An evaluation of three commercially available technologies forreal-time measurement of rates of outdoor airflow into HVAC systems
During the last few years, new technologies have been introduced for real-time continuous measurement of the flow rates of outdoor air (OA) into HVAC systems; however, an evaluation of these measurements technologies has not previously been published. This document describes a test system and protocols developed for a controlled evaluation of these measurement technologies. The results of tests of three commercially available measurement technologies are also summarized. The test system and protocol were judged practical and very useful. The three commercially available measurement technologies should provide reasonably, e.g., 20%, accurate measurements of OA flow rates as long as air velocities are maintained high enough to produce accurately measurable pressure signals. In HVAC systems with economizer controls, to maintain the required air velocities the OA intake will need to be divided into two sections in parallel, each with a separate OA damper. All of the measurement devices had pressure drops that are likely to be judged acceptable. The influence of wind on the accuracy of these measurement technologies still needs to be evaluated.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE. Assistant Secretary for Energy Efficiency andRenewable Energy. Office of the Building Technologies Program
- DOE Contract Number:
- DE-AC02-05CH11231
- OSTI ID:
- 886986
- Report Number(s):
- LBNL-56603; ASHTAG; R&D Project: 474515; BnR: BT0201000; TRN: US200617%%423
- Journal Information:
- ASHRAE Transactions, Vol. 111, Issue pt2; Related Information: Journal Publication Date: 2005; ISSN 0001-2505
- Country of Publication:
- United States
- Language:
- English
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