CN107202451A - A kind of residents multipotency source absorption type capillary network refrigeration system - Google Patents

Abstract

The invention discloses a kind of residents multipotency source absorption type capillary network refrigeration system, including residents solar thermal collection system, low-grade combustible gas burner, absorption type refrigerating unit, underground heat source heat exchanger, capillary network system.Described residents solar thermal collection system includes trough type solar heat-collector and first circulation pump；Described low-grade combustible gas burner includes air accumulator, gradual combustor；Described absorption type refrigerating unit includes generator, oil-ammoniacal liquor heat exchanger, absorber, condenser, evaporator；Described capillary network system includes capillary water knockout drum, capillary network water collector, ammonia-water- to-water heat exchanger, second circulation pump.The present invention improves the thermal efficiency of system by designing high-performance heat exchanger, and provides the user comfortable, healthy solutions for refrigeration using a variety of clean energy resourcies.

Description

A Household Multi-Energy Absorption Capillary Network Refrigeration System

technical field

The invention relates to a refrigeration system, in particular to a multi-energy absorption capillary network refrigeration system.

Background technique

With the rapid development of our national economy, the shortage of energy and resources and environmental pollution have become very serious problems. As a big energy consumer in China, energy issues have always been valued by the state, and building energy consumption accounts for 40% to 50% of the total energy consumption, especially for HVAC, accounting for more than half, which is the main body of building energy consumption. Active development and utilization of low-grade energy is conducive to alleviating environmental pressure.

In my country's remote power-deficient areas, people cannot use conventional electric refrigeration systems. However, in these areas, there may be relatively abundant energy sources such as solar energy, geothermal energy, and low-grade combustible gas. Refrigeration systems based on multi-energy sources can not only improve the quality of life of local farmers, but also do not increase traditional energy consumption, and are also conducive to environmental protection. , will undoubtedly have very broad prospects.

At the same time, the capillary network radiative refrigeration system proposed by German scientists based on the principle of bionics uses water as the refrigerant carrier to transfer heat through uniform and tight capillary network radiation. Cooling requires a supply water temperature of 12-18°C. However, traditional refrigeration and air conditioners often use convection cooling, which consumes a lot of power, and the cooling effect is not ideal. Moreover, people are prone to various diseases when using air conditioners for a long time. The energy cost of capillary radiation refrigeration system for cooling is much lower than that of traditional refrigeration . In addition, the capillary radiant refrigeration system also has the characteristics of high comfort, convenient installation, space saving, long service life, clean and environmental protection.

Through retrieval, Chinese patent (CN101793444A) discloses a kind of solar energy and biomass energy combined absorption refrigeration device, and it comprises solar collector and absorption refrigerator, the heater inlet of solar collector outlet water and absorption refrigerator The water is connected, the water outlet of the heater is connected with the liquid storage tank, the water inlet of the solar collector is connected with the liquid storage tank through a circulating pump and a one-way valve, and the solar heat collector; it also includes a biomass stove, and its water outlet is connected with the heater The water inlet is connected to each other, and the water inlet is connected to the liquid storage tank through a circulating water pump and a one-way valve, and the water inlet is also connected to the water outlet of the solar heat collector. This patent combines solar energy with biomass energy, which can realize continuous cooling while saving energy, but the current effective utilization rate of solar energy is very low, and when the sun is not sufficient, only biomass energy can be used to provide energy for the entire system , which will lead to biomass energy occupying the vast majority of the energy supply of the entire system, and the energy saving effect is not obvious; in addition, the patent does not clearly propose the design of the heat exchangers of each connecting part, which may lead to low heat exchange efficiency.

Chinese patent (CN201569099U) discloses a novel ground source heat pump capillary roof air conditioning system, which includes a ground source heat pump system and a capillary roof air conditioning system; the ground source heat pump system includes an outdoor pipe network system, a heat pump working fluid circulation system and an indoor air conditioning pipe network System; capillary tube roof air conditioning system includes heat exchanger, distribution station with circulation pump, temperature control and adjustment system, capillary tube network and supporting dehumidification system. This patent only considers the use of geothermal source heat pumps to provide energy for the capillary network radiation refrigeration system, and the energy source is too single, which may cause discontinuous refrigeration process and insufficient cooling capacity.

