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PowerPoint ® Presentation Chapter 6 Refrigeration Systems Refrigeration Mechanical Compression Refrigeration Absorption Systems Troubleshooting and Maintaining.

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Presentation on theme: "PowerPoint ® Presentation Chapter 6 Refrigeration Systems Refrigeration Mechanical Compression Refrigeration Absorption Systems Troubleshooting and Maintaining."— Presentation transcript:

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2 PowerPoint ® Presentation Chapter 6 Refrigeration Systems Refrigeration Mechanical Compression Refrigeration Absorption Systems Troubleshooting and Maintaining Refrigeration Systems Refrigerant Regulations Refrigerant Handling

3 Chapter 6 Refrigeration Systems A refrigeration system controls the absorption and rejection of heat by refrigerant to move heat from inside a cooled space to outside the cooled space.

4 Chapter 6 Refrigeration Systems In a mechanical compression refrigeration system, a compressor is used to produce the refrigeration effect.

5 Chapter 6 Refrigeration Systems Refrigerant vapor pressure charts list the saturation temperature and pressure of refrigerants.

6 Chapter 6 Refrigeration Systems Refrigeration compressors include reciprocating, vane, centrifugal, and screw compressors.

7 Chapter 6 Refrigeration Systems Refrigerant compressors are available in hermetic and semi-hermetic configurations.

8 Chapter 6 Refrigeration Systems An air-cooled condenser removes heat from high- pressure refrigerant vapor by air blown across the condenser coils.

9 Chapter 6 Refrigeration Systems Water-cooled condensers transfer heat from refrigerant vapor to water.

10 Chapter 6 Refrigeration Systems Evaporative condensers reject heat through the evaporation of water.

11 Chapter 6 Refrigeration Systems A fin comb is used for condenser maintenance to straighten damaged or bent fins, which limit airflow and reduce condenser efficiency. Robinair Division, SPX Corporation

12 Chapter 6 Refrigeration Systems A thermostatic expansion valve uses temperature readings at the evaporator outlet to control the rate of refrigerant flow into the evaporator.

13 Chapter 6 Refrigeration Systems The opening and closing of a thermostatic expansion valve is controlled by the pressure in the remote bulb.

14 Chapter 6 Refrigeration Systems An automatic expansion valve controls the temperature of the refrigerant by controlling the pressure in the evaporator.

15 Chapter 6 Refrigeration Systems As refrigerant is forced through the capillary tube, it loses pressure until it is at the desired evaporator pressure.

16 Chapter 6 Refrigeration Systems An evaporator vaporizes low-pressure refrigerant liquid into a low-pressure vapor.

17 Chapter 6 Refrigeration Systems A hot-gas defrost uses hot gas from the compressor to melt frost on the evaporator.

18 Chapter 6 Refrigeration Systems An evaporator pressure regulating valve allows two evaporators running from the same compressor to maintain different temperatures.

19 Chapter 6 Refrigeration Systems Accessories are used for maintaining and controlling the flow of refrigerant in a refrigeration system.

20 Chapter 6 Refrigeration Systems Pressure switches control refrigeration system temperature through changes in system pressure. Ranco Inc.

21 Chapter 6 Refrigeration Systems Ammonia systems operate at high temperatures and pressures and must have special controls and fittings to control the release of ammonia gas.

22 Chapter 6 Refrigeration Systems The direction of refrigerant flow in a heat pump is controlled by a reversing valve.

23 Chapter 6 Refrigeration Systems Heat pumps may use air or water as the heat source.

24 Chapter 6 Refrigeration Systems Chillers use chilled water to cool large building spaces.

25 Chapter 6 Refrigeration Systems A cooling tower cools water from a condenser by the evaporation of water as it cascades through the tower.

26 Chapter 6 Refrigeration Systems Absorption systems use a generator and absorber in place of the compressor to raise system pressure.

27 Chapter 6 Refrigeration Systems Gauge manifolds are used to take pressure readings, add or remove refrigerant, and remove air from a system before it is filled with refrigerant.

28 Chapter 6 Refrigeration Systems Service valves are front- seated for isolating parts of the system, mid- seated for adding or removing refrigerant or taking system pressures, and back-seated during normal operation.

29 Chapter 6 Refrigeration Systems Refrigeration system pressure readings are taken by connecting the blue hose to the low-pressure side service valve and the red hose to the high-pressure side service valve with both gauge manifold valves front-seated.

30 Chapter 6 Refrigeration Systems A head pressure controller prevents the condenser pressure from falling too low and starving the evaporator for refrigerant.

31 Chapter 6 Refrigeration Systems The EPA has established regulations under Section 608 of the Clean Air Act to regulate the handling of ozone-depleting substances.

32 Chapter 6 Refrigeration Systems A recovery unit is used to recover refrigerant for reuse.

33 Chapter 6 Refrigeration Systems A leak detector is a device used to detect refrigerant leaks in air conditioning or refrigeration systems.

34 Chapter 6 Refrigeration Systems A vacuum pump removes all air from a refrigeration system.

35 Chapter 6 Refrigeration Systems The vacuum pump is connected to the system service valves using a gauge manifold and hoses.

36 Chapter 6 Refrigeration Systems Electronic leak detectors are extremely sensitive and indicate the general location of a leak.

37 Chapter 6 Refrigeration Systems The refrigerant container is placed upside down to charge with liquid and right side up to charge with vapor.


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