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Title: Energy and Economics Analyses of Condenser Evaporative Precooling for Various Climates, Buildings and Refrigerants

Abstract

Condenser evaporative pre-coolers provide a low cost retrofit option for existing packaged rooftop air conditioning application units. This paper aimed to provide a comprehensive study to assess energy savings and peak power reductions of condenser evaporative cooling. Condenser evaporative cooling leads to a lower temperature of the air entering the condenser of a rooftop unit, which results in smaller compressor power consumption. Utilizing EnergyPlus building energy simulations, we mapped the impacts on energy savings and energy reductions at peak ambient temperatures in three building types and 16 locations with levels of pad effectiveness and demonstrated the effects on air conditioner using either R22 or R410A as refrigerants. Economics and control strategy to maximize the cost saving were also investigated. The conclusions demonstrate that energy savings are much greater for HVAC systems with the refrigerant R410A than they are with R22, and evaporative pre-cooling provides the opportunity for annual energy savings and peak demand reductions, with significant potential in hot, dry climates. Additionally, we validated an improved mathematical model for estimating the condenser pre-cooling wet bulb efficiency which shows clear advantage over the current EnergyPlus model.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Building Technologies Office (EE-5B)
OSTI Identifier:
1524850
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Energies (Basel)
Additional Journal Information:
Journal Name: Energies (Basel); Journal Volume: 12; Journal Issue: 11; Journal ID: ISSN 1996-1073
Publisher:
MDPI AG
Country of Publication:
United States
Language:
English
Subject:
29 ENERGY PLANNING, POLICY, AND ECONOMY; condenser evaporative precooling; rooftop air conditioners; building energy modelling; control strategy

Citation Formats

Shen, Bo, New, Joshua Ryan, and Ally, Moonis Raza. Energy and Economics Analyses of Condenser Evaporative Precooling for Various Climates, Buildings and Refrigerants. United States: N. p., 2019. Web. doi:10.3390/en12112079.
Shen, Bo, New, Joshua Ryan, & Ally, Moonis Raza. Energy and Economics Analyses of Condenser Evaporative Precooling for Various Climates, Buildings and Refrigerants. United States. doi:10.3390/en12112079.
Shen, Bo, New, Joshua Ryan, and Ally, Moonis Raza. Fri . "Energy and Economics Analyses of Condenser Evaporative Precooling for Various Climates, Buildings and Refrigerants". United States. doi:10.3390/en12112079. https://www.osti.gov/servlets/purl/1524850.
@article{osti_1524850,
title = {Energy and Economics Analyses of Condenser Evaporative Precooling for Various Climates, Buildings and Refrigerants},
author = {Shen, Bo and New, Joshua Ryan and Ally, Moonis Raza},
abstractNote = {Condenser evaporative pre-coolers provide a low cost retrofit option for existing packaged rooftop air conditioning application units. This paper aimed to provide a comprehensive study to assess energy savings and peak power reductions of condenser evaporative cooling. Condenser evaporative cooling leads to a lower temperature of the air entering the condenser of a rooftop unit, which results in smaller compressor power consumption. Utilizing EnergyPlus building energy simulations, we mapped the impacts on energy savings and energy reductions at peak ambient temperatures in three building types and 16 locations with levels of pad effectiveness and demonstrated the effects on air conditioner using either R22 or R410A as refrigerants. Economics and control strategy to maximize the cost saving were also investigated. The conclusions demonstrate that energy savings are much greater for HVAC systems with the refrigerant R410A than they are with R22, and evaporative pre-cooling provides the opportunity for annual energy savings and peak demand reductions, with significant potential in hot, dry climates. Additionally, we validated an improved mathematical model for estimating the condenser pre-cooling wet bulb efficiency which shows clear advantage over the current EnergyPlus model.},
doi = {10.3390/en12112079},
journal = {Energies (Basel)},
number = 11,
volume = 12,
place = {United States},
year = {2019},
month = {5}
}

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