STM Products SCWR-D 1050-280 User Manual

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INDUSTRIAL & PROFESSIONAL

STM PRODUCTS s.r.l.

Via Schiaparelli, 15 | 37135 VERONA | ITALY |

WATER CHILLERS

Tel. [phone] | Fax [phone] |

[e-mail] | www.stm-products.com

TRADITIONAL WATER CHILLERS

DIRECT CHILLERS WITH COIL INSIDE THE TANK

They cannot reach 2°C
The cooling process is very slow
The tank is difficult to clean
There is a sanitation risk being the tank normally over-dimensioned
The output flow for a water delivery is slow being the pump installed
normally under-dimensioned
Normally they are controlled by a simple thermostat

INDIRECT CHILLERS WITH DOUBLE COIL INSIDE THE TANK

They can deliver water at 2°C only at the beginning, but soon after the
temperature increases considerably
The output flow for a water delivery is very slow

STM WATER CHILLERS

THE HIGH TECHNOLOGY ADVANTAGES

The temperature is constantly kept at 2°C inside the tank

The temperature remains constant during the whole water delivery

After the end of each water delivery, the new incoming water is cooled
again in few minutes therefore cool water will be available for the next batch

The evaporation process takes place inside a stainless steel plate heat
exchanger. The high efficiency of this device speeds up the water cooling
with the advantage of using not over-dimensioned tanks

The pump used for the water circulation through the heat exchanger is the
same that is used to feed the doser-mixer with the result of a high rate flow

The STM chillers are controlled with an STM microprocessor control board
with an LCD user interface

MACHINE CONCEPT

THERMODYNAMIC CIRCUIT

In the evaporator the refrigerant absorbes heat from the
water to be cooled
The vapour coming out from the evaporator is
compressed by the compressor increasing its
temperature
The overheated vapour enters into the condenser where
it transfers to the external ambient the heat absorbed
from the evaporator and compressor
The liquid coming out from the condenser is laminated
to low temperature by the thermostatic valve and returns
to the evaporator

WATER CIRCUIT

Cooling phase: the pump circulates the tank water
through the evaporator while the compressor is working
Delivery phase: the pump sends the water to the doser
Charging phase: at the end of a delivery, the charging
valve opens till the tank is full. At the same time the

cooling phase starts too. Thermostating phase: an hysteresis parameter controls the start of the
compressor to keep constant the tank temperature