CN101876496B - Double-evaporator direct-fired absorption refrigerating and heating unit - Google Patents
Double-evaporator direct-fired absorption refrigerating and heating unit Download PDFInfo
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- CN101876496B CN101876496B CN200910237140XA CN200910237140A CN101876496B CN 101876496 B CN101876496 B CN 101876496B CN 200910237140X A CN200910237140X A CN 200910237140XA CN 200910237140 A CN200910237140 A CN 200910237140A CN 101876496 B CN101876496 B CN 101876496B
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Abstract
A kind of double-evaporator direct-fired absorption refrigerating and heating unit, belongs to hvac equipment field. The present invention has been connected in parallel the heat supply branch with defrosting branch and air-cooled evaporator on the cooling supply branch road in common absorption-type cold-hot water dispenser group, the direct-fired absorption refrigerating and heating unit for forming double evaporators, is able to achieve three kinds of independent heat supply, independent cooling supply and simultaneous air-conditioning operational modes. In heat supply mode, using direct-fired absorption heat pump, take heat from outside air using air-cooled evaporator, produce the hot water of higher temperature, which than the supplying hot water mode in existing direct combustion type water chiller-heater unit have higher non-renewable energy utilization efficiency and
Efficiency; In cold and heat supply mode, heat supply is carried out by the condensation heat of recycling discharge in the cooling mode, the energy consumption of cooling tower is saved, substantially increases the synthesis cold and heat supply efficiency of equipment. In addition, the present apparatus, which also passes through bypass condenser branch, realizes effective defrosting outside air-cooled evaporator.
Description
Technical field
The invention belongs to the hvac equipment field, be particularly useful for preparing air-conditioning system hot water or cold water and domestic hot-water.
Background technology
Direct combustion type hot and cold water unit is the energy with combustion gas, fuel oil, and directly burning through it produces high-temperature flue gas as heating source, utilizes the principle of Absorption Cooling System and heat pump cycle, produces the hot water or cold water, supplies the refrigeration in summer, the usefulness of winter heating.Along with China's rapid development of economy; People ' s health consciousness and growth in the living standard; People are more and more to the demand of refrigeration cold water, health hot water and heating hot water, summer cooling, winter heating hot water and domestic hot-water consumption all constantly increase, certainly will cause its energy consumption also very big.Because the direct-fired absorption refrigerating and heating unit is power with heat energy, need not consume a large amount of electric energy, and can utilize waste gas, used heat etc., thereby be used widely.
Yet present common direct-fired hot and cold water unit is not high in the efficient of heat supply water, even also is lower than the employing boiler heat supplying.Be illustrated in figure 1 as common direct-fired hot and cold water unit, a leg bypass condenser, during its heat supply water; Open the heating valve on the bypass branch road; With high temperature refrigerant vapor condensation heat release on evaporator tube bank that generator comes out, hot water is heated intensification in the pipe, thereby produces the hot water supply user; During cooling water, close heating valve, open the cooling valve, the high temperature refrigerant vapor that generator comes out is after condenser condenses, and evaporation heat absorption on evaporator tube bank makes the cooling of pipe inner cold water, thereby produces the Cold water supply user.This device is that generator is used as boiler, even adopted flue gas heat-recovering device, its heating efficiency is also forever less than 100%
External environment is a huge energy treasure-house, if can promote its energy level through absorption heat pump and supply with user's use from extraneous heat-obtaining, has then improved the primary energy efficient of device.
According to above-mentioned thought, the present invention proposes a kind of double-evaporator direct-fired absorption refrigerating and heating unit.Cooling pattern of the present invention is identical with common direct combustion type absorption-type cold-hot water dispenser group; But in heat supply mode; The employing direct-fired generator drives; Utilize air-cooled evaporimeter heat-obtaining from external environment; Promote the grade of environmental air heat energy, thereby produce the hot water of higher temperature, this mode has higher primary energy utilization ratio and
efficient than the heat supply water mode in the existing common direct combustion type hot and cold water unit.
