CN104101126A - Continuous heat-supplying phase change energy storage overlapped type air source heat pump system and operation method thereof - Google Patents
Continuous heat-supplying phase change energy storage overlapped type air source heat pump system and operation method thereof Download PDFInfo
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Abstract
The invention relates to a continuous heat-supplying phase change energy storage overlapped type air source heat pump system and an operation method thereof; the overlapped air source heat pump technology is combined with the phase change energy storage technology, a phase change heat accumulator is used as a low-grade heat source for defrosting and supplying heat to a room, so that stability and reliability of defrosting operation of the overlapped type air source heat pump are ensured, meanwhile heat can be continuously supplied to the room, and thereby stable temperature of the room is ensured, and indoor thermal comfort during a defrosting period is improved; according to the continuous heat-supplying phase change energy storage overlapped type air source heat pump system, since the phase change heat accumulator provides enough heat in the defrosting process, defrosting speed can be improved; the heat pump accumulates heat when in efficient operation, so that accumulated heat can be used for defrosting and heating when needing to defrost, and thereby space-time transfer of energy is achieved, and overall operation efficiency of the unit is improved.
Description
Technical field
The present invention relates to a kind of heating system, particularly a kind of continuous heat supply phase-changing energy-storing overlapping air source heat pump system and operation method.
Background technology
Net for air-source heat pump units is applied and will be occurred that heating capacity sharply declines under northern area winter low temperature environment, there will be delivery temperature to transfinite, the problems such as compressor protection shutdown.Adopt overlapping air source heat pump to reach to improve air source heat pump low temperature adaptability, improve the object of its low-temperature heating performance.The same with conventional air source heat pump, overlapping air source heat pump when off-premises station surface temperature is lower than air dew point and while being below the freezing point, there will be frost in heat supply running.Northern China has a lot of cities to have winter below air themperature-10 DEG C, the more than 75% low temperature and high relative humidity weather of relative humidity, the such as city such as Harbin, Changchun.Off-premises station frost can cause air source heat pump heating capacity and systematic energy efficiency ratio to reduce, and affects heat supply continuity and the reliability of air source heat pump system.In order to ensure the good running status continuously of unit, need to periodically defrost to off-premises station.The feature of general overlapping air source heat pump utilization system self adopts the method for low temperature level bypass defrost, but in defrost process, without heat supply, indoor air temperature is reduced due to indoor, affects indoor thermal comfort.In addition, experimental studies have found that, when outdoor temperature is lower than-10 DEG C of left and right, hot gas bypass defrosting method defrosting time is very long, its reason is that the suction and discharge temperature of single-stage operation is all very low, and outdoor temperature is low, the heat that compressor is produced cannot meet cold and the required heat of heat exchanger frost layer defrost that heat exchanger absorbs from environment, has more extended the indoor time without heat supply.
Summary of the invention
The present invention be directed in existing overlapping air source heat pump system defrost process indoor without heat supply, defrosting time is long, indoor comfort is poor problem, propose a kind of continuous heat supply phase-changing energy-storing overlapping air source heat pump system and operation method, can realize the overlapping air source heat pump system of normal defrosting and continuous heat supply.
