CN101806519A - Wide-temperature high-efficiency air source heat pump unit with anti-frosting function and operating method thereof - Google Patents
Wide-temperature high-efficiency air source heat pump unit with anti-frosting function and operating method thereof Download PDFInfo
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- CN101806519A CN101806519A CN 201010150153 CN201010150153A CN101806519A CN 101806519 A CN101806519 A CN 101806519A CN 201010150153 CN201010150153 CN 201010150153 CN 201010150153 A CN201010150153 A CN 201010150153A CN 101806519 A CN101806519 A CN 101806519A
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Abstract
The invention relates to an air source heat pump unit and an operating method thereof. A compressor is communicated with an indoor heat exchanger through a first on-and-off valve and a four-way reversing valve; the indoor heat exchanger is connected with a bidirectional liquid accumulator through a first one-way valve; one path is connected to the compressor through an anti-frosting coil, a third throttle valve, an outdoor heat exchanger, the four-way reversing valve, the bidirectional liquid accumulator and a second on-and-off valve; the other path is connected to the compressor through an electromagnetic valve, a second throttle valve and the second on-and-off valve; the first one-way valve is connected in parallel with the first throttle valve; the third throttle valve is connected in parallel with a second one-way valve; the compressor is communicated with the outdoor heat exchanger through the first on-and-off valve and the four-way reversing valve; and the outdoor heat exchanger is connected with the bidirectional liquid accumulator through the second one-way valve and the anti-frosting coil, and then is connected to the compressor through the first throttle valve, the indoor heat exchanger, the four-way reversing valve, the bidirectional liquid accumulator, and the second on-and-off valve. The air source heat pump unit has the advantages of wide temperature application range, frosting delay, and high-efficiency operation all year round.
Description
Technical field
The present invention relates to a kind of net for air-source heat pump units and operation method thereof.
Background technology
Present stage, the operational effect of air source heat pump was also undesirable, and its reason mainly is that the low temperature adaptability of air source heat pump is poor, and Another reason is the frosting and the defrosting of air source heat pump.
Principle from steam compression type refrigeration, when air source heat pump is applied to cold district, reduction along with outdoor environment temperature, the unit compression ratio raises, volumetric efficiency reduces, refrigerant mass fluxes descends, and heating load sharply reduces, and the compressor exhaust temperature is too high can't normally to move unit or the operational reliability reduction; Add that leaving air temp reduces, particularly indoor temperature reduces during defrosting, has had a strong impact on the comfortableness of indoor environment.
The frosting of outdoor heat exchanger, defrosting cause the stability and the reliability variation of net for air-source heat pump units operation.Frosting mainly shows two aspects to the negative effect of the operation generation of net for air-source heat pump units: the formation that is the frost layer has on the one hand increased thermal conduction resistance, has reduced the heat transfer coefficient of heat exchanger; Be that the existence of frost layer has strengthened the resistance that air flows through finned-tube evaporator on the other hand, reduced air mass flow.Along with thickening of frost layer, evaporating temperature decline, heating capacity decline, fan performance decay will appear, and phenomenons such as electric current increasing make the net for air-source heat pump units cisco unity malfunction.
We can say that the low temperature adaptability of air source heat pump is poor, knot, defrosting problem are the bottlenecks of its efficient operation of restriction.How to improve air source heat pump refrigerant flow at low temperatures, reduce delivery temperature; Under high humidity environment, delay the outdoor heat exchanger frosting and be to be related to that air source heat pump is more extensive, the key issue of more efficient operation.
Summary of the invention
The objective of the invention is at the problems referred to above, provide a kind of and have stronger temperature accommodation, can delay frosting, the wide-temperature high-efficiency air source heat pump unit and the operation method thereof with anti-frosting function of the operation of annual high efficient and reliable.
