To analyze the effects of the leakage recharge of the aquifer on the initial dewatering of coalbed methane wells, the mathematical seepage model of water in the coalbed considering the aquifer leakage was established by using the leakage coefficient according to the unsteady seepage theory.
Based on the definition of leakage coefficient b = [k.
The leakage is modeled by the product of a constant leakage coefficient
A flow coefficient increase beyond 75% would represent an unrealistic leakage coefficient
based on the data gathered from real buildings (Persily 1998).
Figures 6 through 8 investigate the effect of motor efficiency, the flank leakage coefficient
, and the shell heat transfer coefficient on isentropic efficiency, volumetric efficiency, and compressor discharge temperature.
i] = total leakage coefficient
for wall or ceiling i
Each leakage location on a wall had the same leakage coefficient
The value for the envelope leakage coefficient
For ASTM E1554 pressure station testing, this shift is achieved by performing a least squares fit to envelope flow and pressure data to determine the envelope leakage coefficient
and pressure exponent (as is done in a standard blower door test, such as ASTM E779-03).
[alpha] and [beta] involved in Equation 19 are given in Table 2 in the fifth and sixth columns.
A least squares power law curve fit was employed per Equation 7, and the duct leakage coefficients
, C and N, were found.
The building leakage coefficients
were calibrated based on the measured indoor and outdoor concentration data at night when the HVAC system was shut down.