Ductless Mini-Split Heat Pump Comfort Evaluation
Ductless Mini-Split Heat Pump Comfort Evaluation
K. Roth, N. Sehgal, and C. Akers
Fraunhofer Center for Sustainable Energy Systems
March 2013
NOTICE
This report was prepared as an account of work sponsored by an agency of the United States government. Neither the United States government nor any agency thereof, nor any of their employees, subcontractors, or affiliated partners makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States government or any agency thereof.
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Ductless Mini-Split Heat Pump Comfort Evaluation
Prepared for: The National Renewable Energy Laboratory On behalf of the U.S. Department of Energy's Building America Program Office of Energy Efficiency and Renewable Energy
15013 Denver West Parkway Golden, CO 80401
NREL Contract No. DE-AC36-08GO28308
Prepared by: K. Roth, N. Sehgal, and C. Akers Fraunhofer Center for Sustainable Energy Systems
25 First Street, Suite 102 Cambridge, MA 02141
NREL Technical Monitor: Chuck Booten Prepared under Subcontract No. KNDJ-0-40345-00
March 2013
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Contents
List of Figures ............................................................................................................................................ vi List of Tables ............................................................................................................................................. vii Definitions................................................................................................................................................. viii Executive Summary ................................................................................................................................... ix 1 Introduction and Field Deployments .................................................................................................. 1
1.1 Introduction...................................................................................................................................... 1 1.2 Research Questions .......................................................................................................................... 2 1.3 Experimental Design and Field Deployments ................................................................................. 2
1.3.1 Field Deployment: Austin, Texas ....................................................................................... 2 2 Thermal Comfort Analysis................................................................................................................... 4
2.1 Procedures........................................................................................................................................ 4 2.1.1 Hourly Comfort Analysis.................................................................................................... 4
2.2 Daily Mean Temperature Analysis .................................................................................................. 5 2.2.1 Assumptions........................................................................................................................ 5
2.3 Thermal Comfort Based on ASHRAE Standard 55 (2004) ............................................................. 6 2.3.1 Thermal Comfort Based on Either Cooling or Heating Operation ..................................... 6 2.3.2 Thermal Comfort Performance in Cooling and Heating Modes......................................... 8
3 System Costs ...................................................................................................................................... 13 4 Conclusions and Recommendations ............................................................................................... 14 References ................................................................................................................................................. 15 Appendix A: Thermal Comfort Performance Graphs for ASHRAE Standard 55, for Household1.... 16
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