5.9 Miscellaneous Energy Uses
Miscellaneous energy uses are defined as those that may be
treated separately since they have little or no interaction with the conditioned
thermal zones or the HVAC systems that serve them.
5.9.1
Water Heating
When the
construction documents show a water heating system, the layout and configuration
of the baseline building system shall be the same as the proposed design, e.g.
the baseline building shall have the same number of water heaters and the same
distribution system.
5.9.1.1 System Loads and
Configuration
|
Water Heating System Name |
|
Applicability |
All water heating
systems |
|
Definition |
A unique descriptor for
each water heating system.
A system consists of one
or more water heaters, a distribution system, an estimate of hot water
use, and a schedule for that use. Nonresidential buildings will typically
have multiple systems, perhaps a separate electric water heater for each
office break room, etc. Other building types such as hotels and hospitals
may have a single system serving the entire building. |
|
Units |
Text, unique |
|
Input
Restrictions |
Where applicable, this should match the tags that
are used on the plans such that a plan reviewer can make a
connection. |
|
Standard
Design |
The naming convention for
the baseline building system shall be similar to the proposed
design. |
|
Standard
Design:
Existing
Buildings |
|
|
Water Heating Peak Use |
|
Applicability |
All water heating
systems, required |
|
Definition |
An indication of the peak
hot water usage (e.g., service to sinks, showers, kitchen appliances,
etc.). When specified per occupant, this value is multiplied by design
occupancy density values and modified by service water heating schedules
to obtain hourly load values which are used in the simulation.
Peak consumption is
commonly specified as gallons per hour (gph) per occupant, dwelling unit,
hotel room, patient room, or floor area. If consumption is specified in
gph, then additional inputs would be needed such as supply temperature,
cold water inlet temperature, etc.
Software that specifies
peak use as a thermal load in Btu/h can apply ACM rules for the mains
(cold water inlet) temperature and supply temperature to convert the
prescribed peak use from gph/person to Btu/h-person. The thermal load does
not include conversion efficiencies of water heating
equipment. |
|
Units |
gph/person |
|
Input
Restrictions |
For nonresidential spaces, prescribed values from
Appendix
5.4A if a service hot water heating system is installed; otherwise,
all values are 0.
For high-rise residential spaces and residential
living spaces of hotels and motels (guestrooms), the rules in the
Residential ACM Reference Manual are followed. |
|
Standard
Design |
Prescribed values from Appendix
5.4A if a service hot water heating system is installed; otherwise,
all values are 0.
For high-rise residential
spaces and residential living spaces of hotels and motels (guestrooms),
the rules in the Residential ACM Reference Manual are
followed. |
|
Standard
Design:
Existing
Buildings |
|
|
Water Heating Schedule |
|
Applicability |
All water heating
systems |
|
Definition |
A fractional schedule
reflecting the time pattern of water heating use.
This input modifies the
water heating peak use described above. |
|
Units |
Data structure - schedule,
fractional |
|
Input
Restrictions |
The schedules from Appendix
5.4A shall be used. For high-rise residential spaces and residential
living spaces of hotels and motels (guestrooms), the rules in the
Residential ACM Reference Manual are followed. |
|
Standard
Design |
The schedules from Appendix
5.4A shall be used. For high-rise residential spaces and residential
living spaces of hotels and motels (guestrooms), the rules in the
Residential ACM Reference Manual are followed. |
|
Standard
Design:
Existing
Buildings |
|
|
Water Heating System
Configuration |
|
Applicability |
All water heating
systems |
|
Definition |
The configuration and
layout of the water heating system including the number of water heaters;
the size, location, length and insulation of distribution pipes;
recirculation systems and pumps; and any other details about the system
that would affect the energy model. |
|
Units |
Data structure |
|
Input
Restrictions |
None |
|
Standard
Design |
The baseline building
shall have one gas storage water heater, except for high-rise residential
buildings which shall follow the rules in the Residential ACM Reference
Manual. |
|
Standard
Design:
Existing
Buildings |
|
|
Water Mains Temperature
Schedule |
|
Applicability |
All water heating
systems |
|
Definition |
A monthly temperature
schedule indicating the water mains temperature.
This temperature and the
setpoint temperature are used to convert the load into a water flow
rate. |
|
Units |
Data structure - schedule,°F |
|
Input
Restrictions |
For nonresidential spaces, the schedules from Appendix
5.4A shall be used. The water mains temperature schedule shall be
fixed for a given climate zone.
