CN101900367A - Low-carbon leadless clean pipeline system capable of easily passing through heating, ventilating and air-conditioning system - Google Patents
Low-carbon leadless clean pipeline system capable of easily passing through heating, ventilating and air-conditioning system Download PDFInfo
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- CN101900367A CN101900367A CN 201010213956 CN201010213956A CN101900367A CN 101900367 A CN101900367 A CN 101900367A CN 201010213956 CN201010213956 CN 201010213956 CN 201010213956 A CN201010213956 A CN 201010213956A CN 101900367 A CN101900367 A CN 101900367A
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Abstract
The invention discloses a low-carbon leadless clean pipeline system capable of easily passing through a heating, ventilating and air-conditioning system. The low-carbon leadless clean pipeline system comprises a water mixer, a boiler, a water divider and collector, a floor heating pipe, pipelines, valves and a water tap, wherein the top of the water mixer is provided with an exhaust valve and the bottom of the water mixer is provided with a water discharge port; leadless valves for connecting each pipeline are connected with the water mixer through joints; the boiler is connected with a module system control centre; the module system control centre is connected with an indoor sensor and an outdoor sensor respectively; a water outlet pipe of the boiler is connected with a water inlet pipe of the water mixer; a water inlet pipe of the boiler is connected with a water outlet pipe of the water mixer; the water outlet pipe of the boiler is connected with a leadless check valve; the water mixer is also connected with a solar heat exchange water tank; and a heat conducting pipe which is connected with a solar heat collection plate is arranged in the solar heat exchange water tank. The system is made of PB tube and has superior characteristics. By using two matched heat sources, the system has the advantages of rational design of integral structure, stable running, energy conservation, environmental protection and capability of meeting the personalized low-carbon requirement at the right time.
Description
Technical field
The present invention relates to a kind of floor heating pipe-line system.
Background technology
The water floor heating is to be heating agent with the low-temperature water heating, by being embedded in underfloor water back the floor heated, and as radiating surface,, be a kind of heating system that the room micro climate is regulated with whole ground uniformly to indoor radiations heat energy.
When many families of central heating change floor heating, as still adopting central heating as thermal source, though first less investment, but be subjected to the restriction of central heating, need take other measures in addition before or after heating season, and be difficult to the branch family and carry out adjustment, inconvenient maintenance, energy resource consumption is bigger, expense height, comparatively inconvenience of long-term use.
Existing employing water floor heating pipe-line system normally adopts boiler, combustion gas etc. as single supplying heat source, and the operation of boiler needs coal, electricity etc. as the energy, and energy consumption is big, and the operating cost height does not meet the theory of low-carbon environment-friendly.Existing boiler water floor heating can only be regulated the temperature of floor heating by manually the operation of boiler being controlled, and makes troubles to the user, and also the use occasion to floor heating produces bigger limitation.
It is several that existing floor heating pipe-line system mainly contains PPR pipe, PEX pipe, PERT pipe, and there is following defective in actual applications in above-mentioned pipe-line system:
The PPR pipe: price is low, and resistance to elevated temperatures is good, can weld.But tube wall is thicker, crooked difficulty when floor heating is constructed, and screen resilience is bigger, and thermal conductivity is relatively poor.
The PEX pipe: comprise PEXa and PEXb two classes, low-temperature flexibility is good, and is more high temperature resistant than PPR, and anti-stress cracking is good, and is crosslinked but raw material have taken place, and can not recycle, and can not use hot melt to connect.Pipeline generally uses copper pipe fitting to connect, and long-term the use easily leaked.
PERT pipe: kept the advantage of PEX pipe, but do not taken place crosslinkedly, tubing still can connect by hot melt, and joint is reliable, is difficult for seepage takes place, and pliability and resistance to low temperature are also better.But poor in flexibility is easy to cause the pipe wound in the middle of transportation, the construction, causes potential safety hazard in floor heating is used.
In addition, also there is the water quality pollution problems in existing floor heating pipe-line system, and parts such as existing floor heating pipeline system water tap, valve exist installs inconvenient problem, is difficult to maintenance after the damage.
