Globally, ductless heat pumps are the standard method of heating and cooling residential and commercial buildings. In North America the post-war building boom favoured ducted systems but we since realized there are advantages to ductless systems, especially to cool.

For commercial applications, Variable Refrigerant Volume (or Flow) systems are quickly becoming an option of choice in North America. In Japan where VRV/F was invented in 1982 half of all small commercial buildings use this ductless system.

If you are in Ontario contact me at ductlessontario@gmail.com for design, pricing, selection, installation, or technical assistance. Posts here are provided for information purposes only and not necessarily endorsed.

Tuesday, August 28, 2012

MODELING AND EXPERIMENT ANALYSIS OF VARIABLE REFRIGERANT FLOW AIR-CONDITIONING SYSTEMS


by
Xuhui Wang, Jianjun Xia, Xiaoliang Zhang, Sumio Shiochi, Chen Peng, Yi Jiang
Department of Building Science, Tsinghua University, Beijing, China
Environmental Technology Lab., Daikin Industries, Ltd., Osaka, Japan

for

Eleventh International IBPSA Conference
Glasgow, Scotland
July 27-30, 2009



ABSTRACT

This study developed a component-based gray-box model for variable refrigerant flow (VRF) airconditioning systems to simulate and predict the performance and energy consumption of VRF system in cooling condition. Results from the testing of Daikin’s 10HP VRV system with six indoor units, as well as the manufacturer’s data, were used to fit the key parameters of each component in this VRF model. This model was integrated in the building energy simulation software DeST and was validated by using data both from Daikin’s product handbook and from tested results. The validation results showed that this model can be used to calculate the coefficient of performance (COP) of VRF systems in an error of less than 15%.

[Continued...pdf]
Posted by at

No comments:

Post a Comment

Subscribe to: Post Comments (Atom)