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Cross ventilation

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20: 235:: This method depends on the pressure contrasts between different openings within the occupied space. For rooms that only feature a single opening, the ventilation is impelled by turbulence, thereby creating a pumping activity on that lone opening, causing small inflows and outflows. It is worth noting that single-sided ventilation has a weak effect. It is preferable when cross ventilation is not achievable, where it uses windows or vents at the other side of the space to control air pressure. 213: 467: 241:: Being unsophisticated and efficacious, this type of ventilation is a horizontal process that is driven by pressure differences between the windward and leeward sides of the occupied indoor environment. Ventilation here is generally provided using windows and vents at either side of a building where the variation in pressure draw air in and out. 144:, the cons include its effects being unproductive on hot, still days, when it is most necessary. Moreover, cross ventilation is generally only suitable for narrow buildings. The contrasting height of the openings (walls, sill, panels or furniture) ordered by the space also immediately influence the level and velocity of ventilation. 851: 120:
on the side facing the wind, and/or low pressure on the adjacent protected side, will make a current of air through the room from the uncovered side towards the sheltered side. If there are windows on both sides in a building, cross ventilation is appropriate where the width of the room is up to five
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Cross ventilation works well in climates with hotter temperatures, where the system allows continual changes of the air within the building, refreshing it and reducing the temperature inside the structure and also when the window on the windward side of the building is not opened as much as the one
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downwind side of the establishment (because of the pressure difference between the openings). A wind's effect on a structure creates regions that have positive pressure on the building's upwind area and a negative pressure on the downwind side. Thus, the building shape and local wind patterns are
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The phenomenon occurs when openings in an environment (including vehicles) or building (houses, factories, sheds, etc) are set on opposite or adjoining walls, which allow air to enter and exit, thus creating a current of air across the interior environment. Windows or vents positioned on opposite
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and is conjugated with another window on the opposite side of a building will supply natural ventilation for fresh air. A decent and effective cross ventilation will remove heat from the interior and keep indoor air temperatures approximately 1.5 °C (2.7°F) below the outdoor air temperatures,
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For rooms with single opening, the calculation of ventilation rate is more complicated than cross ventilation due to the bi-directional flow and strong turbulent effect. The ventilation rate for single-sided ventilation can be accurately predicted by combining different models for mean flow,
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provides the least effectivity. The wind surrounding building structures is important when it comes to assessing the air quality and thermal comfort indoors since both air and heat exchange rely heavily on the wind pressure on the
462:{\displaystyle Q=U_{\textrm {wind}}{\sqrt {\frac {C_{\textrm {p1}}-C_{\textrm {p2}}}{1/\left(A_{\textrm {1}}^{2}C_{\textrm {1}}^{2}\right)+1/\left(A_{\textrm {2}}^{2}C_{\textrm {2}}^{2}\right)}}}\qquad {}\left(1\right)} 2554: 121:
times the floor-to-ceiling height. If openings are only one side then wind-driven ventilation is more suited for structures where the width is around 2.5 times the floor to ceiling height.
34:, fresh air or a breeze enters upon an opening, such as a window, and flows directly through the space and exits through an opening on the opposite side of the building (where the 498: 556: 527: 672: 643: 614: 585: 846:{\displaystyle {\bar {Q}}={\frac {C_{d}\;l\;{\sqrt {Cp}}\;\int \limits _{z_{0}}^{h}{\sqrt {-{\frac {2\;\Delta \;P(z)}{\rho }}}}\,\mathrm {d} z}{z_{ref}^{1/7}}}\;{\bar {U}}} 914: 251:
structure. The openings allow a way for noise to move between spaces. It can provide a much higher air-exchange rate in comparison with single-sided ventilation.
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on the leeward side. Cross ventilation will not be efficacious if the windows are more than 12m apart and if a window is behind a door that is regularly shut.
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As observed in the equation (1), the air exchange depends linearly on the wind speed in the urban place where the architectural project will be built. CFD (
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difference between the opposite sides of the establishment. The effect is mostly driven by the wind, whereby the air is pulled into the building on the
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sides of the room allow passive breezes a pathway through the structure, which circulate the air and provide passive cooling.
