CN116658975A - Heat supply air conditioner end device with replacement ventilation effect - Google Patents

Abstract

The application discloses a heat supply air conditioner tail end device with a replacement ventilation effect, which comprises a water system and a wind system; relates to the technical field of tail ends of heating ventilation air conditioning systems; the water system comprises an upper horizontal water main pipe, an upper horizontal backwater main pipe and a lower horizontal water collecting and distributing pipe which are positioned below the wind system, and a plurality of vertical heat exchange pipes are arranged between the upper horizontal water main pipe and the lower horizontal water collecting and distributing pipe and between the upper horizontal backwater main pipe and the lower horizontal water collecting and distributing pipe; the air system comprises a horizontal air supply pipe and a small-sized pipeline direct-current fan capable of realizing gear shifting and speed regulation, the small-sized pipeline direct-current fan is connected with the end part of the horizontal air supply pipe, and lower air supply short pipes are uniformly distributed at the bottom of the horizontal air supply pipe. The application can realize the replacement ventilation effect in the personnel working area when the tail end of the heat supply air conditioner supplies cold, namely: and an indoor air environment with good thermal comfort and high air quality is created while the thermal layering phenomenon is formed.

Description

A heating and air conditioning terminal device with displacement ventilation effect

technical field

The invention relates to the technical field of heating, ventilating and air-conditioning system terminals, in particular to a heating and air-conditioning terminal device with a displacement ventilation effect.

Background technique

my country's building construction and operation account for 37% of the total energy consumption of the whole society, of which building operation accounts for 23%. From the perspective of carbon dioxide emissions, my country's building construction and operation-related carbon dioxide emissions account for about 42% of my country's total social carbon dioxide emissions, of which building operations account for 20%.

From September 2019, GB/T51350-2019 "Technical Standards for Nearly Zero-Energy Buildings" was officially implemented. This is my country's first leading national standard for building energy conservation. The development trend of near-zero energy buildings has also spawned a variety of high-efficiency and energy-saving air-conditioning systems, among which the air-conditioning terminal plays a vital role in indoor thermal comfort, indoor air quality and energy consumption of the air-conditioning system. At present, the common air-conditioning terminal equipment in my country's buildings that can realize both cooling and heating mainly includes fan coil units and radiant panels. The noise level of fan coil units is generally between 30dB-60dB, and the air outlet speed is between 2 and 4m/s. Most of them use the top delivery method, which is easy to produce a sense of blowing, and is not suitable for occasions that require high noise control; radiation The surface of the panel is not allowed to condense during cooling, which not only limits the cooling capacity of the radiant panel, but also cannot bear the humidity load of the indoor air conditioner. Displacement ventilation is a ventilation method that can create a good indoor air environment and has energy-saving potential. It has been widely used in Europe and the United States. Not widely used yet.

The patent number is ZL2014100129864, and the name is wet radiation convection cooling and heat exchanger. Aiming at the characteristics of low cooling/heating loads of nearly zero-energy buildings, a kind of cooling system that can satisfy both heating in winter and cooling in summer and has dehumidification during cooling is proposed. Functional terminal equipment, but since the heat exchange between the air-conditioning terminal equipment and the indoor environment is carried out through natural convection and radiation, the heat transfer coefficient is relatively low when the heat exchange temperature difference is not large, resulting in a large indoor load. , the area of the terminal equipment is also larger.

Contents of the invention

The purpose of the present invention is to provide an air-conditioning terminal device that can enhance heat exchange effect and has both winter heating, summer cooling and dehumidification functions, and also has displacement ventilation effect, which can create a high-quality indoor air environment.

In order to achieve the above purpose, the technical solution of this application is: a heating and air conditioning terminal device with a displacement ventilation effect, including a water system and a wind system;

The water system includes an upper horizontal main water supply pipe, an upper horizontal return water main pipe, and a lower horizontal sub-collection pipe located below the wind system. Multiple vertical heat exchange tubes are arranged between the water tubes;

The wind system includes a horizontal air supply pipe and a small ducted DC fan that can realize variable gear speed regulation. The small ducted DC fan is connected to the end of the horizontal air supply pipe, and the bottom of the horizontal air supply pipe is evenly distributed with downflow air short tube.

Further, the relationship between the wind speed v (m/s) at the air outlet of the lower air supply short pipe and the height H (m) of the vertical heat exchange tube is: H<v<H+2 (v and H only represents the value of speed and height), and the wind speed v is in the range of 1-4m/s.

Further, an automatic exhaust valve a is provided at the highest end of the upper horizontal water supply main pipe, and an automatic exhaust valve b is provided at the highest end of the upper horizontal return water main pipe.