The object of the present invention is achieved like this: have compressor, indoor heat exchanger and outdoor heat exchanger, the exhaust outlet of compressor is after second valve by first first valve that opens and closes valve, four-way change-over valve, four-way change-over valve is communicated with indoor heat exchanger successively; Indoor heat exchanger is connected with two-way reservoir by first check valve, tells two the tunnel from two-way reservoir; Road opening and closing valve by the 3rd valve of frost prevention coil pipe, the 3rd choke valve, outdoor heat exchanger, four-way change-over valve, the 4th valve of four-way change-over valve, two-way reservoir, second successively and be connected wherein with the air entry of compressor; Another road wherein opens and closes valve by magnetic valve, second choke valve, second successively and is connected with the air entry of compressor; First check valve is connected in parallel to the first throttle valve reverse with the first check valve direction; The 3rd choke valve is connected in parallel and the second reverse check valve of the 3rd choke valve direction is arranged; The exhaust outlet of compressor is successively behind the 3rd valve communication chamber external heat exchanger by first first valve that opens and closes valve, four-way change-over valve, four-way change-over valve; Outdoor heat exchanger is connected with two-way reservoir by the frost prevention coil pipe by second check valve, then, opening and closing valve by first throttle valve, indoor heat exchanger, second valve of four-way change-over valve, the 4th valve of four-way change-over valve, two-way reservoir, second successively by two-way reservoir is connected with the air entry of compressor.
The present invention, its operation method: a, frost prevention operation method: the high pressure refrigerant vapor of coming out by compressor, first valve through the first keying valve and four-way change-over valve, second valve of four-way change-over valve enters the indoor heat exchanger heat release, to indoor heating, enter two-way reservoir by first check valve then, the refrigerant liquid that comes out from two-way reservoir enters the frost prevention coil pipe, improve outside air temperature, reduce relative humidity, delay frosting, enter the 3rd choke valve then, throttling becomes the refrigerant air-liquid mixture of low-temp low-pressure, and the inlet chamber external heat exchanger enters the 3rd valve of four-way change-over valve after the heat absorption vaporization, the 4th valve via four-way change-over valve, enter two-way reservoir then, further the vaporization back opens and closes valve by second and enters compressor compresses, finishes a frost prevention circulation, at this moment, closed electromagnetic valve; B, cold operation method: the high pressure refrigerant vapor of coming out by compressor, first valve through the first keying valve and four-way change-over valve, second valve of four-way change-over valve enters the indoor heat exchanger heat release, to indoor heating, enter two-way reservoir by first check valve then, the refrigerant liquid that comes out from two-way reservoir divides two-way: wherein a road enter the frost prevention coil pipe, enter the 3rd choke valve then, throttling becomes the refrigerant air-liquid mixture of low-temp low-pressure, the inlet chamber external heat exchanger, enter the 3rd valve of four-way change-over valve after the heat absorption vaporization, the 4th valve via four-way change-over valve, enter two-way reservoir then, after further back and another burst refrigerant mixed are come out from two-way reservoir in the vaporization back, open and close valve by second and enter compressor compresses, finish a cold operation circulation; Another road wherein enters the second choke valve throttling by magnetic valve, and throttling becomes gas-liquid mixture, with the refrigerant mixed of coming out from two-way reservoir, opens and closes valve by second then and enters compressor; C, Defrost operation method: the high pressure refrigerant vapor of coming out by compressor, first valve through the first keying valve and four-way change-over valve, the 3rd valve inlet chamber external heat exchanger heat release of four-way change-over valve, outdoor heat exchanger is defrosted, enter the frost prevention coil pipe by second check valve then, the refrigerant liquid that comes out from the frost prevention coil pipe enters two-way reservoir and further cools off, enter the first throttle valve then, throttling becomes the refrigerant air-liquid mixture of low-temp low-pressure, enter indoor heat exchanger, enter second valve of four-way change-over valve after the cold-producing medium heat absorption vaporization, the 4th valve via four-way change-over valve enters two-way reservoir then, after further come out from two-way reservoir in the vaporization back, open and close valve by second and enter compressor compresses, finish a defrost cycle, at this moment, closed electromagnetic valve; D, refrigerating operaton method: the high pressure refrigerant vapor of coming out by compressor, first valve through the first keying valve and four-way change-over valve, the 3rd valve inlet chamber external heat exchanger heat release of four-way change-over valve, cold-producing medium is cooled off, entering the frost prevention coil pipe by second check valve then carried out but cold, it is but cold that the refrigerant liquid that comes out from the frost prevention coil pipe enters the further mistake of two-way reservoir, enter the first throttle valve then, throttling becomes the refrigerant air-liquid mixture of low-temp low-pressure, enter indoor heat exchanger, freeze to indoor, enter second valve of four-way change-over valve after the cold-producing medium heat absorption vaporization, via the 4th valve of four-way change-over valve, enter two-way reservoir then, after further come out from two-way reservoir in the vaporization back, open and close valve by second and enter compressor compresses, finish a kind of refrigeration cycle, at this moment, closed electromagnetic valve.
