Secondary air return energy-saving system of clean air conditioner

Abstract

The utility model provides a secondary air return energy-saving system of a clean air conditioner, which comprises an air handling unit, a first air conditioner, a second air conditioner, a second air conditioner, a fan, a heater, a humidifier and a third air conditioner, the fresh air section is arranged at the front end of the air handling unit; the air return section is arranged above the air handling unit and comprises an exhaust pipe, a first air return channel and a second air return channel, the first air return channel and the second air return channel are communicated with the exhaust pipe and are communicated with the air handling unit, the first air return channel is arranged between the first filter and the second filter, and the second air return channel is arranged between the second filter and the second filter. The second air return channel is arranged between the first cooler and the second cooler; and the air supply section is arranged at the rear end of the air handling unit and used for feeding the treated mixed air into a room, and energy consumption can be effectively reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of clean air conditioning secondary return air energy-saving system, applied to energy-saving air conditioning field. BACKGROUND

[0002] Air conditioning secondary return air system is a kind of air handling system, by part of indoor air (return air) and outdoor fresh air are mixed, after processing, to achieve the purpose of adjusting indoor temperature and humidity and air quality.

[0003] Compared with primary return air system, secondary return air system can effectively save energy consumption, but when processing mixed gas, return air can contain air with higher or lower temperature, increase system energy consumption, therefore, to the above problems, the utility model designs a kind of clean air conditioning secondary return air energy-saving system. UTILITY MODEL CONTENTS

[0004] The utility model provides a kind of clean air conditioning secondary return air energy-saving system, can effectively solve the above problems.

[0005] The utility model is realized as follows:

[0006] A kind of clean air conditioning secondary return air energy-saving system, comprising:

[0007] Air handling unit, including first filter, second filter, first cooler, second cooler, fan, heater, humidifier, third filter that are sequentially arranged, the air handling unit is used to process mixed air;

[0008] Fresh air section is arranged at the front end of the air handling unit, and the fresh air section is used to provide outdoor fresh air;

[0009] Return air section is arranged above the air handling unit, and the return air section includes exhaust pipe and first return air passage and second return air passage communicated with exhaust pipe, the first return air passage and second return air passage communicate air handling unit, the first return air passage is arranged between first filter and second filter, the second return air passage is arranged between the first cooler and second cooler, and the first return air passage and second return air passage are used to provide indoor return air;

[0010] Air supply section is arranged at the rear end of air handling unit, and the air supply section is used to send mixed air after processing into indoor.

[0011] As further improvement, when first return air, the ratio D1 between the return air volume of the return air section and the air supply volume of the air supply section is 30-40%, and when second return air, the ratio D2 between the return air volume of the return air section and the air supply volume of the air supply section is 60-70%.

[0012] As a further improvement, the air return quantity ratio between the first air return channel and the exhaust pipe is D3=10-15%.

[0013] As a further improvement, a plurality of first temperature sensors are connected to the first cooler, a plurality of second temperature sensors are connected to the second cooler, and a third temperature sensor is arranged on the heater.

[0014] As a further improvement, a condensate discharge pipe is connected below the first cooler and the second cooler, and the condensate discharge pipe is connected to a floor drain.

[0015] As a further improvement, a live steam condensate collection pipe is connected below the heater and the humidifier, and a trap is arranged on the live steam condensate collection pipe.

[0016] As a further improvement, the fan is electrically connected with an automatic frequency converter.

[0017] The beneficial effects of the present application are as follows: the air in the room is mixed with fresh air by the air return section arranged above the air handling unit, and then the mixed air is sent into the room again, so that the energy consumption can be reduced; the first cooler and the second cooler arranged in the air handling unit can quickly reduce the temperature of the air, and improve the refrigeration efficiency of the air conditioner; the first air return channel is arranged between the first filter and the second filter, and the second air return channel is arranged between the first cooler and the second cooler, so that part of the return air does not need to pass through the first cooler for treatment, and the energy consumption can be reduced while ensuring the rapid cooling of the air. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments, and it should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation to the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0019] Figure 1 is a structural schematic diagram provided by the embodiments of the present application.

[0020] Figure 2 is an energy-saving unit flow schematic diagram provided by the embodiments of the present application.

