Heat transfer compositions, methods, and systems
A technology of heat transfer and composition, applied in the field of heat transfer composition and system, can solve problems such as reducing system efficiency and reducing evaporator heat exchange efficiency
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[0506] As used in this application, the term "contacting with at least a portion" in its broad sense is intended to include each of said sequestering materials and any combination of sequestering materials as described herein with the refrigerant and / or in the system or lubricants, and is intended to include, but not necessarily be limited to, embodiments in which each type or specific chelating material is: (i) physically associated with each other type or specific material (if present) (ii) physically separate from each other type or specific material, if present, and (iii) where two or more materials are physically together and at least one of the chelating materials is associated with A physically separate combination of at least one other chelating material.
[0507] cryogenic system
[0508] A heat transfer system according to the present invention comprises a low temperature heat transfer system comprising a compressor, an evaporator, a condenser and an expansion dev...
Embodiment 1
[0940] Example 1: Vapor Jet Refrigeration System
[0941] The thermal stability of Refrigerant A2 was evaluated based on a standard sealed tube test according to ANSI / ASHRAE Standard 97-2007. Experimental results show that the preferred discharge temperature is 135°C or lower.
[0942] Variations in condensing temperature due to changing ambient conditions affect system performance and compressor discharge temperature. A refrigeration system comprising vapor injection and having a suction line heat exchanger was operated using a refrigerant consisting of composition A2 and having three different condensation temperatures (ie: 10°C, 32.2°C, 54.4°C). For each of these condenser temperatures, the system operates with essentially the same operating conditions / parameters, as follows:
[0943] figure 2 A vapor ejection refrigeration system of the type generally shown in removes vapor from a flash tank expansion device downstream of the condenser. This vapor stream is injected...
Embodiment 2
[0954] Example 2: Liquid Jet Refrigeration System
[0955] Refrigerant A2 was used in this example. Variations in condensing temperature due to changing ambient conditions affect system performance and compressor discharge temperature. image 3 A liquid injection refrigeration system of the type generally shown in , injects liquid refrigerant after the condenser into the first compression stage of the compression process and lowers the compressor discharge temperature. For this example, different maximum compressor discharge temperatures are specified, which require different amounts of injected refrigerant to maintain the maximum allowable discharge temperature. The goal is to be within 5% of the efficiency of the system without liquid injection.
[0956] The operating conditions are:
[0957] Condensation temperature = 10C, 32.2C, 54.4C;
[0958] Condenser subcooling = 5.5°C;
[0959] Evaporation temperature = -28.9°C;
[0960] Evaporator superheat = 5.5°C;
[0961]...
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Abstract
Description
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Application Information
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