Specifications

12 Catalog WSC/WDC-4
Heat Recovery Models
For decades, McQuay International has pioneered the use of heat recovery chillers and the unique
McQuay Templifier™ Heat Pump Water Heater to reduce energy costs. These products have
become more important than ever with the current emphasis on total building efficiency.
ASHRAE Efficiency Standard 90.1 mandates the use of heat recovery equipment of this type in a
wide range of buildings.
Heat Recovery Chillers
The heat recovery chillers, Models HSC with a single
compressor, have a single condenser with split bundles, i.e.,
two separate water passages divided by separate water heads
as shown in the photograph to the right. The inboard water
connections are connected to the cooling tower, the other
water side is connected to the heating system.
The economic feasibility of hot water generated with these
units depends on heating and cooling load profiles and on
the relative cost of the available energy sources. A
compressor’s kw per ton is heavily influenced by the
pressure head it is pumping against. During heat recovery
operation, all of the cooling load is operating against the
high head required by the hot water temperature. For this
reason, it is desirable to maximize the percentage of the total
rejected heat used for the heating load.
McQuay’s economic evaluation program, Energy Analyzer™, available on CD from your local
McQuay sales office, is the perfect tool to determine the economic feasibility of using this proven
technology.
Figure 2, Heat Recovery Chiller Piping Schematic
EVAPORATOR
TOWER
CONDENSER
RECOVERY
CONDENSER
A
UXILIARY
HEATER
HEAT LOAD
TC
TC
COOLING
LOAD
OPEN
CIRCUIT
TOWER
HEAT RECOVERY
CHILLER
LEGEND
TC TEMPERATURE CONTROL POINT
PUMP