Technical scheme of the present invention is: a kind of continuous heat supply phase-changing energy-storing overlapping air source heat pump system, system comprises low temperature stage compressor, high temperature stage compressor, four-way change-over valve, indoor set, off-premises station, the second electric expansion valve, the first electric expansion valve, the second gas-liquid separator, the first gas-liquid separator, evaporative condenser, phase change heat accumulator, several magnetic valve, and system comprises the circulation of low temperature level and high temperature level circulation two parts;
Low temperature level circulation: the output of low temperature stage compressor is connected with the first interface of four-way change-over valve, the second interface of four-way change-over valve divides two-way, the first via is entered phase change heat accumulator by the first magnetic valve, and another road connects the other end of phase change heat accumulator successively by the 5th magnetic valve, the 3rd magnetic valve; Between the 5th magnetic valve and the 3rd magnetic valve, connecting line divides two-way to connect evaporative condenser, and the 7th magnetic valve of leading up to enters evaporative condenser, and another road enters evaporative condenser by the 11 magnetic valve, the 9th magnetic valve successively; Between the 11 magnetic valve and the 9th magnetic valve, connecting line connects off-premises station one end by the first electric expansion valve, the other end of off-premises station is connected with the 3rd interface of four-way change-over valve, the 4th interface of four-way change-over valve is connected with the input of the first gas-liquid separator, and the output of the first gas-liquid separator is connected with the input of low temperature stage compressor;
High temperature level circulation: the output of high temperature stage compressor is connected with one end of indoor set, the other end of indoor set divides two-way to connect evaporative condenser by the second electric expansion valve, the tenth magnetic valve of leading up to connects evaporative condenser, and another road connects evaporative condenser by the 12 magnetic valve, the 8th magnetic valve successively; Between the 12 magnetic valve and the 8th magnetic valve, connecting line divides two-way to connect phase change heat accumulator, and the 4th magnetic valve of leading up to connects phase change heat accumulator, and another road connects phase change heat accumulator by the 6th magnetic valve, the second magnetic valve successively; Between the 6th magnetic valve and the second magnetic valve, connecting line connects the input of the second gas-liquid separator, and the output of the second gas-liquid separator is connected with the input of high temperature stage compressor.
An operation method for continuous heat supply phase-changing energy-storing overlapping air source heat pump system, described system is divided into normal heating mode, accumulation of heat pattern and defrosting mode,
Normal heating mode: by the first magnetic valve, the second magnetic valve, the 3rd magnetic valve, the 4th magnetic valve, the 11 magnetic valve, the 12 closed electromagnetic valve, the 5th magnetic valve, the 6th magnetic valve, the 7th magnetic valve, the 8th magnetic valve, the 9th magnetic valve, the tenth magnetic valve are opened to low temperature level circulation: be followed successively by low temperature stage compressor, four-way change-over valve, the 5th magnetic valve, the 7th magnetic valve, evaporative condenser, the 9th magnetic valve, the first electric expansion valve, off-premises station, four-way change-over valve, the first gas-liquid separator and get back to low temperature stage compressor; High temperature level circulation: be followed successively by high temperature stage compressor, indoor set, the second electric expansion valve, the tenth magnetic valve, evaporative condenser, the 8th magnetic valve, the 6th magnetic valve, the second gas-liquid separator and get back to high temperature stage compressor;
Accumulation of heat pattern: by the second magnetic valve, the 4th magnetic valve, the 5th magnetic valve, the 11 magnetic valve, the 12 closed electromagnetic valve, by the first magnetic valve, the 3rd magnetic valve, the 6th magnetic valve, the 7th magnetic valve, the 8th magnetic valve, the 9th magnetic valve, the tenth magnetic valve is opened, low temperature level circulation: be followed successively by low temperature stage compressor, four-way change-over valve, the first magnetic valve, phase change heat accumulator, the 3rd magnetic valve, the 7th magnetic valve, evaporative condenser, the 9th magnetic valve, the first electric expansion valve, off-premises station, four-way change-over valve, the first gas-liquid separator is got back to low temperature stage compressor, high temperature level circulation: be followed successively by high temperature stage compressor, indoor set, the second electric expansion valve, the tenth magnetic valve, evaporative condenser, the 8th magnetic valve, the 6th magnetic valve, the second gas-liquid separator and get back to high temperature stage compressor,
Defrosting mode: by the 5th magnetic valve, the 6th magnetic valve, the 7th magnetic valve, the 8th magnetic valve, the 9th magnetic valve, the tenth closed electromagnetic valve, the first magnetic valve, the second magnetic valve, the 3rd magnetic valve, the 4th magnetic valve, the 11 magnetic valve, the 12 magnetic valve are opened to low temperature level circulation: be followed successively by low temperature stage compressor, four-way change-over valve, off-premises station, the first electric expansion valve, the 11 magnetic valve, the 3rd magnetic valve, phase change heat accumulator, the first magnetic valve, four-way change-over valve, the first gas-liquid separator and get back to low temperature stage compressor; High temperature level circulation: high temperature stage compressor, indoor set, the second electric expansion valve, the 12 magnetic valve, the 4th magnetic valve, phase change heat accumulator, the second magnetic valve, the second gas-liquid separator are got back to high temperature stage compressor.
