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Monday, April 8, 2019

Laboratory Measurements and Diagnostics of Residential HVAC Installation and Maintenance Faults




File Size: 212 Kb

Description
Residential and commercial heating, ventilating, and air conditioning (HVAC) consumption in the United States accounts for 30% of average summer peak-day electricity loads, 13% of total electricity use, and 44% of total natural gas use [USEIA 2009]. A 2002 study published by the Hewlett Foundation indicates that improved HVAC installation and maintenance represents one of the largest economically achievable opportunities for energy efficiency savings [Rufo 2002]. This paper provides laboratory test results of a new 3-ton splitsystem 13-SEER air conditioner using R-22 refrigerant. Test conditions differ from those used to rate cooling systems to match typical installations in California. The equipment was set up in three chambers to simulate both AHRI 210/240 indoor and outdoor conditions and hot attic conditions. Laboratory test results are provided for HVAC faults that occur due to installation and maintenance deficiencies and degradation. Tests were conducted using thermostatic expansion valve (TXV) and non-TXV piston metering devices. Test results are provided for the following faults: uninsulated TXV sensing bulb, low airflow, ducts and equipment in 118०F hot attic, evaporator/condenser coil blockage, duct leakage, improper refrigerant charge, noncondensables, and restrictions.

Content:-
1. ABSTRACT
2. Introduction
3. Test Equipment and Laboratory Setup
4. Baseline Tests
5. Thermostatic Expansion Valve Tests
6. Airflow Tests
7. Evaporator Coil Blockage Tests
8. Duct Leakage Tests
9. Condenser Coil Blockage Tests
10. Refrigerant Charge Tests
11. Non-condensable Tests
12. Refrigerant Restriction Tests
13. Refrigerant Charge Diagnostic Test Matrix
14. Conclusion
Acknowledgments
References

Author Details
"Robert Mowris"

"Ean Jones" 

"Robert Eshom"

"Robert Mowris"




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