CN2886463Y - Defrosting apparatus for air-source heat pump water chiller-heater unit - Google Patents
Defrosting apparatus for air-source heat pump water chiller-heater unit Download PDFInfo
- Publication number
- CN2886463Y CN2886463Y CN 200620072350 CN200620072350U CN2886463Y CN 2886463 Y CN2886463 Y CN 2886463Y CN 200620072350 CN200620072350 CN 200620072350 CN 200620072350 U CN200620072350 U CN 200620072350U CN 2886463 Y CN2886463 Y CN 2886463Y
- Authority
- CN
- China
- Prior art keywords
- valve
- heat exchanger
- fin
- defrosting
- termination
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Landscapes
- Air Conditioning Control Device (AREA)
Abstract
In the four-way valve (1) of the defrosting device of an air source heat pump cold and hot water unit, the a end is connected with finned heat exchanger (8), the b end is connected with a compressor (5), the c end is connected with the e end of a heat exchanger on the side of water (12), the d end is connected with gas-liquid segregator (9), wherein the outlet of the gas-liquid segregator is connected with the compressor, the f end of the heat exchanger on the side of water (12) respectively is connected with the first one-way valve (13) and the second one-way valve (14), while an accumulator (7), a filter (11), a supplying magnetic valve (2), an electronic expansion valve (6) sequences in series. One end of the defrosting magnetic valve (4) is connected with an auxiliary defrosting magnetic valve (10), while the other end is connected between the supplying magnetic valve (2) and the electronic expansion valve (6). A finned temperature sensor (31) is installed on fin of the finned heat exchanger. A defrosting pressure sensor (32) is arranged on the junction circuit of the a end of the four-way valve (1) and the finned heat exchanger (8). The air inlet and outlet of the finned heat exchanger is equipped with the finned temperature sensor (33).
Description
Technical field
The utility model relates to a kind of Defrost method of air source heat pump system and realizes the device of this method, belongs to the technical field of refrigerant system design and manufacturing.
Background technology
Air Resource Heat Pump Unit since have energy-conservationly take into account cold and heat supply, use flexibly, convenient, initial cost is few, institute takes up space, and advantage such as little is used widely in the most of area of China.But the greatest problem that Air Resource Heat Pump Unit runs into during heating operation in the winter time is the evaporator surface frosting, because the formation and the growth of frost layer, strengthened the heat transfer resistance between evaporator surface and air, flow resistance when having increased air communication pervaporation device, make that heat exchange efficiency obviously reduces, and causes being descended by heat exchange amount between air and the evaporimeter by the air mass flow decline of evaporimeter, the working condition of source pump worsens, even cisco unity malfunction.Defrosting in good time when therefore air-cooled heat pump moves under frosting condition.
Be to realize to net for air-source heat pump units Defrost method commonly used at present by system's reverse circulation (kind of refrigeration cycle).But there is series of malpractice in this traditional cross valve reverse cycle defrost method: during defrosting because cross valve commutation, the original high-low pressure of refrigeration system partly switches, this makes refrigeration system compressor " oil of running quickly " phenomenon, the reliability and the service life of reducing compressor occur; Cold-producing medium will be used for defrosting by draw heat during defrosting from heating system, and this causes the rapid fluctuation of heat supply coolant-temperature gage, thereby has influenced the comfortableness of air-conditioning system; Begin to finish to defrosting from defrosting simultaneously, cross valve will move twice, and the high-low pressure of system partly need switch and rebulids the pressure and temperature balance again twice, and this not only causes a large amount of energy losses but also makes the total time lengthening of system's defrost process.
Summary of the invention
Technical problem: the utility model is for solving many drawbacks that existing cross valve reverse cycle defrost mode brings for refrigeration system, a kind of reliability height is provided, shorten defrosting time, improve defrosting effect, improve the defroster of the Air Resource Heat Pump Unit of source pump heating efficiency and air-conditioning system comfortableness.