For high-rise residential spaces and residential
living spaces of hotels and motels (guestrooms), the rules in the
Residential ACM Reference Manual are followed. |
|
Standard
Design |
For nonresidential
spaces, the schedules from Appendix
5.4A shall be used. The water mains temperature schedule shall be
fixed for a given climate zone.
For high-rise residential
spaces and residential living spaces of hotels and motels (guestrooms),
the rules in the Residential ACM Reference Manual *are
followed. |
|
Standard
Design:
Existing
Buildings |
|
5.9.1.2 Water Heaters
This section
describes the building descriptors for water heaters. Typically, a building will
have multiple water heating systems and each system can have multiple water
heaters, so these building descriptors may need to be specified more than once.
|
Water Heater Name |
|
Applicability |
All water
heaters |
|
Definition |
A unique descriptor for
each water heater in the system.
Some systems will have
multiple pieces of equipment. For instance, a series of water heaters
plumbed in parallel or a boiler with a separate storage
tank. |
|
Units |
Text, unique |
|
Input
Restrictions |
Where applicable, this should match the tags that
are used on the plans such that a plan reviewer can make a
connection. |
|
Standard
Design |
The naming convention for
the baseline building system shall be similar to the proposed
design. |
|
Standard
Design:
Existing
Buildings |
|
|
Water Heater Type and Size |
|
Applicability |
All water
heaters |
|
Definition |
This building descriptor
includes information needed to determine the criteria from baseline
standards. The choices and the associated rated capacity (heat input rate)
are listed in the 2015 Appliance Efficiency
Regulations, except that oil-fired water heaters and boilers are
not supported. |
|
Units |
List conventional, heat pump split, or heat pump
packaged |
|
Input
Restrictions |
As designed |
|
Standard
Design |
Gas storage water heater
for nonresidential buildings and common, nonresidential spaces of
high-rise residential buildings and hotel-motel guestrooms.
For high-rise residential
spaces and residential living spaces of hotels and motels (guestrooms),
the rules in the Residential ACM Reference Manual are
followed. |
|
Standard
Design:
Existing
Buildings |
Same as proposed if water heater is
existing |
|
Rated Capacity |
|
Applicability |
All water
heaters |
|
Definition |
The heating capacity of a
water heater (input rate) at the rated conditions specified in DOE 10 CFR
Part 430 or ANSI Z21.10 |
|
Units |
Thousands of British thermal units per hour
(MBH) |
|
Input
Restrictions |
As designed |
|
Standard
Design |
The standard design
capacity equals 60 percent of the total proposed design capacity (combined
rated capacity, converted to gph, and storage capacity in
gallons). |
|
Standard
Design:
Existing
Buildings |
|
|
Storage Volume |
|
Applicability |
Gas-fired water
heaters |
|
Definition |
The storage volume of a
gas-fired water heater used in the standby loss calculations and baseline
calculations of energy factor |
|
Units |
Gallons |
|
Input
Restrictions |
As designed |
|
Standard
Design |
The compliance software
shall size the storage tank to 40 percent of the proposed total rated
capacity and storage volume for the peak hour, in gallons.
For high-rise residential
spaces and residential living spaces of hotels and motels (guestrooms),
the rules in the Residential ACM Reference Manual are
followed. |
|
Standard
Design:
Existing
Buildings |
|
|
Input Power |
|
Applicability |
Heat pump water
heaters |
|
Definition |
The total design
electrical input to a heat pump water heater at design
conditions.
This power includes the
input to the compressor, controls, evaporator fan, and pump (if
present). |
|
Units |
Kilowatts (kW) |
|
Input
Restrictions |
As designed |
|
Standard
Design |
Not
applicable |
|
Standard
Design:
Existing
Buildings |
|
|
Storage Tank Location |
|
Applicability |
Heat pump water
heaters |
|
Definition |
The storage volume of a
gas-fired water heater. This is used in the standby loss calculations and
baseline calculations of energy factor. |
|
Units |
List:
•
Conditioned
•
Unconditioned
|
|
Input
Restrictions |
List see above |
|
Standard
Design |
|
|
Standard
Design:
Existing
Buildings |
|
|
Energy
Factor |
|
Applicability |
Equipment covered by the
National Appliance Energy Conservation Act (NAECA), which includes small
storage and instantaneous water heaters |
|
Definition |
The energy factor (EF) is
the ratio of the energy delivered by the water heater divided by the
energy used, in the same units. EF is calculated according to the DOE 10
CFR Part 430 test procedure, which specifies a 24-hour pattern of draws, a
storage temperature, inlet water temperature, and other test conditions.
