Figure 22-1 Evaporator sensible and latent capacity vs. entering air wet bulb

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Rosamund Rosalyn Stevenson
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1 Figure 22-1 Evaporator sensible and latent capacity vs. entering air wet bulb

2 Figure 22-2 Enthalpy change through the evaporator

3 Figure 22-3 Two aluminum domestic refrigeration evaporators

4 Figure 22-4 Commercial refrigeration evaporator for walk in cooler ( 2008 Heatcraft Refrigeration Products LLC.)

5 Figure 22-5 Large tonage chiller

6 Figure 22-6 Bare pipe evaporator coil with gravity air circulation

7 Figure 22-7 Plate-type evaporator (Courtesy Sporlan Valve Company)

8 Figure 22-8 Tube and fin evaporator (Courtesy Hampler Engineering Corporation)

9 Figure 22-9 Four styles of air conditioning coils, from top left clockwise, slab, slant, A, and M

10 Figure Three directions of airflow through an evaporator coil

Figure 22-11 Cross section of a tube in tube

11 Figure Cross section of a tube in tube evaporator, the water travels through the inside copper tube and the refrigerant travels through the steel tube in the opposite direction

12 Figure The water in the tank is cooled by the refrigerant in the tubing which is wrapped around the tank

13 Figure Direct expansion chiller; refrigerant tubes, water in the shell

14 Figure Refrigerant enters this DX evaporator at the bottom as a saturated liquid/vapor mixture and leaves at the top as a superheated vapor

15 Figure The evaporator tubing in this freezer also servers as the shelves (Courtesy of General Electric.)

16 Figure Roll-bond refrigerator evaporator (Courtesy of Bundy Refrigeration,

17 Figure Plate evaporator with tubes brazed to a galvanized plate

18 Figure Tube and fin coil construction

19 Figure Tubes are expanded into the fins to form a tight mechanical bond

Figure 22-20 Effect of a corrosive environment on a copper

20 Figure Effect of a corrosive environment on a copper tube, aluminum finned coil (Courtesy of Brog-Dlow Technologies)

21 Figure Ice bridging between fins on a tube and fin coil

22 Figure Comparison of fin spacing on coils for three different applications; the low temperature is on the left, medium temperature is in the middle, and air conditioning on the right

Figure 22-23 The grooves, or rifling, on the

creating turbulent flow from http://www.

23 Figure The grooves, or rifling, on the inside of this tubing increase heat transfer by creating turbulent flow from bde5c95b7010vgnvcm100000f932a8c0, by Michael Scholnick, Darratt- Callahan Co. (Courtesy of Garratt-Callahan Company)

24 Figure Multi-row coil used in commercial refrigeration application

25 Figure Slant evaporator used in a heat pump blower coil

26 Figure Air conditioning A coil

27 Figure Air conditioning M coil

28 Figure R-410a cooling capacities (Courtesy of Carrier 2008 Carrier Corporation.)

29 Figure Direct expansion evaporator coil showing counterflow airflow

Figure 22-30 The incline manometer is measuring 0.

30 Figure The incline manometer is measuring 0.15 in WC static pressure drop across the evaporator coil

Figure 22-31 Static pressure drop can be read using either a magnehelic gauge,

31 Figure Static pressure drop can be read using either a magnehelic gauge, shown on top, or an incline manometer, shown below; both are reading 0.17 in WC here

Figure 22-32 R-410a and R-22 coil static pressure drop

32 Figure R-410a and R-22 coil static pressure drop (in WC) (Courtesy of Carrier 2008 Carrier Corporation.)

33 Figure The sides of this drain pan slant in and toward the drain outlet to reduce the amount of standing water in the drain pan

Figure 22-34 Correct condensate drain line

34 Figure Correct condensate drain line piping includes a properly sized trap and clean outs

35 Figure Condensate disposal for a refrigerator

36 Figure Condensate disposal for window air conditioner

37 Figure Evaporator condensate pump

38 Figure Direct expansion coil, row, and face control

39 Figure Typical coil operating parameters for commercial refrigeration applications

40 Figure (a) Air defrost evaporator unit (Courtesy Toco Bueno); (b) The air moved over the coil during the off cycle melts the ice

Figure 22-41 Electric defrost evaporator unit: (a) End

resistance pan heater to prevent ice from forming during

41 Figure Electric defrost evaporator unit: (a) End cover removed; (b) Bottom cover removed; (c) Electric resistance pan heater to prevent ice from forming during the defrost cycle (Courtesy Hampden Engineering Corporation)

42 Figure Typical commercial refrigeration defrost timer

43 Figure Typical piping of hot gas defrost system using solenoid operated evaporator pressure regulating valves (Courtesy of Sporlan Division-Parker Hannifin Corporation.)

44 Figure Drain line heaters; (a) Wrong application; (b) Correct application (Courtesy of Kramer Refrigeration)

45 Figure Coaxial tube heat exchanger

46 Figure The highlighted area shows the evaporator in this water cooler (Courtesy of Elkay Manufacturing Company.)

47 Figure Roof mounted, air cooled packaged water chiller

Figure 22-48 Water is in the shell of this DX chiller; liquid

the water; the refrigerant is superheated before leaving the

48 Figure Water is in the shell of this DX chiller; liquid refrigerant flows through the tubes, which are submerged in the water; the refrigerant is superheated before leaving the chiller to prevent any liquid from returning to the compressor

49 Figure Liquid refrigerant is in the shell of this flooded chiller; the water flows through the tubes that are submerged in the liquid refrigerant; the eliminators prevent any liquid from returning to the compressor

50 Figure Packaged brine cooler

Figure 22-51 This certificate shows that these two pieces of

51 Figure This certificate shows that these two pieces of equipment will work properly together to give the results listed

Air-Cooling Evaporators

Air-Cooling Evaporators Types of construction Circuit Configurations Methods of Refrigerant Feed Methods of Air Circulation Methods of Defrost Type of Construction Bare tube Finned Tube Plate-surface Bare