Beneficial effect of the present invention is: continuous heat supply phase-changing energy-storing overlapping air source heat pump system of the present invention and operation method, overlapping air source heat pump technology is combined with phase-changing energy-storing technology, utilize phase change heat accumulator as defrosting with to the low level heat energy of indoor heating, ensure stability and the reliability of the operation of overlapping air source heat pump defrosting, indoor uninterrupted heat supply simultaneously, thereby ensure that room temperature is stable, indoor thermal comfort degree during raising defrosting; The present invention, because phase change heat accumulator provides enough heats in defrost process, can improve defrosting speed; Due to heat pump accumulation of heat when the efficient operation, in the time need to defrosting by the heat storing for defrosting, heat supply, realized the Time-spatial diversion of energy, improved the overall operation efficiency of unit.
Brief description of the drawings
Fig. 1 is continuous heat supply phase-changing energy-storing overlapping air source heat pump system structural representation of the present invention.
Detailed description of the invention
Continuous heat supply phase-changing energy-storing overlapping air source heat pump system structural representation as shown in Figure 1, system comprises low temperature stage compressor 1, high temperature stage compressor 2, four-way change-over valve 3, indoor set 4, off-premises station 5, the second electric expansion valve 6, the first electric expansion valve 7, the second gas-liquid separator 8, the first gas-liquid separator 9, evaporative condenser 10, phase change heat accumulator 11, magnetic valve F1, magnetic valve F2, magnetic valve F3, magnetic valve F4, magnetic valve F5, magnetic valve F6, magnetic valve F7, magnetic valve F8, magnetic valve F9, magnetic valve F10, magnetic valve F11, magnetic valve F12.Described system comprises the circulation of low temperature level and high temperature level circulation two parts.
For low temperature level: the output of low temperature stage compressor 1 is connected with the first interface of four-way change-over valve 3, the second interface of four-way change-over valve 3 divides two-way, the first via is entered phase change heat accumulator 11 by magnetic valve F1, and another road connects the other end of phase change heat accumulator 11 successively by magnetic valve F5, magnetic valve F3.Between magnetic valve F5 and magnetic valve F3, connecting line divides two-way to connect evaporative condenser 10, and the magnetic valve F7 of leading up to enters evaporative condenser 10, and another road enters evaporative condenser 10 by magnetic valve F11, magnetic valve F9 successively.Between magnetic valve F11 and magnetic valve F9, connecting line connects off-premises station 5 one end by the first electric expansion valve 7, the other end of off-premises station 5 is connected with the 3rd interface of four-way change-over valve 3, the 4th interface of four-way change-over valve 3 is connected with the input of the first gas-liquid separator 9, and the output of the first gas-liquid separator 9 is connected with the input of low temperature stage compressor 1.
For high temperature level: the output of high temperature stage compressor 2 is connected with one end of indoor set 4, the other end of indoor set 4 connects evaporative condenser 10 by 6 points of two-way of the second electric expansion valve, the magnetic valve F10 of leading up to connects evaporative condenser 10, and another road connects evaporative condenser 10 by magnetic valve F12, magnetic valve F8 successively.Between magnetic valve F12 and magnetic valve F8, connecting line divides two-way to connect phase change heat accumulator 11, and the magnetic valve F4 of leading up to connects phase change heat accumulator 11, and another road connects phase change heat accumulator 11 by magnetic valve F6, magnetic valve F2 successively.Between magnetic valve F6 and magnetic valve F2, connecting line connects the input of the second gas-liquid separator 8, and the output of the second gas-liquid separator 8 is connected with the input of high temperature stage compressor 2.