These conditions result in the energy delivered for the test period.
Energy inputs are measured for the same test period and the EF ratio is
calculated. |
|
Units |
Unitless ratio |
|
Input
Restrictions |
Building descriptors for the proposed design
should be consistent with equipment specified on the construction
documents or observed in the candidate building.
For water heaters manufactured after June 1, 2017
that contain a Uniform Energy Factor, the EF shall not be input by the
user, but shall be calculated by:
Where:
|
|
Energy
Factor |
|
|
Recovery
Efficiency |
|
|
Power Input
(W) |
|
|
UEF |
|
|
Recovery efficiency
defined as 0.80 for storage water heater UEF to EF
conversion |
|
Draw Pattern |
a |
b |
c |
d |
|
Very Small |
0.250266 |
57.5 |
0.039864 |
67.5 |
|
Low |
0.065860 |
57.5 |
0.039864 |
67.5 |
|
Medium |
0.045503 |
57.5 |
0.039864 |
67.5 |
|
High |
0.029794 |
57.5 |
0.039864 |
67.5 |
|
|
Standard
Design |
For nonresidential
buildings and nonresidential spaces, the EF for the baseline building
system shall be determined from the Appliance Efficiency
Regulations.
For high-rise residential
spaces and residential living spaces of hotels and motels (guestrooms),
the rules in the Residential ACM Reference Manual are
followed. |
|
Standard
Design:
Existing
Buildings |
|
|
Uniform Energy Factor |
|
Applicability |
Equipment covered by
NAECA that is rated after June 1, 2017 with a Uniform Energy Factor (UEF)
that includes small storage and instantaneous water
heaters |
|
Definition |
The UEF defines an
efficiency level for a specific targeted use pattern |
|
Units |
Unitless ratio |
|
Input
Restrictions |
Must meet mandatory minimum requirements defined
by federal or state appliance efficiency standards |
|
Standard
Design |
Not
applicable |
|
Standard
Design:
Existing
Buildings |
|
|
First Hour Rating |
|
Applicability |
Water heating storage
tanks with a UEF rating |
|
Definition |
The first hour rating is
a measure of the overall capacity of the water heater that incorporates
both the heat input rate and the tank storage capacity and is used to
determine the draw pattern. |
|
Units |
gal/hr |
|
Input
Restrictions |
As designed |
|
Standard
Design |
Not
applicable |
|
Standard
Design:
Existing
Buildings |
|
|
Draw Pattern |
|
Applicability |
Storage water heating
tanks with a UEF rating |
|
Definition |
The draw pattern is
determined as: very small, low, medium, or high from the user entry of
first hour rating (FHR).
Very small: 0-18
gal/hr
Low: 18-51
gal/hr
Medium: 51-75
gal/hr
High: > 75
gal/hr |
|
Units |
List:
•
Very small
•
Low
•
Medium
•
High |
|
Input
Restrictions |
Not user editable. Draw pattern is determined from
FHR user input. |
|
Standard
Design |
Not
applicable |
|
Standard
Design:
Existing
Buildings |
|
|
Thermal Efficiency |
|
Applicability |
Oil and gas-fired water
heaters not covered by NAECA |
|
Definition |
The full load efficiency
of a water heater at rated conditions expressed as a dimensionless ratio
of output over input. It is also referred to as recovery
efficiency. |
|
Units |
Unitless ratio |
|
Input
Restrictions |
Building descriptors for the proposed design
should be consistent with equipment specified on the construction
documents or observed in the candidate building. |
|
Standard
Design |
For nonresidential
buildings and nonresidential spaces, the thermal efficiency is determined
from Table F-2 in the 2015 Appliance Efficiency
Regulations.
For high-rise residential
spaces and residential living spaces of hotels and motels (guestrooms),
the rules in the Residential ACM Reference Manual are
followed. |
|
Standard
Design:
Existing
Buildings |
|
Baseline efficiency is set from
the Appliance Efficiency Regulations
|
Tank Standby Loss |
|
Applicability |
Water heaters not covered
by NAECA |
|
Definition |
The tank standby loss for
storage tanks, which includes the effect of recovery
efficiency |
|
Units |
Btu/h for the entire tank |
|
Input
Restrictions |
Standby loss is calculated as:
Where:
|
|
The standby loss fraction listed in the
Energy Commission’s Appliance Database of Certified Water
Heaters |
|
|
The actual storage capacity of the water
heater as listed in the Energy Commission’s Appliance Database of
Certified Water Heaters (gallons) |
|
|
Standard
Design |
Table F-2 of the 2015
Appliance Efficiency Standards |
|
Standard
Design:
Existing
Buildings |
|
|
Tank Off-Cycle Loss
Coefficient |
|
Applicability |
Water
heaters |
|
Definition |
The tank standby loss
coefficient (UA) for the water heater.
