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Published in Samuel C. Sugarman, HVAC Fundamentals, 2020
chiller: (Refrigeration) A chiller (aka water chiller or water cooler) is a machine that removes heat from a water using a vapor-compression (mechanical chiller) or absorption (absorption chiller) refrigeration cycle. The water may contain glycol and corrosion inhibitors. In air conditioning systems, chilled water is distributed to heat exchangers, or cooling coils, in air handling units. The cooling coils transfer sensible heat and latent heat from the air to the chilled water cooling and usually dehumidifying the air stream. The warmed water is returned to the chiller for cooling. Chilled water is used to cool and dehumidify air in mid- to large-size commercial, industrial, and institutional facilities. A typical chiller for air conditioning applications is rated between 15 to 1500 tons (180,000 to 18,000,000 British thermal units) in cooling capacity. See mechanical chiller.
Refrigeration Systems and Components
Published in Herbert W. Stanford, Adam F. Spach, Analysis and Design of Heating, Ventilating, and Air-Conditioning Systems, 2019
Herbert W. Stanford, Adam F. Spach
The warmer return chilled water enters the water chiller where it is cooled to the desired chilled water supply temperature by transferring the heat extracted from the building spaces to a primary refrigerant. This process, obviously, is not “free” since the compressor must do work on the refrigerant for cooling to occur and, thus, must consume energy in the process. Since most chillers are refrigerant-cooled, the compressor energy, in the form of heat, is added to the building heat and both must be rejected through the condenser.
Thermal performance of a single stage double inlet pulse tube refrigerator: experimental investigation and CFD simulation
Published in Experimental Heat Transfer, 2022
K.N. Sai Manoj, S. Anbarasu, S. Ghosh, S.K. Sarangi
The regenerator and cold heat exchanger (cold end) are associated with a soft copper U-tube. The minimum temperature obtained at the cold end exchange heat with the object desired to be cooled. The copper screen size 40 × 40 mesh/inch and wire diameter 0.254 mm is added inside the cold end to endure homogeneity in the temperature. The pulse tube is a cylindrical stainless steel tube used to carry the heat and cold of the refrigerant. The heat from the refrigerant is eliminated by the hot heat exchanger and it is cooled by a continuous stream of cold water from the water chiller to maintain ambient temperature. Through the orifice valve, the hot heat exchanger is connected to the reservoir. The pressure fluctuations in the system are stabilized by the reservoir. The double inlet valve reduces the gas stream in the regenerator and maintains the phase of flow in the duct. The double inlet and orifice valves are very vital to attain minimum temperature by providing a better phase relation between the flow rate and pressure. The valves are highly accurate and have a huge opening to ease the flow in the conduits. The valve coefficient is selected based on the working fluid, operating pressure, and temperature conditions. The specifications of the components are listed in table 1.