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Energy-efficient variable-air volume (VAV) system with zonal ventilation control

A variable air volume, air conditioning system technology, applied in heating and ventilation control systems, heating and ventilation safety systems, space heating and ventilation control inputs, etc., can solve problems such as insufficient fresh air ventilation, and achieve good ventilation.

Inactive Publication Date: 2005-04-27
NAT UNIV OF SINGAPORE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Prior art designs often suffer from insufficient fresh air ventilation of localized areas due to the throttling of the fresh air damper as the volumetric flow rate in the VAV system decreases to lower load conditions

Method used

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  • Energy-efficient variable-air volume (VAV) system with zonal ventilation control
  • Energy-efficient variable-air volume (VAV) system with zonal ventilation control
  • Energy-efficient variable-air volume (VAV) system with zonal ventilation control

Examples

Experimental program
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Embodiment Construction

[0019] refer to figure 1 , an HVAC system generally indicated by reference numeral 2 for ventilation and air conditioning within a building 4, having an air handling unit (AHU) 5 comprising two separate variable air volume (VAV) systems 6, 8 . The first VAV system 6 introduces fresh air from the outside through a fresh air inlet 10 . The fresh air inlet 10 has a diffuser 11 which enlarges and slows down the fresh air for maximum heat transfer. The fresh air is first filtered by the fresh air filter 14, and then cooled and dehumidified by the fresh air coil 18. The fresh air coil 18 is a heat exchange coil with a cold water supply only. The fresh air fan 22 pushes the conditioned fresh air flow downstream through the fresh air duct 26 to the fresh air VAV box 30 . The fresh air VAV box 30 is connected to a mixing box 38 into which fresh air can flow. The fresh air damper 31 regulates the flow of conditioned fresh air into a mixing chamber 39 which is part of a mixing box 3...

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Abstract

A ventilation and air-conditioning system uses a first variable-air-volume system to cool and dehumidify fresh outside air and deliver it through a first duct to a mixing box located downstream. The system also uses a second variable-air-volume system to further cool and dehumidify recycled air and deliver it through a second duct to the mixing box where the fresh and recycled air are able to mix prior to ventilation into a room or office. The system uses a carbon dioxide sensor and a temperature sensor to provide feedback signals to a control system, which in turn regulates fan speeds and damper openings in order to provide optimal cooling and ventilation and to conserve energy when cooling and ventilation requirements are low.

Description

technical field [0001] This invention relates to heating, ventilation and air conditioning (HVAC), and more particularly to energy efficient systems that optimize indoor air quality. Background technique [0002] The generation of indoor pollutants and the ability of ventilation systems to remove indoor pollutants affect the air quality of the indoor environment. Although hygiene and thermal comfort can often be achieved by trying to eliminate various indoor pollutants. But it's nearly impossible to get rid of them completely. This intake of fresh air inevitably plays an important role in the air quality of the indoor environment. In the design of the ventilation system, an adequate supply of the total amount of fresh air at the fresh air inlet of the air handling unit (AHU) cannot be fully ensured, but it is equally important to consider the relevant ventilation characteristics. Fresh air reaches the local "breathing zones" of the various occupied areas in proper proport...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24F3/044F24F11/00
CPCY02B30/78F24F3/0442Y02B30/767F24F2011/0026F24F11/0034Y02B30/28Y02B30/94F24F11/30F24F2110/70F24F2120/10Y02B30/70F24F11/77F24F11/46
Inventor C·谢卡尔K·W·探K·W·D·昌N·H·王
Owner NAT UNIV OF SINGAPORE
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