For small water heaters
covered by NAECA, the loss coefficient is a derived parameter, a function
of the EF and recovery efficiency. |
|
Units |
Btu/h - °F |
|
Input
Restrictions |
For NAECA covered water heaters, the loss
coefficient is calculated by:
Where:
|
|
The energy factor of the rated water heater
(unitless) |
|
|
The recovery efficiency of the rated water
heater. If this data is not available the default shall be 0.78 for
gas water heaters and 0.93 for electric water
heaters. |
|
|
The input power to the water heater, in
Btu/h |
|
|
Standard
Design |
For nonresidential spaces, 10 Btu/h-F. For
high-rise residential spaces and residential living spaces of hotels and
motels (guestrooms), the rules in the Residential ACM Reference Manual are
followed |
|
Standard
Design:
Existing
Buildings |
|
The baseline loss coefficient for
NAECA water heaters shall be:
10 Btu/h-F for gas-fired water
heaters
|
Off Cycle Parasitic Losses |
|
Applicability |
Water
heaters |
|
Definition |
The rate of parasitic
losses, such as a pilot light or controls, when the water heater is not
heating |
|
Units |
Watts |
|
Input
Restrictions |
As designed |
|
Standard
Design |
0 |
|
Standard
Design:
Existing
Buildings |
|
|
Off Cycle Fuel Type |
|
Applicability |
Water
heaters |
|
Definition |
The type of fuel that
serves energy using parasitic equipment, such as a pilot light or
controls, when the water heater is not heating |
|
Units |
List electricity, gas, oil, or
propane |
|
Input
Restrictions |
As designed |
|
Standard
Design |
Not
applicable |
|
Standard
Design:
Existing
Buildings |
|
Not applicable
|
On-Cycle Parasitic Losses |
|
Applicability |
Water
heaters |
|
Definition |
The rate of parasitic
losses, such as a pilot light or controls, when the water heater is not
heating. It may be different than off-cycle losses if the flue energy is
considered. |
|
Units |
Watts |
|
Input
Restrictions |
As designed |
|
Standard
Design |
Not
applicable |
|
Standard
Design:
Existing
Buildings |
|
0
|
On-Cycle Fuel Type |
|
Applicability |
Water
heaters |
|
Definition |
The type of fuel that
serves energy using parasitic equipment, such as a pilot light or
controls, when the water heater is not heating |
|
Units |
List electricity, gas, oil, or
propane |
|
Input
Restrictions |
As designed |
|
Standard
Design |
Not
applicable |
|
Standard
Design:
Existing
Buildings |
|
|
Water Heater Ambient Location |
|
Applicability |
Water
heaters |
|
Definition |
The location of the water
heater for determining losses and energy interaction with the
surroundings |
|
Units |
List schedule, zone, outdoors |
|
Input
Restrictions |
As designed |
|
Standard
Design |
Not
applicable |
|
Standard
Design:
Existing
Buildings |
|
|
Water Heater Compressor
Location |
|
Applicability |
Heat pump water
heaters |
|
Definition |
The location of the heat
pump compressor for determining losses and energy interaction with the
surroundings.
The air temperature at
the compressor location also controls the compressor’s crankcase heater
operation. |
|
Units |
List zone, outdoors |
|
Input
Restrictions |
As designed |
|
Standard
Design |
Not
applicable |
|
Standard
Design:
Existing
Buildings |
|
Zone
|
Tank Standby Loss Fraction |
|
Applicability |
Storage tank water
heaters |
|
Definition |
The tank standby loss
fraction for storage tanks |
|
Units |
Unitless |
|
Input
Restrictions |
Prescribed to the value listed in the Appliance
Database of Certified Water Heaters |
|
Standard
Design |
Not applicable
The part-load curve
procedure in Title 24 can be an alternate method of specifying the effects
of standby and parasitic losses on performance. The primary method is to
specify a loss coefficient for the storage tank. |
|
Standard
Design:
Existing
Buildings |
|
|
Fuel Water Heater Part-Load Efficiency
Curve |
|
Applicability |
Water heating equipment
for which a loss coefficient is not specified (alternate
method) |
|
Definition |
A set of factors that
adjust the full-load thermal efficiency for part load conditions; set as a
curve |
|
Units |
Percent (%) |
|
Input
Restrictions |
The following prescribed curve shall be used based
on user inputs. The curve shall take the form of a quadratic equation as
follows:
For Title 24, the coefficients shall be determined
by:
Recovery efficiency substituted with thermal
efficiency when applicable.