Further, a flexible connection is used between the horizontal air supply pipe and the small ducted DC fan, the connection material is canvas or silicone glass fiber with high temperature resistance, and the length of the flexible connection is 20mm-50mm, which plays the role of vibration isolation and displacement compensation Function, its joints are tight, firm and reliable, and there is some expansion and contraction after installation.

Further, the materials of the upper horizontal water supply main pipe, the upper horizontal return water main pipe and the lower horizontal sub-collection pipe can be metal materials such as stainless steel, copper or aluminum alloy that are not easy to corrode and have good pressure bearing performance, or can be metal materials that meet the requirements of anti-corrosion and Plastic pipes meeting pressure requirements.

Furthermore, the material of the vertical heat exchange tube is a metal or plastic material with strong thermal conductivity, good pressure bearing performance and not easy to corrode. super-hydrophobic coating.

Further, there is a condensate tank at 5-10cm below the lower horizontal water-collecting pipe, and the material of the condensate tank is polyvinyl chloride PVC and polypropylene PP with a thickness of 2-6mm, which have high strength, high hardness, impact resistance and anti-corrosion performance. Good plastic pipes; spray or attach an insulation layer with a thermal conductivity of not less than 0.15 (m ² ·K/W) on the outside of the condensate tank.

Furthermore, multiple vertical heat exchange tubes are fixed by upper horizontal sheet metal, lower horizontal sheet metal, left vertical sheet metal and right vertical sheet metal; each vertical heat exchange tube is provided with longitudinal Rectangular micro-ribs play the role of condensate water diversion. Preferably, the sheet metal material is a metal with high strength and corrosion resistance.

As a further step, the diameter of the horizontal air supply pipe is gradually reduced to ensure that the air supply speed of each air supply port is the same to achieve uniform air supply; the end with a large diameter is fixed on the left vertical On the straight sheet metal, the end with a small diameter is fixed on the right vertical sheet metal through angle steel to ensure the horizontal state of the horizontal main air duct.

As a further step, the cross-section of the air outlet of the short down air supply pipe is circular or rectangular, and each air outlet has the same size and corresponds to the vertical heat exchange tubes one by one.

Due to the adoption of the above technical scheme, the present invention can achieve the following technical effects: the heating and air-conditioning terminal with displacement ventilation effect can be independently applied to various comfortable air-conditioning buildings, especially suitable for ultra-low or near-zero energy consumption buildings, low temperature The low-velocity air is sent into the lower part of the room, which has the effect of displacement ventilation in the personnel working area, forming thermal stratification and creating an indoor air environment with good thermal comfort and high air quality.

Description of drawings

Fig. 1 is an axonometric view of an air conditioner terminal device with displacement ventilation effect;

Fig. 2 is a front view of an air conditioner terminal device with displacement ventilation effect;

Fig. 3 is a top view of an air conditioner terminal device with displacement ventilation effect;

Fig. 4 is a right view of the air conditioner terminal device with displacement ventilation effect;

Fig. 5 is a cloud map of indoor air velocity;

Figure 6 is a cloud map of indoor temperature distribution.

Description of serial numbers in the figure: 1. Upper horizontal water supply main pipe; 2. Upper horizontal return water main pipe; 3. Upper horizontal sheet metal; 4. Right vertical sheet metal; 5. Vertical heat exchange tube; 6. Lower horizontal sheet metal Gold; 7. Small ducted DC fan; 8. Soft joint; 9. Fixed frame; 10. Condensation water tank; 11. Lower horizontal water collection pipe; 12. Horizontal air supply pipe; 13. Vertical sheet metal on the left side; 14. Automatic Exhaust valve a; 15. Automatic exhaust valve b.

Detailed ways

In order to enable those skilled in the art to better understand the solution of the application, the technical solution in the embodiment of the application will be clearly and completely described below in conjunction with the drawings in the embodiment of the application. Obviously, the described embodiment is only It is a part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

Example 1

As shown in Figures 1-4, this embodiment provides a heating and air-conditioning terminal device with a displacement ventilation effect, including: a water system, a wind system and auxiliary components;

The water system includes an upper horizontal main water supply pipe 1, an upper horizontal water return main pipe 2, a lower horizontal sub-collection pipe 11, and a plurality of vertical heat exchange pipes 5 connecting the upper horizontal water supply and return main pipes and the lower horizontal sub-collection pipe. An automatic exhaust valve a14 is provided at the highest end of the upper horizontal water supply main pipe, an automatic exhaust valve b15 is provided at the highest end of the upper horizontal return water main pipe, and a condensation water tank 10 is provided under the lower horizontal water distribution pipe.

