Quantech QTC40160, Установка, эксплуатация и обслуживание

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Quantech
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Section 4 - Installation
Form QTC4-NM2
Issue date: 05/12/2023
Figure 13 - Suggested layout for applications with
a flow rate less than the evaporator
minimum allowable flow rate
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In applications where the required flow rate is greater
than the evaporator’s maximum allowable, the chilled
water can be recirculated to the load.
Thermal storage
Thermal storage is the practice of storing cooling
energy during a period of little or no load or low en-
ergy costs for use during periods of high load or en-
ergy costs. Conventional cooling systems produce
cooling when it is needed which is commonly dur-
ing times of peak demand. Thermal storage allows
generation of cooling capacity to occur during off-
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Figure 14 - Suggested layout for applications with
a flow rate greater than the evaporator
maximum allowable flow rate
peak periods and store that capacity to meet future
cooling requirements. Using thermal storage can result
in smaller equipment sizes, thereby reducing capital
cost, and also can result in significant energy cost sav-
ings.
The QTC4 has special control logic to be able to pro-
duce chilled leaving brine temperatures below 40°F
(4.4°C) so as to supply a storage tank with chilled liq-
uid during times of low demand. QTC4 chillers select-
ed for thermal storage operation can also be selected
to efficiently provide chilled fluid at nominal cooling
loads.
Variable primary flow
Quantech recommends a maximum 10% per minute
flow rate of change, based on design flow, for variable
primary flow applications. Provide 8 gal to 10 gal for
each chiller ton (8.6 L to 10.8 L per cooling KW) system
water volume. Insufficient system volume and rapid
flow changes can cause control problems or can even
cause chiller shutdowns. There are many other design
issues to evaluate with variable primary flow systems.
Consult your Quantech sales representative for more
information about successfully applying QTC4 chill-
ers.
Connection types and sizes
For connection sizes relevant to individual models see
Section 5 - Technical data.
Evaporator connections
Standard chilled liquid connections on evaporators are
of the grooved type for ASME and PED marked units
and flange type for GB marked units. See Figure 16 on
page 36
for flange dimensions on GB marked ves-
sels.
Figure 15 -
Grooved nozzle
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