MeiXing equipment technology in Dongguan, China Contact: Mr. Lin 13725823281 Tel:0769-(87051556) Fax:0769-(89026077) Address: ShaTou industrial zone on the 26th Web: www.fengqic.com Foshan City Address: Foshan ChanCheng Datang Industrial ZoneNo. 88 Tel:0757-(86138493) Fax:0757-(89493169)
Installation
Design and installation guide
(A), air-conditioning equipment selection America evaporative air conditioners have several series of products. Portable air cooler series plastic shell design beautiful, each parameter is smaller, suitable for home and small places; mobile desktop cooling fan series plastic shell, beautiful appearance, compact structure, large air volume for a wide range of cost-effective ; U.S. environmental air conditioning series centrifugal fan, the air flow, pressure head is higher than the axial flow series, air farther, suitable for large spaces and commercial establishments. Specific air-conditioner equipment selection should take into account the size of the use of premises, staff density, heat, and installation location of a combination of factors to select the appropriate series and model. (B), the use of the psychrometric chart to determine the supply air temperature According to local weather conditions on the psychrometric chart to determine the outdoor state point W from the W point along the enthalpy line at 85% (saturation efficiency of the air-conditioner), relative humidity line intersect at point O, O point corresponds to the temperature shall be sent wind, temperature t0. O points can also find out the outlet air humidity ratio (g / kg, dry), which can be used for the humidification amount of the calculation of evaporative air-conditioners.
(C), air-conditioning equipment, the number of choice A. General ventilation (1) according to theoretical calculations Conventional air conditioning load calculation formula to calculate the use of the room cooling load and the moisture load and air supply, and then calculate the air-conditioners can provide cooling capacity, in order to select the station number and type of air-conditioners, select the total cooling capacity of air-conditioners must greater than room cooling capacity requirements, margin generally considered 10%. Theoretical calculations of the full cooling capacity of evaporative air-conditioners: Full cooling capacity S = LρCp {e • (tg-ts) + tn-tg} / 3600 Of which: L ------ air conditioners, air volume (m3 / h) ρ ------ outlet air density (kg/m3) Cp ------ air specific heat (kJ / kg • K) saturation efficiency of e ------ air conditioners, and generally 85% (Tg-ts) ------ dry and wet bulb temperature difference (℃) (Tn-tg) ------ indoor and outdoor temperature (℃) Set △ t1 = (tg-ts), △ t2 = (tn-tg), which △ t1 is positive, △ t2 with positive or negative. Full cooling capacity S = LρCp (e △ t1 + △ t2), in which ρ is, Cp, e is the constant, can be seen from the size of the full cooling capacity of the air-conditioner and air-conditioners, the actual amount of wind, wet and dry bulb temperature difference between indoor and outdoor temperature. Since △ t1, and △ t2 is uncertain amount, as the ambient temperature changes, so cold formula is generally used only for qualitative analysis, and less on the quantitative calculation. According to the characteristics of evaporative air-conditioners "type" we often experience in computing the number of equipment units. Experience of computing (2) Air changes per the parameters to determine the number of units required within a certain space of air conditioners, evaporative air-conditioners commonly used design methods. The actual engineering design in general have adopted this approach. ① number of air changes the definition: the number of ventilators N (cycles / hour) = refrigeration space, the total air volume is L / (indoor area S x outlet exhaust port height H); ② general environmental requirements the number of ventilators / 25 to 30 hours; ③ flow of people-intensive public places, ventilation frequency of 30 to 40 times / hour; ④ heating equipment production plant requires a number of air changes / hour or more 40 to 50; ⑤ appropriate increase in the number of ventilators in the more humid southern region, rather than the hot, dry northern areas may be appropriate to reduce the number of ventilators. Specific calculation steps: ① calculations required cooling area S, the big H to determine the transmission or the height of the air vents, and then calculate the refrigeration space volume V; ② According to the actual situation to determine the number of ventilators N; (3) refrigeration space volume V x the number of ventilators N to obtain the space required for the total air volume L; The ④ total air volume divided by the menu Taiwan by air-conditioners in the actual air volume L1, ie, number of units n required for air-conditioners. Two. Post blast Described above is a full blast of the general design and calculation methods, but in many cases, some commercial and industrial