Air source falling film water chiller-heater unit

Abstract

The invention discloses an air source falling film water chiller-heater unit. The unit comprises a compressor, a four-way valve, a falling film heat exchanger, a reservoir, a drier, an expansion valve, an outdoor finned heat exchanger and an ejector, wherein the compressor, the falling film heat exchanger and the outdoor finned heat exchanger are connected with the four-way valve; the falling film heat exchanger is further connected with the reservoir and the ejector; the reservoir is connected with the drier; the ejector is connected with the drier and the expansion valve; and the expansion valve and the reservoir are connected with the outdoor finned heat exchanger. Due to the adoption of the air source falling film water chiller-heater unit, the interference of a gas-state refrigerant on a liquid distributor can be avoided, the structure of a liquid state distributor can be simplified, four layers or five layers are not required to be arranged, and uniform liquid distribution can be realized by adopting secondary liquid distribution; and under a heating working condition, air flow pressure drop can be reduced, the energy efficiency ratio of a system is increased, frequent impact of high-pressure and high-speed air flow on the liquid distributor can be avoided under the heating working condition, and the stability of a device is enhanced.

Description

technical field [0001] The invention relates to the field of air conditioning, in particular to an air source falling film cold and hot water unit. Background technique [0002] The earliest horizontal tube falling film evaporator technology was born in 1888, but only a few scholars devoted themselves to the research of this technology before the 1970s. Driven by the second oil crisis in the early 1980s, many scholars began to study this technology, focusing mainly on the application of horizontal tube falling film evaporators in ocean thermal energy conversion (OTEC) systems, so in the 1970s to 1980s The research on its working fluid and operating parameters in the 1990s was all aimed at the OTEC system. In the 1990s, with the phase-out of CFC, it began to be used in refrigeration systems. Compared with dry and flooded heat exchangers, horizontal tube falling film heat exchangers have obvious advantages: 1) Good heat transfer performance, high evaporation temperature, wh...

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Problems solved by technology

[0012] The structure of the falling film heat exchanger designed in this invention patent (CN101089520A) is ambiguous, the design of the inlet position of the refrigerant is unreasonable, and the adverse consequences caused by the impact of the gas on the liquid distributor are not considered, and the corresponding operation of the heat pump air conditioning system cannot be given. Schematic diagram of the process

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