College】 【weak common knowledge of HVAC design and problems of aggregate --- Power By 【China】 weak home network..

<br> (a) of the system design <BR> <BR> 1, location of pumps in the system design: <BR> general, the chilled water pump chiller should be located in the front, back from the .end of the chilled water through the chilled water pumps to fight. back to the chiller; cooling water pump cooling water into the unit in the water on the road, out from the cooling tower pump cooling water through cooling units to fight back; hot water .circulating pump located in the return water pipe from the hot water back through the hot end. circulating pump to fight back plate heat exchanger.. <BR> <BR> 2, the valve on the cooling tower design: <BR> .2,1 plus cooling tower water inlet solenoid valve (not promoting the use of manual valves) <BR> 2,2 tube drain valve should be set. in the room, (if placed in the outdoors, thanks to some water in the .winter, easy to freeze) <BR> <BR> 3, electronic water meter is installed <BR> placed on the pump behind the hosts in front.. <BR> <BR> 4, before and after the .filter before and after the release valve <BR> filter pressure gauge.. <BR> <BR> 5, before and after the pump inlet valve in turn pump <BR> 5,1 then: butterfly valve - pressure gauge .- Soft pump outlet pipe connected <BR> 5,2 in turn connected: Soft received -. pressure gauge - check valve - valve <BR> <BR> 6, sub-catchment <BR> 6,1 in between .the sub-manifold pressure bypass valve and bypass electric tube (diameter generally the DN50) <. BR> 6,2 catchment of the return pipe should be located on the thermometer. <BR> <BR> 7, the location of .various instruments: arrangement of thermometers, pressure gauges and other measuring instruments shall be in place to facilitate observation of the valve. door height of common ground 1.2-1.5m, above this height, the working platform should be set.. <BR> .<BR> 8, the location of units: two prominent part of the compressor is less than the distance between the 1.0m, the distance between the refrigerator and the wall and non-main channel distance not less than 0.8m, medium and large .refrigeration. unit (centrifugal, screw, absorption chillers), the distance is 1.5-2.0m.. Refrigeration chiller room reserved for the upper part of the best parts of the hook lifting or setting the biggest electric lifting equipment.. <BR> .<BR> (B), water point design point for a summary <BR> <BR> issues: water gradient to be reasonable <BR> 1, the horizontal branch, trunk, along the flow direction should be maintained not .less than .0.002 slope; <BR> 2, the drain water tray unit slope branch should not be less than 0.01.. <BR> 3, because of conditions, it can be laid without slope, but the pipe flow velocity shall .not be less than 0.25m / s.. <BR> <BR> Question Points II: the design of condensate trunk <BR> 1, should be close to discharge condensate, generally ranked in the bathroom floor drain <BR> .; 2, condensate water mains to consider the length of the design caused by the high gradient., tube ends can not be greater than the distance gap between high and low ceiling height <BR> <BR> three trouble spots: Select the .appropriate pipe valves <BR> 1, riser pipe connection and level control valve installed <BR> 3, water. set the highest point of each pipe exhaust (no slope when laying, the end of the horizontal pipe flow) <BR> .; 3, the lowest riser connection shutoff valves for easy maintenance riser <BR> 4, water. thermal compensation can bend the natural compensation, lack of expansion may also be an additional point of compensation <BR> <BR> four issues .: water pipe layout <BR> 1, the riser should not be misplaced in the pipeline well advised to rely on the wall. Kok placed <BR> 2, pipe ban in the horizontal plane through the stairs, wall, power distribution room .