Operation principle:
When accumulation of heat duty, between low temperature stage compressor 1, four-way change-over valve 3, phase change heat accumulator 11, evaporative condenser 10, the first electric expansion valve 7, off-premises station 5, four-way change-over valve 3, the first gas-liquid separator 9, low temperature stage compressor 1, series connection forms closed circuit, low temperature stage compressor 1 is delivered to the heat on off-premises station respectively in phase change heat accumulator 11 and evaporative condenser 10, makes the phase-change material accumulation of heat in phase change heat accumulator 11.High temperature stage compressor 2, indoor set 4, connect with the second electric expansion valve 6, evaporative condenser 10, the second gas-liquid separator 8, high temperature stage compressor 2, high temperature stage compressor 2 is delivered to the heat of evaporative condenser 10 in indoor set 4.
When defrosting duty, low temperature stage compressor 1, four-way change-over valve 3, off-premises station 5, the first electric expansion valve 7, phase change heat accumulator 11, between four-way change-over valve 3, the first gas-liquid separator 9, low temperature stage compressor 1, series connection forms closed circuit, low temperature stage compressor 1 is delivered on off-premises station 5 phase change heat accumulator 11 heats for defrosting, makes the phase-change material heat release in phase change heat accumulator 11.High temperature stage compressor 2, indoor set 4, connect with the second electric expansion valve 6, phase change heat accumulator 11, the second gas-liquid separator 8, high temperature stage compressor 2, high temperature stage compressor 2 is delivered to the heat of phase change heat accumulator 11 in indoor set 4.
The present invention's new system of one that to be thought based on energy Time-spatial diversion organically combine overlapping air source heat pump technology and phase-changing energy-storing technology.This system is utilized air source heat pump from air, to extract heat and heat is stored in phase-changing energy-storing device, in the time that needs defrost, the heat of storage is taken out to defrosting and hold concurrently to room heat supply winter.System running pattern can be divided into normal heating mode, accumulation of heat pattern and defrosting mode.
One, normal heating mode
Magnetic valve F1, magnetic valve F2, magnetic valve F3, magnetic valve F4, magnetic valve F11, magnetic valve F12 are closed, magnetic valve F5, magnetic valve F6, magnetic valve F7, magnetic valve F8, magnetic valve F9, magnetic valve F10 are opened.The flow process of whole system is to circulate for low temperature level: low temperature stage compressor 1 → four-way change-over valve 3 → magnetic valve F5 → magnetic valve F7 → evaporative condenser 10 → magnetic valve F9 → the first electric expansion valve 7 → off-premises station 5 → four-way change-over valve 3 → the first gas-liquid separator 9 → low temperature stage compressors 1; Circulate for high temperature level: high temperature stage compressor 2 → indoor set 4 → the second electric expansion valve 6 → magnetic valve F10 → evaporative condenser 10 → magnetic valve F8 → magnetic valve F6 → the second gas-liquid separator 8 → high temperature stage compressors 2.
Two, accumulation of heat pattern
Magnetic valve F2, magnetic valve F4, magnetic valve F5, magnetic valve F11, magnetic valve F12 are closed, magnetic valve F1, magnetic valve F3, magnetic valve F6, magnetic valve F7, magnetic valve F8, magnetic valve F9, magnetic valve F10 are opened.The flow process of whole system is to circulate for low temperature level: low temperature stage compressor 1 → four-way change-over valve 3 → magnetic valve F1 → phase change heat accumulator 11 → magnetic valve F3 → magnetic valve F7 → evaporative condenser 10 → magnetic valve F9 → the first electric expansion valve 7 → off-premises station 5 → four-way change-over valve 3 → the first gas-liquid separator 9 → low temperature stage compressors 1; Circulate for high temperature level: high temperature stage compressor 2 → indoor set 4 → the second electric expansion valve 6 → magnetic valve F10 → evaporative condenser 10 → magnetic valve F8 → magnetic valve F6 → the second gas-liquid separator 8 → high temperature stage compressors 2.
