CN210373958U - Secondary air return system with energy-saving effect - Google Patents
Secondary air return system with energy-saving effect Download PDFInfo
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- CN210373958U CN210373958U CN201920803786.9U CN201920803786U CN210373958U CN 210373958 U CN210373958 U CN 210373958U CN 201920803786 U CN201920803786 U CN 201920803786U CN 210373958 U CN210373958 U CN 210373958U
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Abstract
The utility model provides a secondary return air system with energy-conserving effect, the return air of drawing forth from the air conditioner room, partly get into the fan after through a return air duct and new trend are mixed, and another part gets into the fan through the secondary return air duct, and the return air that the fan sent out mixes the back with the return air that the fan sent out, enters into the air conditioner region. The front air inlet of the fan is provided with a primary filter. The secondary return air of the utility model is provided with the air feeder independently, so that the air quantity passing through the air handling unit is reduced, and the energy consumption, the unit cost and the size of the fan of the air handling unit are effectively reduced; the two air blowers have different total pressures, but the air volume is the total air volume; the return air and the fresh air are mixed for cooling and dehumidifying, a single air feeder with large full pressure and small air volume is used for feeding air, the other part of the return air is a single air feeder with small air pressure, and the full pressure of the part of the air feeder is small, so that the energy is saved.
Description
Technical Field
The utility model belongs to the technical field of air conditioning, concretely relates to air return system of full air handling unit.
Background
The air conditioning summer air treatment is usually a common surface cooler, the cold water temperature is 7/12 ℃, the air temperature is reduced by the surface cooler, the humidity is reduced, the air temperature is reduced by 8-15 ℃, the relative humidity of the outlet air is 90-95%, and the requirement of air supply of the upper part of a common comfortable air conditioner can be met.
The temperature difference from the head to the feet of a working area in an air supply mode of a floor and a seat is not more than 3 ℃, the air supply temperature of an air supply outlet of the floor is preferably 17-18 ℃, the air supply temperature of the air supply outlet under the seat is about 19 ℃, dehumidification cannot be achieved by reducing the amount of cold source water or improving the temperature of the cold source, part of return air which is not cooled and dehumidified is required to be adopted to be mixed with surface air coolers to treat and supply air, and the air is suitable for floor air supply and seat air supply and is called a secondary return air supply system.
In the existing secondary air return system, one part of return air is mixed with fresh air to be subjected to cooling and dehumidifying treatment, and then the mixture is mixed with the other part of return air and sent into an air conditioning area by a blower. The air feeder has large air quantity, high pressure head and high energy consumption, secondary return air needs to be provided with an air valve for adjusting the air quantity, and the air valve consumes part of the energy consumption of the fan.
SUMMERY OF THE UTILITY MODEL
The utility model provides a secondary return air system with energy-conserving function to solve the problem that prior art exists.
The utility model adopts the following technical scheme:
a secondary return air system with energy-saving function is characterized in that return air led out from an air-conditioning room is partially mixed with fresh air through a primary return air pipe and then enters a fan, the other part of the return air enters the fan through a secondary return air pipe, and the return air sent out by the fan is mixed with the return air sent out by the fan and then enters an air-conditioning area.
And a primary filter is arranged at the front air inlet of the fan.
The primary air return pipe and the fresh air sequentially pass through the primary air return mixing section, the primary filter, the intermediate filter and the surface cooling/heating coil section to enter the fan.
The full pressure of the fan is greater than that of the fan.
The fan is a variable frequency speed regulation fan.
The utility model has the advantages that:
(1) the secondary return air is independently provided with the air feeder, so that the air quantity passing through the air handling unit is reduced, and the energy consumption, the unit manufacturing cost and the size of a fan of the air handling unit are effectively reduced;
(2) the two air blowers have different total pressures, but the air volume is the total air volume; the return air and the fresh air are mixed for cooling and dehumidifying, a single air feeder with large full pressure and small air volume is used for feeding air, the other part of the return air is a single air feeder with small air pressure, and the full pressure of the part of the air feeder is small, so that the energy is saved.
Drawings
Fig. 1 is a flowchart illustrating an operation of a conventional secondary air return system.
Fig. 2 is a flow chart of the secondary air return system of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The utility model provides a secondary return air system with energy-conserving effect, this secondary return air adopt two fans, and the total pressure of two fans is different, but the air supply volume is total amount of wind, can reduce energy consumption, unit cost and the whole size of air treatment unit fan.
As shown in fig. 2, the utility model discloses in, the return air of drawing forth from the air-conditioned room is divided into two parts, and one of them part is through a return air pipe, mixes this part return air and new trend, sends into fan I6, and during another part return air enters into fan II 7 through the secondary return air pipe, after the mixed wind that return air through fan 7 and fan I6 sent out mixes, sends into the air conditioning region and carries out the air supply, for example enter into floor lower part or seat lower part and carry out floor air supply or seat air supply.
