Part 1 Flashcards
___________________ require the use of efficient machinery and equipment. ______________ is usually expressed as the ratio of the power delivered by a mechanical system to the power supplied to it. Because of friction, this ____________ is always less than one
Mechanical Systems, efficiency 2X
An efficient mechanical system, specifically for AIR-CONDITIONING of room spaces, reduces energy consumption while maintaining occupant comfort. Goals are achieved by:
1. _____________ equipment efficiency at design conditions and during part load operation;
2. ______________distribution losses of heating and cooling energy; and
3. _____________ system control to minimize unnecessary operation.
Maximizing
Minimizing
Optimizing
Employs water as the condensing medium and uses pumps to circultae the water through the condenser and out to a cooling tower that ejects the head to the atmosphere.
Water - cooled chilled water cooling system
delivers cooled air inside the building
air handling unit
convey cooled water to supply to AHUs
chilled water pipes
_______________________ typically accounts for more than ______________ of total electricity costs in a CENTRALLY COOLED air-conditioned building. Hence, the efficiency of an air conditioning system is of prime importance.
Air conditioning, 50%
The heart of the air conditioning system is the _____________________, typically CHILLERS in large buildings and is important to procure an efficient cooling system.
cooling system
The use of energy-efficient _________________ in buildings, by observing _____________ power performance requirements, will help reduce energy consumption due to heating of water.
water heating systems, minimum
_______________________ describes the equipment used to control the speed of machinery by changing the frequency of the motor that is being operated. Where process conditions demand adjustment of flow from a pump or fan, varying the speed of the drive may save energy compared with other techniques for flow control.
Variable Speed Drive
When buildings have OUTSIDE or FRESH air supply and extract system through mechanical means, using heat exchangers can use the air extracted from the building areas to pre-condition the incoming outdoor air. This process exploits the fact that the extract air is usually already conditioned and therefore colder and drier.
Enthalpy Recovery of Exhaust Air
_____________________ provides an accessible path, leading from one level to another by targeting to meet the needs of all target groups.
Vertical transportation
This is the most used means of vertical transportation.
Stairs
All steps lead in one direction This may be continuous with two flights with an intermediate landing. Adopted when the staircase is narrow and long
Straight Stair
Consist of two straight flights running in opposite directions. There is no space between the flights in the plan. Landing is provided at level which direction of flight changes.
Dog-legged Stair
______________
These stairs may have any geometrical shape and they require no NEWEL post. This type of stair is similar to open NEWEL stairs except the well-formed between forwarding and the backward flight is curved. Change of direction in such stairs is achieved by __________ and not by landing.
Geometric Shape
winders