Summary of the invention
The invention provides a kind of low-carbon leadless clean pipeline system capable of easily passing through heating, ventilating and air-conditioning system, solve that existing pipe-line system thermal source is single, energy consumption big, can't regulate at the branch family, and system maintenance, pipe fitting are installed inconvenient technical problem.
The technical solution adopted for the present invention to solve the technical problems is:
This low-carbon leadless clean pipeline system capable of easily passing through heating, ventilating and air-conditioning system, comprise water-water jet, boiler, water collecting and diversifying device, floor heating heating tube, and pipeline, valve and tap, air bleeding valve is arranged at described water-water jet top, discharge outlet is arranged at the bottom, and the unleaded valve that connects each bar pipeline is connected with water-water jet by joint, and water-water jet one side connects water inlet pipe and outlet pipe, water-water jet water inlet pipe one end is connected with unleaded water meter, filter, ball valve, direct insertion joint successively, also is connected with expansion drum on the water-water jet water inlet pipe;
Described boiler is connected with modular system control centre, modular system control centre is connected with interior sensor and outdoor sensor respectively, boiler discharging tube is connected with the water-water jet water inlet pipe, and boiler water inlet pipe is connected with the water-water jet outlet pipe, is connected with unleaded check-valves on the boiler discharging tube;
Described water collecting and diversifying device is connected with water-water jet, and the floor heating heating tube adopts the PB pipe, and the PB pipe is connected with delivery port on the water collecting and diversifying device person in charge;
Described tap is connected on the interior conduit, the water intake end of interior conduit is connected with the tenth unleaded valve on the water-water jet, the water side of interior conduit is connected with the 9th unleaded valve, be connected with air bleeding valve on the interior conduit before the tap, be connected with filter, air bleeding valve and unleaded check-valves in turn on the interior conduit after the tap.
Described water-water jet also is connected with spats copper coin radiator, the water intake end of spats copper coin radiator is connected with the first unleaded valve on the water-water jet through temperature-sensing valve, circulating pump, and the water side of spats copper coin radiator is connected with the second unleaded valve on the water-water jet through filter again.
Described water-water jet also is connected with the solar heat-exchange water tank, there is the heat pipe that is connected with solar heat-collection plate solar heat-exchange water tank inside, the water intake end of solar heat-exchange water tank is connected with the 4th unleaded valve on the water-water jet through circulating pump, the water side of solar heat-exchange water tank is connected with the 3rd unleaded valve on the water-water jet, and circulating pump is connected with modular system control centre.
Also be connected with intelligent water mixer between described water collecting and diversifying device and the water-water jet, intelligent water mixer is made of circulating pump and cross valve, the water intake end of water collecting and diversifying device is connected with the water side of circulating pump through ball valve, the water intake end of circulating pump is connected with first interface of cross valve, the 3rd interface of cross valve is connected with the 5th unleaded valve on the water-water jet, be connected with unleaded check-valves between the 3rd interface and the 5th unleaded valve, the water side of water collecting and diversifying device is connected with second interface of cross valve through ball valve, and the 4th interface of cross valve is connected with the 6th unleaded valve on the water-water jet.
Be connected with between described water collecting and diversifying device and the water-water jet all to press and mix water vat.
Described air bleeding valve, filter, ball valve all are connected with pipeline through direct insertion joint.
Beneficial effect of the present invention is as follows:
1, system adopts solar energy heating system to cooperate with boiler thermal source is provided, and solar thermal collector can obtain solar radiant energy and the heat that transforms, delivers to the indoor heating of carrying out by cooling system, in superfluous heat is stored in the heat storage water tank.The heat of collecting when solar thermal collector is replenished by the heat that stores during less than heat load.If during the shortage of heat that stores, provide by standby auxiliary thermal source.With the main distinction of conventional energy resource heating system be it be with solar energy as the energy, substitute or part substitutes with the boiler as the energy such as coal, oil, natural gas, electric power.When climate change or overcast and rainy etc. does not have sunshine, can adopt boiler as thermal source.Two kinds of thermals source are used, and can save the energy, low-carbon environment-friendly.
2, the heating agent in the system (high-temperature water) is realized power conversion by boiler, and boiler is connected with modular system control centre.Simultaneously the pumping installations of solar energy also is connected with modular system control centre, realize Based Intelligent Control that two kinds of thermals source are moved making native system by interior sensor, outdoor sensor again applicable to the occasion that does not need the user to regulate, and such as in the hotel, school.