1), by the liquid spraying technique the present invention has following good effect:, improve this unit refrigerant flow at low temperatures, thereby strengthen the low temperature adaptability of air source heat pump; 2), the frost prevention coil pipe is set, between outside air temperature-6～5 ℃, relative humidity starts the frost prevention circulation under the meteorological condition more than 65%, improve outside air temperature, reduces relative humidity, delays frosting; 3), adopt two-way reservoir, thereby reservoir and gas-liquid separator are united two into one, not only simplified circulatory system flow process, and can realize cold, suction superheat before the throttling with excessivelying, further improve the efficient of unit, the safe operation of assurance unit; 4), this wide-temperature high-efficiency air source heat pump unit applicability with anti-frosting function is wide, adopts the air that is available anywhere as low level heat energy, characteristics such as adapt to that China is populous, site coverage, the scale of construction are big; 5), efficiently move the whole year, zone adaptability is strong, this wide-temperature high-efficiency air source heat pump unit with anti-frosting function can be as-15 ℃ of normal operations under low outside air temperature, and obtain the higher coefficient of performance, thereby the scope of application of air source heat pump is extended on the south the Shenyang from traditional the Changjiang river, the Huanghe valley, has very strong trans-regional adaptability.
The present invention is owing to strengthen the low temperature adaptability of air source heat pump by the liquid spraying technique; The frost prevention coil pipe is set, delays frosting; Adopt two-way reservoir, simplify circulatory system flow process, further improve the efficient of unit, guarantee the safe operation of unit; By these technical measures, make that the net for air-source heat pump units of invention has stronger temperature accommodation, can delay frosting, the operation of annual high-efficiency reliable; Thereby, the present invention, the advantage of have stronger temperature accommodation, can delay frosting, annual high efficient and reliable being moved.
The present invention is further illustrated for following embodiment accompanying drawings.
Description of drawings
Fig. 1 is the structural principle schematic diagram of one embodiment of the present of invention.
Among the figure, 1, compressor; 21, first valve of four-way change-over valve; 22, second valve of four-way change-over valve; 23, the 3rd valve of four-way change-over valve; 24, the 4th valve of four-way change-over valve; 3, indoor heat exchanger; 4, two-way reservoir; 5, frost prevention coil pipe; 6, outdoor heat exchanger; 7, first open and close valve; 8, first check valve; 9, first throttle valve; 10, second open and close valve; 11, second choke valve; 12, magnetic valve; 13, the 3rd choke valve; 14, second check valve.
The specific embodiment
With reference to Fig. 1, present embodiment has compressor 1, indoor heat exchanger 3 and outdoor heat exchanger 6, and the exhaust outlet of compressor 1 is after second valve 22 by first first valve 21 that opens and closes valve 7, four-way change-over valve, four-way change-over valve is communicated with indoor heat exchangers 3 successively; Indoor heat exchanger is connected with two-way reservoir 4 by first check valve 8, tells two the tunnel from two-way reservoir; Road opening and closing valve 10 by the 3rd valve 23 of frost prevention coil pipe 5, the 3rd choke valve 13, outdoor heat exchanger 6, four-way change-over valve, the 4th valve 24 of four-way change-over valve, two-way reservoir, second successively and be connected wherein with the air entry of compressor 1; Another road wherein opens and closes valve 10 and is connected with the air entry of compressor 1 by magnetic valve 12, second choke valve 11, second successively; First check valve 8 is connected in parallel to the first throttle valve 9 reverse with the first check valve direction; The 3rd choke valve 13 is connected in parallel and the second reverse check valve 14 of the 3rd choke valve direction is arranged; The exhaust outlet of compressor 1 is successively behind the 3rd valve 23 communication chamber external heat exchangers 6 by first first valve 21 that opens and closes valve 7, four-way change-over valve, four-way change-over valve; Outdoor heat exchanger is connected with two-way reservoir 4 by frost prevention coil pipe 5 by second check valve 14, then, opening and closing valve 10 by first throttle valve 9, indoor heat exchanger 3, second valve 22 of four-way change-over valve, the 4th valve 24 of four-way change-over valve, two-way reservoir, second successively by two-way reservoir is connected with the air entry of compressor 1.
