CN107906724B

CN107906724B - Enhanced heat exchange type radiation convection cold and heat exchanger

Info

Publication number: CN107906724B
Application number: CN201711316741.0A
Authority: CN
Inventors: 舒海文; 姜珊; 张宏亮; 端木琳
Original assignee: Dalian University of Technology
Current assignee: Dalian University of Technology
Priority date: 2017-12-12
Filing date: 2017-12-12
Publication date: 2020-04-28
Anticipated expiration: 2037-12-12
Also published as: CN107906724A

Abstract

The invention discloses an enhanced heat exchange type radiation convection cold and heat exchanger, and belongs to the field of tail end devices of heating, ventilating and air conditioning systems. The air conditioner comprises an upper collecting pipe, a lower collecting pipe, a heat exchange pipe, a water condensation tank, a small fan, a vertical air pipe with a side air supply opening, a flexible connection, a welding steel plate of the fan, a welding steel plate of the vertical air supply pipe and a fan inlet steel wire mesh. The invention realizes the obvious enhancement of the heating capacity of the device in winter and the cooling capacity of the device in summer by increasing the disturbance of the air flow outside the heat exchange calandria. This end device can realize under the cold and hot load condition in different rooms, changes air-out speed through adjusting the fan gear, and then adjusts this end device heat transfer volume size, reaches the purpose of control room temperature. The fan gear is divided into three gears, namely high, middle and low; the condensed water tank at the lower part of the device collects the condensed water on the surface of the equipment during cooling and bears the indoor wet load. The invention has flexible installation and use, lower noise and energy consumption during working and can better meet the requirement of thermal comfort of human bodies.

Description

Enhanced heat exchange type radiation convection cold and heat exchanger

Technical Field

The invention belongs to the technical field of design of a heating ventilation and air conditioning system tail end device, and particularly relates to a technology for enhancing the heat exchange effect of the heating ventilation tail end device.

Background

The development of economy makes people put higher requirements on indoor air environment of long-term life and work, and buildings in most areas such as the north of yellow river in China have heating requirements in winter and air-conditioning cooling requirements in summer. The final equipment of the cooling and heating system is the final link of regulating the indoor temperature, and the main function of the cooling and heating system is to perform heat and humidity exchange with the indoor environment so as to maintain the indoor air environment within the comfortable range of human bodies. At present, in the field of domestic building heating air-conditioning terminal equipment, cold and heat can be supplied simultaneously, the types of terminal equipment capable of bearing moisture load while supplying cold are very few, most common terminal equipment is a fan-coil unit, but the fan-coil unit circularly heats or cools indoor air by means of forced convection formed by a small centrifugal fan or a cross-flow fan in the unit, and therefore airflow disturbance is large, blowing feeling is easy to generate, and noise and fan energy consumption are relatively large; another common cold and hot end is the end of a floor (or ceiling) radiant panel, and this radiant panel end can bear the indoor heat load and sensible heat load, but does not allow condensation on the surface when cooling, that is: and cannot bear the indoor moisture load.

In patent "wet radiation convection cold-heat exchanger" (ZL201410012986.4), a terminal device having both winter heating and summer cooling and a dehumidifying function is proposed, but since the convection heat exchange of the invention patent is performed by using natural convection between the outer surface of the cold-heat exchanger and the indoor air, the heat exchange coefficient is low, and thus the area of the terminal device required is often too large when the indoor load is large.

Disclosure of Invention

In order to solve the problems, the invention provides the air conditioner terminal equipment which can enhance the heat exchange effect and can supply heat in winter and cool in summer. The technical scheme adopted by the invention is as follows:

the utility model provides an enhancement heat transfer formula radiation convection cold and heat exchanger, includes upper portion collector, lower part collector, heat exchange tube, congeals its characterized in that of water tank: the heat exchanger also comprises a small fan, a vertical blast pipe with a side air inlet, a flexible connection, a welding steel plate of the fan, a welding steel plate of the vertical blast pipe and a steel wire mesh at the inlet of the fan; the small fan is welded on the upper collecting pipe through a welding steel plate of the fan to realize the fixation of the fan, the vertical air supply pipe is firmly welded with the heat exchange pipe or the lower collecting pipe through the welding steel plate of the vertical air supply pipe, and the vibration is prevented from occurring in the air supply process; the small fan is connected with the vertical air supply pipe through flexible connection, so as to reduce the vibration of the air pipe in the air supply process; a side air supply opening is formed in the side face of the vertical air supply pipe, is tightly attached to the outer side of the heat exchange pipe, and supplies air along the arrangement direction of the heat exchange pipe so as to increase airflow disturbance on the outer surface of the heat exchange calandria and further realize enhanced heat exchange; the outer surfaces of the upper header, the lower header and all the heat exchange tubes are coated with super hydrophobic coatings.

