ASHRAE Journal - August 2021 - 63

COLUMN ENGINEER'S NOTEBOOK
substantial space due to their associated heat exchangers,
laying out both options in our design modeling
software illustrated this advantage to a degree that our
visually inclined design team could appreciate (Figure 7
and Figure 8).
Case Study 2: Southern California Higher Education
Academic Instruction Building
The second example is a new-construction
100,000 gross ft2 (9000 gross m2) higher education academic
instruction building located in the inland region
of Southern California. This project required local heating
hot water and domestic hot water utility production
with a tie-in to a campus chilled water system that uses
thermal energy storage. As with Case Study 1, the author
served as a member of a design-build team to evaluate
various HVAC and plumbing design options to determine
the best-value solution based on merit. Figure 9
illustrates the baseline against which our proposed
approach, shown in Figure 10, was compared.
The baseline approach was developed according to
prescriptive requirements stipulated in the owner's RFP
package. This included the requirement to provide an
electric-powered utility plant that incorporates heat
pump technology to produce heating hot water and
domestic hot water utilities for the proposed building.
To provide enhanced value and performance to the
owner, our design-build team proposed, as part of our
baseline design approach, using heat-recovery chillers
in lieu of heat pumps to reduce load on the campus
chilled water infrastructure and improve energy
effi ciency.
In the baseline approach, heating hot water is produced
from a pair of modular heat-recovery chillers
sized to meet building heating demands combined with
a tie-in to the campus chilled water infrastructure to
accommodate peak cooling demands. Each heat-recovery
chiller module is furnished with a set of integral
automated isolation valves that are controlled by a factory
controller to modulate output and prevent bypass of
chilled and heating hot water through inactive modules
under normal operation. A single air-source heat pump
domestic water heater with a remote storage tank is provided
to meet the demand for domestic hot water.
The owner's RFP encouraged design-build teams to
consider and propose alternative design solutions based
on merit to the project and owner. Our team evaluated
design alternatives based on the four goals noted in Case
Study 1.
The integrated domestic water heater design approach
shown in Figure 10 yielded signifi cant advantages that our
design-build team and the owner found desirable. The
proposed approach consists of a single dual-source tanktype
water heater that uses the HVAC heating hot water
utility to preheat the domestic cold water from ~60°F
(~15.6°C) to ~110°F (~43.3°C) with auxiliary electric resistance
element heaters as the second heat source to lift
the water to its storage temperature of 140°F (60°C).
The heat-recovery chillers were initially sized to provide
an aggregate heating capacity of 1,307 MBtu/h
(373 kW) based on the selection of two equally sized
" 60 ton " modules to meet a design heating load of
1,041 MBtu/h (305 kW) during a design heating condition.
This yields an additional 266 MBtu/h (78 kW) of
" spare " capacity that enables consideration of the proposed
approach of integrating the domestic hot water
production.
YOUR DEFINITIVE COMPANION TO
STANDARD 62.1
Standard 62.1 User's Manual-Based on
ANSI/ASHRAE Standard 62.1-2019,
Ventilation for Acceptable Indoor Air Quality
Updated to align with the 2019 edition of ANSI/ASHRAE
Standard 62.1, this user's manual provides examples, sample
calculations, and best practices to aid users in designing,
installing, and operating systems for ventilation in buildings.
Features:
* Information on the intent and application of Standard 62.1
* Sample calculations and examples
* Best practices for applying the principles of good indoor air
quality (IAQ) and effective ventilation when designing buildings
and building systems
* Useful reference material
* Guidance for building operations and maintenance personnel
* Instructions in the application of tools used for compliance with
ANSI/ASHRAE Standard 62.1-2019
* Access to online 62MZCalc spreadsheets, updated for the
2019 edition
ashrae.org/62-1UM
A U G U S T 2 0 2 1 ashrae.org ASHRAE JOURNAL
63
http://www.ashrae.org/62-1UM http://www.ashrae.org

ASHRAE Journal - August 2021

Table of Contents for the Digital Edition of ASHRAE Journal - August 2021

Contents
ASHRAE Journal - August 2021 - Intro
ASHRAE Journal - August 2021 - Cover1
ASHRAE Journal - August 2021 - Cover2
ASHRAE Journal - August 2021 - 1
ASHRAE Journal - August 2021 - Contents
ASHRAE Journal - August 2021 - 3
ASHRAE Journal - August 2021 - 4
ASHRAE Journal - August 2021 - 5
ASHRAE Journal - August 2021 - 6
ASHRAE Journal - August 2021 - 7
ASHRAE Journal - August 2021 - 8
ASHRAE Journal - August 2021 - 9
ASHRAE Journal - August 2021 - 10
ASHRAE Journal - August 2021 - 11
ASHRAE Journal - August 2021 - 12
ASHRAE Journal - August 2021 - 13
ASHRAE Journal - August 2021 - 14
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ASHRAE Journal - August 2021 - 16
ASHRAE Journal - August 2021 - 17
ASHRAE Journal - August 2021 - 18
ASHRAE Journal - August 2021 - 19
ASHRAE Journal - August 2021 - 20
ASHRAE Journal - August 2021 - 21
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ASHRAE Journal - August 2021 - 26
ASHRAE Journal - August 2021 - 27
ASHRAE Journal - August 2021 - 28
ASHRAE Journal - August 2021 - 29
ASHRAE Journal - August 2021 - 30
ASHRAE Journal - August 2021 - 31
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ASHRAE Journal - August 2021 - 33
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ASHRAE Journal - August 2021 - 37
ASHRAE Journal - August 2021 - 38
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ASHRAE Journal - August 2021 - Cover3
ASHRAE Journal - August 2021 - Cover4
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