For boilers, instantaneous gas or other storage
type water heaters, not in the scope of covered consumer products as
defined in the Title 10 or the Code of Federal Regulations, Part
430:
Required inputs and standard and proposed design
assumptions depend on the type of water heater and whether or not it is a
DOE covered consumer product.
Where:
|
|
The fuel heating part load efficiency
curve |
|
|
The fuel consumption at part-load conditions
(Btu/h) |
|
|
The fuel consumption at design conditions
(Btu/h) |
|
|
The water heater capacity at part-load
conditions (Btu/h) |
|
|
The water heater capacity at design
conditions (Btu/h) |
|
|
Part-load ratio for the nth hour
and shall always be less than 1 |
|
|
The input capacity of the water heater
expressed in Btu/hr |
|
|
Hourly standby loss expressed in Btu/hr. For
large storage gas water heaters, STBY is listed in the Energy
Commission’s appliance database. The value includes pilot energy and
standby losses. For all systems, refer to equation
N2-62. |
|
|
The standard recovery load, taken from Appendix
5.4A, in Btu/hr, adjusted for the number of occupants according
to the occupancy schedules. |
|
|
The standby loss fraction listed in the
Energy Commission’s Appliance Database of Certified Water
Heaters |
|
|
The actual storage capacity of the water
heater as listed in the Appliance Database of Certified Water
Heaters |
|
|
Standard
Design |
Not
applicable |
|
Standard
Design:
Existing
Buildings |
|
5.9.1.3 Recirculation Systems
This section
describes the building descriptors for hot water recirculation systems. The
baseline building has a recirculation system when the proposed design does. This
is one aspect of the water heating system configuration (see above).
Recirculating
systems shall follow the rules set forth in Appendix E of the Residential ACM
Manual.
5.9.1.4 Water Heating Auxiliaries
|
External Storage Tank
Insulation |
|
Applicability |
All water heating systems
that have an external storage tank |
|
Definition |
Some water heating
systems have a storage tank that is separate from the water heater(s) that
provides additional storage capacity. This building descriptor addresses
the heat loss related to the external tank, which is an additional load
that must be satisfied by the water heater(s). |
|
Units |
R-value (h-ft2-F/Btu) |
|
Input
Restrictions |
As specified in manufacturer data and documented
on the construction documents |
|
Standard
Design |
Heat loss associated with
the storage tank in the baseline building shall meet the requirements for
an unfired storage tank in the baseline standards which is an insulation
R-value of 12.5. The surface area and location of the storage tank shall
be the same as the proposed design. |
|
Standard
Design:
Existing
Buildings |
|
|
External Storage Tank Area |
|
Applicability |
All water heating systems
that have an external storage tank |
|
Definition |
Some water heating
systems have a storage tank that is separate from the water heater(s) that
provides additional storage capacity. This documents the entire exterior
surface area of the tank. |
|
Units |
ft2 |
|
Input
Restrictions |
As specified in manufacturer
specifications |
|
Standard
Design |
Not
applicable |
|
Standard
Design:
Existing
Buildings |
|
|
External Storage Tank
Location |
|
Applicability |
All water heating systems
that have an external storage tank |
|
Definition |
Location of the storage
tank, used to determine the heat loss rate and energy exchange with the
surroundings |
|
Units |
List schedule, zone, outdoors |
|
Input
Restrictions |
As designed |
|
Standard
Design |
Not
applicable |
|
Standard
Design:
Existing
Buildings |
|
|
Heat Recovery |
|
Applicability |
Water heating systems
that are coupled to heat recovery equipment |
|
Definition |
Building equipment such
as air conditioners, chillers, and gas-fired generators that produce
thermal energy that may be recovered and used to heat water. The
heat-producing characteristics are generally defined for the equipment
that is producing the heat, not the equipment that is receiving the heat
(water heaters in this case). The building descriptors will vary depending
on the equipment. The models for heat-producing equipment need to produce
output on an hourly basis so that the schedule of heat production and
heating needs can be aligned and evaluated in the water heating
model. |
|
Units |
Data structure - depends on the equipment
producing the heat |
|
Input
Restrictions |
No restrictions, other than agreement with the
construction documents |
|
Standard
Design |
Not
applicable |
|
Standard
Design:
Existing
Buildings |
|
|
Solar Thermal |
|
Applicability |
Water heating systems
with a solar thermal system |
|
Definition |
A solar thermal water
heating system consists of one or more collectors. Water is passed through
these collectors and is heated under the right conditions. There are two
general types of solar water heaters: integrated collector storage (ICS)
systems and active systems. Active systems include pumps to circulate the
water, storage tanks, piping, and controls. ICS systems generally have no
pumps and piping is minimal.