Three, defrosting mode
Magnetic valve F5, magnetic valve F6, magnetic valve F7, magnetic valve F8, magnetic valve F9, magnetic valve F10 are closed, magnetic valve F1, magnetic valve F2, magnetic valve F3, magnetic valve F4, magnetic valve F11, magnetic valve F12 are opened.The flow process of whole system is to circulate for low temperature level: low temperature stage compressor 1 → four-way change-over valve 3 → off-premises station 5 → the first electric expansion valve 7 → magnetic valve F11 → magnetic valve F3 → phase change heat accumulator 11 → magnetic valve F1 → four-way change-over valve 3 → the first gas-liquid separator 9 → low temperature stage compressors 1; Circulate for high temperature level: high temperature stage compressor 2 → indoor set 4 → the second electric expansion valve 6 → magnetic valve F12 → magnetic valve F4 → phase change heat accumulator 11 → magnetic valve F2 → the second gas-liquid separator 8 → high temperature stage compressors 2.
Claims (2)
1. a continuous heat supply phase-changing energy-storing overlapping air source heat pump system, it is characterized in that, system comprises low temperature stage compressor (1), high temperature stage compressor (2), four-way change-over valve (3), indoor set (4), off-premises station (5), the second electric expansion valve (6), the first electric expansion valve (7), the second gas-liquid separator (8), the first gas-liquid separator (9), evaporative condenser (10), phase change heat accumulator (11), the second pipeline (12), several magnetic valve, and system comprises the circulation of low temperature level and high temperature level circulation two parts;
Low temperature level circulation: the output of low temperature stage compressor (1) is connected with the first interface of four-way change-over valve (3), the second interface of four-way change-over valve (3) divides two-way, the first via is entered phase change heat accumulator (11) by the first magnetic valve (F1), and another road connects the other end of phase change heat accumulator (11) successively by the 5th magnetic valve (F5), the 3rd magnetic valve (F3); Between the 5th magnetic valve (F5) and the 3rd magnetic valve (F3), connecting line divides two-way to connect evaporative condenser (10), the 7th magnetic valve (F7) of leading up to enters evaporative condenser (10), and another road enters evaporative condenser (10) by the 11 magnetic valve (F11), the 9th magnetic valve (F9) successively; Between the 11 magnetic valve (F11) and the 9th magnetic valve (F9), connecting line connects off-premises station (5) one end by the first electric expansion valve (7), the other end of off-premises station (5) is connected with the 3rd interface of four-way change-over valve (3), the 4th interface of four-way change-over valve (3) is connected with the input of the first gas-liquid separator (9), and the output of the first gas-liquid separator (9) is connected with the input of low temperature stage compressor (1);
High temperature level circulation: the output of high temperature stage compressor (2) is connected with one end of indoor set (4), the other end of indoor set (4) connects evaporative condenser (10) by the second electric expansion valve (6) point two-way, the tenth magnetic valve (F10) of leading up to connects evaporative condenser (10), and another road connects evaporative condenser (10) by the 12 magnetic valve (F12), the 8th magnetic valve (F8) successively; Between the 12 magnetic valve (F12) and the 8th magnetic valve (F8), connecting line divides two-way to connect phase change heat accumulator (11), the 4th magnetic valve (F4) of leading up to connects phase change heat accumulator (11), and another road connects phase change heat accumulator (11) by the 6th magnetic valve (F6), the second magnetic valve (F2) successively; Between the 6th magnetic valve (F6) and the second magnetic valve (F2), connecting line connects the input of the second gas-liquid separator (8), and the output of the second gas-liquid separator (8) is connected with the input of high temperature stage compressor (2).
