dehumidification of the first air heat exchanger 10 (as an evaporator at this time), and through the third air heat exchanger 5 The indoor air D of the three-air heat exchanger 5 then heats up, and then the indoor air D after the temperature rise is transported by the exhaust fan 9, and finally the indoor air D after the temperature rise becomes the exhaust air E and is sent to the outdoor environment from the exhaust air outlet 19, completing The condensation heat exchange process of the third air heat exchanger 5 . In this cooling mode, the first electronic expansion valve 7 acts as a throttling; the first solenoid valve 3 and the second solenoid valve 8 are also used to adjust the flow of refrigerant flowing through the second air heat exchanger 12, thereby regulating the first The heating capacity of the two air heat exchangers 12 to the mixed air.

Working mode two: when heating is required, such as in cold winter, the present invention starts the heating mode, the compressor 1 is started, the first electromagnetic valve 3 and the second electromagnetic valve 8 are closed, and the a interface of the four-way reversing valve 2 is connected to the The c interface is connected, and the b interface is connected with the d interface. At this time, the first air heat exchanger 10 is used as a condenser, the second air heat exchanger 12 is not working, and the third air heat exchanger 5 is used as an evaporator. The heat cycle process is: compressor 1→four-way reversing valve 2 (a interface to c interface)→first air heat exchanger 10→first electronic expansion valve 7→second electronic expansion valve 6→third air heat exchange Device 5 → third solenoid valve 4 → four-way reversing valve 2 (port b to port d) → compressor 1.

The working process of the heating mode of the present invention: the outdoor fresh air A enters the air conditioner cabinet 14 through the fresh air inlet 18, and after being filtered by the first filter 24, it is mixed with the indoor air C from the return air outlet 16, and the mixed air is first Heated by the first air heat exchanger 10 (as a condenser at this time), then transported by the centrifugal fan 11, filtered by the second filter 25, and then flows through the second air heat exchanger 12 (not working at this time) , and then humidified by the humidifier 26, and finally the mixed air B is sent out from the air outlet 19 to ensure that the air sent into the room meets the requirements of fresh air and thermal comfort; at the same time, the indoor air D enters the exhaust air heat exchange box through the exhaust air inlet 15 13, it first passes through the third air heat exchanger 5 (at this time as an evaporator), so that the heat of the indoor air D is exchanged to the refrigerant flowing through the third air heat exchanger 5, that is, it flows through the third air heat exchanger The temperature of the refrigerant in 5 is used to heat up the first air heat exchanger 10 (which is used as a condenser at this time), and the indoor air D passing through the third air heat exchanger 5 is cooled, and then the cooled indoor air D is cooled again. Transported by the exhaust fan 9, the finally cooled indoor air D becomes the exhaust air E and is sent to the outdoor environment from the exhaust air outlet 19 to complete the evaporative heat exchange process of the third air heat exchanger 5. In this heating mode, the second electronic expansion valve 6 plays a throttling role.

Working mode 3: When dehumidification is required, for example, in the season of "returning to the south" in the southern region, the present invention starts the dehumidification mode, the compressor 1 is started, the humidifier 26 is turned off, the a port of the four-way reversing valve 2 is connected to the b port, c The interface communicates with the d interface. At this time, the first air heat exchanger 10 is used as an evaporator, the second air heat exchanger 12 is used as a heater, and the third air heat exchanger 5 is used as a condenser. The dehumidification circulation process of the refrigerant and The working process is the same as the cooling mode, and only needs to be realized by controlling the evaporation temperature and cooling capacity of the first air heat exchanger 10 and the heating capacity of the second air heat exchanger 12 .

Working mode 4: when the fresh air is running, for example, in periods other than the above-mentioned seasons, there is no need for cooling, heating and dehumidification, so the compressor 1 and the electric regulating damper 21 are turned off.

The working process of the fresh air operation of the present invention: the outdoor fresh air A enters the air conditioner cabinet 14 through the fresh air inlet 18, is first filtered by the first filter 24, and then flows through the first air heat exchanger 10 (not working at this time) , then transported by the centrifugal fan 11, then filtered by the second filter 25, then flow through the second air heat exchanger 12 (not working at this time) and the humidifier 26, and finally sent out from the air outlet 19 to obtain clean fresh air B , to ensure that the fresh air sent into the room meets the requirements; at the same time, the indoor air D enters the exhaust heat exchange box 13 through the exhaust air inlet 15, and passes through the third air heat exchanger 5 (not working at this time), the four-way exchange To the valve 2 and the compressor 1, then sent by the exhaust fan 9, and finally the exhaust air E is sent out from the exhaust air outlet 19.

Wherein, the second air heat exchanger 12 is connected in parallel with the third air heat exchanger 5, so that when the present invention is in cooling mode, the second air heat exchanger 12 can reasonably use the condensation heat of its own cold source to heat the air. Both the second air heat exchanger 12 and the third air heat exchanger 5 are connected in series with the first air heat exchanger 10, so that the cooling and heating loops are reasonably combined.

It should be noted that the above-mentioned third solenoid valve 4 is used to adjust the flow rate of the refrigerant flowing through the third air heat exchanger 5, so as to regulate the heat dissipation of the third air heat exchanger 5 and assist in the regulation of the second air heat exchanger. 12 For the heating capacity of the mixed wind, the present invention may not be provided with the third electromagnetic valve 4, which does not affect the realization of the above four groups of working modes in the present invention.