Furthermore, the small-sized fan is a small-sized pipeline fan and is divided into a high gear, a middle gear and a low gear, so that the air quantity and the heat exchange strength of the fan can be conveniently adjusted according to the actual indoor temperature condition; the maximum noise is less than 36dBA, the noise level in bedrooms and living rooms (halls) is regulated according to the requirement of indoor low noise: the equivalent continuous a sound level in daytime bedrooms, living rooms (halls) should not be greater than 45dB, and the equivalent continuous a sound level in nighttime bedrooms should not be greater than 37 dB.

Furthermore, the area of each side air supply opening is gradually reduced from top to bottom along the vertical air supply pipe, so that the same air speed of each side air supply opening is ensured, and uniform air supply is realized.

Furthermore, the side air inlet on the vertical air supply pipe is round or rectangular; when the air blowing device is rectangular, the air speed at the side air supply opening is controlled to be 0.8-4 m/s, so that the heat exchange enhancement effect is ensured, and the requirement of a human body on the blowing feeling is met.

Furthermore, the flexible connection adopts silica gel glass fiber with high temperature resistant flexible connection characteristics, the length is 150 mm-300 mm, the vibration isolation and displacement compensation effects are achieved, the connection position is tight, firm and reliable, and the expansion amount is reserved after the installation.

The invention has the advantages that while the same terminal equipment is adopted to realize heating in winter and cooling in summer, the refrigeration quantity and the heat exchange quantity of the terminal equipment are improved by enhancing the external disturbance of the heat exchange pipe by utilizing the essential difference between forced convection and natural convection, thereby greatly improving the heat exchange capacity of the equipment. According to outdoor weather conditions, indoor cold/heat load changes and requirements of users on indoor air environments, the users can adjust the gear of the fan automatically to realize different cooling and heating effects.

Drawings

Fig. 1 is an overall view of an enhanced heat exchange type radiant convection cold and heat exchanger.

Fig. 2 is a front view of an enhanced heat exchange, radiant convection cold and heat exchanger.

Fig. 3 is a top view of an enhanced heat exchange, radiant convection cold and heat exchanger.

Fig. 4 is a left side view of an enhanced heat exchange, radiant convection cold and heat exchanger.

In the figure: 1 an upper header; 2 a lower header; 3, exchanging heat pipes; 4 a small fan; 5, a vertical blast pipe; 6 side air supply port; 7, soft connection; 8 welding steel plates of the fan; 9 welding steel plates of the vertical blast pipe; 10 a condensate tank; 11 fan inlet wire mesh.

Detailed Description

The invention will be further described with reference to the accompanying drawings.

An enhanced heat exchange type radiation convection cold and heat exchanger mainly comprises an upper collecting pipe 1 of the radiation convection cold and heat exchanger, a lower collecting pipe 2 of the radiation convection cold and heat exchanger, a heat exchange pipe 3 of the radiation convection cold and heat exchanger, a small fan 4, a vertical air supply pipe 5 with a side air supply opening, a side air supply opening 6, a flexible connection 7 between the fan and a vertical air pipe, a welding steel plate 8 of the fan, a welding steel plate 9 of the vertical air supply pipe, a water condensation tank 10 and a fan inlet steel wire mesh 11. The outer surfaces of the upper header 1, the lower header 2 and all the radiant convection heat exchange tubes 3 are coated with super hydrophobic coatings. The vertical blast pipe 5 is provided with a rectangular or round side air inlet 6 which is tightly attached to the outer side of the heat exchange calandria for supplying air so as to increase the disturbance of air flow on the outer surface of the heat exchange calandria and further realize the enhanced heat exchange.

The small fan 4 is welded on the upper collecting pipe 1 of the radiation convection cold and heat exchanger to realize the fixation of the fan, and at least two parts of the vertical blast pipe 5 are firmly welded with the heat exchange pipe 3 or the lower collecting pipe 2 of the radiation convection cold and heat exchanger to prevent the vibration in the air supply process.

The small fan 4 and the vertical blast pipe 5 are connected by a flexible connection 7. The flexible connection 7 is made of silica gel glass fiber high-temperature-resistant flexible connection materials, the length is preferably 150-300 mm, vibration isolation and displacement compensation are achieved, the connection position is tight, firm and reliable, and a certain amount of expansion and contraction are reserved after installation is finished.

The selected small fan 4 is a small pipeline fan which is divided into three stages of high, middle and low, so that the air quantity and the heat exchange strength of the fan can be conveniently adjusted according to the actual indoor temperature condition; the maximum noise is less than 36dBA, and the requirement of indoor low noise is met.

The air is uniformly supplied to the exhaust pipe by controlling the size of the side air supply opening 6 on the vertical air supply pipe 5. In order to realize uniform air supply, the area of the side air supply opening 6 is gradually reduced from top to bottom.

When the side air inlet 6 opened on the vertical air supply pipe 5 is rectangular, the vertical height of the air inlet is not less than the horizontal width.

The air speed at the air supply outlet 6 on the upper side of the vertical air supply pipe 5 is generally controlled to be 0.8-4 m/s, so that the requirement of people 1 m away from the equipment on the blowing sense is met while the heat exchange strengthening effect is ensured.