Contents of the invention

In order to overcome the deficiencies of the prior art, the present invention provides an absorption capillary network radiation refrigeration system based on solar energy, geothermal energy, and low-grade combustible gas energy, using three complementary energy sources: geothermal energy, solar energy, and low-grade combustible gas The chemical energy is used as the energy supply of the refrigeration system, the ammonia-water solution is used as the circulating working medium of the absorption refrigeration device, and the capillary network is used as the terminal refrigeration system, thus providing low-carbon, environmentally friendly, healthy and comfortable refrigeration for users in power-deficient areas plan.

The technical solution adopted by the present invention to solve the problems of the prior art is:

A household multi-energy absorption capillary network refrigeration system includes a household solar heat collection system, a low-grade combustible gas combustion device, an absorption refrigeration device, a geothermal source heat exchanger, and a capillary network system. The solar heat collection system is connected to the absorption refrigeration device; the low-grade combustible gas combustion device is located below the absorption refrigeration device; the capillary network system is connected to the absorption refrigeration device through an ammonia-water heat exchanger; the geothermal source heat exchanger is connected to the capillary tube The network system is connected to form a closed circulation waterway. The household solar heat collection system includes a trough solar heat collector and a first circulating pump; the low-grade combustible gas combustion device includes a gas storage tank and a staged burner; the absorption refrigeration device includes a generator device, oil-ammonia water heat exchanger, condenser, throttle valve, evaporator, absorber; the capillary network system includes capillary water separator, capillary network, capillary network water collector, ammonia-water heat exchanger, The second circulation pump; the outlet of the trough solar collector is connected to the inlet of the first circulation pump, the outlet of the first circulation pump is connected to the inlet of the oil-ammonia water heat exchanger; the low-grade combustible gas is connected to the gas storage tank, and the gas storage tank is exported It is connected to the staged burner; the oil-ammonia water heat exchanger is ringed at the lower part of the generator, the upper outlet of the generator is connected to the inlet of the condenser, the outlet of the condenser is connected to the inlet of the evaporator through a throttle valve, and the outlet of the evaporator is connected to the absorber The inlet of the absorber is connected, the outlet of the absorber is connected with the inlet of the generator; the second circulating pump, ammonia-water heat exchanger, capillary water separator, capillary network, capillary water collector, and geothermal source heat exchanger are connected in sequence, and the geothermal source heat exchange The other side of the device is connected with the other side of the second circulating pump to form a circulating water circuit.

The oil-ammonia water heat exchanger is ring-sleeved on the generator, the generator is a vertical circular tube, and a semicircular diversion baffle is arranged inside the oil-ammonia water heat exchanger, and the surface of the generator is evenly welded with certain The thickness of the rectangular fins, the rectangular fins are inclined upward and the angle α with the vertical direction is 40-50 degrees, and the length L of the fins is 1/6-1/4 of the diameter D of the generator.

The staged burner includes a primary burner and a secondary burner, the primary burner includes a gas pipe and a nozzle, and is located below the bottom edge of the oil-ammonia water heat exchanger, and the secondary burner includes a gas pipe and a nozzle , located below the center of the bottom of the generator, and the two-stage burners are respectively equipped with independent gas control valves.

The geothermal source heat exchanger is a metal circular tube with a conical helical structure, its helix angle β is 10-14 degrees, and the geothermal source heat exchanger is buried shallowly below the ground surface from top to bottom, and its entrance is in the ground. 1.8-2.2 meters below the surface, and its outlet is 2.8-3.2 meters below the ground surface.

The trough solar heat collector in the household solar heat collection system is provided with an arc-shaped shading plate, the radius R of the arc-shaped shading plate is 1.5 to 2.0 times the radius r of the high-temperature heat collecting tube, and the shading plate The outer surface is coated with silicone high temperature resistant paint.

