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Method and apparatus for staged startup of air-cooled low charged packaged ammonia refrigeration system

A technology of refrigeration system and refrigerant, which is applied in the field of ammonia refrigeration system and can solve the problems of low filling volume and so on

Active Publication Date: 2021-09-03
EVAPCO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is unacceptable for low charge and critical charge ammonia refrigeration systems

Method used

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  • Method and apparatus for staged startup of air-cooled low charged packaged ammonia refrigeration system
  • Method and apparatus for staged startup of air-cooled low charged packaged ammonia refrigeration system
  • Method and apparatus for staged startup of air-cooled low charged packaged ammonia refrigeration system

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Embodiment Construction

[0009] figure 1 is a process and instrumentation diagram for a single compressor, air cooled (non-evaporative) condenser, low charge encapsulated overhead refrigeration system according to one embodiment of the invention. figure 2 yes figure 1 Enlarged view of the upper right portion. image 3 is a process and instrumentation diagram of a dual-compressor, air-cooled condenser, low charge package overhead refrigeration system according to an embodiment of the present invention. Figure 4 yes image 3 Enlarged view of the upper right portion.

[0010] The system comprises evaporators 2a and 2b (comprising evaporator coils 4a and 4b respectively), condenser 8, compressor 10, expansion devices 11a and 11b (which may be provided in the form of valves, metering orifices or other expansion devices) , pump 16, vapor / liquid separator 12 and economizer 14. According to one embodiment, the vapor / liquid separation device 12 may be a recycler vessel. According to other embodiments,...

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PUM

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Abstract

Apparatus for staged startup of air-cooled low charged packaged ammonia refrigeration system includes motorized valves on condenser coil inlets, a main compressor discharge motorized valve, a bypass pressure regulator valve in the main compressor piping, check valves on the condenser outlets and speed control of the condenser fans. The condenser inlet motorized valves provide precise control of gas feed to the condensers, so pressure can build without collapsing the oil pressure. The condenser coil outlet contains inline check valves to prevent liquid backflow when a coil is isolated. The compressor discharge line contains a single motorized valve for regulating discharge pressure at start-up. The motorized valve in the compressor discharge piping also includes a bypass with a mechanical pressure regulator to allow precise regulation at the minimum discharge pressure. Once discharge pressure rises above the minimum setpoint, the condenser inlet solenoid coils will open one at a time. The discharge pressure regulating motorized valve will simultaneously regulate the discharge pressure until the condenser coil has warmed up enough to maintain discharge pressure.

Description

technical field [0001] The present invention relates to ammonia refrigeration systems. Background technique [0002] Air-cooled (non-evaporative) ammonia refrigeration systems are difficult to start in low ambient conditions. As the compressor discharges superheated vapor into the condenser, the cold condenser coil immediately condenses any vapor, preventing discharge pressure build-up. Screw compressors require a minimum pressure increase across the casing to maintain proper oil flow to the compressor components. Air-cooled condensers have too much surface area to build up a pressure increase on start-up due to very low ambient conditions (very large temperature differences). Chlorofluorocarbon refrigerant (CFC, HFC, HCFC) systems use isolation valves at the outlet of the condenser coil to force liquid back into the condenser, reducing the coil surface area available to condense vapor. However, this requires a significant amount of charge to be stored elsewhere in the sy...

Claims

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Application Information

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IPC IPC(8): F25B1/00F25B33/00F25B9/00F25B39/02F25D11/00F25D13/00
CPCF25B5/02F25B6/02F25B41/20F25B41/40F25B43/02F25B49/027F25B2400/0401F25B2400/13F25B2500/26F25B2600/0271F25B2600/2519
Inventor J·W·丹尼森D·L·汉密尔顿S·K·瓦因亚德
Owner EVAPCO