Betriebsanleitung_HF3_14_de.pdf - 第597页

10 2KE0041502 - englisch_BA 04.1 1.2010 ENGLISH 2 . DESCRIPTION OF THE PROCESS COOLER The process cooler is a unit ready for plug-in and is equipped with refrigeration and water circuits including all fittings and regula…

2KE0041502 - englisch_BA

04.11.2010

ENGLISH

1.5.2 Operation

The owner or the operator of the process cooler is obligated to establish emergency

practices (in the case of accidents and malfunctions). A short version of the operating

instructions must be drawn up by the operator – based on this present Operating Manual – and

made known to the employees.

The quick reference guide must be clearly legible and affixed in the immediate

vicinity of the process cooler.

See Sample Quick Reference Guide.

The owner or operator of a system is obligated to keep a logbook for the process

cooler.

The system logbook must either be available on site near the process cooler, or in the event

that the data are stored in a computer of the owner or operator, a printout of the log must be

kept in the vicinity of the process cooler. It must be ensured that these data are accessible to

qualified persons for the performance of repairs and requalification/repeat tests.

See Sample System Log

1.5.3 Repeat/Requalification Testing

To ensure compliance with minimum safety and health requirements as set forth in standard

EN 378, regular testing (requalification testing) of the process coolers is to be carried out by

competent persons.

The operator is responsible for the performance of the retests.

(See Chapter Repeat Testing).

1.6 Purpose of the Process Cooler

The process cooler described in this manual is designed exclusively for the cooling of water

within the specified operating temperature limits.

1. For Your Safety

2KE0041502 - englisch_BA

04.11.2010

ENGLISH

2. DESCRIPTION OF THE PROCESS COOLER

The process cooler is a unit ready for plug-in and is equipped with refrigeration and water

circuits including all fittings and regulating/control devices required for automatic operation.

The heat extracted from the water is given off to the ambient air via the refrigeration circuit – by

means of the fans.

2.1 Refrigeration Circuit

The refrigeration circuit is a closed-loop system in which the refrigerant circulates as the

working medium.

The water heated by the equipment to be cooled is re-cooled in the evaporator (3). The liquid

refrigerant is thereby passed through the piping in a counter-flow arrangement with respect to

the water. The refrigerant evaporates as it takes up the waste heat from the cooling water of the

equipment to be cooled.

The vaporised refrigerant is drawn in by the compressor (1) and is then compressed (rise in

pressure and temperature). The refrigerant also absorbs the heat of the compressor motor; this

heat is given off to the surrounding air by the condensers (2) - in the form of waste heat –by

means of the fan.

The refrigerant is thus liquefied and is passed to the inlet of the expansion valve (4) via the

liquid receiver, the shut-off valve, the filter drier and the sight glass. The expansion valve permits

liquid refrigerant to enter the evaporator as a function of the temperature.

The circuit is now complete.

Block flow diagram, refrigerant circuit

2. Description of the Process Cooler

2KE0041502 - englisch_BA

04.11.2010

ENGLISH

2.2 Water Circuit

(See also flow diagram of pipes and instruments)

2.2.1 Single Circuit System with Tank

The water circuit with its integrated tank is designed as a system open to the atmosphere. The

constancy of the water outlet temperature is governed by the water volume inside the tank. The

pump conveys the water out of the tank to the equipment to be cooled and back to the tank via

the evaporator.

2.3 Cooling Air Supply

The heat transferred to the evaporator upon cooling the water as well as the heat of the

compressor motors are absorbed by the refrigerant and given off to the cooling air in the

condenser.

As cooling air the ambient air is used which is drawn through the condenser by the fan(s),

warmed and then discharged in upward direction

It must be ensured that the cooling air can be drawn in and discharged without any

obstructions and adequate air changes for heat dissipation away from the installation

site of the process cooler take place.

(see also Section Installation)

2. Description of the Process Cooler