G-06 Guide Engineers to Achieve A Fully Decoupled ACB Design Solution

PROJECT INFORMATION
Graphic Name:

G-06 Guide Engineers to Achieve A Fully Decoupled ACB Design Solution

Submitted By:

Yiyuan Jia

Firm Name:

Other contributors or acknowledgements (optional):

What tools did you use to create the graphic?
What kind of graphic is this?

Primary Inputs:

Primary Air Flow Rates of Active Chilled Beam

Primary Outputs:

Primary Air Flow Rates of Active Chilled Beam

Graphic Information

What is the graphic showing?

The graphics are created base on an in-house HVAC design assist tool, the 5 radar charts illustrate the design primary air flow rates driven by outdoor air, sensible cooling, sensible heating, and latent cooling accordingly. In ACB design, the outer most primary air flow in the radar chart would anchor the design primary air flow rate and used for equipment selection. We analyzed different strategies that would reduce the design primary air flow and leave only the ventilation air as the driver, the goal is to achieve a fully decoupled ACB system design.

How did you make the graphic?

The calculation is performed by a in-house HVAC simulation tool. Graphics are made with Excel and Photoshop.

What is the graphic showing?

The graphics are created base on an in-house HVAC design assist tool, the 5 radar charts illustrate the design primary air flow rates driven by outdoor air, sensible cooling, sensible heating, and latent cooling accordingly. In ACB design, the outer most primary air flow in the radar chart would anchor the design primary air flow rate and used for equipment selection. We analyzed different strategies that would reduce the design primary air flow and leave only the ventilation air as the driver, the goal is to achieve a fully decoupled ACB system design.

What specific investigation questions led to the production of this graphic? List them:

How to achieve a fully decoupled ACB system design and save the most energy.

How does this graphic fit into the larger design investigations and what did you learn from producing the graphic?

The graphics allows us to design the ACB systems with greater insights on the drivers of the design primary air flow rate and think about strategies to minimized the air flow rates.

What was successful and/or unique about the graphic in how it communicates information?

Integrate architectural design strategies into HVAC design.

What would you have done differently with the graphic if you had more time/fee?

Investigate more architectural design strategies and the interactions with HVAC design. Fine tune the equipment selections and balanced out the design through architectural design features.

Is there anything else you'd like to mention? This can be in terms of your graphic ouput, this form, or suggestions for improving the submission process in general?

A HVAC design-oriented building simulation tool is developed based on the ISO-13790 standard: Energy performance of buildings – Calculation of energy use for space heating and cooling. This tool calculates space heating and cooling demands with the five resistances, one capacitance (5R1C) model as defined in ISO 13790, the hourly hearing and cooling demands are then used to develop the down steam calculations of energy consumption of HVAC components, such as fans, pumps, coils and plants. In active chilled beam design, a fully decoupled system is ideal as no extra air is re-cooled or re-heated in the terminal, leaving only ventilation as the driver for primary air. In this case study, we demonstrate our design evolution in achieving a fully decoupled chilled beam design.

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