buildings in some regions within the temperature is high, such as machine fever, processing fever often this case the temperature of the indoor than outdoor higher evaporative air-conditioners can be outdoor air-cooled and continuously served indoor. For example, a factory floor, high calorific value of their equipment, the indoor temperature can reach 45 ° C, while only 38 ° C outdoor temperature. Evaporative air-conditioners into the indoor and outdoor air of 38 ° C cooling to 30 ℃, 15 ℃ lower than the original indoor 45 ° C, significantly improve the working environment. This case we generally do not conduct the heat load calculation, simply design a post air supply system, the outlet is constantly cold air sent to the post positions around the hot air was dispersed. In addition, positions the air supply system can also be used in a completely open space, these establishments take into account positions cooling is a more appropriate choice. Post blast air volume to determine the actual situation: According to the post, first determine the amount of each position of the wind, the required air volume for each position multiplied by the number of positions can be calculated to the total air volume required, and thus can be calculated should be Number of units of the optional air-conditioners. Each outlet of the air flow according to the actual general outlet of the air volume control as much as possible in between 3 ~ 6m / s (according to the heat of the place of installation of equipment and personnel density). 3. The determination of the exhaust volume Evaporative air conditioners of the type "is replaced by continuous injection of fresh cold air to the indoor indoor stale air to achieve cooling purposes, the basic form of the US-type air-conditioning cooling system is" a ", rather than closed. Under normal circumstances, the interior pressure of natural ventilation, mechanical ventilation can be used in a confined space. In order to achieve good ventilation cooling effect, "type" air-conditioning cooling system exhaust volume to achieve more than 80% of the total air volume, the natural speed of the exhaust air should be controlled at less than 2m / s, to ensure that the system - satisfaction operation. (D), the design of the ventilation ducts A. Basic terminology (1) The amount of wind Through the air volume of the circular duct cross section calculated as follows: L = 900лd2v (m3 / h) Where d ------ duct inner diameter (m) v ------ wind speed (m / s) Through the rectangular duct, the duct calculation methods: L = 3600abv (m3 / h) Where a, b, ------ duct section clear width and clear height (m) (2) duct system resistance The duct system resistance along the friction and local resistance in two parts, using the formula expressed as: △ P = △ Pm + △ Pj Where △ P ----- overall system resistance (Pa) △ of Pm ----- systems along the frictional resistance (Pa) The △ Pj ----- systems of local resistance (Pa) (3) along the frictional resistance. △ Pm = △ pm • L Where △ pm ----- along the resistance per unit length (Pa / m) L ----- pipe length (m) (4) loss of local resistance In △ Pj = ξ • v2ρ / 2 Formula of ξ ------ coefficient of local resistance v ------ duct pressure loss occurred at the air velocity (m / s) of ρ ------ air density (kg/m3) Two. "Type" air-conditioner piping system design features (1) air supply pipe materials commonly used galvanized sheet, also can be glass fiber reinforced plastic duct. (2) The outlet is set to the actual cooling vent design air volume that is its occasion required air flow to cool the outlet specifications to determine the speed of air flow and outlet, outlet material can be aluminum alloy products or plastic and other products, outlet type can take many forms according to the actual situation, but it is recommended to choose the DC-type single or double Louver, the outlet the throat average flow rate control in the 3 ~ 6m / s recommended 4 ~ 5m / s, flow rate; recommend the installation of the outlet vent control valve to adjust the air volume. (3) air hose specifications generally assumed that the velocity design wind speed of the main duct is maintained at 6 ~ 9m / s, the branch duct 4 ~ 6m / s wind speed within the system end of the tube should be maintained at 3 ~ 5m / s. (4) requirements for the design of the duct system in principle not only economic but also to achieve the lowest drag and noise, "type" air conditioners air as far as possible the maximum. Duct bend radius of curvature is generally less than 1.5 times the pipe flange wide, in order to reduce the resistance of the system. (5) according to the characteristics of the "type" air conditioners wind pressure, the air supply system piping should not be designed too long, the layout can not place duct without duct, you must use the duct, as far as possible lookout tube design to a shorter route. (6) design of the pipeline should try to walk a straight line, to avoid unnecessary turning and branch, to reduce the loss