Technical scheme: a termination fin-tube heat exchanger of cross valve in the defroster of Air Resource Heat Pump Unit of the present utility model, b termination compressor, the e of c termination water-side heat end, d termination gas-liquid separator, gas-liquid separator go out the termination compressor; The f end of water-side heat connects first check valve, second check valve respectively, another termination the 3rd check valve of first check valve, another termination the 4th check valve of second check valve, the other end of the 3rd check valve, the 4th check valve are connected and defrosting pilot solenoid valve and fin-tube heat exchanger join; Reservoir, filter, liquid supply electromagnetic valve, electric expansion valve are connected in series in proper order, between a termination first check valve and the 3rd check valve of its reservoir, between a termination second check valve and the 4th check valve of electric expansion valve; The one termination defrosting pilot solenoid valve of defrosting magnetic valve, between another termination liquid supply electromagnetic valve and electric expansion valve of defrosting magnetic valve, the fin temperature sensor is installed on the fin of fin-tube heat exchanger, the defrosting pressure sensor is installed on the connecting line that a of fin-tube heat exchanger and cross valve holds, and the air intlet that environment temperature sensor is installed in fin-tube heat exchanger goes out.
Air Resource Heat Pump Unit Defrost method of the present invention is: utilize the defrost circuit of refrigeration system compressor blast pipe to the electric expansion valve, before the HTHP exhaust of compressor directly guided to electric expansion valve, through the isenthalpic throttling of electric expansion valve compressor air-discharging is introduced in the fin-tube heat exchanger again, utilize the heat of compressor air-discharging that the frost layer of fin-tube heat exchanger fin side is removed, simultaneously by regulating the electronic expansion valve controls refrigerant flow, the assurance cold-producing medium only carries out the sensible heat exchange and does not carry out condensation in fin-tube heat exchanger, promptly be to utilize the sensible heat of cold-producing medium and do not comprise that latent heat defrosts, cross valve does not commutate in defrost process, and original like this variety of issue that is brought because of the cross valve reverse cycle defrost has all obtained avoiding.
When normally heating, fin-tube heat exchanger is the evaporimeter as system, and evaporation therein after the throttling of cold-producing medium process electric expansion valve becomes superheated steam at last.This process cold-producing medium draw heat from air, the frost layer temperature of evaporator surface is approximately equal to evaporating temperature but all is lower than environment temperature at this moment.When carrying out sensible heat defrost, cold-producing medium begins to be cooled in fin-tube heat exchanger, and the cold-producing medium cooling is passed to frost layer and air with heat through tube wall simultaneously, and the frost layer begins heat absorption and melts.Along with the continuation of cold-producing medium is flowed, cold-producing medium is further lowered the temperature, can this moment, cold-producing medium the condensation because emitting latent heat? can see that from Fig. 1 pressure-enthalpy chart the uncondensable condition of cold-producing medium is that the pairing saturation temperature of refrigerant pressure is lower than the outer frost layer temperature of pipe in the fin-tube heat exchanger.Because at this moment cold-producing medium is had no idea its condensation latent heat discharging, cold-producing medium can only be cooled to equate with frost layer temperature at most.When normally heating, at this moment the temperature of fin-tube heat exchanger surface frost layer is minimum also just is approximately equal to the pairing evaporating temperature of pressure in the heat exchanger.Therefore when defrosting in the fin-tube heat exchanger the uncondensable condition of cold-producing medium be that its refrigerant pressure get final product when refrigerant pressure was lower than normal heating operation in the control fin-tube heat exchanger, or the pairing saturation temperature of refrigerant pressure is lower than fin-tube heat exchanger surface frost layer temperature in the control fin-tube heat exchanger.
Therefore guarantee that the key that sensible heat defrost normally moves (cold-producing medium only carries out the sensible heat exchange and not condensation in fin-tube heat exchanger) is in the whole defrost process refrigerant pressure in the fin-tube heat exchanger to be controlled.And the aperture by the control electric expansion valve changes and the defrosting pilot solenoid valve just can be realized adjusting to refrigerant pressure in the fin-tube heat exchanger, thereby realizes that sensible heat defrost circulates, and shortens defrosting time as far as possible.
