LIQUID REFRIGERANT PUMPS

Where separate evaporators are used in low-temperature coldrooms, and blast freezers, for example, liquid pumps can be used to circulate refrigerant from the suction separator (or ‘ surge drum’), through the evaporator(s) and back. In the separator, remaining liquid falls back and is recirculated, while vapour goes to the compressor (see Figure 9.14). Liquid pumps are also used for spray

Suction

Slope

подпись: slopeWet return/suction ■*

Low-pressure

Accumulator

-separator

Liquid *

Evaporator

Evaporator

Evaporator

1

2

3

K Jl

-►———-

—— ►——

Pumped liquid supply main

LIQUID REFRIGERANT PUMPS

Liquid ►—

 

Refrigerant

Pump

подпись: refrigerant
pump
Figure 9.14 Pumped liquid circuit

Inlet Outlet

LIQUID REFRIGERANT PUMPS

Figure 9.15 Witt hermetic liquid refrigerant pump (Titan)

Chillers. (See Chapter 7). The liquid pump shown in Figure 9.15 has a strainer at inlet and a second mesh to prevent particles from entering the shaft drillings which feed liquid to the bearings. These pumps are used mainly for ammonia systems, and are also supplied for CO2.

Posted in Refrigeration and Air Conditioning