In the cooling working condition in summer, when the temperature of the outer surface of the pipeline is lower than the dew point temperature of indoor air, condensed water flows into the condensed water tank 9 at the lower part and is finally discharged from the condensed water discharge pipe, and cooling under the wet working condition is realized.

When the cold and heat sources of the system in summer and winter adopt the same set of heat pump unit, the cold and heat supply end equipment in the room can adopt an enhanced heat exchange type radiation convection cold and heat exchanger. Under the condition, when cold supply is needed to the room, the refrigerant fluid carries cold energy prepared by the heat pump unit to flow into the lower header 2 firstly, then the refrigerant is gradually heated or cooled to the room in the process of flowing through the vertically arranged radiation convection heat exchange tubes 3 from bottom to top, the refrigerant fluid with high temperature and low density is collected to the upper header 1 and then flows back to the heat pump unit through the water return pipeline connected with the upper header, and the circulation is carried out so as to continuously provide the cold energy to the room. In order to improve the cooling capacity of the equipment, the small fan 4 can be opened, the air supply flows through the vertical air supply pipe 5 and is sent out from the side air supply opening 6 along the horizontal direction outside the radiation convection heat exchange calandria 3, so that the air flow disturbance on the outer surface of the heat exchange pipe 3 is increased, and the heat exchange effect is enhanced. When the heat exchanger is used for cooling a room, condensed water generated on the surface of the heat exchanger is collected by the water condensation tank 10 wrapped outside the lower header 2 and flows to the condensed water discharge pipe along the gradient of the bottom of the water condensation tank.

When heating is needed to heat a room, the heat medium fluid flows in from the upper header 1 and flows out from the lower header 2, which is the opposite of the cold supply situation, and the switching of the flow direction can be completed by switching the valve at the heat pump unit side.

The gear of the small fan can be adjusted at the end of a user. In the cooling season, when the indoor cooling load is changed from high to low, the gear of the small fan can be correspondingly adjusted from highest to lowest until being turned off. Similarly, during the heating season, when the outdoor air temperature changes from low to high (i.e., the indoor heat load changes from high to low), the gear of the small fan can be adjusted from highest to lowest accordingly until turned off. This matches the cooling/heating capacity of the device to the changes in the indoor cooling/heating load, thereby ensuring that the room temperature is maintained within the human comfort range.

Claims

1. The utility model provides an enhancement heat transfer formula radiation convection cold and heat exchanger, includes upper portion collector (1), lower part collector (2), heat exchange tube (3), condensate tank (10) its characterized in that: the heat exchanger also comprises a small fan (4), a vertical air supply pipe (5) with a side air supply opening (6), a flexible connection (7), a welding steel plate (8) of the fan, a welding steel plate (9) of the vertical air supply pipe and a fan inlet steel wire mesh (11); the small fan (4) is welded on the upper header (1) through a welding steel plate (8) of the fan to realize the fixation of the fan, and the vertical blast pipe (5) is firmly welded with the heat exchange pipe (3) or the lower header (2) through a welding steel plate (9) of the vertical blast pipe; the small fan is connected with the vertical blast pipe through a flexible connection (7); a side air supply opening (6) is formed in the side surface of the vertical air supply pipe (5), is tightly attached to the outer side of the heat exchange pipe and supplies air along the arrangement direction of the heat exchange pipe; the outer surfaces of the upper collecting pipe (1), the lower collecting pipe (2) and all the heat exchange pipes (3) are coated with super hydrophobic coatings;

the small fan (4) is a small pipeline fan and is divided into a high gear, a middle gear and a low gear; the maximum noise is less than 36 dBA;

the area of each side air supply opening (6) is gradually reduced from top to bottom along the vertical air supply pipe, so that the same air speed of each side air supply opening is ensured, and uniform air supply is realized.

2. An enhanced heat exchange type radiant convection cold and heat exchanger as claimed in claim 1, wherein the side air supply opening (6) of the vertical air supply duct (5) is circular or rectangular; when the side air supply opening is rectangular, the vertical height of the side air supply opening (6) is not less than the horizontal width.

3. An enhanced heat exchange type radiant convection cold and heat exchanger as claimed in claim 1 or 2, wherein the wind speed at the side air supply port (6) is controlled to be 0.8-4 m/s.

4. An enhanced heat exchange type radiant convection cold and heat exchanger as claimed in claim 1 or 2, characterized in that said flexible connection (7) is made of silica gel glass fiber with high temperature resistant flexible connection characteristics, the length is 150 mm-300 mm, the connection is tight, firm and reliable, and the expansion amount is left after installation.

5. An enhanced heat exchange type radiant convection cold and heat exchanger as claimed in claim 3, characterized in that said flexible connection (7) is made of silica gel glass fiber with high temperature resistant flexible connection characteristics, the length is 150 mm-300 mm, the connection is tight, firm and reliable, and the expansion and contraction amount is left after installation.