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and directions (which may create a strong unpleasant draft), and the polluted air from the outside that may tarnish the
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For a simple volume with two openings, the cross wind flow rate can be calculated using the following equation:
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and how much wind is available, its potential travel through chimneys, vents and other openings in the home.
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is a local pressure drag coefficient for the building, defined at the location of the downstream opening;
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is a local pressure drag coefficient for the building, defined at the location of the upstream opening;
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pulsating flow and eddy penetration. The mean flow rate for single-sided ventilation is determined by:
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and heat in an indoor environment, cross ventilation can also decrease or even obviate the need for an
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Kosutova, Katarina; Van Hooff, Twan; Vanderwel, Christina; Blocken, Bert; Hensen, Jan (2019).
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can be installed to improve cross-breezes. Air quality may also affect cross ventilation.
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when air is being moved by the cross ventilation from an unclean area into a clean area.
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Cross ventilation relies on many factors, such as the tightness of the establishment,
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Roadmap to improve and ensure good indoor ventilation in the context of COVID-19
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Cross Ventilation, the Chimney Effect and Other Concepts of Natural Ventilation
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can assist wind-driven ventilation by guiding air in and out of structures.
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In a windcatcher, wind is forced down on the windward side and exits on the
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Although cross ventilation is generally more direct at its job than
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Zhou, Junli; Hua, Yong; Xiao, Yuan; Ye, Cheng; Yang, Wei (2021).
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across the room from the exposed area to the sheltered area.
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is lower). This produces a cool stream of air and as well as a
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Cross-breezes work when two windows are opposite of each other.
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If the windows on both sides of the buildings are opened, the
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Disadvantages of wind-driven ventilation include capricious
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can also work as effective ventilation openings, though an
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is the discharge coefficient of the upstream opening; and
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Cross ventilation is a wind-driven effect and requires no
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ENERGY EFFICIENCY MEASURES - HME09 – NATURAL VENTILATION