[0021] The following is the identification of the drawings:

[0022] 10, air handling unit; 11, first filter; 12, second filter; 13, first cooler; 131, first temperature sensor; 132, condensate drain; 14, second cooler; 141, second temperature sensor; 15, fan; 151, automatic frequency converter; 16, heater; 161, third temperature sensor; 162, steam condensate collection; 163, trap; 17, humidifier; 18, third filter;

[0023] 20, fresh air section;

[0024] 30, return air section; 31, exhaust duct; 32, first return air passage; 33, second return air passage;

[0025] 40, supply air section;

[0026] 50, working equipment;

[0027] 60, energy saving unit; 61, electric shut-off valve; 62, variable air volume electric valve; 63, differential pressure interlock; 631, controller; 632, differential pressure sensor. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only to represent selected embodiments of the present application.

[0029] In the description of the present application, the terms "first" and "second" are only used for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0030] Referring to Figure 1 Fig. 1, a clean air conditioning secondary return air energy saving system includes:

[0031] The air handling unit 10 comprises a first filter 11, a second filter 12, a first cooler 13, a second cooler 14, a fan 15, a heater 16, a humidifier 17, and a third filter 18 arranged in sequence, and is used for treating mixed air;

[0032] An outdoor air section 20 is arranged at the front end of the air handling unit 10, and is used for providing outdoor fresh air;

[0033] A return air section 30 is arranged above the air handling unit 10, and comprises an exhaust duct 31, a first return air passage 32 and a second return air passage 33 which are in communication with the exhaust duct 31, the first return air passage 32 and the second return air passage 33 are in communication with the air handling unit 10, the first return air passage 32 is arranged between the first filter 11 and the second filter 12, the second return air passage 33 is arranged between the first cooler 13 and the second cooler 14, and the first return air passage 32 and the second return air passage 33 are used for providing indoor return air;

[0034] A supply air section 40 is arranged at the rear end of the air handling unit 10, and is used for supplying treated mixed air into an indoor space, the indoor space comprises a working device 50 which is in communication with the exhaust duct 31, the working device 50 is in communication with an energy saving unit 60, and the energy saving unit 60 is in communication with the air handling unit 10, and the working device 50 is used for providing a working environment for a user; Figure 2As shown, the energy saving unit 60 includes an electrically controlled valve 61 and a variable air volume electric valve 62 arranged on the exhaust air pipe 31, the electrically controlled valve 61 is electrically connected with the working equipment 50, the variable air volume electric valve 62 is electrically connected with a pressure difference interlock device arranged in the room, the electrically controlled valve 61 is used to control the start / stop of the working equipment 50, the valve of the electrically controlled valve 61 is opened when the equipment is started, and the valve of the electrically controlled valve 61 is closed when the equipment is stopped, the variable air volume electric valve 62 is used to adjust the air volume of the exhaust air pipe 31, the pressure difference interlock device 63 is used to monitor the pressure difference between the room and the atmosphere, the pressure difference interlock device 63 includes a controller 631 and a pressure difference sensor 632 arranged in the room, the controller 631 is electrically connected with the pressure difference sensor 632, the pressure difference sensor 632 is used to monitor the pressure difference between the room and the atmosphere, the controller 631 is used to receive the signal of the pressure difference sensor and control the opening and closing degree of the variable air volume electric valve 62 to achieve the effect of adjusting the air volume, by using the variable air volume electric valve 62 on the exhaust air pipe 31 and the pressure difference interlock device 63 in the room, the pressure difference between the room and the atmosphere can be accurately controlled, through real-time monitoring and feedback control, the system can automatically adjust the exhaust air volume to maintain the set pressure difference value, by using the variable air volume electric valve 62 and the electrically controlled valve 61 on the exhaust air pipe 31, the room air supply volume does not change when the equipment is started and stopped, thereby avoiding the frequent change of the air supply and return air volume of the air conditioning system and the frequent change of the cold and heat source consumption caused by the start and stop of the working equipment, which causes the waste of energy and achieves the effect of energy saving.

[0035] The ratio D1 between the return air volume of the return air section 30 and the supply air volume of the supply air section 40 is 30-40% when the return air is returned for the first time, and the ratio D2 between the return air volume of the return air section 30 and the supply air volume of the supply air section 40 is 60-70% when the return air is returned for the second time, in this embodiment, the ratio D1 between the return air volume of the return air section 30 and the supply air volume of the supply air section 40 is 30% when the return air is returned for the first time, and the ratio D2 between the return air volume of the return air section 30 and the supply air volume of the supply air section 40 is 65% when the return air is returned for the second time, the setting of the supply air ratio can effectively reduce the energy consumption by 15%.