Summary of the invention
The present invention proposes a kind of double-evaporator direct-fired absorption refrigerating and heating machine set technology scheme, not only has the air conditioner cold water of producing function, also can be from outdoor air heat-obtaining, high efficiency is produced idle call hot water and domestic hot-water.
Technical scheme of the present invention is:
A kind of double-evaporator direct-fired absorption refrigerating and heating unit; Contain absorption-type cold-hot water dispenser group, cold water inlet, hot water outlet pipe, cooling water inlet pipe and cooling water outlet pipe; Said absorption-type cold-hot water dispenser group is made up of generator, condenser, throttling arrangement, first evaporimeter, absorber, solution heat exchanger, solution pump and the pressure-reducing valve that is arranged on the concentrated solution pipe, it is characterized in that: first valve of regulating the cryogen flow is set on the cooling branch road between the throttling arrangement and first evaporimeter; Between the cryogen side outlet of the inlet of first valve and first evaporimeter, second evaporimeter is set, said second evaporimeter is air-cooled evaporimeter, makes second evaporimeter parallelly connected with first evaporimeter; On the heat supply branch road between the throttling arrangement and second evaporimeter, second valve is set; Said hot and cold water unit also comprises a defrosting steam pipe that has the 3rd valve, and the inlet of defrosting steam pipe links to each other with the outlet of generator, and the outlet of defrosting steam pipe links to each other with the outlet of described second valve.
In described a kind of double-evaporator direct-fired absorption refrigerating and heating unit, said absorption-type cold-hot water dispenser group is single-effective absorption hot and cold water unit or double effect absorption hot and cold water unit; Said cryogen is water or ammonia or all kinds of refrigeration working medium; Said second evaporimeter can place in the unit, also can place outside the unit, forms split-type structural.
Adopt technique scheme to have following remarkable advantage:
1. can realize independent cooling, independent heat supply and three kinds of operational modes of simultaneous air-conditioning, satisfy the demand of user the hot water or cold water.2. utilize absorption heat pump heat-obtaining from outdoor air, produce more heat, the heating efficiency that makes primary energy is much larger than conventional direct combustion type hot and cold water unit.The heating efficiency of 3. conventional direct combustion type hot and cold water unit is almost irrelevant with the hot water temperature who is produced height; But after adopting the present technique scheme; Its efficiency of energy utilization increases with hot water temperature's reduction with
efficient; Therefore the quality that when sub-load, realizes water temperature is easily regulated, and improves the thermal efficiency simultaneously.4. the present technique scheme has solved the air cooling heat exchanger effective defrosting problem during heat supply in the winter time; During defrosting; Directly introduce the high temperature refrigerant vapor of generator in the air-cooled evaporimeter; Convert air-cooled evaporimeter into condenser, and need not heat-obtaining from user side hot water, can not cause using the hot water temperature of side to be fluctuated widely.
Description of drawings
Fig. 1 is the principle assumption diagram of existing conventional direct-fired absorption refrigerating and heating unit.
Fig. 2 is the principle assumption diagram of a kind of double-evaporator direct-fired absorption refrigerating and heating unit provided by the invention and the sketch map of simultaneous air-conditioning.
Sketch map when Fig. 3 is an a kind of double-evaporator direct-fired absorption refrigerating and heating unit cooling provided by the invention.
Sketch map when Fig. 4 is a kind of double-evaporator direct-fired absorption refrigerating and heating unit heat supply provided by the invention.
Need be when Fig. 5 is a kind of double-evaporator direct-fired absorption refrigerating and heating unit heat supply provided by the invention to the sketch map of air-cooled evaporimeter defrosting.
