CN2421593Y

CN2421593Y - Vacuum heat-insulation direct heat absorption type solar cooling pipe

Info

Publication number: CN2421593Y
Application number: CN 00216930
Authority: CN
Inventors: 刘震炎; 卢允庄
Original assignee: Shanghai Jiaotong University
Current assignee: Shanghai Jiaotong University
Priority date: 2000-03-21
Filing date: 2000-03-21
Publication date: 2001-02-28
Anticipated expiration: 2010-03-21

Abstract

The utility model relates to a vacuum heat-insulation direct heat absorption type solar cooling pipe. An S-shaped spiral coil pipe is arranged in a condenser, and a double-layer structure is formed outside an adsorbent bed. A double-layer coaxial high boron silicon glass pipe is used, and a vacuum heat-insulation interlayer is arranged between an outer pipe and an inner pipe. The inner part of the adsorbent bed is filled with a cylindrical adsorbent block of which the outer surface has a high absorption rate to solar radiation, the cylindrical adsorbent block is provided with pore canals, and a central pore canal is a steam passage. The utility model eliminates the contact resistance in the heat-insulation process of the adsorbent bed, reduces the radiation loss in the heating process of the adsorbent bed, and realizes the real absorption and conversion of solar energy. The utility model has the advantages of simple structure, good sealing property, convenient processing and assembly, and easy industrial production.

Description

The cold pipe of direct endothermic solar of vacuum heat-insulation

The utility model relates to a kind of solar cold pipe, relates in particular to a kind of cold pipe of direct endothermic solar of vacuum heat-insulation, belongs to the new energy use technology field.

Solid adsorption refrigeration utilizes absorption and the desorption realization kind of refrigeration cycle of solid absorbent to cold-producing medium, advantages such as the solid adsorption refrigeration system by Driven by Solar Energy is simple in structure because of it, movement-less part, environmentally safe have good development prospect in solar energy ice making and field of air conditioning.Traditional adsorbed solar refrigeration system needs to accept solar energy by solar thermal collector, transfers energy to adsorbent bed again, and the thermal contact resistance between heat collector and the adsorbent bed is very unfavorable to conducting heat.In addition, adopt low vapor partial pressure liquid such as water or methyl alcohol to require the higher vacuum of energy long term maintenance as the adsorbed solar refrigeration system of cold-producing medium.There is a kind of adsorbent bed can directly absorb the solar refrigeration system of the glass cooling pipe type of solar energy in recent years, avoided the vacuum leak of system simultaneously.But still fail to solve well the insulation problem of adsorbent bed, resolution temperature is low and efficient is not high.

The purpose of this utility model is to provide the cold pipe of high-efficiency solar absorption type of a kind of environmentally safe, movement-less part, the adsorbent bed of this cold pipe can directly absorb solar energy and insulation effectively, every cold pipe has a refrigeration unit of one's own, and is simple in structure, good airproof performance.

For realizing such purpose, the solar cold pipe of the utility model design is made up of adsorbent bed, condenser and evaporimeter three parts, the axis of adsorbent bed and condenser can have an angle, the outside of adsorbent bed is a double-layer coaxial high-boron-silicon glass pipe, two interlayers are the vacuum heat-insulation interlayer, in condenser, arrange snakelike spiral coil, cold-producing medium is housed in the evaporimeter.The inner filling of adsorbent bed outer surface has the cylindrical adsorbent piece in the road with holes of higher absorption rate to solar radiation.

Operation principle of the present utility model is: daytime, adsorbent bed directly absorbed solar energy and the temperature rising, refrigerant vapour is come out by desorption from adsorbent bed, system's internal pressure rises, when system pressure reached the saturation pressure corresponding with condensation temperature, refrigerant vapour was condensed into liquid and is stored in the evaporimeter at the spiral coil outer surface of condenser.This heating desorption process proceeded to 3: 30 afternoon from 7: 30 morning.At dusk, the adsorbent bed temperature begins to reduce, and adsorbs the cold-producing medium in the evaporimeter gradually, owing to the evaporation of cold-producing medium produces refrigeration.

The utility model has solved effective absorption and the storage of adsorbent bed to solar energy, the solar cold pipe that provides in summer when fine the heat-collecting temperature of adsorbent bed can reach more than 90 ℃, the gross energy conversion efficiency ratio of incident solar energy (cold of generation with) is about 0.13.The utility model effectively utilizes clean solar, and process of refrigerastion is pollution-free fully, and is simple in structure, and the operation operation is convenient, is expected to producing good economic and social benefit aspect energy savings, the protection environment.

Below by embodiment and accompanying drawing the technical solution of the utility model is further described.

Fig. 1 is a structural representation of the present utility model.

Among the figure, solar cold pipe is made of adsorbent bed 1, condenser 2 and evaporimeter 3 three parts, and this two-part axis of adsorbent bed and condenser can have an angle α, 60 °≤α≤180 °, in condenser, arrange snakelike spiral coil 4, cold-producing medium 5 is housed in the evaporimeter.

Fig. 2 is an adsorbent bed A-A cross-sectional view among Fig. 1.

Among the figure as seen, the adsorbent bed outside is a double-decker, adopt double-layer coaxial high-boron-silicon glass pipe, be vacuum heat-insulation interlayer 7 between outer tube 6 and the interior pipe 8, filling outer surface in the inside of adsorbent bed has the cylinder bodily form adsorbent piece 9 in the road of being made by adsorbent powder or particle with holes of higher absorption rate to solar radiation, the adsorbent piece can be made by the active carbon that solar radiation is had the higher absorption rate, also can be coated with at the adsorbent piece outer surface of other kind solar radiation is had the coating of higher absorption rate, the central duct of compound adsorbent piece is a steam channel 10.

In an embodiment of the present utility model, disposed external surface scribbles the compound adsorbent piece based on zeolite molecular sieve of activated carbon coating in the cold pipe adsorbent bed, and cold-producing medium is a water.The length of adsorbent bed, condenser and evaporimeter is respectively 1000mm, 100mm and 200mm, the axis angle of adsorbent bed and condenser is 180 °, the cold can body is glass tube, and the inner and outer pipe caliber of double-layer glass tube is respectively 47mm, 57mm, and the vacuum in the insulating sandwich is 5 * 10 ^-3Pa.Make application test with this cold pipe, cold pipe tilts to place, and its axis becomes 30 ° of angles with horizontal plane.Adsorbent bed is assigned to from the morning 7: 30 and is received solar radiation 3: 30 afternoon, and the period average intensity of sunshine is 650W/m ², average ambient temperature is 31 ℃.The average heat-collecting temperature of adsorbent bed is 90 ℃, and cold-producing medium average evaporating temperature at night is 10 ℃, adds the free convection output of the steam heat of condensation of thermal desorption circulation by the water in the spiral coil, and the refrigerating capacity of a cold pipe is about 140kJ, and the gross energy conversion efficiency is 13%.

Claims

1, a kind of cold pipe of direct endothermic solar of vacuum heat-insulation, constitute by adsorbent bed 1, condenser 2 and evaporimeter 3 three parts, it is characterized in that in condenser, arranging snakelike spiral coil 4, cold-producing medium 5 is housed in the evaporimeter, the adsorbent bed outside is a double-decker, adopt double-layer coaxial high-boron-silicon glass pipe, be vacuum heat-insulation interlayer 7 between outer tube 6 and the interior pipe 8, adsorbent bed inside is filled with outer surface has the road with holes of higher absorption rate to solar radiation cylinder bodily form adsorbent piece 9, and its central duct is a steam channel 10.