Browse Prior Art Database

Chiller Flow Control Method

IP.com Disclosure Number: IPCOM000104405D
Original Publication Date: 1993-Apr-01
Included in the Prior Art Database: 2005-Mar-19
Document File: 4 page(s) / 61K

Publishing Venue

IBM

Related People

Harasono, Y: AUTHOR [+4]

Abstract

Disclosed is a chiller flow control method for operating chiller efficiently and stabilizing the system supply temperature.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 100% of the total text.

Chiller Flow Control Method

      Disclosed is a chiller flow control method for operating
chiller efficiently and stabilizing the system supply temperature.

      Fig. 1 shows the conventional system configuration.  If the
temperature difference between supply and return chiller water is
smaller than the design figure or water demand is larger than chiller
flow, bypass flow occurs and causes unstable supply temperature.  In
addition, chiller capacity becomes smaller than the rated capacity,
because chiller flow is constant.

      To solve the above problems, two-way control valve is provided
at the inlet of chiller to control its flow.  Chiller flow is
automatically changed in compliance with the deviation from the set
point of system outlet temperature as shown in Fig. 2.

      Control range of chiller flow is determined considering the
velocity in heat exchange tubes of chiller evaporator.  The maximum
chiller flow should be under the velocity occurring turbulent flow or
tube erosion.  On the other hand, the minimum chiller flow should be
over the velocity starting tube freezing (Fig. 3).

      As a result, chiller capacity can be highly utilized and supply
temperature can be far stable.