Beneficial effect: the advantage of this Defrost mode is: four-way change-over valve does not need action in defrost process, and " oil of running quickly " phenomenon, the reliability and the service life of improving compressor can not appear in refrigeration system compressor; During defrosting cold-producing medium not from heating system draw heat be used for defrosting, make heating system coolant-temperature gage fluctuation very little, improved the comfortableness of air-conditioning system; Begin to finish from defrosting to defrosting, four-way change-over valve does not need to move twice, avoid system's high-low pressure partly to switch twice and rebulid a large amount of energy losses that the pressure and temperature balance is brought again, total time of system's defrost process is shortened, improve the unit interval heat input rate of heat pump.
Description of drawings
Fig. 1 is the circulation theory figure that the utility model source pump Defrost mode is represented on pressure-enthalpy chart.
Fig. 2 is an installation drawing of realizing the utility model Air Resource Heat Pump Unit Defrost mode.
Have among the above figure: cross valve 1, liquid supply electromagnetic valve 2, fin temperature sensor 31, defrosting pressure sensor 32, environment temperature sensor 33, defrosting magnetic valve 4, compressor 5, electric expansion valve 6, reservoir 7, fin-tube heat exchanger 8, gas-liquid separator 9, defrosting pilot solenoid valve 10, filter 11, water-side heat 12, the first check valves 13, second check valve, 14, the three check valves, 15, the four check valves 16.
The specific embodiment
It can approximate representation be the process of compression from initial to termination that three process: process 1-2 represent compressor that sensible heat defrost circulates on the pressure-enthalpy chart.Cold-producing medium is compressed into the gas of HTHP from the gas of low-temp low-pressure in this process.The refrigerant gas that process 2-3 represents HTHP becomes the gas of high-temperature low-pressure after through the electric expansion valve throttling.Process 3-1 represents that the refrigerant gas of high-temperature low-pressure lowers the temperature in air heat exchanger, emit heat, also is the process of white melting layer on the heat exchanger fin simultaneously.
The a termination fin-tube heat exchanger 8 of cross valve 1 in this device, b termination compressor 5, the e end of c termination water-side heat 12, d termination gas-liquid separator 9, gas-liquid separator 9 go out termination compressor 5; The f end of water-side heat 12 connects first check valve 13, second check valve 14 respectively, another termination the 3rd check valve 15 of first check valve 13, another termination the 4th check valve 16, the three check valves 15 of second check valve 14, the other end of the 4th check valve 16 are connected and defrosting pilot solenoid valve 10 and fin-tube heat exchanger 8 join; Reservoir 7, filter 11, liquid supply electromagnetic valve 2, electric expansion valve 6 orders are connected in series, between a termination first check valve 13 and the 3rd check valve 15 of its reservoir 7, between a termination second check valve 14 and the 4th check valve 16 of electric expansion valve 6; The one termination defrosting pilot solenoid valve 10 of defrosting magnetic valve 4, between another termination liquid supply electromagnetic valve 2 and electric expansion valve 6 of defrosting magnetic valve 4, fin temperature sensor 31 is installed on the fin of fin-tube heat exchanger 8, defrosting pressure sensor 32 is installed on the connecting line of fin-tube heat exchanger 8 and a end of cross valve 1, and the air intlet that environment temperature sensor 33 is installed in fin-tube heat exchanger 8 goes out.
The device flow chart that the sensible heat defrost mode realizes by environment temperature sensor testing environment temperature, detects pressure in the air heat exchanger by the defrosting pressure sensor, and this pressure is converted to the cold-producing medium evaporating temperature as shown in Figure 2.Along with the heating operation of source pump under frozen condition, the thickness of frost layer will constantly increase on the air heat exchanger, and the difference of environment temperature and evaporating temperature also constantly increases, and the difference of environment temperature and evaporating temperature can characterize the degree of frosting in the air heat exchanger.Therefore when this difference reaches certain value, can be used as the defrosting enabling signal, the refrigeration system defrost cycle that brings into operation.
