CN201740442U

CN201740442U - Efficient evaporative heat exchanger heat exchange coil

Info

Publication number: CN201740442U
Application number: CN201020223403XU
Authority: CN
Inventors: 徐雄冠; 姜文俊; 邓凯翔; 周兴东; 江磊
Original assignee: Bac Dalian Co ltd
Current assignee: Bac Dalian Co ltd
Priority date: 2010-06-11
Filing date: 2010-06-11
Publication date: 2011-02-09
Anticipated expiration: 2020-06-11

Abstract

The utility model belongs to the field of evaporative heat exchange equipment. The heat exchange coil of the high-efficiency evaporative heat exchanger adopts multiple tube passes, the number of tube passes is 2 to 12, and each tube pass adopts 2 to 8 circuits. The coil bundle of some or all tube passes is installed with enhanced heat transfer components. In the coil assembly of the utility model, according to the characteristics of the cooling or condensing working medium and the tube resistance requirements, the coil is partially or completely internally finned, and the fins are processed separately by a special mold, and the structure and shape of the fins are adjustable; the fins are directly inserted into the installation method, which is convenient and flexible, and the processing cost is low; the support provided by the core tube can fully ensure the contact area between the fin and the outer tube, and minimize the contact thermal resistance of the inner fin. The coil assembly using the inner fin type enhanced heat transfer component has a large heat exchange capacity per unit volume and high heat exchange efficiency, so the overall size of the heat exchanger is smaller, saving the space occupied by the equipment.

Description

High-efficiency evaporation type heat exchanger heat exchange coil

Technical field

The utility model belongs to vaporation-type heat-exchange apparatus field, particularly its heat-exchange method, and the utility model also relates to its heat exchange coil assembly in addition.

Background technology

Evaporating heat exchanger comprises evaporative condenser and vaporation-type fluid cooler, as Fig. 1, Fig. 2 and shown in Figure 3, be the heat transmission equipment that traditional water-cooled heat transmission equipment and circulating water cooling tower are combined,, realize the heat exchanging process of the inside and outside working medium of pipe by in heat exchange coil surface spraying low-temperature circulating water, and by the cold dry air of forced convertion, shower water is partly evaporated, keep low circulating water temperature, finally take away hot fluid institute liberated heat in the pipe.Since little, the energy efficient of its water consumption, facility compact, easy for installation, safeguard advantages such as simple, obtained using widely.Especially to the industrial refrigeration system, with respect to the conventional tube shell heat exchanger, the condensation temperature of evaporative condenser is more near environment wet-bulb temperature, system condensing pressure is lower, the energy consumption of save compressed function consumption and recirculated water, and additional connecting line is few, and plant maintenance is convenient, stable, with the obvious advantage, can substitute the conventional tube shell tube condenser fully.But be subjected to effects limit such as processing conditions, the still light pipe form that the present heat exchange coil of using mainly adopts, for the hot working fluid under a lot of situations in the practical application is to be in superheat state, the overheated gas working medium that enters condenser coil at first needs to be cooled to saturated vapor temperature, can realize condensation then, emit latent heat and finish enthalpy reduction process; In addition, a lot of Mixed Gas Condensation technologies are arranged, because the gas cooled heat transfer coefficient is lower, must consume coil area greatly and satisfy the cooling procedure of gas working medium, cause the coil pipe volume bigger, be installed in the evaporating heat exchanger casing and take, cause the transportation of equipment, the cost of installing and take aspects such as operational system space to increase a lot than large space.Existing evaporating heat exchanger, especially at the lower characteristics of gas working medium convection transfer rate in the pipe, use to such an extent that reasonable mode is to install one group of external finned tube additional at the exhaust outlet place at present, utilize the air of discharging to flow pre-cold gaseous superheat refrigeration working medium, its advantage is that extra energy consumption increase is less, but complete machine height and manufacturing cost obviously raise.

Summary of the invention

The purpose of this utility model is to overcome above-mentioned not enough problem, and a kind of high-efficiency evaporation type heat exchanger heat exchange coil is provided, and is simple in structure, reduce the coil pipe consumption, make product structure compacter, it is littler to take up room, transportation of reduction equipment and installation volume, augmentation of heat transfer improves heat transfer efficiency.

The technical scheme that the utility model is adopted for achieving the above object is: high-efficiency evaporation type heat exchanger heat exchange coil, coil pipe adopts the multitube journey, number of tube passes is 2～12, and every tube side adopts 2～8 loops, in the coil pipe tube bank of part tube side or whole tube sides the augmentation of heat transfer parts is installed.

