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논문 기본 정보
- 자료유형
- 학술대회자료
- 저자정보
- 발행연도
- 1989.11
- 수록면
- 66 - 71 (6page)
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초록· 키워드
오류제보하기
A knowledge of thermodynamic property values of moist air is essential in the design and analysis of HVAC systems. Historically these values have been obtained graphically from psychrometric charts. This paper describes an interactive computer program to obtain psychrometric over the "normal" temperature range of 30 F to 120 F and at or close to standard atmospheric pressures.
The program was written with the following three objectives and criteris in mind.
1. That it be as short and simple as possible, thus making it appropriate for use with microcomputers.
2. It must yield accurate results. (error ＜ ±1%)
3. It must be simple to use or "friendly".
The program is menu-driven. The three inputs are: (1) barometric pressures: (2) dry bulb temperature: and (3) a choice of either wet bulb temperature, dew point temperature, or relative humidity. User must choose between SI or English units. The eight outputs are: barometric pressure: dry bulb, wet bulb, and dew point temperatures: relative humidity: humidity ratio: specific enthalpy: and speiffic volume.
Although written as a stand-alone program, it is easily adaptable for use as subroutine if desired. The program is written in basic to run on an 18M PC. A fortran version is also avaliable.
The program utilizes equations relating saturation pressure and saturation temperature that were obtained by a least squares curve fit to steam table property values. Perfect gas behavior is assumed for both the dry air abd water vapor abd Dalton's law for partial pressures is utilized. A significant number of points have been checked with various inputs to determine output accuracy using the ASHRAE tables for thermodynamic properties of moist air as standard. All checks have yielded errors less than 0.5%.
The program was written with the following three objectives and criteris in mind.
1. That it be as short and simple as possible, thus making it appropriate for use with microcomputers.
2. It must yield accurate results. (error ＜ ±1%)
3. It must be simple to use or "friendly".
The program is menu-driven. The three inputs are: (1) barometric pressures: (2) dry bulb temperature: and (3) a choice of either wet bulb temperature, dew point temperature, or relative humidity. User must choose between SI or English units. The eight outputs are: barometric pressure: dry bulb, wet bulb, and dew point temperatures: relative humidity: humidity ratio: specific enthalpy: and speiffic volume.
Although written as a stand-alone program, it is easily adaptable for use as subroutine if desired. The program is written in basic to run on an 18M PC. A fortran version is also avaliable.
The program utilizes equations relating saturation pressure and saturation temperature that were obtained by a least squares curve fit to steam table property values. Perfect gas behavior is assumed for both the dry air abd water vapor abd Dalton's law for partial pressures is utilized. A significant number of points have been checked with various inputs to determine output accuracy using the ASHRAE tables for thermodynamic properties of moist air as standard. All checks have yielded errors less than 0.5%.
목차
ABSTRACT
DEFINITION OF TERMS
TECHNIQUES USED TO DETERMINE MOIST AIR PROPERTIES
FEATURES OF PSYCHROM
SUMMARY
REFERENCES
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