<BR> <BR> issues point five: insulation pipe insulation <BR> 1 generally by the insulation layer and the protection layer. <BR> 2 insulation thickness to be determined based on thermodynamic calculation, experience, values refer to ."civil air-conditioning design" P279 <BR> 3 insulation materials can be adapted to local conditions, the nearest drawn, should be non-combustible or flame retardant materials must meet the "architectural design. for fire protection." .. <BR> <BR> Problem point six: <BR> 1 hydraulic calculation of air conditioning water system pressure loss of the parallel circuit the difference should not exceed 15%; <BR> 2 water pipeline should be controlled than .the friction in the 100-300Pa. / m, <BR> <BR> point seven issues: water systems supply water <BR> 1 water systems supply water to be softened by processing, the system can be used only in summer .cooling electronic water treatment device; <BR> 2 system. fill water system water capacity to take 2% <BR> 3 pay point should be located in the circulating pump suction section <BR> <BR> (c), .the end of the design should pay attention to trouble spots: <BR> <BR> 1 .. Jiefeng tube design of the wind outlet plate <BR> 1) the first outlet and the outlet of the wind from the disk to .be appropriate; <BR> 2) with two air outlet of the air tube to be adjustable plate;. <BR> 3) wind disk with return air from the outlet to be appropriate.. (≤ 5 米) <BR> .; <BR> 2.. Road access to water fan coil design <BR> 1) out of water pipeline to "make progress under a"; <BR> 2) air supply and return water pipe flanges and the relative .elevation of not less than 200mm; <BR> 3). in turn took on the inlet filter, valve, and soft access; <BR> 4) then the outlet pipe connection software, valve.. <BR> < .BR> 3.. The same model number of the wind outlet plate <BR> the same model to determine the wind outlet plate number of the different regions of visual air-conditioning set, <BR> <BR> 4.. .Packet between the two share a disk wind <BR> airflow between the two packets share a disk wind, one for each package can be installed between the outlet, the inlet, between the two packages can be received through the series back to the wind .outlet plate. on, <BR> <BR> 5.. Wind near the disk layout of the window: <BR> to resist the infiltration of outdoor cooling load, fan coil should be as close to the wall, outside the .window layout.. <BR> <BR> 6.. The arrangement of the large space of fan coil units: <BR> coil arrangement in the large space, it is desirable to "wind back the middle, both sides .of the air, "the arrangement of air flow organization plate, <BR> <BR> 7.. Embedded machine layout layout <BR> embedded machine when the distance from the wall not more than 3 meters; <BR> .; such as meeting rooms, function rooms and other arrangements should be for a small embedded machine cooling capacity of multiple machines, uniform layout.. <BR> <BR> 8.. Selection <BR> large space inside the machine can .choose an embedded machine, rectangular office the best selection of cassette <BR> <BR> 9.. Air space should not be optional selection <BR> high air diffuser (air should not be served on the work area), the .best use of adjustable double shutter outlet. <BR> <BR> 10.. Return air box approach: <BR> air handler return air design: to compare the return air at the large return air box, in the return air .box side of the open return air, the way adjustable airflow to reduce noise), <BR> <. BR> 11. According to the function room and the cold wind load design appropriate disk.. <BR> Disk selection to .the design wind load based on wind disk layout should consider the characteristics of air-conditioned room layout and beautiful as possible.. <BR> <BR> (D), the wind system design note points: <BR> < .BR> 1.. Delivery, exhaust port to the appropriate distance.. <BR> Air vents and outlet for at least 3 m from the air to prevent short circuits <BR> <BR> 2.. Appropriate choice of valve ... <BR> In principle, the system error of pressure balance within 10% -15%, can no valve, but in fact only * Adjustable tube size to adjust air pressure is very difficult, therefore, to be set. air volume .control valve.. <BR> ① should be located at the branch duct air volume control valve.. Three branches in three-way valves can be set at, or branch office is located in the valve.. <BR> ② clearly .not set the loop can not adjust the valve to reduce pressure loss.. <BR> ③ available at the required fire damper valve replacement valves <BR> ④ louvers at the air outlet is appropriate outlet with a valve, double blinds outlet can .be less demanding, with air conditioning point of view. adjust the air flow.. <BR> ⑤ fresh air inlet should be installed to close the switch valve, air valve insulation should be installed in cold regions, automatic control, electric air valve .should be used.. <BR> <BR> 3.. Duct layout.. <BR> ① to minimize local resistance, a reduction of elbow, tee, adjustable number of <BR> ② Do not bend the center .of the radius of curvature less