On the basis of above-mentioned inventive idea, the present invention adopts following preferred structure:

As a preferred embodiment of the present invention: the fresh air inlet 18 is equipped with a first electric regulating damper 22, which can adjust the air volume of the outdoor fresh air A entering the air conditioner cabinet 14 from the fresh air inlet 18, and the air outlet 19 is equipped with a second The electric regulating air valve 23 can adjust the air volume of the mixed air B sent from the air outlet 19, and the return air port 16 is equipped with a third electric regulating air valve 21, which can adjust the indoor air C entering the air conditioning unit cabinet 14 from the return air port 16. The air volume; the exhaust air inlet 15 is equipped with a fourth electric regulating air valve 20, which can adjust the air volume of the indoor air D entering the exhaust air heat exchange box 13 from the exhaust air inlet 15.

As a preferred embodiment of the present invention: inside the exhaust air heat exchange box 13, the third air heat exchanger 5 is located at the windward position of the compressor 1, and in the cooling mode, it is avoided that the compressor 1 dissipates heat and exchanges heat with the third air The influence of the heat exchange effect of the device 5 (the condenser at this time).

As a preferred embodiment of the present invention: the centrifugal fan 11 adopts a variable frequency fan, and the frequency can be adjusted to adjust the air volume of the mixed air B sent from the air outlet 19; The cooling or heating capacity of the source; the exhaust fan is a centrifugal fan to ensure that the exhaust air pressure meets the requirements.

The present invention is not limited to the above-mentioned specific implementation methods. According to the above-mentioned content, according to the common technical knowledge and conventional means in this field, without departing from the above-mentioned basic technical idea of the present invention, the present invention can also make other equivalent forms. Amendments, substitutions or alterations all fall within the protection scope of the present invention.

Claims (5)

1. a kind of air-treatment unit of included low-temperature receiver is equipped with air-conditioner set cabinet (14) and air exhaust heat exchange babinet (13), described Air-conditioner set cabinet (14) is equipped with fresh air air inlet (18), air outlet (19) and return air inlet (16), the fresh air air inlet (18) Inside for being connected to outdoor environment and the air-conditioner set cabinet (14), the air outlet (19) for be connected to indoor environment with The inside of the air-conditioner set cabinet (14), the air exhaust heat exchange babinet (13) are equipped with air draft air inlet (15) and air draft air outlet (17), the air draft air inlet (15) is used to be connected to the inside of the indoor environment and the air exhaust heat exchange babinet (13), described Air draft air outlet (17) is used to be connected to the inside of outdoor environment and the air exhaust heat exchange babinet (13), it is characterised in that：

The inside of the air-conditioner set cabinet (14) is according to the air-flow by the fresh air air inlet (18) to the air outlet (19) Circulating direction is sequentially installed with first filter (24), the first air heat exchanger (10), centrifugal blower (11), the second filter (25), the second air heat exchanger (12) and humidifier (26), the return air inlet (16) are connected to the indoor environment and the air-conditioning The first internal strain position of unit cabinet (14), first strain position are located at the first filter (24) and the first air Between heat exchanger (10)；

The inside of the air exhaust heat exchange babinet (13) is equipped with third air heat exchanger (5), compressor (1), four-way reversing valve (2) The air draft air outlet (17) is connected with the air outlet of exhaust blower (9), the exhaust blower (9)；

The outlet of the compressor (1) connects a interfaces of the four-way reversing valve (2), and the import of the compressor (1) connects institute State the d interfaces of four-way reversing valve (2), the b interfaces of the four-way reversing valve (2) are divided into two branches, first branch connection described the The a interfaces of three air heat exchangers (5), the second branch connect a of second air heat exchanger (12) by the first solenoid valve (3) Interface, the c interfaces of the four-way reversing valve (2) connect the b interfaces of first air heat exchanger (10), and first air changes The a interfaces of hot device (10) connect the first interface of the first electric expansion valve (7), and the second of first electric expansion valve (7) connects Mouth is divided into two branches, and the first branch connects the b interfaces of the third air heat exchanger (5) by the second electric expansion valve (6), the Two branches connect the b interfaces of second air heat exchanger (12) by second solenoid valve (8).

2. the air-treatment unit of included low-temperature receiver according to claim 1, it is characterised in that：In the four-way reversing valve (2) in two branches that b interfaces are separated, the first branch connects the third air heat-exchange by third solenoid valve (4) The a interfaces of device (5).

3. the air-treatment unit of included low-temperature receiver according to claim 1 or 2, it is characterised in that：The fresh air air inlet (18) the first motorized adjustment air-valve (22) is installed, the air outlet (19) is equipped with the second motorized adjustment air-valve (23), described Return air inlet (16) is equipped with third motorized adjustment air-valve (21)；The air draft air inlet (15) is equipped with the 4th motorized adjustment air-valve (20)。

4. the air-treatment unit of included low-temperature receiver according to claim 1 or 2, it is characterised in that：In the air exhaust heat exchange The inside of babinet (13), the third air heat exchanger (5) are located at the weather gage of the compressor (1).

5. the air-treatment unit of included low-temperature receiver according to claim 1 or 2, it is characterised in that：The compressor (1) is Frequency-changeable compressor；The centrifugal blower (11) is frequency conversion fan；The exhaust blower (9) is centrifugal blower.