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is the discharge coefficient of the downstream opening.
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is the cross-sectional area of the downstream opening;
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is the cross-sectional area of the upstream opening;
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There are four different types of cross ventilation:
908: 845: 666: 637: 608: 579: 550: 521: 492: 461: 916:= mean wind velocity at the reference elevation. 2657: 1204: 265:when it rises and the cooler air supplants it. 165:and outflow of fresh air inside the building. 1276: 1121: 867:= elevation of the top edge of the window; 65:. Other terms used for the effect include, 2671:Heating, ventilation, and air conditioning 2043:High efficiency glandless circulating pump 1292:Heating, ventilation, and air conditioning 1283: 1269: 830: 768: 764: 730: 719: 715: 1147: 1026: 789: 113:that force airflow through its openings. 2477:Mold growth, assessment, and remediation 1224: 1088:HACK architecture | Newcastle Architects 245:Cross ventilation (double-banked spaces) 211: 18: 981: 979: 977: 2658: 986:Wind ventilation and cross ventilation 53:. A commonly used technique to remove 2350:Programmable communicating thermostat 1264: 168:Besides windows, other openings like 2472:Mechanical, electrical, and plumbing 974: 1086:The Importance of Cross-ventilation 13: 2333:Minimum efficiency reporting value 1171:World Health Organization (2021). 791: 765: 493:{\displaystyle U_{\textrm {wind}}} 16:Movement of air through a building 14: 2732: 2375:Standard temperature and pressure 2088:Packaged terminal air conditioner 1624:Passive daytime radiative cooling 1353:Heat pump and refrigeration cycle 1201:International Finance Corporation 239:Cross ventilation (single spaces) 1444:Absorption-compression heat pump 1128:Aerosol and Air Quality Research 551:{\displaystyle C_{\textrm {p2}}} 522:{\displaystyle C_{\textrm {p1}}} 161:ensuring that there is a steady 147: 2339:Normal temperature and pressure 1719:Vapor-compression refrigeration 1192: 1164: 667:{\displaystyle C_{\textrm {2}}} 638:{\displaystyle C_{\textrm {1}}} 609:{\displaystyle A_{\textrm {2}}} 580:{\displaystyle A_{\textrm {1}}} 445: 1115: 1110:Natural Ventilation Strategies 1103: 1091: 1079: 1067: 1055: 1043: 1028:10.1016/j.buildenv.2019.03.019 991: 900: 837: 778: 772: 693: 156:An opened window that faces a 104:part and is pushed out on the 30:is a natural phenomenon where 1: 2487:Testing, adjusting, balancing 2431:Building information modeling 2426:Building services engineering 2003:Ground-coupled heat exchanger 1531:Demand controlled ventilation 1479:Building insulation materials 1251:10.1016/j.enbuild.2012.07.028 1076:Designing Buildings Ltd. 2022 1050:Basics of Natural Ventilation 967: 500:is the far-field wind speed; 2048:High-pressure cut-off switch 1599:Ice storage air conditioning 1520:Dedicated outdoor air system 921:Computational Fluid Dynamics 7: 2391:Thermostatic radiator valve 2193:Thermostatic radiator valve 1704:Underfloor air distribution 1639:Radiant heating and cooling 1557:Energy recovery ventilation 1469:Automobile air conditioning 1333:Domestic energy consumption 1180:. World Health Organization 930: 269: 10: 2737: 2540:Institute of Refrigeration 2421:Architectural technologist 1893:Electrostatic precipitator 909:{\displaystyle {\bar {U}}} 176:or ventilation grills