Dynamic Performance of an Electronic Zone Air Temperature Control Loop in a Typical Variable-Air-Volume Air Conditioning System

Hung, Charles Y.S.; Lam, H. N.; Dunn, A.

doi:10.1080/10789669.1999.10391241

Cited by 15 publications

(5 citation statements)

References 4 publications

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“…Thermostats are very common in industrial and building thermal control applications [38,39], and some authors have specifically looked at the modeling of system behavior due to thermostats. This has included whole building energy simulations [40], hot-water heaters [41], household refrigerators [42], engine cooling [43,44], variable-air-volume air conditioning [45], radiant floor heating [46], automotive thermostats [47], thermostatically controlled appliances [48] and the energy performance of coupled-control units [49].…”

Section: Introductionmentioning

confidence: 99%

Synchronization of self-sustained thermostatic oscillations in a thermal-hydraulic network

Cai

Sen

Yang

et al. 2006

International Journal of Heat and Mass Transfer

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Section: Introductionmentioning

confidence: 99%

Synchronization of self-sustained thermostatic oscillations in a thermal-hydraulic network

Cai

Sen

Yang

et al. 2006

International Journal of Heat and Mass Transfer

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“…This equation is used to compute the flow rate correction factor, Á L , for each loop in the network. From equation (15), it can be further simplified as follows to the satisfaction of usage…”

Section: Static Balance Duct Design Methodsmentioning

confidence: 99%

“…Charles Hung et al. 15 performed a study to compare pressure-dependent and pressure-independent VAV systems. It is found that for complex systems, the pressure-independent method is preferred because it provides slightly superior performance.…”

Section: Literature Reviewmentioning

confidence: 99%

Static balance duct design method and temperature dependent variable air volume systems

Kong

2019

Building Services Engineering Research and Technology

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In hot and humid tropical countries, the air-conditioning system has a high energy usage in commercial buildings. This study introduces a static balance duct design method for a temperature dependent variable air volume system. Ducts are looped together, which cause the air to self-balance and minimize the pressure loss across the duct network. The static balance duct network can easily identify the critical zone of highest pressure loss. This zone appears at the longest duct length from the air source and is always consistent for different load conditions. The air supplied to this critical zone is controlled by the zone temperature sensor, which directs feedback to the variable frequency drive fan of the air-handling unit. The rest of the variable air volume terminal units are zone temperature controlled. The duct looping design mitigates the problems in pressure variations and complements the temperature dependent control strategy. An open office case study is carried out to demonstrate the merit of the static balance duct design method. An actual installation was completed in a shopping mall. The recorded temperature readings verified that the static balance duct network and temperature dependent variable air volume air-conditioning system is operational and functional. Approximately 27% energy savings is achieved compared to the constant air volume system. Practical application: The static balance duct design method is a combination of equal friction duct design method and a loop duct network. This static balance duct network can identify the critical zone of highest pressure loss and this zone is always consistent. In this temperature-dependent variable air volume (TDVAV), the variable air volume (VAV) terminal unit at the critical zone is eliminated. The zone temperature sensor at the critical zone provides direct feedback to the variable frequency drive fan. All other terminal units are temperature dependent. The static balance TDVAV system enhances energy savings, improves the performance of VAV system and reduces the faults for VAV systems.

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“…This control strategy is widely employed in commercial buildings with one AHU serving several rooms or zones [12,13]. With the use of VAV boxes located at the air outlets of each room, the amount of air supplied to the room can be varied according to its heat load.…”

Section: Overall Heat Transfer Coefficient For a Finite Tube Sectionmentioning

confidence: 99%

A model to study the effects of different control strategies on space humidity during part-load conditions

Chua

Chou

2008

Building and Environment

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Dynamic Performance of an Electronic Zone Air Temperature Control Loop in a Typical Variable-Air-Volume Air Conditioning System

Cited by 15 publications

References 4 publications

Synchronization of self-sustained thermostatic oscillations in a thermal-hydraulic network

Synchronization of self-sustained thermostatic oscillations in a thermal-hydraulic network

Static balance duct design method and temperature dependent variable air volume systems

A model to study the effects of different control strategies on space humidity during part-load conditions

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