Operation method with wide-temperature high-efficiency air source heat pump unit of anti-frosting function: a, frost prevention operational mode: between outside air temperature-6～5 ℃, relative humidity is under the meteorological condition more than 65%, start the frost prevention circulation, the high pressure refrigerant vapor that come out by compressor 1 this moment, first valve 21 through the first keying valve 7 and four-way change-over valve, second valve 22 of four-way change-over valve enters indoor heat exchanger 3 heat releases, to indoor heating, enter two-way reservoir 4 by first check valve 8 then, the refrigerant liquid that comes out from two-way reservoir enters frost prevention coil pipe 5, improve outside air temperature, reduce relative humidity, delay frosting, enter the 3rd choke valve 13 then, throttling becomes the refrigerant air-liquid mixture of low-temp low-pressure, inlet chamber external heat exchanger 6, enter the 3rd valve 23 of four-way change-over valve after the heat absorption vaporization, the 4th valve 24 via four-way change-over valve, enter two-way reservoir then, further the vaporization back opens and closes valve 10 by second and enters compressor compresses, finish a frost prevention circulation, at this moment, magnetic valve 12 cuts out; B, cold operation pattern: when outside air temperature is low, start the low temperature circulation, the high pressure refrigerant vapor that come out by compressor 1 this moment, first valve 21 through the first keying valve 7 and four-way change-over valve, second valve 22 of four-way change-over valve enters indoor heat exchanger 3 heat releases, to indoor heating, enter two-way reservoir 4 by first check valve 8 then, the refrigerant liquid that comes out from two-way reservoir divides two-way: wherein a road enter frost prevention coil pipe 5, enter the 3rd choke valve 13 then, throttling becomes the refrigerant air-liquid mixture of low-temp low-pressure, inlet chamber external heat exchanger 6, enter the 3rd valve 23 of four-way change-over valve after the heat absorption vaporization, the 4th valve 24 via four-way change-over valve, enter two-way reservoir then, after further back and another burst refrigerant mixed are come out from two-way reservoir in the vaporization back, open and close valve 10 by second and enter compressor 1 compression, finish a cold operation circulation; Another road wherein enters 11 throttlings of second choke valve by magnetic valve 12, throttling becomes gas-liquid mixture, with the refrigerant mixed of coming out from two-way reservoir 4, opens and closes valve 10 by second then and enters compressor, improve the refrigerant flow of low temperature lower compression machine, thereby reduce delivery temperature; C, Defrost operation pattern: when frosting appears in system's operation, start defrost cycle, the high pressure refrigerant vapor that come out by compressor 1 this moment, first valve 21 through the first keying valve 7 and four-way change-over valve, the 3rd valve 23 inlet chamber external heat exchangers 6 heat releases of four-way change-over valve, outdoor heat exchanger 6 is defrosted, enter frost prevention coil pipe 5 by second check valve 14 then, the refrigerant liquid that comes out from the frost prevention coil pipe enters two-way reservoir 4 and further cools off, enter first throttle valve 9 then, throttling becomes the refrigerant air-liquid mixture of low-temp low-pressure, enter indoor heat exchanger 3, simultaneously for fear of the indoor cold wind that send, can close indoor blower this moment, enter second valve 22 of four-way change-over valve after the cold-producing medium