Wherein: the 1-generator; The 2-absorber; The 3-condenser; 4-first evaporimeter; 5-second evaporimeter; 6-absorption type heat pump assembly; The 7-solution heat exchanger; The 8-solution pump; The 9-pressure-reducing valve; The 10-throttling arrangement; 11-weak solution pipe; 12-concentrated solution pipe; The 13-first refrigerant vapor pipe; 14-cooling branch road; The 15-second refrigerant vapor pipe; 16-the 3rd valve; 17-defrosting steam pipe; The 18-fuel cavity; 19-second valve; 20-first valve; 21-heat supply branch road; 22-the 4th valve; The 23-cooling water pipe; 24-cold/hot water pipe.
The specific embodiment
Fig. 2 is the principle assumption diagram of a kind of double-evaporator direct-fired absorption refrigerating and heating unit provided by the invention.This device contains absorption-type cold-hot water dispenser group 6, cold water inlet, hot water outlet pipe, cooling water inlet pipe and cooling water outlet pipe; Said absorption-type cold-hot water dispenser group 6 is made up of generator 1, condenser 3, throttling arrangement 10, first evaporimeter 4, absorber 2, solution heat exchanger 7, solution pump 8 and the pressure-reducing valve 9 that is arranged on the concentrated solution pipe 12, and first valve 20 of regulating the cryogen flow is set on the cooling branch road 14 between the throttling arrangement 10 and first evaporimeter 4; Between the cryogen side outlet of the inlet of first valve 20 and first evaporimeter 4, second evaporimeter 5 is set, said second evaporimeter 5 is air-cooled evaporimeter, makes second evaporimeter 5 parallelly connected with first evaporimeter 4; On the heat supply branch road 21 between the throttling arrangement 10 and second evaporimeter 5, second valve 19 is set; Said hot and cold water unit 6 also comprises a defrosting steam pipe 17 that has the 3rd valve 16, and the inlet of defrosting steam pipe 17 links to each other with the outlet of generator 1, and the outlet of defrosting steam pipe 17 links to each other with the outlet of described second valve 19.
A kind of double-evaporator direct-fired absorption refrigerating and heating unit that the present invention proposes has independent cooling, independent heat supply and three kinds of operational modes of simultaneous air-conditioning; When independent heat supply and simultaneous air-conditioning pattern, behind air-cooled evaporimeter frosting, also need move the defrosting pattern.
Below in conjunction with accompanying drawing the present invention is further described.The dotted line place is current idle branch road among its figure.
One, cooling pattern
Sketch map when Fig. 3 is an a kind of double-evaporator direct-fired absorption refrigerating and heating unit cooling provided by the invention.
Complete opening first valve 20 is closed second valve 19 and the 3rd valve 16 fully, and the B mouth switches to user side.The solution of said generator 1 is heated; The cryogen evaporation is overflowed; Solution concentration reduces, and concentrated solution gets into absorber 2 again through after solution heat exchanger 7 and the pressure-reducing valve 9 cooling throttlings, absorbed refrigerant vapour from first evaporimeter 4 after; Solution concentration raises, and after solution heat exchanger 7 and concentrated solution heat exchange heat up, returns generator 1 by solution pump 8 again; The solution of said generator 1 is heated; The cryogen evaporation is overflowed; Through first refrigerant vapor pipe 13 to the condenser 3, condensed becomes cryogen liquid in the pipe in the device 3 that is condensed, and after the 10 step-down throttlings of the throttling arrangement on the cooling branch road 14, gets into first evaporimeter 4; And absorbed the heat of the cold-water return that the B mouth gets into, then the cold water temperature back that descends is supplied with the user and is used.The A mouth connects cooling tower and discharges condensation heat, also can connect other pipelines and reclaim condensation heat.
When novel direct-fired absorption-type cold-hot water dispenser group operates to the cooling pattern and the cooling condition basically identical of present hot and cold water unit.
Two, heat supply mode when defrosting (not)
Sketch map when Fig. 4 is a kind of double-evaporator direct-fired absorption refrigerating and heating unit heat supply provided by the invention.