The detailed process of defrost cycle on device is: 1, cross valve is failure to actuate, and liquid supply electromagnetic valve is closed, and stops feed flow in evaporimeter, and the defrosting magnetic valve is opened; 2, cold-producing medium is discharged through after the compressor compresses, because of liquid supply electromagnetic valve is closed, before cold-producing medium will arrive electric expansion valve by the defrosting magnetic valve; 3, the refrigerant superheat steam of HTHP becomes the refrigerant vapour of low-voltage high-temperature by electric expansion valve throttling step-down; 4, the cold-producing medium of high-temperature low-pressure enters fin-tube heat exchanger through behind the check valve after the throttling, and heat is emitted in cooling simultaneously in the flow process of finned tube exchanger, and frost layer on the heat exchanger fin is removed; 5, cold-producing medium comes out from fin-tube heat exchanger, enters compressor through cross valve, gas-liquid separator; 6, compressor absorption low-temp low-pressure gas compresses and discharges.When pressure in the finned tube exchanger is too low, enter heat exchanger by opening defrosting pilot solenoid valve part of refrigerant capable of bypass, carry out in the system of assurance under the prerequisite of sensible heat defrost circulation, improve the pressure in the finned tube exchanger as far as possible, to shorten defrosting time, conserve energy.
In defrost process, realize the adjusting of refrigerant flow in the finned tube exchanger, guarantee that cold-producing medium only carries out the sensible heat exchange in heat exchanger, and do not carry out the latent heat exchange, both cold-producing medium not condensations of only lowering the temperature by control electronic expansion valve opening and defrosting pilot solenoid valve.
Carrying out along with defrost process, the frost layer of fin-tube heat exchanger fin surface constantly melts, can record the outlet fin temperature of fin-tube heat exchanger by the fin temperature sensor, white stratification when waiting this temperature to reach a certain value on (as 10 ℃) expression fin-tube heat exchanger to the greatest extent, finish defrost cycle this moment, close the defrosting magnetic valve, open liquid supply electromagnetic valve and restart to heat circulation.
Claims (1)
1. the defroster of an Air Resource Heat Pump Unit, the a termination fin-tube heat exchanger (8) that it is characterized in that cross valve in this device (1), b termination compressor (5), the e end of c termination water-side heat (12), d termination gas-liquid separator (9), gas-liquid separator (9) go out termination compressor (5); The f end of water-side heat (12) connects first check valve (13), second check valve (14) respectively, another termination the 3rd check valve (15) of first check valve (13), another termination the 4th check valve (16) of second check valve (14), the other end of the 3rd check valve (15), the 4th check valve (16) are connected and defrosting pilot solenoid valve (10) and fin-tube heat exchanger (8) join; Reservoir (7), filter (11), liquid supply electromagnetic valve (2), electric expansion valve (6) order are connected in series, between one termination, first check valve (13) and the 3rd check valve (15) of its reservoir (7), between a termination second check valve (14) and the 4th check valve (16) of electric expansion valve (6); The one termination defrosting pilot solenoid valve (10) of defrosting magnetic valve (4), between another termination liquid supply electromagnetic valve (2) and electric expansion valve (6) of defrosting magnetic valve (4), fin temperature sensor (31) is installed on the fin of fin-tube heat exchanger (8), defrosting pressure sensor (32) is installed on the connecting line of a end of fin-tube heat exchanger (8) and cross valve (1), and the air intlet that environment temperature sensor (33) is installed in fin-tube heat exchanger (8) goes out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620072350 CN2886463Y (en) | 2006-04-19 | 2006-04-19 | Defrosting apparatus for air-source heat pump water chiller-heater unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620072350 CN2886463Y (en) | 2006-04-19 | 2006-04-19 | Defrosting apparatus for air-source heat pump water chiller-heater unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2886463Y true CN2886463Y (en) | 2007-04-04 |
Family
ID=37961551