than the diameter or side length of the duct, generally 1.25 times the diameter or side available. Long <BR> ③ duct system to facilitate the regulation of branch points in the trunk before and after the pressure taps should .be set aside.. Pressure pitch in front of the local tube should be greater than the distance 5b (b is the long side of rectangular duct or round duct diameter), from the back of the distance from the local tube should be not less than .2b.. Fan exit air pipe on a more stable pressure taps should be set aside.. <BR> <BR> 4.. Location <BR> ① imports of fresh air inlet should be located in the outdoor air is a .clean place, to ensure air quality <BR> ② preferably be located at the north wall, to avoid in the roof and west wall, and the shade should be located in the building. This can make the summer at the outdoor air temperature is .low inhaled some of <BR> ③ from the outdoor air inlet at the bottom of the ground not less than two meters, when the air inlet arranged in the Green Belt, then not less than one meter should be arranged <BR> ④ .. windward side of the exhaust port, and below the air vents, and keep the spacing of not less than 10 meters <BR> 5.. The requirements of the new outlet should be fixed shutters <BR> ① <BR> .② wet areas should be adopted to prevent the rain water into the <BR> ③ blinds to prevent birds, blind should be established within the metal <BR> <BR> 6.. Exhaust pipe new approach <BR> exhaust .system similar to hotel rooms designed to the following considerations: the use of the indoor air exhaust fan will be routed to the corridor ceiling, exhaust pipe exhaust set up in the corridor for the effective use of waste heat, exhaust. fan can be set in .the bathroom. <BR> <BR> 7. <BR> outlet and wall outlet from the wall distance of not less than 1 meter <BR> <BR> 8. outlet of choice. <BR> ① .new outlet., air outlet louver with a double <BR> ② return air grille air <BR> ③ with air vents with double blinds <BR> ④ fluoride system due to the general air flow is relatively small, such as requiring .winter heating needs, should adopt the double. layer of louvers, diffusers can not.. <BR> ⑤ When fan coil with two outlet valve should be selected with a double-shutter <BR> <BR> 9. < .BR> Outlet air dew condensation is due to the small outlet, the temperature is low.. Outlet size can be increased to prevent condensation <BR> <BR> 10.. Plenum plenum chamber calculated <BR> ① control speed should .not exceed 1.5m / s <BR> ② the wind cross-sectional area A = G / V (G for the air supply), the direction of cross-sectional area should be the same <BR .> ③ general system .can be used instead of outlet muffler plus adjustable plenum <BR> <BR> 11.. Determination of the number of smoke ventilation.. <BR> ① fire pump room is not less than 4 times <BR> ② transformer .room 5-8 times <BR> ③ transformer room 5-8 times <BR> <BR> 12.. Exhaust port layout.. <BR> ④ corridors more than 60 meters, making the elevator before the exhaust port .<BR> ⑤ room with leafy normally open outlet, located on each floor stairwell of a <BR> ⑥ vertical blinds with the outlet from the 2-3-layer design. A <BR> <BR> 13.. .The room air pressure condition.. <BR> ① air-conditioned rooms within the building should maintain positive pressure.. <BR> ② the building of toilets, wash rooms, equipment rooms should be maintained in a variety of negative pressure negative .pressure <BR> ③ positive pressure should be maintained within the hotel room, toilet negative pressure should be maintained between the lobby of the restaurant should be <BR> ④. to maintain positive pressure, negative pressure should be maintained in the kitchen. .. The air pressure inside the restaurant and kitchen should be in the lobby between.. <BR> <BR> 14.. Ceiling principles within the duct layout <BR> from top to bottom as follows: exhaust duct, exhaust pipes ., air pipes, water pipes <BR> <BR> 15.. Delivery, the relative position of air vents <BR> parallel supply and exhaust tube air-conditioned room, the supply and exhaust port so as not to tie arrangement ., preferably staggered <BR> <BR> 16.. <BR> Air as far as possible, the design wind does not fall in the air supply tube to go, to ensure good air flow tube and the wind effects < .BR> <BR> 17.. Lap tee and the wind pipe diameter <BR> and links connecting the three links of the caliber to be consistent in not adjustable, to avoid excessive local damage. <BR>..