Superheat control: a hybrid approach.(Report): An article from: HVAC & R Research
Book Details
ISBN / ASINB0033ERGFM
ISBN-13978B0033ERGF0
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Description
This digital document is an article from HVAC & R Research, published by American Society of Heating, Refrigerating, and Air-Conditioning Engineers, Inc. on November 1, 2009. The length of the article is 5339 words. The page length shown above is based on a typical 300-word page. The article is delivered in HTML format and is available immediately after purchase. You can view it with any web browser.
From the author: This paper examines the perennial problem of evaporator superheat control. While standard mechanical devices can operate effectively under design conditions, many behave poorly as conditions vary or under transient operation, resulting in degraded system performance, such as thermostatic expansion valve (TEV) hunting. Technological advances enabling electronic control help alleviate these problems by allowing more sophisticated control approaches to regulating superheat--for example, electronic expansion valves (EEVs). However, poorly tuned EEVs can still exhibit undesirable behavior, and frequent valve adjustments raise concerns about device longevity. In this work, we propose a cascaded control approach, which regulates evaporator pressure and superheat and is achieved with a feedback control device that uses a hybrid of mechanical and electronic feedback. Analysis of the fundamental dynamic behavior of evaporator superheat motivates this approach, while experimental evaluation of two separate systems demonstrates the efficacy of the approach as compared to standard control devices, such as TEV and EEV.
Citation Details
Title: Superheat control: a hybrid approach.(Report)
Author: Matthew Elliott
Publication:HVAC & R Research (Magazine/Journal)
Date: November 1, 2009
Publisher: American Society of Heating, Refrigerating, and Air-Conditioning Engineers, Inc.
Volume: 15 Issue: 6 Page: 1021(23)
Article Type: Report
Distributed by Gale, a part of Cengage Learning
From the author: This paper examines the perennial problem of evaporator superheat control. While standard mechanical devices can operate effectively under design conditions, many behave poorly as conditions vary or under transient operation, resulting in degraded system performance, such as thermostatic expansion valve (TEV) hunting. Technological advances enabling electronic control help alleviate these problems by allowing more sophisticated control approaches to regulating superheat--for example, electronic expansion valves (EEVs). However, poorly tuned EEVs can still exhibit undesirable behavior, and frequent valve adjustments raise concerns about device longevity. In this work, we propose a cascaded control approach, which regulates evaporator pressure and superheat and is achieved with a feedback control device that uses a hybrid of mechanical and electronic feedback. Analysis of the fundamental dynamic behavior of evaporator superheat motivates this approach, while experimental evaluation of two separate systems demonstrates the efficacy of the approach as compared to standard control devices, such as TEV and EEV.
Citation Details
Title: Superheat control: a hybrid approach.(Report)
Author: Matthew Elliott
Publication:HVAC & R Research (Magazine/Journal)
Date: November 1, 2009
Publisher: American Society of Heating, Refrigerating, and Air-Conditioning Engineers, Inc.
Volume: 15 Issue: 6 Page: 1021(23)
Article Type: Report
Distributed by Gale, a part of Cengage Learning
