制冷方面的英文论文

Technical Papers

33rd Annual Meeting International Institute of Ammonia Refrigeration

March 27–30, 2011

2011 Industrial Refrigeration Conference & Heavy Equipment Show

Caribe Royale

Orlando, Florida

ACKNOWLEDGEMENT

The success of the 33rd Annual Meeting of the International Institute of Ammonia Refrigeration is due to the quality of the technical papers in this volume and the labor of its authors. IIAR expresses its deep appreciation to the authors, reviewers and editors for their contributions to the ammonia refrigeration industry.

Board of Directors, International Institute of Ammonia Refrigeration

ABOUT THIS VOLUME

IIAR T echnical Papers are subjected to rigorous technical peer review.

The views expressed in the papers in this volume are those of the authors, not the International Institute of Ammonia Refrigeration. They are not official positions of the Institute and are not officially endorsed.

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2011 Industrial Refrigeration Conference & Heavy Equipment Show

Caribe Royale

Orlando, Florida

© IIAR 2011

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Abstract

One method of reducing system charge is through the use of secondary coolants. There are a number of advantages that can be realized including close humidification control, minimization of airborne contaminants, and elimination of the defrost cycle. This paper demonstrates the system and offers details of operation.

Technical Paper #1

Minimize Refrigerant Charge Using Liquid

Desiccant Dehumidification

Mike Harvey

Niagara Blower Company

Buffalo, New Y ork

Minimize Refrigerant Charge Using Liquid Desiccant Dehumidification

Reduced charge refrigeration systems which use desiccant technology can offer additional benefits such as:

• Increased safety

• Energy recovery

• Sanitized air

• Opportunity for LEED credit

• Humidity control

Introduction

Environmental, regulatory, and economic concerns are driving industrial facilities to design refrigeration systems which utilize the smallest refrigerant charge possible.

Light commercial and comfort conditioning systems already have relatively small refrigerant charges by using packaged rooftop equipment or using chilled water as a secondary coolant. However, process air conditioning system applications for food-related plants (including meat and poultry processing, processed foods production,

and brewing) and cold storage facilities have to date, primarily used distributed refrigeration systems. One method to reduce the system charge is by eliminating refrigerant distribution piping and replacing it with the distribution of secondary coolants, which are cooled by a low charge central chilling refrigeration system.

While this type of system obviously has the advantage of lowering refrigerant charges, there are several other benefits which can be derived.

Distributed Refrigerant Systems

Distributed refrigerant systems (shown in figure 1) utilize three basic connected components to provide cooling; an evaporator, a condenser and a compressor.

In order to carry the necessary refrigerant between the components, industrial

systems have extensive piping loops throughout each conditioned space which are Technical Paper #1 © IIAR 2011 3