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| Design cooling load
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The amount of conditioned air to be supplied by a cooling system; usually the maximum amount to be delivered based on a specified number of cooling degree days or design temperature. |
| Design heating load
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The amount of heated air, or heating capacity, to be supplied by a heating system; usually the maximum amount to be delivered based on a specified number of heating degree days or design outside temperature. |
| Design life
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Period of time a system or appliance (or component of) is expected to function at its nominal or design capacity without major repair. |
| Design temperature
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The temperature that a system is designed to maintain (inside) or operate against (outside) under the most extreme conditions. |
| Design tip speed ratio
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For a wind turbine, the ratio of the speed of the tip of a turbine blade for which the power coefficient is at maximum. |
| Design voltage
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The nominal voltage for which a conductor or electrical appliance is designed; the reference voltage for identification and not necessarily the precise voltage at which it operates. |
| Designer
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One who designs houses, interiors, landscaping or other objects. When used it the context of residential construction it usually suggests that a designer is not a licensed architect. Most jurisdictions don't require an architectural license for most single family construction. |
| Desuperheater
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An energy saving device in a heat pump that, during the cooling cycle, recycles some of the waste heat from the house to heat domestic water. |
| Detail
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Information added to a drawing to provide specific instruction with a drawing, dimensions, notes, or specifications. |
| Detail sander
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Detail sanders have a unique, triangular-shaped head geared for smaller, tighter and more detail-oriented jobs. |
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