and 124: 84: 2602: 2593:Volatile organic compound 2568: 2495: 2452:Environmental engineering 2416:Architectural engineering 2399: 2247: 2218:Ultra-low particulate air 1803:Automatic balancing valve 1750: 1731:Variable refrigerant flow 1583:Heat recovery ventilation 1526:Deep water source cooling 1436: 1298: 2640:Template:Home automation 2462:Kitchen exhaust cleaning 2158:Solar-assisted heat pump 1758:Air conditioner inverter 1537:Displacement ventilation 1428:Vapour pressure of water 1413:Thermal destratification 1007:Building and Environment 233:Single-sided ventilation 207: 187:exterior of the building 2635:World Refrigeration Day 2482:Refrigerant reclamation 2411:Architectural acoustics 2355:Programmable thermostat 2287:Clean air delivery rate 2183:Thermal expansion valve 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1320: 1315: 1310: 1304: 1302: 1296: 1295: 1288: 1287: 1280: 1273: 1265: 1257: 1256: 1225:Wang, Haojie; 1217: 1203: 1191: 1163: 1114: 1102: 1090: 1078: 1066: 1054: 1042: 990: 972: 971: 969: 966: 965: 964: 959: 954: 949: 944: 939: 932: 929: 902: 899: 882: 873: 839: 836: 825: 821: 817: 812: 809: 806: 802: 797: 793: 784: 780: 777: 774: 771: 767: 763: 757: 750: 743: 739: 734: 727: 724: 718: 712: 708: 701: 695: 692: 655: 626: 597: 568: 539: 510: 481: 457: 454: 451: 439: 433: 422: 416: 405: 400: 395: 391: 388: 384: 378: 367: 361: 350: 345: 340: 336: 323: 319: 308: 292: 288: 285: 271: 268: 267: 266: 252: 242: 236: 209: 206: 149: 146: 131:wind direction 126: 123: 111:wind pressures 86: 83: 15: 9: 6: 4: 3: 2: 2733: 2722: 2719: 2717: 2714: 2712: 2709: 2707: 2704: 2702: 2699: 2697: 2694: 2692: 2689: 2687: 2684: 2682: 2679: 2677: 2674: 2672: 2669: 2667: 2664: 2663: 2661: 2646: 2643: 2641: 2638: 2636: 2633: 2631: 2628: 2626: 2623: 2621: 2618: 2616: 2613: 2611: 2608: 2607: 2605: 2601: 2594: 2591: 2588: 2585: 2583: 2580: 2577: 2574: 2573: 2571: 2567: 2561: 2558: 2556: 2553: 2551: 2548: 2546: 2543: 2541: 2538: 2536: 2533: 2531: 2528: 2526: 2523: 2521: 2518: 2516: 2513: 2511: 2508: 2506: 2503: 2502: 2500: 2498:organizations 2494: 2488: 2485: 2483: 2480: 2478: 2475: 2473: 2470: 2468: 2465: 2463: 2460: 2458: 2455: 2453: 2450: 2448: 2445: 2443: 2442:Duct cleaning 2440: 2438: 2435: 2432: 2429: 2427: 2424: 2422: 2419: 2417: 2414: 2412: 2409: 2408: 2406: 2398: 2392: 2389: 2387: 2384: 2382: 2379: 2376: 2373: 2371: 2368: 2366: 2363: 2361: 2358: 2356: 2353: 2351: 2348: 2346: 2343: 2340: 2337: 2334: 2331: 2329: 2326: 2324: 2321: 2319: 2316: 2314: 2311: 2309: 2306: 2304: 2301: 2299: 2296: 2294: 2293:Control valve 2291: 2288: 2285: 2283: 2280: 2278: 2275: 2273: 2270: 2268: 2265: 2263: 2260: 2258: 2255: 2254: 2252: 2246: 2240: 2237: 2235: 2232: 2230: 2227: 2225: 2222: 2219: 2216: 2214: 2213:Turning vanes 2211: 2209: 2206: 2204: 2201: 2199: 2196: 2194: 2191: 2189: 2188:Thermal wheel 2186: 2184: 2181: 2179: 2176: 2174: 2171: 2169: 2166: 2164: 2161: 2159: 2156: 2154: 2153:Solar chimney 2151: 2149: 2146: 2144: 2141: 2139: 2136: 2134: 2131: 2129: 2126: 2124: 2121: 2119: 2116: 2114: 2111: 2109: 2106: 2104: 2101: 2099: 2096: 2094: 2091: 2089: 2086: 2084: 2081: 2079: 2076: 2074: 2071: 2069: 2066: 2064: 2061: 2059: 2056: 2054: 2051: 2049: 2046: 2044: 2041: 2039: 2036: 2034: 2031: 2029: 2026: 2024: 2021: 2019: 2016: 2014: 2011: 2009: 2006: 2004: 2001: 1999: 1996: 1994: 1991: 1989: 1986: 1984: 1981: 1979: 1976: 1974: 1971: 1969: 1966: 1964: 1961: 1959: 1956: 1954: 1951: 1949: 1946: 1944: 1941: 1939: 1936: 1934: 1931: 