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Title: DEVELOPMENT OF 20 IEER ROOFTOP UNITS A SIMULATION STUDY

Abstract

Based on detailed steady-state system and component modeling, we developed a rooftop unit system design, which is able to achieve IEER (Integrated Energy Efficiency Ratio) higher than 20. We modeled fin-&-tube and micro-channel heat exchangers using segment-to-segment approach, and use ARI 10-coefficient compressor map to simulate compressor performance. The system modeling is based on a component-based modeling approach, which facilitates flexible simulation of complicated system configurations. Starting with a baseline system having IEER of 16.6, we extensively investigated numerous technical options, i.e. varying compressor sizes, heat exchanger fin densities, fin-&-tube or micro-channel heat exchanger, suction line heat exchanger, desiccant wheel, tandem compressor, variable-speed compressor, and condenser evaporative pre-cooling; and developed an innovative system configuration combining a tandem compression system with a variable-speed compression system. The combined system can achieve high IEER as well as process the outdoor ventilation air over an extensive range. We successfully evaluated the design concept for a 20-ton unit as well as a 10-ton unit. All the selected components are readily accessible on the market, and we validated the performance predictions against existing RTU products at the rating condition. This paper illustrates a potentially cost-effective high IEER RTU design.

Authors:
 [1];  [1];  [2]
  1. ORNL
  2. Oak Ridge National Laboratory (ORNL)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Building Technologies Research and Integration Center
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1081919
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Conference
Resource Relation:
Conference: International Refrigeration and Air Conditioning Conference at Purdue, July 16-19, 2012, West Lafayette, IN, USA, 20120716, 20120719
Country of Publication:
United States
Language:
English
Subject:
Rooftop Air Conditioner; Modeling

Citation Formats

Shen, Bo, Rice, C Keith, and Vineyard, Edward. DEVELOPMENT OF 20 IEER ROOFTOP UNITS A SIMULATION STUDY. United States: N. p., 2012. Web.
Shen, Bo, Rice, C Keith, & Vineyard, Edward. DEVELOPMENT OF 20 IEER ROOFTOP UNITS A SIMULATION STUDY. United States.
Shen, Bo, Rice, C Keith, and Vineyard, Edward. Sun . "DEVELOPMENT OF 20 IEER ROOFTOP UNITS A SIMULATION STUDY". United States.
@article{osti_1081919,
title = {DEVELOPMENT OF 20 IEER ROOFTOP UNITS A SIMULATION STUDY},
author = {Shen, Bo and Rice, C Keith and Vineyard, Edward},
abstractNote = {Based on detailed steady-state system and component modeling, we developed a rooftop unit system design, which is able to achieve IEER (Integrated Energy Efficiency Ratio) higher than 20. We modeled fin-&-tube and micro-channel heat exchangers using segment-to-segment approach, and use ARI 10-coefficient compressor map to simulate compressor performance. The system modeling is based on a component-based modeling approach, which facilitates flexible simulation of complicated system configurations. Starting with a baseline system having IEER of 16.6, we extensively investigated numerous technical options, i.e. varying compressor sizes, heat exchanger fin densities, fin-&-tube or micro-channel heat exchanger, suction line heat exchanger, desiccant wheel, tandem compressor, variable-speed compressor, and condenser evaporative pre-cooling; and developed an innovative system configuration combining a tandem compression system with a variable-speed compression system. The combined system can achieve high IEER as well as process the outdoor ventilation air over an extensive range. We successfully evaluated the design concept for a 20-ton unit as well as a 10-ton unit. All the selected components are readily accessible on the market, and we validated the performance predictions against existing RTU products at the rating condition. This paper illustrates a potentially cost-effective high IEER RTU design.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2012},
month = {1}
}

Conference:
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