The wind system includes a small ducted DC fan 7 capable of variable gear speed regulation, a horizontal air supply pipe 12 with a uniform downward air supply short pipe, and a soft joint 8 connecting the DC fan and the horizontal air supply pipe.

The auxiliary parts include the fixing frame and angle steel for fixing the horizontal air supply pipe, the wire mesh of the fan inlet, the upper horizontal sheet metal, the lower horizontal sheet metal, the left vertical sheet metal and the right vertical sheet metal for fixing multiple vertical heat exchange tubes. Straight sheet metal.

Preferably, the distance between two adjacent vertical heat exchange tube walls is 8-12mm; the tube diameter is 18-22mm.

Preferably, the air outlets of the lower short air supply pipes are circular or rectangular, and the air outlets are all of the same size, and correspond to the arrangement and quantity of the vertical heat exchange tubes one by one. When the height of the vertical heat exchange tube is 2m, the wind speed at the air supply port is 2-4m/s; while ensuring the enhanced heat exchange effect, it meets the requirement of displacement ventilation effect.

The surface of the vertical heat exchange tube is covered with a super-hydrophobic coating that can change the condensation form of condensed water into bead-like condensation to enhance the heat exchange effect of the outer surface of the tube. The outer surface of the vertical heat exchange tube is provided with longitudinal rectangular micro-ribs, which play the role of diverting condensed water.

The small duct DC fan is welded to the left vertical sheet metal to fix the fan. At least two horizontal air supply pipes are firmly welded to the upper horizontal supply and return water main pipes to prevent vibration during the air supply process.

The small ducted fan 7 can realize variable gear speed regulation, which is convenient to adjust the fan air volume according to the indoor cooling/heating load to adjust the heat exchange intensity; the maximum fan noise is less than 36dBA, which meets the national standard for noise levels in bedrooms and living rooms (halls). Regulations: The equivalent continuous A sound level in the bedroom and living room (hall) during the day should not be greater than 45dB, and the equivalent continuous A sound level in the bedroom at night should not be greater than 37dB.

The cold/heat medium in the vertical heat exchange tube is water, ethylene glycol aqueous solution and other liquids with large specific heat capacity, freezing point not higher than 5°C, non-corrosive to metal and non-toxic to human body.

The working method of the above heating air conditioner terminal device is: the cold/heat medium processed by the cold and heat source system passes through the upper horizontal water supply main pipe, flows through half the number of vertical heat exchange pipes from top to bottom, and then passes through the lower horizontal water distribution pipe, Flowing through the remaining half of the vertical heat exchange tubes from bottom to top, the cold/heat medium fluid is collected into the upper horizontal return water main pipe, and then flows back to the cold and heat source system through the return water pipe connected to the upper horizontal return water main pipe, so cycle, during which the heat exchange tubes continuously supply cooling/heating to the room. In order to improve the cooling capacity of the equipment, a small ducted DC fan can be turned on. The inlet of the fan sucks in the indoor air, and the outlet of the fan is connected to the horizontal air supply pipe. The diameter of the horizontal air supply pipe gradually decreases with the direction of the airflow to ensure The speed is the same to achieve uniform air supply. The air supply flows through the lower air supply short pipe and is evenly sent from the air supply outlet. It is blown from top to bottom along the vertical heat exchange tube. The air flow is cooled during this process, and when the cold air settles to the ground position Spread along the ground, as shown in Figure 5; at the same time, a thermal stratification phenomenon is formed in the room, as shown in Figure 6; the downward air supply increases the airflow disturbance on the outer surface of the heat exchange tube, which plays a role in strengthening heat transfer. At the same time, It achieves an effect similar to displacement ventilation in the room. Figure 5-6 shows the numerical simulation results under the condition of supply and return water temperature of 12/15°C and air supply speed of 2.5m/s. At this time, the cooling capacity reaches 458.6W, which is higher than that without additional turbulence. About 40%. The indoor temperature is kept between 23°C and 26°C, and there is only a small range of large temperature gradients near the surface of the device. The lowest temperature at the ankle is higher than 21°C, and the vertical temperature difference is less than 3°C. ～1.8m and 1.8～2.6m are divided into the temperature rise of the ground surface, the temperature rise of the work area, and the temperature rise of the upper part of the room. The temperature gradient is the smallest within the height range of the work area. The wind speed in the working area is controlled within 0.3m/s, and the wind speed in most areas can be controlled within 0.1m/s. The wind speed field is evenly distributed, and only a local large velocity gradient appears on the surface of the device. Due to the settlement and diffusion of cold air, the ground surface The nearby wind speed is slightly higher than other indoor areas. When the air-conditioning terminal device with displacement ventilation effect is cooling, the condensed water generated on its surface flows into the condensed water tank at the lower part. The air supply speed of the small fan can be adjusted at the end of the user. In the cooling season, when the indoor cooling load changes from high to low, the gear of the fan can be adjusted from the highest to the lowest within the allowable range to increase the cooling capacity. It matches the change of indoor cooling load, so as to ensure that the room temperature is maintained within the comfortable range of the human body.