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620072350 Expired - Lifetime CN2886463Y (en) | 2006-04-19 | 2006-04-19 | Defrosting apparatus for air-source heat pump water chiller-heater unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2886463Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100432583C (en) * | 2006-04-19 | 2008-11-12 | 东南大学 | Defrosting apparatus and method for air-source heat pump water chiller-heater unit |
| CN103196262A (en) * | 2013-04-19 | 2013-07-10 | 洛阳中懋环保设备有限公司 | Hot gas bypass defrosting device for air source heat pump water heater |
| CN103363614A (en) * | 2012-03-26 | 2013-10-23 | 珠海格力电器股份有限公司 | Air-cooling chilled and hot water air conditioning unit, and defrosting control method and device therefor |
| CN105157293A (en) * | 2015-09-23 | 2015-12-16 | 广东美的暖通设备有限公司 | Water cooling and heating machine of air cooled heat pump and defrosting control method for water cooling and heating machine |
| CN108917248A (en) * | 2018-08-30 | 2018-11-30 | 李国华 | A kind of defrosting control method of air source heat pump |
-
2006
- 2006-04-19 CN CN 200620072350 patent/CN2886463Y/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100432583C (en) * | 2006-04-19 | 2008-11-12 | 东南大学 | Defrosting apparatus and method for air-source heat pump water chiller-heater unit |
| CN103363614A (en) * | 2012-03-26 | 2013-10-23 | 珠海格力电器股份有限公司 | Air-cooling chilled and hot water air conditioning unit, and defrosting control method and device therefor |
| CN103363614B (en) * | 2012-03-26 | 2016-03-23 | 珠海格力电器股份有限公司 | Wind cooling cold and hot water air-conditioner set and defrosting control method thereof and device |
| CN103196262A (en) * | 2013-04-19 | 2013-07-10 | 洛阳中懋环保设备有限公司 | Hot gas bypass defrosting device for air source heat pump water heater |
| CN105157293A (en) * | 2015-09-23 | 2015-12-16 | 广东美的暖通设备有限公司 | Water cooling and heating machine of air cooled heat pump and defrosting control method for water cooling and heating machine |
| CN105157293B (en) * | 2015-09-23 | 2017-10-31 | 广东美的暖通设备有限公司 | Air-cooled heat pump cold-hot water machine and its defrosting control method |
| CN108917248A (en) * | 2018-08-30 | 2018-11-30 | 李国华 | A kind of defrosting control method of air source heat pump |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100432583C (en) | Defrosting apparatus and method for air-source heat pump water chiller-heater unit | |
| CN106907877B (en) | A kind of double evaporators alternately defrosting net for air-source heat pump units and its Defrost method | |
| CN200955881Y (en) | Continuous defrosting and heating air source heat pump | |
| CN2802328Y (en) | Energy-storage compound air-conditioning system | |
| CN102563974B (en) | Coupling injection enthalpy-increasing air source heat pump system | |
| CN102654324A (en) | Twin-stage compression heat pump system with hot gas bypass defrosting device | |
| CN108759210B (en) | Defrosting system based on air source heat pump | |
| CN106288562A (en) | The defrosting of a kind of air source heat pump system controls devices and methods therefor | |
| CN100565048C (en) | Energy-saving refrigeration system of hot gas frost melting | |
| CN2886463Y (en) | Defrosting apparatus for air-source heat pump water chiller-heater unit | |
| CN102759193A (en) | Air source heat pump system | |
| CN109269140B (en) | Air source heat pump unit capable of continuously supplying heat and defrosting | |
| CN201126287Y (en) | Defrosting device of heat pump units | |
| CN201637184U (en) | Energy-saving refrigerating house and quick-freeze tunnel refrigeration equipment thereof | |
| CN201463433U (en) | Hot air defroster for multi-set parallel evaporator refrigeration system | |
| CN1485588B (en) | Dual-purpose multiple operating mode self-defrosting type heat pump air-conditioner and automatic defrosting process thereof | |
| CN203286825U (en) | Defrosting device of air source heat pump | |
| CN108759157B (en) | One-time throttling two-stage compression heat pump system | |
| CN105276874A (en) | Heat pump air-conditioning unit achieving thermal defrosting through supercooling of stored liquid | |
| CN100516676C (en) | Accumulative type engine driving type air-conditioning apparatus and control method thereof | |
| CN218120236U (en) | Refrigerating system | |
| CN214199280U (en) | Air source heat pump unit with heat pipe defrosting function | |
| CN108759156B (en) | Secondary throttling middle incomplete cooling two-stage compression heat pump system | |
| CN209116576U (en) | It is a kind of can continuous heat supply defrosting net for air-source heat pump units | |
| CN203396147U (en) | Air source heat pump set |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Effective date of abandoning: 20081112 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |