Development of empirical temperature and humidity-based degraded-condition indicators for low-tonnage air conditioners /
(STO), or fixed-orifice expansion, and a system that uses a
| Main Author: | |
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| Format: | Thesis eBook |
| Language: | English |
| Published: |
[Place of publication not identified] :
[publisher not identified] ;
1997.
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| Subjects: | |
| Online Access: | Link to OAKTrust copy |
| Summary: | (STO), or fixed-orifice expansion, and a system that uses a A split-system direct-expansion air conditioner was used to an important factor for obtaining early detection over a wide automated detection systems for failures and degraded based approach. It sought to utilize only low-cost bench was equipped with the ability to use either a short- charge and a blocked condenser coil were not studied. conditions of low-tonnage air conditioners. The effects of degraded conditions studied include low evaporator airflow, depend on three loading factors; outdoor-air temperature, detect degraded conditions without regard to the expansion device. differentiated between a system that uses a shorttube orifice empirically determine temperature and return-air humidity high and low-charge, and a blocked condenser coil. The work identify degraded effects that fall outside of a simulation- indicators that could detect performance degradation is also shown that indicators of low evaporator airflow literature, the humidity sensing point has been neglected by presented in this thesis is experimentally based which could range of operating conditions. It was empirically based rather than model based to reduce computation time with a real-time processor. Further, the current work resulting from degraded conditions. The air conditioner test return-air temperature, and return-air humidity. In the STO system and a TXV system relative to the degradations studied, a common set of indicators was identified that could temperature sensing means, although return-air humidity was the loading factors on the indicators relative to improper thermal expansion valve (TXV), or variable-orifice expansion. This thesis shows that low-cost temperature sensors could be tube orifice (STO) or a thermal expansion valve (TXV). The used to detect the degraded conditions studied. However, it |
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| Item Description: | "Major subject: Mechanical Engineering". Vita. |
| Physical Description: | xxi, 184 leaves : illustrations ; 28 cm. Also available online. Issued also on microfiche from Lange Micrographics. |
| Bibliography: | Includes bibliographical references: pages 165-171. |