ASHRAE Journal - August 2022 - 26
TECHNICAL FEATURE
economizing, when ventilation is much less of a constraint,
using the algorithm's calculated setpoints continues
to minimize costs.
Conclusions
This article has discussed some of the trade-offs present
in HVAC systems in general and in VAV systems in
particular. By going through the ventilation efficiency
equations from ASHRAE Standard 62.1-2019, it has
revealed how providing and reheating extra discharge
air at the critical zone creates a trade-off with cooling
requirements at the air handler that can lead to
overall reduced energy consumption. This opens the
way for models like the one presented to be built and
implemented to provide significant savings. Therefore,
controls engineers and building automation suppliers
should consider including such models in their offerings,
and end users should express their demand for
these cost-saving algorithms.
References
1. Taylor, S. J. Stein, G. Paliaga, H. Cheng. 2012. " Dual maximum
VAV box control logic. " ASHRAE Journal 54(12).
2. ASHRAE Guideline 36-2018, High-Performance Sequences of
Operation for HVAC Systems.
3. ANSI/ASHRAE Standard 62.1-2019, Ventilation for Acceptable
Indoor Air Quality.
4. ANSI/ASHRAE Standard 90.1-2019, Energy Standard for Buildings
Except Low-Rise Residential Buildings.
5. Lin, X. J. Lau, G. Yuill. 2013. " CO2-Based Demand Controlled
Ventilation for Multiple Zone HVAC Systems. " ASHRAE Research
Project RP-1547, Final Report.
6. ANSI/ASHRAE Addenda, Addendum p to ANSI/ASHRAE
Standard 62.1-2013.
7. ANSI/ASHRAE Addenda, Addendum g to ANSI/ASHRAE
Standard 90.1-2016.
8. O'Neill, Z., Y. Li, X. Zhou, S. Taylor, H. Cheng. 2017.
" Implementation of RP-1547 CO2-based Demand Controlled
Ventilation for Multiple Zone HVAC Systems in Direct Digital
Control Systems. " ASHRAE Research Project RP 1747, Final Report.
9. Raftery, P., S. Li, B. Jin, M. Ting, et. al. 2018. " Evaluation of a
cost-responsive supply air temperature reset strategy in an office
building. " Energy and Buildings 158(1):356 - 370.
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ASHRAE Journal - August 2022
Table of Contents for the Digital Edition of ASHRAE Journal - August 2022
Contents
ASHRAE Journal - August 2022 - Intro
ASHRAE Journal - August 2022 - Cover1
ASHRAE Journal - August 2022 - Cover2
ASHRAE Journal - August 2022 - 1
ASHRAE Journal - August 2022 - Contents
ASHRAE Journal - August 2022 - 3
ASHRAE Journal - August 2022 - 4
ASHRAE Journal - August 2022 - 5
ASHRAE Journal - August 2022 - 6
ASHRAE Journal - August 2022 - 7
ASHRAE Journal - August 2022 - 8
ASHRAE Journal - August 2022 - 9
ASHRAE Journal - August 2022 - 10
ASHRAE Journal - August 2022 - 11
ASHRAE Journal - August 2022 - 12
ASHRAE Journal - August 2022 - 13
ASHRAE Journal - August 2022 - 14
ASHRAE Journal - August 2022 - 15
ASHRAE Journal - August 2022 - 16
ASHRAE Journal - August 2022 - 17
ASHRAE Journal - August 2022 - 18
ASHRAE Journal - August 2022 - 19
ASHRAE Journal - August 2022 - 20
ASHRAE Journal - August 2022 - 21
ASHRAE Journal - August 2022 - 22
ASHRAE Journal - August 2022 - 23
ASHRAE Journal - August 2022 - 24
ASHRAE Journal - August 2022 - 25
ASHRAE Journal - August 2022 - 26
ASHRAE Journal - August 2022 - 27
ASHRAE Journal - August 2022 - 28
ASHRAE Journal - August 2022 - 29
ASHRAE Journal - August 2022 - 30
ASHRAE Journal - August 2022 - 31
ASHRAE Journal - August 2022 - 32
ASHRAE Journal - August 2022 - 33
ASHRAE Journal - August 2022 - 34
ASHRAE Journal - August 2022 - 35
ASHRAE Journal - August 2022 - 36
ASHRAE Journal - August 2022 - 37
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ASHRAE Journal - August 2022 - Cover3
ASHRAE Journal - August 2022 - Cover4
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