2, save thermal source, use extensive, easy to maintenance.Water-water jet is connected with many group boilers, and is provided with many group valves on water-water jet, adopts independent pipeline to be connected into each family.Not only can realize central heating, can realize that also branch family individual heating and family expenses supply water.System architecture is reasonable, and maintenance overhaul is convenient, and easy to assemble, reusable (solar energy, earth source heat pump, public waterworks full trim room etc.) can realize the shared installation of water power.
3, reasonable in design, stable, The book of Changes HVAC system can suit measures to differing conditions in terms of time, satisfying personalized low-carbon (LC) demand.Particularly under the situation of seldom living for second shelter, only need the water knockout drum improvement be need not the operation of maintenance system, solved the problem of water floor heating pipeline anti-freezing and heat-insulating, transform floor heating for central heating simultaneously, because climate reasons needs the usefulness of heating can lay native system in advance per family, the switching mode of suiting measures to differing conditions in terms of time solves the demand of personalized water system before and after the municipal administration heating.
4, comfort health-care, safety and environmental protection, the harm that native system can not cause the water quality convection current to be produced can reduce water quality and pollute, and has eliminated the peculiar smell of valve arrangement and pipeline laying dust and volatilization.
5, save the space, lighten the load, The book of Changes system adopts the unleaded copper product of prefabricated typing high density, no lead bronze adopts high-tech to produce valve, tap, on the use water supply pipe.Alleviate the current dynamic load, no curing period,, that pipeline is installed is convenient, it is laborsaving to save worry, and can carry out synchronously with wall surfacing, and short construction period, installation quality are fully ensured, can make the water system operation safer stable, easy to maintenance.
6, rapid, economical and energy saving are installed, floor heating thickness only is 12mm, saves the space, quick heating, about 30 minutes of preheating time, thermal efficiency height, save the energy, operating cost is low, average 45 ℃ of (18～20 ℃ of room temperatures of supply water temperature, tube pitch 200mm), upwards dispels the heat 85%, dispel the heat about 15% downwards, more traditional ground warming energy-saving about 20%, energy-conservation more than 50% than traditional heating, save the cement backfill simultaneously more than 60%, adjustment is fast, and locellus temperature control effect is preferable.7, the tap of native system, valve, filter etc. all adopt direct insertion design, and pipeline is embedded in the heat-insulation layer in advance, and volume seat shape is finished by the scene assembling.The direct insertion trend that this system showed, one tube multipurpose, save the space, alleviate load, stable, install convenient.
9, native system uses the PB(refractory polyethylene) tubing, belong to Green Product, recyclable utilization does not more in use contain any formaldehyde.PB manages its density and is within other thermoplasticity such as PE or the PP scope.PB is a kind of macromolecule inert polymer, has very high temperature tolerance, persistence, chemical stability and plasticity, and tasteless, nontoxic, nothing is smelt, one of at present most advanced in the world chemical material.PB has good pliability, high temperature resistant, high pressure resistant, ecological, environmental protective when being used for gas-fired radiation heating.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is a structural representation of the present invention.
Fig. 2 is that the present invention installs the structural representation of all pressing when mixing water vat.
Reference numeral: 1-water-water jet, the 2-boiler, 3-modular system control centre, 4.1-interior sensor, 4.2-outdoor sensor, 5-water-water jet water inlet pipe, 6-water-water jet outlet pipe, the unleaded water meter of 7-, 8a, 8b, the 8c-filter, 9a, 9b, the 9c-ball valve, the 10-joint, the 11-expansion drum, 12a, 12b, the unleaded check-valves of 12c-, 13-spats copper coin radiator, the 14-temperature-sensing valve, 15-floor heating heating tube, 16a, 16b, the 16c-circulating pump, 17-solar heat-exchange water tank, the 18-solar heat-collection plate, the 19-heat pipe, the direct insertion joint of 20-, 21a, 21b, the 21c-air bleeding valve, the 22-discharge outlet, the 23-tap, the 24-kitchen, the 25-toilet, the 26-water collecting and diversifying device, the 27-water collecting and diversifying device is responsible for, the 28-cross valve, the 29-first unleaded valve, the 30-second unleaded valve, 31-the 3rd unleaded valve, 32-the 4th unleaded valve, 33-the 5th unleaded valve, 34-the 6th unleaded valve, 35-the 7th unleaded valve, 36-the 8th unleaded valve, 37-the 9th unleaded valve, 38-the tenth unleaded valve, 39-all presses mixed water vat.