heat absorption vaporization, the 4th valve 24 via four-way change-over valve enters two-way reservoir then, after further come out from two-way reservoir in the vaporization back, open and close valve 10 by second and enter compressor compresses, finish a defrost cycle, at this moment, magnetic valve 12 cuts out; D, refrigerating operaton pattern: when summer, outside air temperature was higher, the indoor refrigeration that needs, at this moment start kind of refrigeration cycle, the high pressure refrigerant vapor of coming out by compressor 1, first valve 21 through the first keying valve 7 and four-way change-over valve, the 3rd valve 23 inlet chamber external heat exchangers 6 heat releases of four-way change-over valve, cold-producing medium is cooled off, entering frost prevention coil pipe 5 by second check valve 14 then carried out but cold, it is but cold that the refrigerant liquid that comes out from the frost prevention coil pipe enters two-way reservoir 4 further mistakes, and then the refrigerating efficiency of raising system, entering first throttle valve 9 then, throttling becomes the refrigerant air-liquid mixture of low-temp low-pressure, enter indoor heat exchanger 3, freeze to indoor, enter second valve 22 of four-way change-over valve after the cold-producing medium heat absorption vaporization, via the 4th valve 24 of four-way change-over valve, enter two-way reservoir then, after further come out from two-way reservoir in the vaporization back, open and close valve 10 by second and enter compressor compresses, finish a kind of refrigeration cycle, at this moment, magnetic valve 12 cuts out.
Claims (2)
1. the wide-temperature high-efficiency air source heat pump unit with anti-frosting function has compressor (1), indoor heat exchanger (3) and outdoor heat exchanger (6), it is characterized in that:
The exhaust outlet of described compressor (1) is after second valve (22) by first first valve (21) that opens and closes valve (7), four-way change-over valve, four-way change-over valve is communicated with indoor heat exchanger (3) successively; Indoor heat exchanger is connected with two-way reservoir (4) by first check valve (8), tells two the tunnel from two-way reservoir; Road opening and closing valve (10) by the 3rd valve (23) of frost prevention coil pipe (5), the 3rd choke valve (13), outdoor heat exchanger (6), four-way change-over valve, the 4th valve (24) of four-way change-over valve, two-way reservoir, second successively and be connected wherein with the air entry of compressor (1); Another road wherein opens and closes valve (10) by magnetic valve (12), second choke valve (11), second successively and is connected with the air entry of compressor (1);
Described first check valve (8) is connected in parallel to the first throttle valve (9) reverse with the first check valve direction; Described the 3rd choke valve (13) is connected in parallel and reverse second check valve (14) of the 3rd choke valve direction is arranged; The exhaust outlet of described compressor (1) is successively behind the 3rd valve (23) the communication chamber external heat exchanger (6) by first first valve (21) that opens and closes valve (7), four-way change-over valve, four-way change-over valve; Outdoor heat exchanger is connected with two-way reservoir (4) by frost prevention coil pipe (5) by second check valve (14), then, opening and closing valve (10) by first throttle valve (9), indoor heat exchanger (3), second valve (22) of four-way change-over valve, the 4th valve (24) of four-way change-over valve, two-way reservoir, second successively by two-way reservoir is connected with the air entry of compressor (1).