Complete opening second valve 19 is closed first valve 20 fully, closes the 3rd valve 16, and the A mouth switches to user side.The solution of said generator 1 is heated; The cryogen evaporation is overflowed; Solution concentration reduces, and concentrated solution gets into absorber 2 again through after solution heat exchanger 7 and the pressure-reducing valve 9 cooling throttlings, absorbed refrigerant vapour from first evaporimeter 4 after; Solution concentration raises, and after solution heat exchanger 7 and concentrated solution heat exchange heat up, returns generator 1 by solution pump 8 again; The solution of said generator 1 is heated; The cryogen evaporation is overflowed; Be condensed into cryogen liquid through first refrigerant vapor pipe 13 to the condenser 3; After the 10 step-down throttlings of the throttling arrangement on the cooling branch road 14, get into second evaporimeter 5 and absorbed airborne heat and receive thermal evaporation, get into absorber 2 again by the solution absorption heat release; After the solution heat release and twice heating of condenser 3 heat releases of the backwater of user side in absorber 2, supply with the user and use.
Three, cooling, heat supply mode when defrosting (not)
Fig. 2 is the sketch map of a kind of double-evaporator direct-fired absorption refrigerating and heating unit simultaneous air-conditioning provided by the invention.
Part is opened second valve, 19, the first valves 20, closes the 3rd valve 16 fully, and the A mouth is received user's heat-obtaining end, and the B mouth is received the user and got cold junction.The solution of said generator 1 is heated; The cryogen evaporation is overflowed; Solution concentration reduces, and concentrated solution gets into absorber 2 again through after solution heat exchanger 7 and the pressure-reducing valve 9 cooling throttlings, absorbed refrigerant vapour from first evaporimeter 4 after; Solution concentration raises, and after solution heat exchanger 7 and concentrated solution heat exchange heat up, returns generator 1 by solution pump 8 again; The solution of said generator 1 is heated, and the cryogen evaporation is overflowed, and it is condensed into cryogen liquid through first refrigerant vapor pipe 13 to the condenser 3, after the 10 step-down throttlings of the throttling arrangement on the cooling branch road 14, becomes low pressure cryogen liquid:
1) a part of low pressure cryogen liquid gets into first evaporimeter 4, and has absorbed the heat of the cold-water return that the B mouth comes in, and then the cold water temperature back that descends is supplied with the user and got cold junction and use.The A mouth connects cooling tower and discharges condensation heat, also can connect other pipelines and reclaim condensation heat;
2) another part low pressure cryogen liquid is bypassed to heat supply branch road 21 to second evaporimeters 5, has absorbed airborne heat and has received thermal evaporation, gets into absorber 2 again by the solution absorption heat release; After the solution heat release and twice heating of condenser 3 heat releases of the backwater of user side in absorber 2, supply with user's heat-obtaining end and use.
So far, device has been realized the purpose of heating and cooling simultaneously, but simultaneously during heating and cooling, its effect is more inferior slightly than single cold or single heat.
Four, defrosting pattern
Because air-cooled evaporimeter is in the process that absorbs the outside air thermal source, when ambient temperature was too low, frosting caused heat transfer process normally to carry out outside easily, thereby influenced the heating effect of unit.
Need be when Fig. 5 is a kind of double-evaporator direct-fired absorption refrigerating and heating unit heat supply provided by the invention to the sketch map of air-cooled evaporimeter defrosting.
When the 5 outside frostings of second evaporimeter, open the 3rd valve 16, close second valve 19 and first valve 20.Condenser 3, throttling arrangement 10 and first evaporimeter 4 are by defrosting steam pipe 17 bypass.The solution of said generator 1 is heated; The cryogen evaporation is overflowed; Solution concentration reduces, and concentrated solution gets into absorber 2 again through after solution heat exchanger 7 and the pressure-reducing valve 9 cooling throttlings, get into absorber 2 from the condensed fluid of second evaporimeter 5 after; Solution concentration raises, and after solution heat exchanger 7 and concentrated solution heat exchange heat up, returns generator 1 by solution pump 8 again; The solution of said generator 1 is heated, and the cryogen evaporation is overflowed, and is condensed into cryogen liquid through defrosting steam pipe 17 to second evaporimeters 5, gets into absorber 2 again; Second evaporimeter 5 has absorbed the heat on the refrigerant vapor, and frost just receives heat of solution, thereby has reached the purpose of giving 5 defrostings of second evaporimeter.