The specific embodiment
Embodiment is referring to shown in Figure 1, this low-carbon leadless clean pipeline system capable of easily passing through heating, ventilating and air-conditioning system, comprise water-water jet 1, boiler 2, water collecting and diversifying device 26, the floor heating heating tube, and pipeline, valve and tap, it is characterized in that: air bleeding valve 21a is arranged at described water-water jet 1 top, discharge outlet 22 is arranged at the bottom, the unleaded valve that connects each bar pipeline is connected with water-water jet 1 by joint 20, water-water jet 1 one sides connect water inlet pipe and outlet pipe, water-water jet water inlet pipe 5 one ends successively with unleaded water meter 7, filter 8a, ball valve 9a, direct insertion joint 10 connects, and also is connected with expansion drum 11 on the water-water jet water inlet pipe 5;
Water collecting and diversifying device 26 is connected with water-water jet 1, and the floor heating heating tube adopts PB pipe 15, and PB pipe 15 is connected with the delivery port that water collecting and diversifying device is responsible on 27; The branch water of water collecting and diversifying device is responsible for the feed pipe that is connected in pipe network system, and its main effect is to come from pipe network system hot water by being embedded in each room that underfloor floor heating pipe is assigned to needs floor heating.Guarantee that at first all ball valve door switch are all in open mode, the water knockout drum pipe begins shunting, heating agent is through ball valve flow direction valve circulating pump, circulating pump is except helping the hot water circuit of pipeline in this link, can also avoid in the water pipe hot water or cold water's frequent variations to the safety hazard of pipeline, can also avoid simultaneously the waste of the energy, reducing systematic running cost uses, flow in the pipe network through circulating pump, through multi-functional filter, the impurity that this link middle filtrator filters in the heating agent enters underground pipe network obstruction pipeline to prevent impurity again.When hot water flows, heat is delivered to the floor in floor heating pipe, again by the floor to indoor radiant heat transfer.The other end of floor heating pipe is responsible for the water collector of water collecting and diversifying device and is linked to each other, and the backwater that temperature reduces after indoor heat radiation is responsible for by catchmenting and is got back to pipe network system, finishes a circulation.
Water-water jet 1 also is connected with solar heat-exchange water tank 17, there is the heat pipe 19 that is connected with solar heat-collection plate 18 solar heat-exchange water tank inside, the water intake end of solar heat-exchange water tank is connected with the 4th unleaded valve 32 on the water-water jet through circulating pump 16 b, and the water side of solar heat-exchange water tank is connected with the 3rd unleaded valve 31 on the water-water jet.Circulating pump 16b is connected with modular system control centre 3.
Water-water jet 1 also is connected with spats copper coin radiator 13, the water intake end of spats copper coin radiator is connected with the first unleaded valve 29 on the water-water jet through temperature-sensing valve 14, circulating pump 16a, and the water side of spats copper coin radiator is connected with the second unleaded valve 30 on the water-water jet through filter 8b again.
If pipeline is long, can between water collecting and diversifying device 26 and water-water jet 1, be connected intelligent water mixer, so just can not influence the comfort level of room temperature, satisfy comfort requirement.Intelligent water mixer is made of circulating pump 16c and cross valve 28, the water intake end of water collecting and diversifying device is connected with the water side of circulating pump 16c through ball valve 9b, the water intake end of circulating pump 16c is connected with first interface of cross valve 28, the 3rd interface of cross valve is connected with the 5th unleaded valve 33 on the water-water jet, be connected with unleaded check-valves 12b between the 3rd interface and the 5th unleaded valve 33, the water side of water collecting and diversifying device 26 is connected with second interface of cross valve through ball valve 9c, and the 4th interface of cross valve is connected with the 6th unleaded valve 34 on the water-water jet.
