Basic Documentation

Page 8 of 12 Siemens Industry, Inc.
Document No. 149-822
The following ASHRAE 90.1-2004 prescriptive
provisions are recommended for healthcare facility
ventilations systems:
 (6.5.1) Air handling units that provide cooling
must provide either an air or water economizer.
Air Economizer options are based on ASHRAE
climate zones.
 (6.5.3.2) VAV fan with motors 10 hp or larger
have one of the following: variable-speed drive,
vane-axial fan with variable-pitch blades or other
controls and devices that will reduce fan motor
demand.
 (6.5.3.2.3) VAV systems where DDC controls
zone terminal boxes reporting to a central
control panel, the static pressure shall be reset
based on zone requiring the most pressure. That
is, the set point is reset lower until one zone
damper is nearly wide open.
 (6.5.6) Exhaust air energy recovery is required
for air systems that have a supply air capacity of
5000 cfm or greater and have minimum outdoor
air supply of 70% or greater of the design supply
air quantity must have an energy recovery
system with at least 50% recovery effectiveness.
High-Efficiency Central Plants
(6.5.4) Energy consumption for central plants may
be reduced by the use of high-efficiency hydronic
system design and control strategies to reduce plant
energy consumption at full and part-loads (for
example, chillers with variable speed-drives,
primary-only variable flow pumping designs, series-
counter flow chiller design arrangements, etc.).
On-site Renewable Energy
The GGHC rating system awards a maximum of
three points (EA2) for On-Site Renewable Energy.
The U.S. Environmental Protection Agency (EPA)
website provides a complete listing of resources for
renewable energy programs at:
http://www.epa.gov/oaintrnt
/energy/renewtech.htm
A comprehensive source of information on state,
local, utility, and federal incentives that promote
renewable energy and energy efficiency can be
found at the following Web site:
http://www.dsireusa.org/Index.cfm?EE=1&RE=1
Solar Hot Water Systems
Solar hot water systems are a good renewable
energy source for healthcare facilities, due to their
high thermal loads. The use of heat-exchangers to
pre-heat domestic hot water, re-heat systems and
steam systems are all important strategies to energy
conservation. The solar hot water system can
provide hot water to power a small absorption chiller,
during the high-solar summer months.
Combined Heat and Power Systems
Combined heat and power (CHP) systems operate
on the heat generated from the facility and produce
electricity. These systems provide a source of
energy savings, but do not reduce the facility energy
consumption.
Measurement and Verification
The GGHC rating system awards a separate point
(EA 5) for Measurement and Verification (M&V). An
M&V Plan must be developed and implemented that
is consistent with the International Measurement &
Verification Protocol (IPMVP). This means that a
minimum of three years energy use in hospital must
be continuously measured. Metering must be
provided for electrical and mechanical systems such
as: Lighting Power Loads, Chillers, Data Centers,
Critical Electrical Distribution Systems, Air
Distribution Systems, and Motor Loads.
An open BAS provides the platform for integrating
data from different facility systems. Installation of
power meters and sub-meters allow energy usage to
be recorded, as well as equipment operational data
(flows, temperatures, etc.) to be logged, routine
analysis of data allows facility manager to
accomplish M&V goals.
Figure 5 shows an example energy dashboard that
provide
s healthcare facility and the public
information on the healthcare facilities sustainable
operations and programs.