Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 9 of 9 for “"Two-phase refrigerant"”.
-
A Study of Two-Phase Refrigerant Behavior in Flattened Tubes
… the tube include a substantial decrease in refrigerant mass, and a slightly decrease in overall tube length.
-
Adiabatic Developing Two-Phase Refrigerant Flow in Manifolds of Heat Exchangers
… designed for visualization (PDPA, photo) and two-phase flow distribution measurements for various inlet tube and flow characteristics. For most experiments, a transparent manifold in simplified geometry was used. Further experimental analysis is done for a manifold of a real plate evaporator. …
-
Design of test apparatus to analyze two-phase refrigerant flow distribution for furnace coil applications
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1994.
-
Vortex control of two-phase refrigerant flow in nozzles and its application in ejector vapor compression cycles
Vortex control is a novel two-phase convergent-divergent nozzle restrictiveness control mechanism which achieves flow control by adjustable nozzle inlet vortex strength. The nozzle can become more restrictive with increasing inlet vortex strength. Vortex control can potentially provide flow control …
-
Flash gas bypass - a way to improve distribution of adiabatic two-phase refrigerant flow in headers of microchannel evaporators
… to solve the existing problem of distribution of two phase adiabatic flow in headers of parallel flow evaporators, of typically microchannel design. Three main issues that will be explored in this thesis are: 1) separation of vapor-liquid refrigerant immediately after an expansion device in a …
-
Flow distribution in brazed plate heat exchangers
… as evaporators, the non-uniform distribution of two-phase refrigerant creates an unwanted superheated region, which has a lower heat transfer coefficient and a smaller temperature difference between the refrigerant and heat-source fluid, thus lowers the heat transfer rate. This dissertation …
-
Two phase flow distribution in parallel flow heat exchangers -- experimentally verified model
Maldistribution of refrigerant is a problem in parallel microchannel heat exchangers that lowers their potential effectiveness, especially when controlled by superheat. This paper describes modeling and numerical simulation of two phase mass flow distribution in a microchannel evaporator, on the …
-
Refrigerant flow distribution in vertical headers of reversible microchannel heat exchangers
… typically having vertical headers and more than two passes, may be used in either air-conditioning or heat pump mode in a reversible system. In heat pump mode, it functions as an evaporator and refrigerant maldistribution among parallel microchannel tubes creates unwanted superheated region, …
-
Periodic reverse flow in microchannel evaporators
… of the microchannel are recorded under both two phase feeding and liquid only feeding modes. In the two-phase feeding mode, churn, bubbly/slug, and annular flows occur alternatively, but the period of each flow regime is not constant. Flow reversal is only witnessed occasionally in the …