ASHRAE-90.1-2022- - Page 023
Extracted Content
mechanical cooling: reducing the temperature of a gas or liquid by using vapor compression, absorption, desiccant dehumidification combined with evaporative cooling, or another energy -driven thermodynamic cycle. Indirect or direct evaporative cooling alone is not considered mechanical cooling .
mechanical heating: raising the temperature of a gas or liquid by use of fossil fuel burners, electric resis- tance heaters, heat pumps, or other systems that require energy to operate.
metal building: a complete integrated set of mutually dependent components and assemblies that form a building, which consists of a steel-framed superstructure and metal skin.
metal building roof: see roof .
metal building wall: see wall .
metal building envelope: see building envelope.
metal framing: see vertical fenestration .
metering: instruments that measure electric voltage, current, power, etc.
moisture removal efficiency (MRE): a ratio of the moisture removal capacity in lb of moisture/h to the power input values in kW at any given set of standard rating conditions expressed in lb of moisture/kWh.
motor power, rated: the rated output power from the motor.
nameplate horsepower (hp): the nominal motor output power rating stamped on the motor nameplate.
nameplate rating: the design load operating conditions of a device as shown by the manufacturer on the nameplate or otherwise marked on the device.
NEMA Design A motor: a squirrel-cage motor that
a. is designed to withstand full-voltage starting and developing locked-rotor torque as shown in NEMA
MG 1, paragraph 12.38.1; b. has pull-up torque not less than the values shown in NEMA MG 1, paragraph 12.40.1; c. has breakdown torque not less than the values shown in NEMA MG 1, paragraph 12.39.1; d. has a locked-rotor current higher than the values shown in NEMA MG 1, paragraph 12.35.1, for 60 Hz,
and NEMA MG 1, paragraph 12.35.2, for 50 Hz; and e. has a slip at rated load of less than 5% for motors with fewer than 10 poles.
NEMA Design B motor: a squirrel-cage motor that is
a. designed to withstand full-voltage starting; b. develops locked-rotor, breakdown, and pull-up torques adequate for general application as specified in
NEMA MG1, paragraphs 12.38, 12.39, and 12.40; c. draws locked-rotor current not to exceed the values shown in NEMA MG1, paragraph 12.35.1, for 60
Hz, and paragraph 12.35.2 for 50 Hz; and d. has a slip at rated load of less than 5% for motors with fewer than 10 poles.
NEMA Design C motor: a squirrel-cage motor that
a. is designed to withstand full-voltage starting and developing locked-rotor torque for high-torque appli cations up to the values shown in NEMA MG1, paragraph 12.38.2 (incorporated by reference; see §431.15); b. has pull-up torque not less than the values shown in NEMA MG1, paragraph 12.40.2; c. has breakdown torque not less than the values shown in NEMA MG1, paragraph 12.39.2; d. has a locked-rotor current not to exceed the values shown in NEMA MG1, paragraph 12.35.1, for 60
Hz, and paragraph 12.35.2 for 50 Hz; and e. has a slip at rated load of less than 5%.
networked guest room control system: a control system, accessible from the hotel/motel front desk or other central location, that is capable of identifying rented and unrented rooms according to a timed schedule, and is capable of controlling HVAC in each hotel/motel guest room separately.
nonautomatic: see manual .
nonmetal framing: see vertical fenestration .
nonrecirculating system: a domestic or service hot-water distribution system that is not a recirculating system .
nonresidential: all occupancies other than residential . (See residential .)
ANSI/ASHRAE/IES Standard 90.1-2022 (I-P) 21