Described augmentation of heat transfer parts adopt inner fin.

Closed at both ends supporting-core pipe is installed in the described coil pipe body, between coil pipe body and the supporting-core pipe inner fin is installed, the wing ratio is 3～12; Core pipe caliber Φ 4～8mm.

Described coil pipe body can adopt carbon steel or stainless steel body, and inner fin adopts the thin plate stainless steel, is rolled into zigzag or corrugated fin through mould.

Described heat exchange coil assembly is dividing plate, pipe, tube bank collector, import and the discharge connection of being arranged by snakelike tube bank, tube bank, and other support members are formed.

Intensified heat transfer method of the present utility model is the heat exchange characteristics according to evaporating heat exchanger, the heat exchange efficiency of managing outer shower water evaporation process is managed the cooling heat transferring process height of interior gas working medium relatively, convection transfer rate is less in the pipe, it is the control resistance of whole heat transfer process, adopt the heat convection area of gas working medium in the inner fin method extension tube, improve the heat exchange efficiency of gas working medium in pipe, change the phenomenon that resistance is not complementary in the heat transfer process between the inside and outside solution-air medium of pipe, increase heat convection area in the pipe, the Convective Heat Transfer of gaseous working medium in the enhanced tube makes the inside and outside heat transfer coefficient balance of pipe.

According to the characteristic and the pipe resistance requirement of cooling or condensation working medium, coil pipe is carried out part or all of interior wing processing in the utility model coil pack, fin is processed separately by special mould, and the structure and the shape of fin are adjustable; Fin adopts direct-insert mounting means, and is convenient, flexible, and processing cost is low; Supporting role by the core pipe provides can fully guarantee the contact area between fin and outer tube, has reduced the thermal contact resistance of inner fin to greatest extent.Adopt the coil pack of inner fin formula augmentation of heat transfer parts, unit volume heat exchange amount is big, the heat exchange efficiency height, so the machine shape size of heat exchanger is littler, has saved taking up room of equipment.

Adopt the evaporating heat exchanger of the utility model coil pack, can regulate water spray and air mass flow according to the characteristic of cooling or condensation working medium, coil arrangement does not have influence to the evaporating heat exchanger pattern.To the cooling procedure of gaseous working medium, can regulate parameters such as tube bank external diameter, inner fin structure and wingization compare and satisfy flow velocity and pressure drop requirement.

Description of drawings

Fig. 1 is overall tubular type evaporating heat exchanger;

Fig. 2 goes up filler pattern evaporating heat exchanger under the coil pipe;

Fig. 3 is the evaporating heat exchanger of the outer finned coil of band precooling;

Fig. 4 is the heat exchange coil component drawings of common evaporating heat exchanger;

Fig. 5 is the coil pipe cross-sectional view that the present invention is equipped with the augmentation of heat transfer parts.

The specific embodiment

Below in conjunction with accompanying drawing the utility model content is further described.

Embodiment 1: the refrigeration system that adopts ammonia refrigeration working medium, 35.7 ℃ of condensation temperatures, 40 ℃ of the degrees of superheat of the ammonia steam at compressor outlet place, evaporative condenser adopts Fig. 2 structure, form of bio-carrier under the last coil pipe, heat exchange coil assembly are by coil pipe tube bank 1, restrain dividing plate 2, pipe 3, tube bank collector 4, the import 5 of arranging and export 6 and take over, and other support members are formed, amount to 10 tube sides, coil pipe outer surface heat exchange area 250m ², the convection heat transfer' heat-transfer by convection thermal resistance ratio in the superheat section pipe accounts for 75%.

The high-efficiency evaporation type heat exchanger heat exchange coil of augmentation of heat transfer parts is installed in employing additional in the coil pipe tube bank of part tube side (to coil pipe porch the 1st, 2 tube sides), as Fig. 4, shown in Figure 5, coil pipe body 7 is carbon steel pipes of physical dimension Φ 26.7 * 1.5 (mm), stainless steel core pipe 8 is installed in the body, the physical dimension of core pipe is Φ 7 * 1 (mm), between body and the core pipe inner fin 9 is installed, the wing ratio is 6.5, inner fin adopts corrugated stainless steel fin, and parameters such as other structures and water pump blower fan dispose with reference to conventional products.