1929: 1926: 1924: 1923:Fan coil unit 1921: 1919: 1916: 1914: 1911: 1909: 1906: 1904: 1901: 1899: 1896: 1894: 1891: 1889: 1886: 1884: 1881: 1879: 1876: 1874: 1871: 1869: 1868:Cooling tower 1866: 1864: 1861: 1859: 1856: 1854: 1851: 1849: 1846: 1844: 1841: 1839: 1836: 1834: 1831: 1829: 1826: 1824: 1821: 1819: 1816: 1814: 1811: 1809: 1806: 1804: 1801: 1799: 1796: 1794: 1791: 1789: 1786: 1784: 1781: 1779: 1776: 1774: 1771: 1769: 1766: 1764: 1761: 1759: 1756: 1755: 1753: 1749: 1743: 1740: 1738: 1735: 1732: 1729: 1726: 1723: 1720: 1717: 1715: 1714:Vapor barrier 1712: 1710: 1707: 1705: 1702: 1700: 1697: 1695: 1692: 1690: 1689:Solar heating 1687: 1685: 1684:Solar cooling 1682: 1680: 1677: 1675: 1672: 1670: 1667: 1665: 1662: 1660: 1659:Refrigeration 1657: 1655: 1652: 1650: 1647: 1645: 1642: 1640: 1637: 1635: 1632: 1630: 1629:Passive house 1627: 1625: 1622: 1620: 1617: 1615: 1612: 1610: 1607: 1605: 1602: 1600: 1597: 1595: 1592: 1590: 1587: 1584: 1581: 1579: 1576: 1574: 1571: 1569: 1566: 1564: 1561: 1558: 1555: 1553: 1550: 1548: 1545: 1543: 1540: 1538: 1535: 1532: 1529: 1527: 1524: 1521: 1518: 1516: 1513: 1511: 1508: 1505: 1502: 1500: 1499:Chilled water 1497: 1495: 1492: 1490: 1487: 1485: 1482: 1480: 1477: 1475: 1472: 1470: 1467: 1465: 1462: 1460: 1457: 1455: 1452: 1450: 1447: 1445: 1442: 1441: 1439: 1435: 1429: 1426: 1424: 1421: 1419: 1416: 1414: 1411: 1409: 1406: 1404: 1401: 1399: 1398:Sensible heat 1396: 1394: 1391: 1389: 1386: 1384: 1381: 1379: 1378:Noise control 1376: 1374: 1371: 1369: 1366: 1364: 1361: 1359: 1358:Heat transfer 1356: 1354: 1351: 1349: 1346: 1344: 1341: 1339: 1336: 1334: 1331: 1329: 1326: 1324: 1321: 1319: 1316: 1314: 1311: 1309: 1306: 1305: 1303: 1297: 1293: 1286: 1281: 1279: 1274: 1272: 1267: 1266: 1263: 1252: 1248: 1244: 1240: 1236: 1232: 1228: 1227:Chen, Qingyan 1221: 1213: 1207: 1200: 1195: 1176: 1175: 1167: 1159: 1155: 1150: 1145: 1141: 1137: 1134:(5): 200383. 1133: 1129: 1125: 1118: 1112:Window Master 1111: 1106: 1100:2030 PALETTE® 1099: 1094: 1087: 1082: 1075: 1070: 1063: 1058: 1051: 1046: 1038: 1034: 1029: 1024: 1020: 1016: 1012: 1008: 1001: 994: 987: 982: 980: 978: 973: 963: 960: 958: 955: 953: 950: 948: 945: 943: 940: 938: 935: 934: 928: 926: 922: 917: 897: 886: 881: 877: 872: 868: 866: 862: 860: 856: 853: 834: 823: 819: 815: 810: 807: 804: 800: 795: 782: 775: 769: 761: 755: 748: 741: 737: 732: 725: 722: 716: 710: 706: 699: 690: 679: 675: 653: 624: 595: 566: 537: 508: 479: 469: 455: 452: 449: 437: 431: 420: 414: 403: 398: 393: 389: 386: 382: 376: 365: 359: 348: 343: 338: 334: 321: 317: 306: 290: 286: 283: 275: 264: 260: 256: 253: 250: 246: 243: 240: 237: 234: 231: 230: 229: 223: 219: 214: 205: 203: 199: 195: 190: 188: 183: 182:awning window 179: 175: 171: 170:brise soleils 166: 164: 159: 154: 148:Effectiveness 145: 143: 138: 136: 132: 122: 119: 114: 112: 107: 103: 100: 99:high pressure 96: 91: 82: 80: 76: 72: 68: 64: 60: 56: 52: 48: 43: 41: 37: 33: 29: 21: 2620:Fireproofing 2404:and services 2400:Professions, 2298:Gas detector 2198:Trickle vent 2173:Smoke damper 2168:Smoke canopy 2163:Space heater 2093:Plenum space 2028:Heating film 1908:Exhaust hood 1878:Dehumidifier 1818:Blast damper 1813:Barrier pipe 1788:Air purifier 1699:Thermosiphon 1578:Free cooling 1514: 1494:Chilled beam 1418:Thermal mass 1403:Stack effect 1388:Particulates 1368:Infiltration 1299:Fundamental 1234: 1230: 1220: 1211: 1206: 1194: 1182:. Retrieved 1173: 1166: 1149:11343/280700 1131: 1127: 1117: 1105: 1093: 