The beneficial effect of the present invention is that the present invention improves the heat exchange efficiency of the oil-ammonia water heat exchanger by arranging semicircular deflectors and rectangular fins. The arranged staged burners can improve the utilization rate of solar energy. The ground source heat exchanger with the conical spiral structure can improve the heat exchange efficiency between the soil and the working medium in the metal circular tube. The setting of the circular shading plate is beneficial to adjust the oil temperature of the household solar heat collection system, thereby adjusting the temperature of the working medium in the capillary network. The invention adopts solar energy, geothermal energy, and low-grade combustible gas energy combined with absorption refrigeration, which overcomes many disadvantages of low solar energy utilization rate, insufficient sunlight, and discontinuous refrigeration process caused by a single energy source, and insufficient cooling capacity. question. In addition, the present invention designs the heat exchanger structure according to the characteristics of the system, improves the refrigeration efficiency of the system, and provides guarantee for the continuous and high-efficiency refrigeration of the system.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the sectional view of oil-ammonia water heat exchanger;

Figure 3 is a partial enlarged schematic view of Figure 2;

Fig. 4 is A-A direction view among Fig. 2;

Fig. 5 is the structural representation of geothermal source heat exchanger;

Fig. 6 is a partially enlarged schematic diagram of Fig. 5;

Fig. 7 is the structural representation of trough type solar heat collector;

Figure 8 is a structural schematic diagram of a staged burner

detailed description

The present invention will be further described in detail below in conjunction with the accompanying drawings and through specific embodiments. The following embodiments are only descriptive, not restrictive, and cannot limit the protection scope of the present invention.

The household multi-energy absorption capillary network refrigeration system includes a household solar heat collection system 17, a low-grade combustible gas combustion device 20, an absorption refrigeration device 18, a geothermal source heat exchanger 12, and a capillary network system 19. It is characterized in that: the household solar heat collection system 17 includes a trough solar heat collector 1 and a first circulation pump 2; the low-grade combustible gas combustion device 20 includes a gas storage tank 16 and a staged burner 15 The absorption refrigeration unit 18 includes a generator 4, an oil-ammonia water heat exchanger 3, a condenser 5, a throttle valve 6, an evaporator 7, and an absorber 14; the capillary network system 19 includes a capillary water separator Device 9, capillary network 10, capillary network water collector 11, second circulation pump 13, ammonia-water heat exchanger 8; trough solar heat collector 1 outlet is connected with the first circulation pump 2 inlet, the first circulation pump 2 The outlet is connected to the inlet of the oil-ammonia water heat exchanger 3; the low-grade combustible gas is connected to the gas storage tank 16, and the outlet of the gas storage tank 16 is connected to the staged burner 15; , the upper outlet of the generator 4 is connected to the inlet of the condenser 5, the outlet of the condenser 5 is connected to the inlet of the evaporator 7 through the throttle valve 6, the outlet of the evaporator 7 is connected to the inlet of the absorber 14, and the outlet of the absorber 14 is connected to the generator 4 Inlet connections; the second circulating pump 13, ammonia-water heat exchanger 8, capillary water separator 9, capillary network 10, capillary water collector 11, and ground heat source heat exchanger 12 are connected in sequence, and the ground heat source heat exchanger 12 The other side is connected to the other side of the second circulating pump 13, thereby forming a circulating water channel.

The oil-ammonia water heat exchanger 3 is looped on the generator 4. The generator 4 is a vertical circular tube, and a semicircular guide baffle 21 is arranged inside the oil-ammonia water heat exchanger 3. The surface of the generator 4 is evenly welded. There are rectangular ribs 22 with a certain thickness, the rectangular ribs 22 are inclined upward and the angle α with the vertical direction is 40-50 degrees, and the length L of the ribs is 1/6-1/4 of the diameter D of the generator.

The staged burner 15 in the low-grade combustible gas combustion device 20 includes a primary burner 26 and a secondary burner 27. The primary burner 26 includes a gas pipe 28 and a nozzle 29, and is located near the bottom surface of the oil-ammonia water heat exchanger 3. Below the edge, the secondary burner 27 includes a gas pipe 30 and a nozzle 31, and is located below the center of the bottom of the generator 4. The primary and secondary burners are respectively provided with independent gas control valves 32 and 33.

The geothermal source heat exchanger 12 is a metal circular tube with a conical spiral structure, and its helix angle β is 10-14 degrees, and the geothermal source heat exchanger 12 is buried shallowly below the ground surface from top to bottom, and its entrance is on the ground surface 1.8-2.2 meters below, and its exit is 2.8-3.2 meters below the ground surface.

The trough solar heat collector 1 in the household solar heat collection system 17 is provided with an arc-shaped shading plate 23, and the radius R of the arc-shaped shading plate 23 is 1.5 to 2.0 times the radius r of the high-temperature heat collecting tube 24, The outer surface of the light-shielding plate 23 is coated with an organosilicon high-temperature-resistant coating 25 .

