Version 2.6

Term	Term Definition	Options	Unit of Measure
Demand Ratchet Percentage	Certain rate schedules incorporate demand ratchet percentage to ensure minimum billing demands based on historical peak demands. Billing demand in these cases is based comparing the month's demand and maximum of previous 11 month's demand times the demand ratchet percentage	View	percent
Demand response	Load shedding initiated by the energy provider	View	None
Demand response or load management program incentive	These are programs that provide incentives to curtail demand during peak energy usage periods in response to system reliability or market conditions. Agencies can participate in state and utility incentive programs in order to reduce their energy usage and control their energy costs.	View	None
Demand Response Participation	Demand response participation requires changes in electric usage by end-use customers from their normal consumption patterns in response to changes in the price of electricity over time, or to incentive payments designed to induce lower electricity use at times of high wholesale market prices or when system reliability is jeopardized.	View	None
Demand window		View	None
Density	Mass per unit volume.	View	lbs/ft3
Department	Common unit abbreviation: Dept	View	None
Department of Buildings (DOB) Approved Agent		View	None
Depressurization	Blower door depressurization test	View	None
Depth	Dimension of the distance from the front to the back, such as the depth of structural framing in a wall or floor. It can also be the distance from the top to the bottom, such as the depth of a tank or pool of a component or material, such as the depth of the structural framing	View	ft
Derivation Method	The method by which the data was learned.	View	None
Description	A longer text description.	View	None
Desiccant wheel		View	None
Design	Setpoint qualifier for design conditions	View	None
Design ambient temperature	The ambient air temperature under design conditions.	View	None
Design development	Drawings for the site, building plans and elevations are further developed, along with drawings for building appearance, typical construction detail, and selection and specification of major building materials. Preliminary specifications for mechanical and electrical systems and their layouts is developed. Detailed energy analysis and energy modeling are used to evaluate envelope alternatives, mechanical systems types and initial sizing, and operational strategies.	View	None
Design files	From a design program (e.g. CAD/BIM files)	View	None
Design Static Pressure	The design static pressure for the fan	View	Pa
Design target	Intended to serve as a reference for comparing the actual value with a design value to evaluate relative performance	View	None
Design temperature difference	The difference between the condensing temperature of the refrigerant in the condenser and the design ambient temperature.	View	None
Desktop	A computer where the main unit is intended to be located in a permanent location, often on a desk or on the floor. Desktop computers are not designed for portability and utilize an external computer display, keyboard and mouse. Desktop computers are designed for a broad range of home and office applications, including point of sale applications.	View	None
Dessert	The sweet course eaten at the end of a meal or in between meals.	View	None
Desuperheater valve	The level of refrigerant superheater is controlled using a desuperheater valve. A refrigerant-to-water heat exchanger that transfers heat from high-pressure, high-temperature refrigerant to domestic water. Heat transfer occurs when the heat pump (air conditioner) operates to satisfy the building space conditioning load. Within the refrigeration circuit, the desuperheater is located between the compressor discharge and the reversing valve of a heat pump or between the compressor discharge and the inlet to the refrigerant-to-air condenser of an air conditioner.	View	None
Diameter	Diameter of an object	View	ft
Diesel		View	None

Version 2.6

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