Referring to shown in Figure 2, if the heating of upper and lower floor, when hot water was carried from bottom to top, water just can not be transported to floor when pressure reached, and can install one in this case and all press mixed water vat 39 between water collecting and diversifying device 26 and water-water jet 1.
Air bleeding valve, filter, ball valve all can be connected with pipeline through direct insertion joint 10.
The PB heating tube that the present invention adopts can be suited measures to local conditions, and adopts two kinds of mounting process, can select wet type to mat formation and can select conduit to mat formation, and satisfies ground, the wall decoration requirement of different living environment requirements.The floor is adopted and is made to measure specially during laying.The plank upper surface has pure aluminum foil directly to contact with decorative cover, heat up rapidly, about 20 minutes, indoorly just can enjoy snugness, adopt the low-temperature water heating temperature to be, to reach about 40 degree and just can move use, and acoustic material can be housed, if there is accidental system to be out of order, can directly opens the floor and detect maintenance.
Claims (6)
1. low-carbon leadless clean pipeline system capable of easily passing through heating, ventilating and air-conditioning system, comprise water-water jet (1), boiler (2), water collecting and diversifying device (26), the floor heating heating tube, and pipeline, valve and tap, it is characterized in that: air bleeding valve (21a) is arranged at described water-water jet (1) top, discharge outlet (22) is arranged at the bottom, the unleaded valve that connects each bar pipeline is connected with water-water jet (1) by joint (20), water-water jet (1) one side connects water inlet pipe and outlet pipe, water-water jet water inlet pipe (5) one ends successively with unleaded water meter (7), filter (8a), ball valve (9a), direct insertion joint (10) connects, and also is connected with expansion drum (11) on the water-water jet water inlet pipe (5);
Described boiler (2) is connected with modular system control centre (3), modular system control centre is connected with interior sensor (4.1) and outdoor sensor (4.2) respectively, boiler discharging tube is connected with water-water jet water inlet pipe (5), boiler water inlet pipe is connected with water-water jet outlet pipe (6), is connected with unleaded check-valves (12a) on the boiler discharging tube;
Described water collecting and diversifying device (26) is connected with water-water jet (1), and the floor heating heating tube adopts PB pipe (15), and PB pipe (15) is connected with the delivery port that water collecting and diversifying device is responsible on (27);
Described tap (23) is connected on the interior conduit, the water intake end of interior conduit is connected with the tenth unleaded valve (38) on the water-water jet, the water side of interior conduit is connected with the 9th unleaded valve (37), be connected with air bleeding valve (21b) on the interior conduit before the tap, be connected with filter (8c), air bleeding valve (21c) and unleaded check-valves (12c) in turn on the interior conduit after the tap.
2. low-carbon leadless clean pipeline system capable of easily passing through heating, ventilating and air-conditioning system according to claim 1, it is characterized in that: described water-water jet (1) also is connected with spats copper coin radiator (13), the water intake end of spats copper coin radiator is connected with the first unleaded valve (29) on the water-water jet through temperature-sensing valve (14), circulating pump (16a), and the water side of spats copper coin radiator is connected with the second unleaded valve (30) on the water-water jet through filter (8b) again.
3. low-carbon leadless clean pipeline system capable of easily passing through heating, ventilating and air-conditioning system according to claim 1, it is characterized in that: described water-water jet (1) also is connected with solar heat-exchange water tank (17), there is the heat pipe (19) that is connected with solar heat-collection plate (18) solar heat-exchange water tank inside, the water intake end of solar heat-exchange water tank is connected with the 4th unleaded valve (32) on the water-water jet through circulating pump (16b), the water side of solar heat-exchange water tank is connected with the 3rd unleaded valve (31) on the water-water jet, and circulating pump (16b) is connected with modular system control centre (3).
4. low-carbon leadless clean pipeline system capable of easily passing through heating, ventilating and air-conditioning system according to claim 1, it is characterized in that: also be connected with intelligent water mixer between described water collecting and diversifying device (26) and the water-water jet (1), intelligent water mixer is made of circulating pump (16c) and cross valve (28), the water intake end of water collecting and diversifying device is connected through the water side of ball valve (9b) with circulating pump (16c), the water intake end of circulating pump (16c) is connected with first interface of cross valve (28), the 3rd interface of cross valve is connected with the 5th unleaded valve (33) on the water-water jet, be connected with unleaded check-valves (12b) between the 3rd interface and the 5th unleaded valve (33), the water side of water collecting and diversifying device (26) is connected with second interface of cross valve through ball valve (9c), and the 4th interface of cross valve is connected with the 6th unleaded valve (34) on the water-water jet.