2. the operation method of system according to claim 1, is characterized in that, described system is divided into normal heating mode, accumulation of heat pattern and defrosting mode,
Normal heating mode: by the first magnetic valve, the second magnetic valve, the 3rd magnetic valve, the 4th magnetic valve, the 11 magnetic valve, the 12 closed electromagnetic valve, by the 5th magnetic valve, the 6th magnetic valve, the 7th magnetic valve, the 8th magnetic valve, the 9th magnetic valve, the tenth magnetic valve is opened, low temperature level circulation: be followed successively by low temperature stage compressor (1), four-way change-over valve (3), the 5th magnetic valve (F5), the 7th magnetic valve (F7), evaporative condenser (10), the 9th magnetic valve (F9), the first electric expansion valve (7), off-premises station (5), four-way change-over valve (3), the first gas-liquid separator (9) is got back to low temperature stage compressor (1), high temperature level circulation: be followed successively by high temperature stage compressor (2), indoor set (4), the second electric expansion valve (6), the tenth magnetic valve (F10), evaporative condenser (10), the 8th magnetic valve (F8), the 6th magnetic valve (F6), the second gas-liquid separator (8) and get back to high temperature stage compressor (2),
Accumulation of heat pattern: by the second magnetic valve, the 4th magnetic valve, the 5th magnetic valve, the 11 magnetic valve, the 12 closed electromagnetic valve, by the first magnetic valve, the 3rd magnetic valve, the 6th magnetic valve, the 7th magnetic valve, the 8th magnetic valve, the 9th magnetic valve, the tenth magnetic valve is opened, low temperature level circulation: be followed successively by low temperature stage compressor (1), four-way change-over valve (3), the first magnetic valve (F1), phase change heat accumulator (11), the 3rd magnetic valve (F3), the 7th magnetic valve (F7), evaporative condenser (10), the 9th magnetic valve (F9), the first electric expansion valve (7), off-premises station (5), four-way change-over valve (3), the first gas-liquid separator (9) is got back to low temperature stage compressor (1), high temperature level circulation: be followed successively by high temperature stage compressor (2), indoor set (4), the second electric expansion valve (6), the tenth magnetic valve (F10), evaporative condenser (10), the 8th magnetic valve (F8), the 6th magnetic valve (F6), the second gas-liquid separator (8) and get back to high temperature stage compressor (2),
Defrosting mode: by the 5th magnetic valve, the 6th magnetic valve, the 7th magnetic valve, the 8th magnetic valve, the 9th magnetic valve, the tenth closed electromagnetic valve, by the first magnetic valve, the second magnetic valve, the 3rd magnetic valve, the 4th magnetic valve, the 11 magnetic valve, the 12 magnetic valve is opened, low temperature level circulation: be followed successively by low temperature stage compressor (1), four-way change-over valve (3), off-premises station (5), the first electric expansion valve (7), the 11 magnetic valve, the 3rd magnetic valve, phase change heat accumulator (11), the first magnetic valve, four-way change-over valve (3), the first gas-liquid separator (9) is got back to low temperature stage compressor (1), high temperature level circulation: high temperature stage compressor (2), indoor set (4), the second electric expansion valve (6), the 12 magnetic valve (F12), the 4th magnetic valve (F4), phase change heat accumulator (11), the second magnetic valve (F2), the second gas-liquid separator (8) are got back to high temperature stage compressor (2).
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| CN110779241A (en) * | 2019-11-25 | 2020-02-11 | 开平市高美空调设备有限公司 | Overlapping type energy storage defrosting device of air source heat pump |
| CN115013889A (en) * | 2022-06-21 | 2022-09-06 | 同济大学 | Environment-independent type runner dehumidification regeneration system |
| CN116182432B (en) * | 2023-02-22 | 2024-04-19 | 大连理工大学 | Overlapping type compressed PVT-air source heat pump system for supplying heat without intermittent defrosting alternately |
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