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Title: System performance characteristics of a helical rotary screw air-cooled chiller operating over a range of refrigerant charge conditions

Abstract

This paper presents a study involving the operation of a 70-ton helical rotary, dual-circuit, air-cooled chiller while three independent variables are experimentally altered. The independent variables included in the study are refrigerant charge level within the chiller plant, outdoor air temperature, and percentage nominal chiller load. This paper examines the effects of the three independent variables on superheat and subcooling temperatures, chiller kW per ton, chilled water set-point temperature control, and compressor suction and discharge pressures. After analyzing the significance of refrigerant charge, outdoor air temperature, and percentage nominal chiller load on the operation of a chiller plant the consequences of refrigerant undercharge or overcharge are fully investigated and documented. All experimental testing was conducted in a full-scale heating, ventilation, and air-conditioning (HVAC) laboratory using a realistic load profile and actual outdoor air temperature conditions. Experimental testing began with an evacuation, recycle, and recharge of R-22 from both circuits of the chiller. The charge tests included holding the refrigerant charge in circuit No. 2 constant at the manufacturer`s recommended level. The notation adopted for the manufacturer`s recommended charge or nominal charge level was 0% charge. Circuit No. 1`s refrigerant charge was varied from {minus}60% to +15% of nominal charge inmore » 5% increments.« less

Authors:
 [1]
  1. Military Academy, West Point, NY (United States). Civil and Mechanical Engineering Dept.
Publication Date:
Sponsoring Org.:
National Science Foundation, Washington, DC (United States)
OSTI Identifier:
687598
Report Number(s):
CONF-980650-
Journal ID: ISSN 0001-2505; TRN: IM9944%%263
Resource Type:
Book
Resource Relation:
Conference: 1998 ASHRAE summer annual meeting, Toronto (Canada), 20 Jun 1998; Other Information: PBD: 1998; Related Information: Is Part Of ASHRAE transactions 1998: Technical and symposium papers. Volume 104, Part 2; PB: 1511 p.
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; REFRIGERATING MACHINERY; VAPOR COMPRESSION REFRIGERATION CYCLE; PARAMETRIC ANALYSIS; PERFORMANCE; SPACE HVAC SYSTEMS; EXPERIMENTAL DATA

Citation Formats

Bailey, M B. System performance characteristics of a helical rotary screw air-cooled chiller operating over a range of refrigerant charge conditions. United States: N. p., 1998. Web.
Bailey, M B. System performance characteristics of a helical rotary screw air-cooled chiller operating over a range of refrigerant charge conditions. United States.
Bailey, M B. 1998. "System performance characteristics of a helical rotary screw air-cooled chiller operating over a range of refrigerant charge conditions". United States.
@article{osti_687598,
title = {System performance characteristics of a helical rotary screw air-cooled chiller operating over a range of refrigerant charge conditions},
author = {Bailey, M B},
abstractNote = {This paper presents a study involving the operation of a 70-ton helical rotary, dual-circuit, air-cooled chiller while three independent variables are experimentally altered. The independent variables included in the study are refrigerant charge level within the chiller plant, outdoor air temperature, and percentage nominal chiller load. This paper examines the effects of the three independent variables on superheat and subcooling temperatures, chiller kW per ton, chilled water set-point temperature control, and compressor suction and discharge pressures. After analyzing the significance of refrigerant charge, outdoor air temperature, and percentage nominal chiller load on the operation of a chiller plant the consequences of refrigerant undercharge or overcharge are fully investigated and documented. All experimental testing was conducted in a full-scale heating, ventilation, and air-conditioning (HVAC) laboratory using a realistic load profile and actual outdoor air temperature conditions. Experimental testing began with an evacuation, recycle, and recharge of R-22 from both circuits of the chiller. The charge tests included holding the refrigerant charge in circuit No. 2 constant at the manufacturer`s recommended level. The notation adopted for the manufacturer`s recommended charge or nominal charge level was 0% charge. Circuit No. 1`s refrigerant charge was varied from {minus}60% to +15% of nominal charge in 5% increments.},
doi = {},
url = {https://www.osti.gov/biblio/687598}, journal = {},
issn = {0001-2505},
number = ,
volume = ,
place = {United States},
year = {1998},
month = {12}
}

Book:
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