5. low-carbon leadless clean pipeline system capable of easily passing through heating, ventilating and air-conditioning system according to claim 1 is characterized in that: be connected with between described water collecting and diversifying device (26) and the water-water jet (1) all to press and mix water vat (39).
6. low-carbon leadless clean pipeline system capable of easily passing through heating, ventilating and air-conditioning system according to claim 1 is characterized in that: described air bleeding valve, filter, ball valve all are connected with pipeline through direct insertion joint (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102139561A CN101900367B (en) | 2010-06-30 | 2010-06-30 | Low-carbon leadless clean pipeline system capable of easily passing through heating, ventilating and air-conditioning system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102139561A CN101900367B (en) | 2010-06-30 | 2010-06-30 | Low-carbon leadless clean pipeline system capable of easily passing through heating, ventilating and air-conditioning system |
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| CN101900367A true CN101900367A (en) | 2010-12-01 |
| CN101900367B CN101900367B (en) | 2012-08-22 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103090442A (en) * | 2013-02-18 | 2013-05-08 | 洛阳万山高新技术应用工程有限公司 | Environment-friendly energy-saving heating system |
| CN103673054A (en) * | 2013-11-26 | 2014-03-26 | 金旭 | Solar household heating system |
| CN104359142A (en) * | 2014-11-07 | 2015-02-18 | 长春工程学院 | Heat accumulation type solar, electric and coal firing heat combined heating source system |
| CN104456778A (en) * | 2014-10-24 | 2015-03-25 | 南京优能空调系统有限公司 | Assembled type radiation air conditioner system |
| CN111594902A (en) * | 2020-06-02 | 2020-08-28 | 宁波奥克斯电气股份有限公司 | Anti-freezing method and floor heating system |
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| JP2002122342A (en) * | 2000-10-13 | 2002-04-26 | Osaka Gas Co Ltd | Chilled/hot water cooler/heater |
| CN2533405Y (en) * | 2002-03-13 | 2003-01-29 | 顾世章 | Heat exchange device |
| CN2560883Y (en) * | 2002-06-27 | 2003-07-16 | 北京中投洁天节能环保科技有限公司 | Water-strike buffering device for condensed water tube net |
| CN201748518U (en) * | 2010-06-30 | 2011-02-16 | 盛斌 | Heating ventilation lead-free pipeline system |
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| CN2438962Y (en) * | 2000-06-08 | 2001-07-11 | 黄海龙 | Water heating & warming apparatus |
| JP2002122342A (en) * | 2000-10-13 | 2002-04-26 | Osaka Gas Co Ltd | Chilled/hot water cooler/heater |
| CN2533405Y (en) * | 2002-03-13 | 2003-01-29 | 顾世章 | Heat exchange device |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103090442A (en) * | 2013-02-18 | 2013-05-08 | 洛阳万山高新技术应用工程有限公司 | Environment-friendly energy-saving heating system |
| CN103673054A (en) * | 2013-11-26 | 2014-03-26 | 金旭 | Solar household heating system |
| CN104456778A (en) * | 2014-10-24 | 2015-03-25 | 南京优能空调系统有限公司 | Assembled type radiation air conditioner system |
| CN104359142A (en) * | 2014-11-07 | 2015-02-18 | 长春工程学院 | Heat accumulation type solar, electric and coal firing heat combined heating source system |
| CN104359142B (en) * | 2014-11-07 | 2017-03-01 | 长春工程学院 | Heat-storage solar energy, electric energy and coal heat type heat combined heat heat source system |
| CN111594902A (en) * | 2020-06-02 | 2020-08-28 | 宁波奥克斯电气股份有限公司 | Anti-freezing method and floor heating system |
| CN111594902B (en) * | 2020-06-02 | 2022-03-01 | 宁波奥克斯电气股份有限公司 | Anti-freezing method and floor heating system |
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