2. one kind is adopted the described operation method with wide-temperature high-efficiency air source heat pump unit of anti-frosting function of claim 1, it is characterized in that:
A, frost prevention operation method: the high pressure refrigerant vapor of coming out by compressor (1), first valve (21) through the first keying valve (7) and four-way change-over valve, second valve (22) of four-way change-over valve enters indoor heat exchanger (3) heat release, to indoor heating, enter two-way reservoir (4) by first check valve (8) then, the refrigerant liquid that comes out from two-way reservoir enters frost prevention coil pipe (5), improve outside air temperature, reduce relative humidity, delay frosting, enter the 3rd choke valve (13) then, throttling becomes the refrigerant air-liquid mixture of low-temp low-pressure, inlet chamber external heat exchanger (6), enter the 3rd valve (23) of four-way change-over valve after the heat absorption vaporization, the 4th valve (24) via four-way change-over valve enters two-way reservoir then, further the vaporization back opens and closes valve (10) by second and enters compressor compresses, finish a frost prevention circulation, at this moment, magnetic valve (12) cuts out;
B, cold operation method: the high pressure refrigerant vapor of coming out by compressor (1), first valve (21) through the first keying valve (7) and four-way change-over valve, second valve (22) of four-way change-over valve enters indoor heat exchanger (3) heat release, to indoor heating, enter two-way reservoir (4) by first check valve (8) then, the refrigerant liquid that comes out from two-way reservoir divides two-way: wherein a road enter frost prevention coil pipe (5), enter the 3rd choke valve (13) then, throttling becomes the refrigerant air-liquid mixture of low-temp low-pressure, inlet chamber external heat exchanger (6), enter the 3rd valve (23) of four-way change-over valve after the heat absorption vaporization, the 4th valve (24) via four-way change-over valve, enter two-way reservoir then, after further back and another burst refrigerant mixed are come out from two-way reservoir in the vaporization back, open and close valve (10) by second and enter compressor compresses, finish a cold operation circulation; Another road wherein enters second choke valve (11) throttling by magnetic valve (12), and throttling becomes gas-liquid mixture, with the refrigerant mixed of coming out from two-way reservoir, opens and closes valve (10) by second then and enters compressor;
C, Defrost operation method: the high pressure refrigerant vapor of coming out by compressor (1), first valve (21) through the first keying valve (7) and four-way change-over valve, the 3rd valve (23) inlet chamber external heat exchanger (6) heat release of four-way change-over valve, outdoor heat exchanger is defrosted, enter frost prevention coil pipe (5) by second check valve (14) then, the refrigerant liquid that comes out from the frost prevention coil pipe enters further cooling of two-way reservoir (4), enter first throttle valve (9) then, throttling becomes the refrigerant air-liquid mixture of low-temp low-pressure, enter indoor heat exchanger (3), enter second valve (22) of four-way change-over valve after the cold-producing medium heat absorption vaporization, the 4th valve (24) via four-way change-over valve, enter two-way reservoir then, after further come out from two-way reservoir in the vaporization back, open and close valve (10) by second and enter compressor compresses, finish a defrost cycle, at this moment, magnetic valve (12) cuts out;
D, refrigerating operaton method: the high pressure refrigerant vapor of coming out by compressor (1), first valve (21) through the first keying valve (7) and four-way change-over valve, the 3rd valve (23) inlet chamber external heat exchanger (6) heat release of four-way change-over valve, cold-producing medium is cooled off, entering frost prevention coil pipe (5) by second check valve (14) then carried out but cold, it is but cold that the refrigerant liquid that comes out from frost prevention coil pipe (5) enters the further mistake of two-way reservoir (4), enter first throttle valve (9) then, throttling becomes the refrigerant air-liquid mixture of low-temp low-pressure, enter indoor heat exchanger (3), freeze to indoor, enter second valve (22) of four-way change-over valve after the cold-producing medium heat absorption vaporization, the 4th valve (24) via four-way change-over valve, enter two-way reservoir then, after further come out from two-way reservoir in the vaporization back, open and close valve (10) by second and enter compressor compresses, finish a kind of refrigeration cycle, at this moment, magnetic valve (12) cuts out.
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| CN2010101501536A CN101806519B (en) | 2010-04-19 | 2010-04-19 | Wide-temperature high-efficiency air source heat pump unit with anti-frosting function and operating method thereof |
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| CN102721240A (en) * | 2012-06-13 | 2012-10-10 | 广东澳信热泵空调有限公司 | Low-temperature heat pump air conditioner heat exchanging system with anti-icing function |
| CN102927637A (en) * | 2012-10-26 | 2013-02-13 | 安徽京奥制冷设备有限公司 | Double source heat pump air conditioning unit |
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| CN103423919A (en) * | 2012-05-23 | 2013-12-04 | 约克广州空调冷冻设备有限公司 | Air-source heat pump system and defrosting and draining method for same |
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