Horizon Absorption Series - Page 1

Introduction

What’s New

This catalog represents a redesign of Trane two-stage absorption chillers. This new Horizon design replaces our current Classic (ABTE) two-stage absorption chiller line. The following sizes are now available in the Horizon line:

The major differences between the Horizon two-stage chillers and the Classic two-stage chillers are as follows:

• Easily disassembled and reassembled into two or three pieces for those applications which require moving the machine through a smaller space.

• The energy valve is factory mounted.

• Variable speed drives on the absorber pump and low temperature generator pump provide improved part load efficiency and a larger operating map.

• Individual pumps are designed for 50,000 hour life between service points.

• Marine waterboxes on the absorber and condenser.

• Stainless steel tubes in the first stage generator.

Product Application Guide

There are many benefits to using the new high efficiency, reliable Horizon™ absorption chiller. These benefits include peak electrical shaving during high demand periods and replacement of existing lower efficiency single or two stage steam machines. Absorption chillers are environmentally friendly and offer smart controls, virtually eliminating the fear of crystallization which has plagued the industry in the past. Two-stage chillers can be applied to many building designs in all sections of the country and the world.

The Trane Horizon™ chillers are designed for comfort cooling or process applications when a continuous and reliable supply of 40 F to 50 F (+4.4 C - +10.0 C) chilled water is needed. Absorption chillers are normally applied where there is economic justification that supports lower operating costs. Their primary advantage is the ability to provide cooling using an available heat energy source. The machine operates with steam pressures up to 115 psig and hot water temperatures to 370 F (+187.8 C).

Combination Systems

Using a combination of electric chillers and absorption chillers for air conditioning loads, peak energy savings can be realized. The absorption chiller is used to shave seasonal billable peak power demands during summer operation, and the electric chiller is run below the allowed demand limit, reducing costly demand charges.

Trane not only has the ability to provide equipment for any type of building application but also has experienced applications engineers that can help with these designs. Trane offers both electric chillers and absorption chillers with the unit control panel (UCP2) as standard. This is an advantage because although the chillers have different features and modes of operation, the chiller control panel looks and acts the same across all chiller lines. Each control panel is programmed to monitor the particular chiller for which it was designed but maintenance and service personnel need only become familiar with one control panel.

Combined with a Trane Tracer^® system a chiller plant has almost unlimited operational flexibility and all equipment is supplied from a single source.

Multiple Machines

Trane two-stage absorption chillers modulate smoothly from light load to full load conditions automatically. This, combined with inherent reliability, often makes multiple machine installations unnecessary.

Multiple machine installations can be designed for parallel or series flow of chilled water through the machines. There are advantages to each design.

Parallel flow allows minimum chilled water pressure drop through the machines. However, with one machine "off", it is not usually possible to maintain design chilled water temperature unless one machine is valved off and the chilled water flow decreased.

Series flow permits design chilled water temperature at light loads with one machine "off." However, at all operating conditions, the chilled water pressure drop through the machines is high.

A decision concerning which arrangement is best for an individual system should be based on an analysis of system water and temperature rise requirements, system and machine pressure drop characteristics, and installation cost.

The control of multi-machine installations is discussed in the control section of this catalog. In multi- machine installations, as in single machine installations, provisions must be made to safeguard the machine from possible freeze-up in event of chilled water flow interruption.

^©American Standard Inc. 1998