Through test, adopt this kind intensified heat transfer method, the coil pipe heat exchange efficiency can improve 4%～6%.Under the same row heat, it is about 5% that coil area and width can reduce, and the complete machine width can reduce by 3%～4%, and product processing, cost of transportation and installing space are also corresponding to be reduced.

Embodiment 2: the refrigeration system that adopts freon (R22a) refrigeration working medium, the compressor outlet place steam degree of superheat is 30 ℃, 40 ℃ of condensation temperatures, evaporative condenser adopts Fig. 2 structure, form of bio-carrier under the last coil pipe, heat exchange coil assembly are by coil pipe tube bank 1, restrain dividing plate 2, pipe 3, tube bank collector 4, the import 5 of arranging and export 6 and take over, and other support members are formed, amount to 10 tube sides, coil pipe outer surface heat exchange area 250m ², the convection heat transfer' heat-transfer by convection thermal resistance ratio in the superheat section pipe accounts for 70%.

The high-efficiency evaporation type heat exchanger heat exchange coil of augmentation of heat transfer parts is installed in employing additional in the coil pipe tube bank 1 of part tube side (to coil pipe porch the 1st, 2 tube sides), as Fig. 4, shown in Figure 5, coil pipe body 7 is carbon steel pipes of physical dimension Φ 26.7 * 1.5 (mm), stainless steel core pipe 8 is installed in the body, the physical dimension of core pipe is Φ 6 * 1 (mm), between body and the core pipe inner fin 9 is installed, the wing ratio is 4.5, inner fin adopts zigzag stainless steel fin, fin contacts with outer tube wall, be connected parameter constants such as other structures and water pump blower fan with the swelling of core pipe.

Through test, adopt this kind intensified heat transfer method, the coil pipe heat exchange efficiency can improve 3%～5%.Under the same row heat, it is about 4% that coil area and width can reduce, and the complete machine width can reduce by 3%～4%, and product processing, cost of transportation and installing space are also corresponding to be reduced.

Embodiment 3: the compressor outlet aerial cooler, adopt Fig. 1 to manage vaporation-type heat of cooling device totally, the heat exchange coil assembly is by coil pipe tube bank 1, restrains dividing plate 2, pipe 3, tube bank collector 4, the import 5 of arranging and export 6 and take over, and reaches other support members and forms, and coil arrangement is 2 tube side U-shaped structures.

The high-efficiency evaporation type heat exchanger heat exchange coil of augmentation of heat transfer parts is installed in employing additional in the coil pipe tube bank 1 of whole tube sides, as Fig. 4, shown in Figure 5, coil pipe body 7 is stainless steel tubes of physical dimension Φ 32 * 1.5 (mm), stainless steel core pipe 8 is installed in the body, the physical dimension of core pipe is Φ 8 * 1 (mm), between body and the core pipe inner fin 9 is installed, the wing ratio is 7, and parameters such as other structures and water pump blower fan dispose with reference to conventional products.

Through test, adopt this kind intensified heat transfer method, heat transfer coefficient 200W/m in the coil pipe ²℃, total heat exchange efficiency can improve 60%～70%.Under the same row heat, comprehensively manage the internal resistance situation, it is about 30% that coil area and width can reduce, and the complete machine width can reduce by 20%, and product processing, cost of transportation and installing space are also corresponding to be reduced.

Claims

1. High-efficiency evaporative heat exchanger heat exchange coil, the coil adopts multiple tube passes, the number of tube passes is 2 to 12, and each tube pass uses 2 to 8 loops, and its characteristics are: partial or all tube passes Enhanced heat transfer components are installed in the tube bundle.

2. The heat exchange coil of a high-efficiency evaporative heat exchanger according to claim 1, characterized in that: inner fins are used to enhance heat transfer.

3. The high-efficiency evaporative heat exchanger heat exchange coil according to claim 1 or 2, characterized in that: a supporting core tube is installed in the coil tube body, and an inner fin is installed between the coil tube body and the supporting core tube The finning ratio is 3-12; the diameter of the core tube is Φ4-8mm.

4. The high-efficiency evaporative heat exchanger heat exchange coil according to claim 2, characterized in that: the coil body can be made of carbon steel or stainless steel, and the inner fins can be made of thin plate stainless steel, which is rolled by a mold Serrated or corrugated fins.

5. The high-efficiency evaporative heat exchanger heat exchange coil according to claim 1 or 2, characterized in that: the heat exchange coil assembly is composed of coil tube bundles, partitions arranged by tube bundles, spacers, and tube bundle headers , inlet and outlet connectors, and supports.