Solar systems may be
tested and rated as a complete system or the collectors may be separately
tested and rated. Solar Rating & Certification Corporation (SRCC)
OG-300 is the test procedure for whole systems and SRCC OG-100 is the test
procedure for collectors. The building descriptors used to define the
solar thermal system may vary with each software application and with the
details of system design.
The solar fraction shall
be estimated by the f-chart procedure for solar water heating
systems. |
|
Units |
Unitless fraction |
|
Input
Restrictions |
The solar fraction provided by the solar DHW
system shall be between 0 and 1. |
|
Standard
Design |
The baseline building has
no solar auxiliary system. |
|
Standard
Design:
Existing
Buildings |
|
|
Combined Space Heating and Water
Heating |
|
Applicability |
Projects that use a
boiler to provide both space heat and water heating |
|
Definition |
A system that provides
both space heating and water heating from the same equipment, generally
the space heating boiler. Such systems are restricted by the baseline
standards but may be modeled in the candidate building. The restrictions
are due to the misalignment of the space heating load and the water
heating load. The first is highly intermittent and weather dependent, and
the latter is more constant and not generally
weather-related. |
|
Units |
Data structure |
|
Input
Restrictions |
The proposed design may have a combined space and
water heating system. |
|
Standard
Design |
The baseline building
shall be modeled with separate space heating and water heating
systems. |
|
Standard
Design:
Existing
Buildings |
|
5.9.2
Exterior Lighting
Outdoor lighting
requirements are specified in Section 140.7 of the
standards. Outdoor lighting shall not be modeled in the proposed design or
standard design, and no tradeoffs are available with other building end uses or
systems. Outdoor lighting shall meet all prescriptive requirements in the
standards.
5.9.3
Swimming Pools
Swimming pools
must meet applicable mandatory requirements and are not required to be modeled
for Title 24 compliance or reach.
5.9.4
Other Electricity Use
This set of
building descriptors should be used to include any miscellaneous electricity use
that would add to the electric load of the building and would be on the building
meter. These energy uses are assumed to be outside the building envelope and do
not contribute heat gain to any thermal zone.
|
Miscellaneous Electric Power |
|
Applicability |
All buildings with
miscellaneous electric equipment located on the building
site |
|
Definition |
The power for
miscellaneous equipment |
|
Units |
Watts (W) |
|
Input
Restrictions |
As designed |
|
Standard
Design |
Same as the proposed
design |
|
Standard
Design:
Existing
Buildings |
|
|
Miscellaneous Electric
Schedule |
|
Applicability |
All buildings with
miscellaneous electric equipment located on the building
site |
|
Definition |
The schedule of operation
for miscellaneous electric equipment that is used to convert electric
power to energy use |
|
Units |
Data structure - schedule,
fractional |
|
Input
Restrictions |
The schedule specified for the building should
match the operation patterns of the system. |
|
Standard
Design |
Same as the proposed
design |
|
Standard
Design:
Existing
Buildings |
|
5.9.5
Other Gas Use
This set of
building descriptors should be used to include any miscellaneous gas use that
would add to the load of the building and would be on the building meter. These
energy uses are assumed to be outside the building envelope and do not
contribute heat gain to any thermal zone.
|
Other Gas Power |
|
Applicability |
All buildings that have
commercial gas equipment |
|
Definition |
Gas power is the peak
power which is modified by the schedule (see below). |
|
Units |
Btu/h-ft² |
|
Input
Restrictions |
As designed |
|
Standard
Design |
Same as the proposed
design |
|
Standard
Design:
Existing
Buildings |
|
|
Other Gas Schedule |
|
Applicability |
All buildings that have
commercial gas equipment |
|
Definition |
The schedule of operation
for commercial gas equipment that is used to convert gas power to energy
use |
|
Units |
Data structure - schedule,
fractional |
|
Input
Restrictions |
Continuous operation is
prescribed |
|
Standard
Design |
Same as the proposed
design |
|
Standard
Design:
Existing
Buildings |
|