1081: 1069: 1057: 1045: 1010: 1006: 993: 962:Stack effect 925:Windcatchers 918: 887: 879: 878: 870: 869: 864: 863: 858: 857: 854: 680: 676: 470: 276: 273: 254: 244: 238: 232: 227: 222:stack effect 191: 167: 155: 151: 139: 128: 118:overpressure 115: 106:low pressure 92: 88: 78: 74: 70: 67:cross-breeze 66: 44: 36:air pressure 27: 26: 2666:Ventilation 2630:Warm Spaces 2272:Blower door 2250:and control 2248:Measurement 2229:Windcatcher 2203:Trombe wall 2143:Sail switch 2123:Refrigerant 2118:Recuperator 1993:Grease duct 1953:Freeze stat 1938:Fire damper 1808:Back boiler 1778:Air ionizer 1773:Air handler 1737:Ventilation 1589:Hybrid heat 1454:Air barrier 1373:Latent heat 1237:: 386–394. 1013:: 263–280. 937:Windcatcher 194:wind speeds 71:cross-draft 51:ventilation 2660:Categories 2386:Thermostat 2308:Humidistat 2239:Zone valve 2208:TurboSwing 2083:Oil heater 2053:Humidifier 1983:Gas heater 1933:Fan heater 1903:Evaporator 1888:Economizer 1863:Compressor 1768:Air filter 1751:Components 1568:Forced-air 1464:Antifreeze 1437:Technology 1383:Outgassing 1323:Convection 968:References 55:pollutants 2496:Industry 2345:OpenTherm 2023:Heat pump 2018:Heat pipe 1968:Fume hood 1943:Fireplace 1848:Condenser 1798:Attic fan 1594:Hydronics 1184:10 August 1158:230593586 1052:CoolVent 1037:116029282 901:¯ 838:¯ 783:ρ 766:Δ 756:− 733:∫ 694:¯ 318:− 172:, doors, 2603:See also 2328:LonWorks 2262:Aquastat 2128:Register 2108:Radiator 1763:Air door 1563:Firestop 1363:Humidity 1338:Enthalpy 1328:Dilution 1313:Bake-out 1301:concepts 931:See also 270:Equation 102:windward 95:pressure 2402:trades, 1973:Furnace 1838:Chiller 1510:Coolant 1239:Bibcode 1015:Bibcode 263:density 259:atriums 249:hallway 218:leeward 174:louvers 125:Factors 85:Process 40:current 2555:SMACNA 2515:ASHRAE 2335:(MERV) 2289:(CADR) 2267:BACnet 2220:(ULPA) 2073:Louver 1998:Grille 1873:Damper 1823:Boiler 1721:(VCRS) 1522:(DOAS) 1156:  1035:  855:where 471:where 163:inflow 47:energy 2595:(VOC) 2589:(SBS) 2578:(IAQ) 2535:CIBSE 2530:BSRIA 2433:(BIM) 2377:(STP) 2341:(NTP) 1963:Freon 1733:(VRF) 1727:(VAV) 1585:(HRV) 1559:(ERV) 1533:(DCV) 1506:(CAV) 1178:(PDF) 1154:S2CID 1033:S2CID 1003:(PDF) 208:Types 178:ducts 2721:Wind 2550:LEED 2510:AMCA 2505:AHRI 2038:HEPA 1958:Flue 1883:Duct 1186:2023 485:wind 296:wind 77:and 32:wind 2560:UMC 2545:IIR 2525:BRE 1918:Fan 1247:doi 1144:hdl 1136:doi 1023:doi 1011:154 883:ref 2662:: 1245:. 1235:54 1233:. 1152:. 1142:. 1132:21 1130:. 1126:. 1031:. 1021:. 1009:. 1005:. 976:^ 543:p2 514:p1 327:p2 312:p1 81:. 73:, 69:, 1284:e 1277:t 1270:v 1253:. 1249:: 1241:: 1188:. 1160:. 1146:: 1138:: 1039:. 1025:: 1017:: 898:U 880:z 874:0 871:z 865:h 859:l 835:U 824:7 820:/ 816:1 811:f 808:e 805:r 801:z 796:z 792:d 779:) 776:z 773:( 770:P 762:2 749:h 742:0 738:z 726:p 723:C 717:l 711:d 707:C 700:= 691:Q 659:2 654:C 630:1 625:C 601:2 596:A 572:1 567:A 538:C 509:C 480:U 456:) 453:1 450:( 438:) 432:2 426:2 421:C 415:2 409:2 404:A 399:( 394:/ 390:1 387:+ 383:) 377:2 371:1 366:C 360:2 354:1 349:A 344:( 339:/ 335:1 322:C 307:C 291:U 287:= 284:Q 224:.

Index


wind
air pressure
current
energy
ventilation
pollutants
air-conditioner
indoor air quality
pressure
high pressure
windward
low pressure
wind pressures
overpressure
wind direction
Casement windows
stack ventilation
prevailing wind
inflow
brise soleils
louvers
ducts
awning window
exterior of the building
wind speeds
indoor air quality
disease prevention

leeward

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