[0036] The ratio D3 between the return air volume of the first return air channel 32 and the exhaust air pipe 31 is 10-15%, in this embodiment, the ratio D3 between the return air volume of the first return air channel 32 and the exhaust air pipe 31 is 15%, that is, 15% of the return air volume flows into the air handling unit 10 from the first return air channel 32, and 85% of the return air volume flows into the air handling unit 10 from the second return air channel 32, the advantage of this setting is that a large amount of return air is arranged between the first cooler 13 and the second cooler 14, the processing time of the first cooler 13 is reduced, and thus the energy consumption is reduced.

[0037] The first cooler 13 is connected with a plurality of first temperature sensors 131, and the second cooler 14 is connected with a plurality of second temperature sensors 141; in the embodiment, the number of the first temperature sensors 131 and the second temperature sensors 141 is two; since a part of the return air enters the first return air passage 32 and another part of the return air enters the second return air passage 33, so that the return air temperature in the two passages is different, therefore, the temperature sensors 131 are additionally arranged to more accurately control the air conditioning temperature; the heater 16 is provided with a third temperature sensor 161; since the air after the return air is mixed with the fresh air and then is heated, the air temperature at the heater 16 changes little, therefore, it is unnecessary to additionally arrange too many temperature sensors, and the cost is effectively saved.

[0038] The first cooler 13 and the second cooler 14 are connected with a condensate water discharge pipeline 132 below, the condensate water discharge pipeline 132 is connected to a floor drain; the heater 16 and the humidifier 17 are connected with a steam condensate water collection pipeline below, the steam condensate water collection pipeline 162 is provided with a trap 163; the trap 163 is usually installed in the pipeline of a steam heating system or an air conditioning system to ensure that the condensate water can be smoothly discharged, and the efficiency reduction or equipment damage caused by water accumulation is avoided; the fan 15 is electrically connected with an automatic frequency converter 151, and the automatic frequency converter 151 is used for controlling the electronic equipment of the motor rotating speed and the torque.

[0039] The above only describes the preferred embodiments of the present application and is not used to limit the present application; for the person skilled in the art, the present application can have various changes and variations; any modification, equivalent replacement, improvement and the like within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A cleanroom air conditioning secondary return air energy-saving system, characterized in that, include: An air handling unit (10) includes a first filter (11), a second filter (12), a first cooler (13), a second cooler (14), a fan (15), a heater (16), a humidifier (17), and a third filter (18) arranged in sequence. The air handling unit (10) is used to process mixed air. A fresh air section (20) is provided at the front end of the air handling unit (10), the fresh air section (20) being used to provide fresh outdoor air; A return air section (30) is provided above the air handling unit (10). The return air section (30) includes an exhaust duct (31) and a first return air passage (32) and a second return air passage (33) connected to the exhaust duct (31). The first return air passage (32) and the second return air passage (33) are connected to the air handling unit (10). The first return air passage (32) is located between the first filter (11) and the second filter (12). The second return air passage (33) is located between the first cooler (13) and the second cooler (14). The first return air passage (32) and the second return air passage (33) are used to provide indoor return air. An air supply section (40) is located at the rear end of the air handling unit (10) and is used to deliver the treated mixed air into the room.

2. The cleanroom air conditioning secondary return air energy-saving system according to claim 1, characterized in that, During the first return air, the ratio of the return air volume of the return air section (30) to the supply air volume of the supply air section (40) is D1 = 30-40%, and during the second return air, the ratio of the return air volume of the return air section (30) to the supply air volume of the supply air section (40) is D2 = 60-70%.

3. The cleanroom air conditioning secondary return air energy-saving system according to claim 2, characterized in that, The ratio of return air volume between the first return air duct (32) and the exhaust duct (31) is D3 = 10-15%.

4. The clean air conditioning secondary return air energy-saving system according to claim 1, characterized in that, The first cooler (13) is connected to a plurality of first temperature sensors (131), the second cooler (14) is connected to a plurality of second temperature sensors (141), and the heater (16) is provided with a third temperature sensor (161).

5. A cleanroom air conditioning secondary return air energy-saving system according to claim 1, characterized in that, A condensate drain pipe (132) is connected below the first cooler (13) and the second cooler (14), and the condensate drain pipe (132) is connected to a floor drain.

6. The cleanroom air conditioning secondary return air energy-saving system according to claim 1, characterized in that, A steam condensate collection pipe (162) is connected below the heater (16) and humidifier (17), and a steam trap (163) is installed on the steam condensate collection pipe (162).

7. A cleanroom air conditioning secondary return air energy-saving system according to claim 1, characterized in that, The fan (15) is electrically connected to the automatic frequency converter (151).

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