초록 ▼

A system and method of measuring duct leakage in an HVAC system including an indoor unit assembly operably coupled to a processing device, wherein at least one supply air conduit, and at least one return air conduit are coupled to the indoor unit assembly by operating a blower system at a nominal ai

A system and method of measuring duct leakage in an HVAC system including an indoor unit assembly operably coupled to a processing device, wherein at least one supply air conduit, and at least one return air conduit are coupled to the indoor unit assembly by operating a blower system at a nominal airflow rate, restricting airflow in each of the at least one supply air conduits, and each of the at least one return air conduits; operating the blower system, within the indoor unit assembly, at a first airflow rate; and operating the processing device to calculate a duct leakage airflow and duct leakage measurement.

대표청구항 ▼

1. A method for measuring duct leakage in an HVAC system including an indoor unit assembly including an indoor unit assembly control and a blower system, at least one supply air conduit coupled to the indoor unit assembly, at least one return air conduit coupled to the indoor unit assembly, and a pr

1. A method for measuring duct leakage in an HVAC system including an indoor unit assembly including an indoor unit assembly control and a blower system, at least one supply air conduit coupled to the indoor unit assembly, at least one return air conduit coupled to the indoor unit assembly, and a processing device operably coupled to the indoor unit assembly, the method comprising: (a) circulating air through the at least one supply air conduit and the at least one return air conduit;(b) operating the processing device to determine a nominal static pressure;(c) restricting airflow in each of the at least one supply air conduits, and each of the at least one return air conduit;(d) operating the processing device to determine a static pressure of the HVAC system;(e) operating the processing device to calculate a duct leakage airflow, wherein the duct leakage airflow is determined in response to the nominal static pressure, the static pressure and the airflow; and(f) operating the processing device to calculate a duct leakage measurement wherein the duct leakage measurement is determined in response to the duct leakage airflow. 2. The method of claim 1, wherein the processing device comprises a system control element. 3. The method of claim 1, wherein step (c) comprises closing a register coupled to each of the at least one supply air conduits and each of the at least one return air conduits. 4. The method of claim 1, wherein step (a) further comprises operating the indoor unit assembly control to operate the blower system at a nominal airflow rate. 5. The method of claim 1, wherein step (a) further comprises operating the indoor unit assembly control to operate the blower system at a first airflow rate. 6. The method of claim 1, wherein the blower system comprises a motor and a blower. 7. The method of claim 6, wherein the motor comprises a variable speed motor. 8. The method of claim 1, wherein the duct leakage airflow is calculated using the formula: Qleak=Q1×sqrt(ESPnom÷ESP1). 9. The method of claim 1, wherein the duct leakage measurement comprises a duct leakage rate. 10. The method of claim 9, wherein the duct leakage measurement comprises a duct leakage percentage. 11. The method of claim 10, wherein the duct leakage percentage is calculated using the formula: Duct leakage percentage=(2×Qleak)÷Qnom×100. 12. The method of claim 9 wherein the duct leakage rate is calculated using the formula: Duct leakage rate=2×Qleak. 13. An HVAC system comprising: an indoor unit assembly comprising: an indoor unit assembly control; anda blower system configured to circulate air;a processing device operably coupled to the indoor unit assembly;at least one supply air conduit coupled to the indoor unit assembly, the at least one supply air conduit configured to distribute the air; andat least one return air conduit coupled to the indoor unit assembly; wherein the processing device is configured to: (a) determine a nominal static pressure when the blower system operates at a nominal airflow rate;(b) determine a static pressure when the blower system operates at a first airflow rate, the first airflow rate different than the nominal airflow rate;(c) calculate a duct leakage airflow, wherein the duct leakage airflow is determined in response to the nominal static pressure, the static pressure and the first airflow rate; and(d) calculate a duct leakage measurement, wherein the duct leakage measurement is determined in response to the duct leakage airflow. 14. The HVAC system of claim 13, further comprising a register coupled to each of the at least one supply air conduits, and each of the at least one return air conduits. 15. The HVAC system of claim 13, wherein the indoor unit assembly is selected from the group consisting of: an air handler and a furnace. 16. The HVAC system of claim 13, wherein the processing device comprises a system control element. 17. The HVAC system of claim 13, wherein the blower system comprises a motor and a blower. 18. The HVAC system of claim 17, wherein the motor comprises a variable speed motor. 19. The HVAC system of claim 13, wherein the indoor unit assembly control is to operate the blower system at the nominal airflow rate. 20. The HVAC system of claim 13, wherein the indoor unit assembly control is to operate the blower system at first airflow rate. 21. The HVAC system of claim 13, wherein the processing device calculates the duct leakage airflow using the formula: Qleak=Q1×sqrt(ESPnom÷ESP1). 22. The HVAC system of claim 13, wherein the duct leakage measurement comprises a duct leakage rate. 23. The HVAC system of claim 22, wherein the duct leakage measurement comprises a duct leakage percentage. 24. The HVAC system of claim 23, wherein the duct leakage percentage is calculated using the formula: Duct leakage percentage=(2×Qleak)÷Qnom×100. 25. The HVAC system of claim 22, wherein the duct leakage rate is calculated using the formula: Duct leakage rate=2×Qleak.