of local resistance of the system piping. Outdoor air supply tube (7) must be prepared to waterproof waterproofing measures, the side wall unit installed outdoor air supply pipe must be set out slope, roof-mounted unit of the outdoor air supply pipe must be prepared to waterproofing measures. (8) a longer pipeline according to the different design of the air flow into the different specifications of the duct, using adjustable pipe connection, adjustable tube set should not be too general the whole system should not be more than four, adjustable tube length ≥ 2 (Dd) to determine. The air supply pipe and air-conditioners in the application of the junction (9) Soft took over the outdoor air supply pipe is the best design of the insulation, the interior is generally no need insulation. (10) if support duct design will need to be installed in the branch pipe valves or guide air damper to regulate air flow, manifold air flow to meet the design requirements. (E), air Airflow forms of organization, refers to the flow of air in the room of the line into the stream type. Airflow in the form of a variety of requirements should be based on the use of space, combined with the characteristics of the building structure and process equipment layout, and other conditions of a reasonable choice. In accordance with the mutual relations of the delivery, exhaust outlet location and direction of air flow, the common air distribution: side to send the side of the row, side to send ranked on the send side of the row and sent the form of a row of four kinds, the actual project may be several airflow pattern combined. A. Cesongcepai Side to send the send side of the row, the air vents are arranged in the side of the room, according to the span of the room can be arranged into a unilateral delivery unilateral row and bilateral send bilateral row. In this way is suitable for air-conditioners installed in the side wall, side walls with windows for natural ventilation or side wall installation of mechanical ventilation. (Figure 1) Two. Side to send ranked Side of the send side of the row of the way outlet in the room, the air vents in the room the upper. In this way is suitable for installation in side wall air conditioners, roof skylights for natural ventilation or roof to install mechanical ventilation. (Figure 2) 3. On the sending side of the row Way on the send side of the row outlet is located in the upper part of the room, the exhaust port is placed on the room side. In this way is suitable for air-conditioners installed on the roof, side walls with windows for natural ventilation or side wall installation of mechanical ventilation. (Figure 3) 4. On to send ranked On the send side of the row of the way outlet at the top of the room, the air vents in the room at the top. In this way is suitable for air-conditioners installed on the roof, the roof skylights for natural ventilation or roof-mounted mechanical ventilation. (Figure 4) (F), water, electricity (1) clean water (generally available municipal tap water) and to ensure that the water pressure ≥ 1.0kgf/cm2. (2) cut-off valve should be located near the inlet of the air-conditioner (DN15), and set aside for cleaning the pipe joints. (3) In order to prevent the split up of the winter, water pipes, air conditioners, outdoor water pipes shall be provided with insulation and drain valve (determined according to the local water supply and drainage design specifications), the winter does not use air-conditioning cooling function to be ranked the net unit within the tank storage. (4) ensure that the supply voltage stability in the single-phase 220 ~ 240V, three-phase 380 ~ 400V, current to the rated current of the machine nameplate. (5) on the main circuit air switch should be installed to avoid failures caused by short circuit, overload. (7), noise control America evaporative air-conditioner noise in general is relatively small, the actual design process should be considered to choose the air-conditioner series, the design of air distribution system to pay attention to the different places of the use of noise, the wind speed inside the duct can not be too large duct materials used to meet the requirements. Such as galvanized iron sheet wind pipe thickness according to the requirements is too thin can cause jitter noise generated; the use of mechanical ventilation, the exhaust pipe of the suction velocity is not too much; air-conditioners and duct connections should be soft to take over; wind pipe fabrication and installation shall comply with the specifications, special requirements should be considered such as anti-vibration measures.
China's Dongguan City MeiXing equipment technology All rights reserved. Contact: Mr. Lin 13725823281 Tel: +86-769-(87051556) Fax: +86-769-(89026077) Website: www.fengqic.com Address: China's Dongguan City ShaTou industrial zone on the 26th Foshan City Address: Foshan ChanCheng, DatangIndustrial ZoneNo. 88 Tel:+86-757- (86138493) Fax:+86-757- (89493169)