If outdoor fresh air is introduced, the terminal device can form the same effect as traditional displacement ventilation; if no fresh air is introduced, the terminal device proposed in this application can still achieve other effects of displacement ventilation except that it cannot improve the freshness of the air in the work area. Such as the formation of thermal stratification of indoor air, creating a high thermal comfort indoor environment in the work area, so it is called "air-conditioning terminal device with displacement ventilation effect".

The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still apply to the foregoing embodiments Modifications are made to the recorded technical solutions, or equivalent replacements are made to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims (10)

1. The heat supply air conditioner end device with the replacement ventilation effect is characterized by comprising a water system and a wind system;

the water system comprises an upper horizontal water main pipe, an upper horizontal backwater main pipe and a lower horizontal water collecting and distributing pipe which are positioned below the wind system, and a plurality of vertical heat exchange pipes are arranged between the upper horizontal water main pipe and the lower horizontal water collecting and distributing pipe and between the upper horizontal backwater main pipe and the lower horizontal water collecting and distributing pipe;

the air system comprises a horizontal air supply pipe and a small-sized pipeline direct-current fan capable of realizing gear shifting and speed regulation, the small-sized pipeline direct-current fan is connected with the end part of the horizontal air supply pipe, and lower air supply short pipes are uniformly distributed at the bottom of the horizontal air supply pipe.

2. The heat supply air conditioner end device with the replacement ventilation effect according to claim 1, wherein the relation between the wind speed v (m/s) at the wind inlet of the lower wind supply short pipe and the height H (m) of the vertical heat exchange pipe in terms of numerical values is: h < v < H+2, and the wind speed v is in the range of 1-4 m/s.

3. A heating air conditioner end device with a replacement ventilation effect according to claim 1, wherein an automatic exhaust valve a is arranged at the highest position of the end part of the upper horizontal water main pipe, and an automatic exhaust valve b is arranged at the highest position of the end part of the upper horizontal water return main pipe.

4. The heat supply air conditioner tail end device with the replacement ventilation effect according to claim 1, wherein the horizontal air supply pipe and the small-sized pipeline direct current fan are in soft connection, the connecting material is canvas or silica gel glass fiber with high temperature resistance, and the soft connection length is 20-50 mm.

5. A heating and air conditioning terminal device with a replacement ventilation effect according to claim 1, wherein the upper horizontal water mains, the upper horizontal return water mains and the lower horizontal water collecting mains are made of metal or plastic pipes.

6. A heating and air conditioning end unit with displacement ventilation according to claim 1, wherein the vertical heat exchange tubes are made of metal or plastic and the surfaces of the vertical heat exchange tubes are coated with an ultraphobic coating.

7. The heat supply air conditioner tail end device with the replacement ventilation effect according to claim 1, wherein a condensate tank is arranged at a position 5-10 cm below the lower horizontal collecting water pipe, and the condensate tank is a plastic pipe with the thickness of 2-6 mm; the outside of the water condensation tank is sprayed or attached with a heat conduction resistance of not less than 0.15m ² K/W insulation.

8. The heat supply air conditioner end device with the replacement ventilation effect according to claim 1, wherein the plurality of vertical heat exchange tubes are fixed by an upper horizontal sheet metal, a lower horizontal sheet metal, a left vertical sheet metal and a right vertical sheet metal; the outer surface of each vertical heat exchange tube is provided with a longitudinal rectangular micro rib, which plays a role in guiding the condensed water.

9. A heating air conditioner end device with a replacement ventilation effect according to claim 1, wherein the pipe diameter of the horizontal blast pipe is gradually reduced; the end with large pipe diameter is fixed on the left vertical metal plate through a fixing frame, and the end with small pipe diameter is fixed on the right vertical metal plate through angle steel.

10. The heat supply air conditioner end device with the replacement ventilation effect according to claim 1, wherein the section of the air supply opening of the lower air supply short pipe is round or rectangular, and each air supply opening has the same size and corresponds to the vertical heat exchange pipe one by one.