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Single-coil twin-fan variable-air volume (VAV) system for energy-efficient conditioning of independent fresh and return air streams

一种空气调节系统、新鲜空气的技术，应用在空调系统、供暖和通风控制系统、供暖和通风安全系统等方向，能够解决双盘管系统造价高、双盘管系统不是非常节能等问题，达到盘管操作容易的效果

Inactive Publication Date: 2008-02-06
NAT UNIV OF SINGAPORE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the disadvantages of this double-coil design are also obvious
The basic disadvantage is that the dual coil system is not very energy efficient
Secondly, the double coil system is expensive because it requires more components

Method used

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  • Single-coil twin-fan variable-air volume (VAV) system for energy-efficient conditioning of independent fresh and return air streams
  • Single-coil twin-fan variable-air volume (VAV) system for energy-efficient conditioning of independent fresh and return air streams
  • Single-coil twin-fan variable-air volume (VAV) system for energy-efficient conditioning of independent fresh and return air streams

Examples

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Embodiment Construction

[0022] Referring to Figure 1, an HVAC system for ventilating and conditioning air in a building 4, generally designated by reference numeral 2, has 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 via a fresh air inlet 10 . The fresh air inlet 10 has a diffuser 11 to expand and slow 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 coil 20 . Coil 20 is a heat exchange coil with a single cooling water supply. 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 38 .

[0023] The second VAV syst...

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Abstract

An HVAC system (2) has two variable-air-volume (VAV) systems (6),(8), a first VAV system (6) for moving fresh air and a second VAV system (8) for moving recycled air. Both the fresh air and recycled air are cooled and dehumidified by a single heat-exchanging coil (20). The fresh and recycled air streams travel independently in separate ducts (26),(28) until the air streams reach a remotely located mixing box (38) where the air streams mix and ventilate into a room or zone of a building. The HVAC system uses carbon dioxide (34) and temperature (36) sensors in order to regulate the flow of fresh and recycled air to various mixing boxes throughout the building.

Description

technical field [0001] This invention relates to heating, ventilation and air conditioning (HVAC), and more particularly to energy efficient cooling and ventilation systems. Background technique [0002] Air conditioning, especially in hot climates, is an urgent need for cooling and dehumidification. HVAC technicians must find an optimal design that balances energy consumption and cost, thermal comfort and indoor air quality (IAQ), the latter criteria being a function of how well the building is ventilated. While health and thermal comfort issues can be addressed by attempting to eliminate various sources of indoor pollution, eliminating them completely is nearly impossible. Ventilation with fresh air thus inevitably plays an important role in the final air quality of the indoor environment. In hot conditions, high energy losses for cooling and dehumidification associated with ventilation are evident due to the large enthalpy difference between the outdoor air and indoor a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F24F13/30F24F3/044
CPCY02B30/78F24F3/0442F24F2011/0026Y02B30/94F24F2110/70Y02B30/70
Inventor C·谢卡尔谭国纬张国伟黄玉贤
Owner NAT UNIV OF SINGAPORE
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