Fan II 7 can set up in the box, and the box is connected with secondary return air pipeline, and the box is inside to be set up to carry out filterable primary filter 21 to the return air that gets into the box, sends into fan II 7 through primary filter 21 return air, and then sends into the air conditioning region with the return air that satisfies the air requirement.
And the same box that can set up in primary return air pipe rear portion, this box has air intake and air outlet, air intake department sets up primary return air mixing section 1, a return air for mix the new trend and the primary return air that gets into this section through primary return air pipe, the box at primary return air mixing section 1 rear portion is inside to set gradually primary filter 21, medium efficiency filter 3, table cold/heating coil section 5, fan I6, the wind of fan I6 passes through in the air outlet enters into the tuber pipe of front end, send into the air conditioning region with the secondary mixture that fan II 7 sent into.
Of course, above-mentioned each section, if once return air mix section 1, primary filter 21, well effect filter 3, the cold dish of table/heating coil section of pipe 5, fan I6 also can set up alone, through the pipe connection each other, also can realize the utility model discloses an effect.
The surface cooling/heating coil section 5 represents a surface cooling coil section or a heating coil section, and different pipe sections can work according to different requirements.
The utility model discloses a two fans, fan I6's total pressure is greater than fan II 7's total pressure. The total pressure is different, but the air quantity is the total air quantity; mixing part of return air with fresh air, and performing cooling and dehumidifying treatment, wherein a blower I6 with small air volume and large full pressure is arranged independently; the other part of return air is independently provided with a blower II 7 with smaller air pressure, and the two blowers supply air and mix to form supply air with smaller temperature difference and lower relative humidity, thereby meeting the supply requirements of large supply air quantity and small supply temperature difference, such as floor supply, seat supply, and the like. Compared with the traditional secondary air return system, the air quantity of the blower of the unit is reduced, and the energy consumption is reduced.
The secondary return air is independently provided with the air feeder II 7, so that the air quantity passing through the air handling unit is reduced, and the energy consumption, the unit manufacturing cost and the size of a fan of the air handling unit are effectively reduced. And the single secondary return air blower has low total pressure, the energy consumption is far lower than that of an air handling unit, and the energy-saving effect can be achieved.
The blower II 7 with independent secondary return air adopts variable frequency speed regulation to regulate the air quantity, and the secondary return air quantity is convenient to regulate and energy-saving.
The utility model discloses in, if secondary return air calculates according to 50%, wind pressure 400Pa, the wind resistance such as surface cooler is according to 300Pa, and forced draught blower wind pressure 700Pa meter, the fractional energy saving (700 + 400)/700 + 50% = 21.43%. If the secondary return air is calculated according to 50% and the wind pressure of 400Pa, the wind resistance of a surface air cooler and the like is calculated according to 300Pa, and the wind pressure of a blower is calculated according to 700Pa, the energy saving rate (700-400)/700 x 50% = 21.43%.
While the preferred embodiments of the present invention have been described, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the general inventive concept, and it is intended to cover all such changes and modifications as fall within the true spirit and scope of the invention.
Claims (5)
1. The utility model provides a secondary return air system with energy-conserving effect which characterized in that: and one part of return air led out from the air-conditioning room enters the fan I (6) after being mixed with fresh air through the primary return air pipe, the other part of return air enters the fan II (7) through the secondary return air pipe, and the return air sent out by the fan II (7) is mixed with the return air sent out by the fan I (6) and then enters the air-conditioning area.
2. A secondary air return system with energy saving function as claimed in claim 1, wherein: and a primary filter (22) is arranged at the front air inlet of the fan II (7).
3. A secondary air return system with energy saving function as claimed in claim 1, wherein: the primary air return pipe and the fresh air sequentially pass through the primary air return mixing section (1), the primary filter (21), the intermediate filter (3) and the surface cooling/heating coil section (5) and enter the fan I (6).
4. A secondary air return system with energy saving function as claimed in claim 1, wherein: and the total pressure of the fan I (6) is greater than that of the fan II (7).
5. A secondary air return system with energy saving function as claimed in claim 1, wherein: and the fan II (7) is a variable-frequency speed-regulating fan.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920803786.9U CN210373958U (en) | 2019-05-30 | 2019-05-30 | Secondary air return system with energy-saving effect |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920803786.9U CN210373958U (en) | 2019-05-30 | 2019-05-30 | Secondary air return system with energy-saving effect |
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| CN210373958U true CN210373958U (en) | 2020-04-21 |
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| CN201920803786.9U Active CN210373958U (en) | 2019-05-30 | 2019-05-30 | Secondary air return system with energy-saving effect |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110094825A (en) * | 2019-05-30 | 2019-08-06 | 河南省建筑设计研究院有限公司 | A kind of secondary return air system with energy-conserving action |
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2019
- 2019-05-30 CN CN201920803786.9U patent/CN210373958U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110094825A (en) * | 2019-05-30 | 2019-08-06 | 河南省建筑设计研究院有限公司 | A kind of secondary return air system with energy-conserving action |
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