Working principle of the present invention:

When the sunlight is sufficient, the working medium oil in the trough solar collector rises to the working temperature of 320 degrees Celsius, and the household solar heat collection system starts to start, and the first circulation pump is the working medium oil of the household solar heat collection system To provide circulating power, the working medium oil heats the ammonia solution in the generator through the oil-ammonia water heat exchanger; when the temperature of the working medium oil is lower than 320 degrees Celsius, but still above 260 degrees Celsius, the household solar thermal collection system is still in the In the working state, the low-grade combustible gas combustion device starts to work at the same time, and the primary burner in the staged burner heats the oil-ammonia water heat exchanger by burning combustible gas, thereby heating the ammonia solution in the generator; when the temperature of the working medium oil is lower than At 260 degrees Celsius, only the low-grade combustible gas combustion device starts to work, and the secondary burner in the staged burner burns combustible gas to heat the generator, thereby heating the ammonia solution in the generator; in addition, when the sun is too strong, it can pass Adjust the arc-shaped shading plate to adjust the temperature of the working medium oil.

After the ammonia solution in the generator is heated, part of the ammonia gas is separated from the solution. Ammonia gas passes through the condenser and evaporates in the evaporator to absorb heat after the throttle valve. The water circulates through the whole capillary network system, and the second circulation pump delivers the water to the capillary water separator and the capillary network. When the water flows through the capillary network, it takes away the heat in the user's building. After absorbing the heat, the water is combined by the capillary water collector, and then passes through the geothermal source heat exchanger and the ammonia-water heat exchanger to exchange heat and cool down in order, thereby realizing circulating refrigeration for users.

Claims (5)

1. A household type multi-energy absorption type capillary network refrigeration system, comprising a household type solar heat collection system, a low-grade combustible gas combustion device, an absorption refrigeration device, a ground heat source heat exchanger, and a capillary network system, is characterized in that : The solar heat collection system is connected with the absorption refrigeration device; the low-grade combustible gas combustion device is located under the absorption refrigeration device; the capillary network system is connected with the absorption refrigeration device through an ammonia-water heat exchanger; the geothermal source heat exchanger is connected with the absorption refrigeration device The capillary network system is connected to form a closed circulation waterway. 2. A household type multi-energy absorption capillary network refrigeration system according to claim 1, wherein said absorption refrigeration device comprises a generator, an oil-ammonia water heat exchanger, a condenser, a throttling Valve, evaporator, absorber, the oil-ammonia water heat exchanger ring is set on the generator, the generator is a vertical circular tube, and a semicircular guide baffle is arranged inside the oil-ammonia water heat exchanger, The surface of the generator is evenly welded with rectangular fins, the rectangular fins are inclined upward and the angle α with the vertical direction is 40-50 degrees, and the length L of the fins is 1/6-1/4 of the diameter D of the generator. 3. A household type multi-energy absorption capillary network refrigeration system according to claim 1, wherein the low-grade combustible gas combustion device includes a gas storage tank and a staged burner, and the staged combustion The burner includes a primary burner and a secondary burner. The primary burner includes gas pipes and nozzles and is located below the bottom edge of the oil-ammonia water heat exchanger. The secondary burner includes gas pipes and nozzles and is located at the bottom of the generator. Below the center, the two-stage burners are respectively provided with independent gas control valves. 4. A household type multi-energy absorption capillary network refrigeration system according to claim 1, wherein the geothermal source heat exchanger is a metal circular tube with a cone-shaped helical structure, and its helix angle β is 10-14 degrees, and the geothermal source heat exchanger is buried shallowly below the ground surface from top to bottom, its inlet is 1.8-2.2 meters below the ground surface, and its outlet is 2.8-3.2 meters below the ground surface. 5. A kind of household type multi-energy absorption type capillary network refrigeration system according to claim 1, is characterized in that, described household type solar heat collection system comprises trough type solar heat collector and the first circulating pump; The trough-type solar heat collector is provided with an arc-shaped shading plate, the radius R of the arc-shaped shading plate is 1.5 to 2.0 times the radius r of the high-temperature heat collecting tube, and the outer surface of the shading plate is coated with organic silicon high-temperature-resistant paint .