Claims (3)
1. double-evaporator direct-fired absorption refrigerating and heating unit; Contain absorption-type cold-hot water dispenser group (6), cold water inlet, hot water outlet pipe, cooling water inlet pipe and cooling water outlet pipe; Said absorption-type cold-hot water dispenser group (6) comprises generator (1), condenser (3), throttling arrangement (10), first evaporimeter (4), absorber (2), solution heat exchanger (7), solution pump (8) and is arranged on the pressure-reducing valve (9) on the concentrated solution pipe (12), it is characterized in that: first valve (20) of regulating the cryogen flow is set on the cooling branch road (14) between throttling arrangement (10) and first evaporimeter (4); Between the cryogen side outlet of the inlet of first valve (20) and first evaporimeter (4), second evaporimeter (5) is set, said second evaporimeter (5) is air-cooled evaporimeter, makes second evaporimeter (5) parallelly connected with first evaporimeter (4); On the heat supply branch road (21) between throttling arrangement (10) and second evaporimeter (5), second valve (19) is set; Said hot and cold water unit (6) also comprises a defrosting steam pipe (17) that has the 3rd valve (16), and the inlet of defrosting steam pipe (17) links to each other with the outlet of generator (1), and the outlet of defrosting steam pipe (17) is connected with the outlet of described second valve (19).
2. a kind of double-evaporator direct-fired absorption refrigerating and heating unit according to claim 1 is characterized in that: said absorption-type cold-hot water dispenser group (6) is single-effective absorption hot and cold water unit or double effect absorption hot and cold water unit.
3. a kind of double-evaporator direct-fired absorption refrigerating and heating unit according to claim 1; It is characterized in that: said second evaporimeter (5) places within absorption-type cold-hot water dispenser group (6) body; Form monolithic construction; Or place outside absorption-type cold-hot water dispenser group (6) body, form split-type structural with unit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910237140XA CN101876496B (en) | 2009-11-06 | 2009-11-06 | Double-evaporator direct-fired absorption refrigerating and heating unit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910237140XA CN101876496B (en) | 2009-11-06 | 2009-11-06 | Double-evaporator direct-fired absorption refrigerating and heating unit |
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| CN101876496B true CN101876496B (en) | 2012-01-18 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102147135A (en) * | 2011-02-18 | 2011-08-10 | 王红斌 | Lithium bromide absorption type water chilling unit for direct cooling type cold-blast air evaporator |
| CN102080898A (en) * | 2011-02-22 | 2011-06-01 | 王红斌 | Lithium bromide absorbing evaporative condensing water chilling unit |
| MX2017009024A (en) * | 2015-01-08 | 2018-09-12 | Bry Air Asia Pvt Ltd | Split type sorption air conditioning unit. |
| CN105928234A (en) * | 2016-07-06 | 2016-09-07 | 上海境元能源科技有限公司 | Double-water-temperature cold and hot water unit |
| CN107461799A (en) * | 2017-07-07 | 2017-12-12 | 清华大学 | A kind of heating equipment and heat supply method |
| CN107314571B (en) * | 2017-07-11 | 2020-10-27 | 新奥（中国）燃气投资有限公司 | Heat pump system and heat recovery method thereof |
| CN108120190A (en) * | 2017-11-10 | 2018-06-05 | 山东奇威特太阳能科技有限公司 | A kind of method that absorption installation heat exchanger surface delays frosting |
| CN113048674B (en) * | 2021-03-31 | 2022-08-09 | 福州大学 | Solar thermoelectric driven two-stage ammonia absorption refrigeration system |
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