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Title: The minimum capacity of HVAC secondary systems (with capacity reduction by interzonal airflow) (RP-1049)
Authors: Wright, Jonathan A.
Zhang, Yi
Issue Date: 2008
Publisher: © American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc.
Citation: WRIGHT, J. and ZHANG, Y., 2008. The minimum capacity of HVAC secondary systems (with capacity reduction by interzonal airflow) (RP-1049). HVAC&R Research, 14 (3), pp. 397-415
Abstract: To date, the performance of alternative HVAC secondary systems has been compared using either the systems’ energy use directly or by a life-cycle cost analysis. This paper introduces the concept of rating a system’s performance by comparing its capacity at a particular operating point to the thermodynamic minimum capacity. A simple ratio, termed the “system effectiveness,” is also introduced to indicate the extent to which the system operates with the minimum possible capacity. This paper describes the calculation of the minimum system capacity as a nonlinear, single- criterion, constrained optimization problem. In particular, it describes the case for the minimization of the system capacity by use of interzonal airflow (the interzonal airflow rates and zone thermal conditions being variables of the optimization). This optimization problem is multi-modal in that the same system capacity can result from more than one interzonal airflow configuration. The optimization problem has been solved here using a genetic algorithm (GA) search method. This paper illustrates the use of the minimum system capacity as a benchmark for the performance of a typical multizone heating, ventilating, and air-conditioning (HVAC) system. The example also illustrates the potential benefit of using interzonal airflow to reduce the required capacity of a system. It can be concluded from the example that the arrangement of the system components is a significant factor in determining the thermal effectiveness of HVAC systems.
Description: This is a journal article [© American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. (www.ashrae.org)]. Reprinted by permission from HVAC&R Research, Vol. 14, Part 3. Additional reproduction, distribution, or transmission in either print or digital form is not permitted without ASHRAE’s prior written permission. It is also available at: www.ashrae.org/hvacr-research
URI: https://dspace.lboro.ac.uk/2134/3699
ISSN: 1078-9669
Appears in Collections:Published Articles (Civil and Building Engineering)

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