Hvac final correct stuvia Study guides, Class notes & Summaries

A_____is the quantity of heat required to raise the temperature of I lb of water |°F. - ANSWER British thermal unit (BTU) Comfor is typically attained at normal cooling and heating temperatures with a relative humidity of about _____% - ANSWER 50% _________is the movement of air through distribution systems and building spaces. - ANSWER Air circulation ___________is the variation of air temperature in a building space that occurs when warm air rises to the ceiling and cold air drops to...

environment - ANSWER natural factors that impact a bldg including the sun, wind, temp, etc Technology - ANSWER constructed factors including the bldg itself, HVAC and mechanical systems impact on building - ANSWER thermal behaviors/physics, comfort conservation equation - ANSWER defines the balance of flows and the change in an amount stored of some quantity of interest within some fixed volume conservation of mass - ANSWER mass is neither created nor destroyed conservation of ene...

sustainability - ANSWER meeting energy needs of today's without detracting from ability of future generations to meet their needs global warming/climate change - ANSWER general rise in average annual global temperature ozone layer depletion - ANSWER loss of ozone molecules in atmosphere resulting in increase in harmful solar radiation levels Internal Load Dominated Building type (ILD) - ANSWER • Thicker, taller buildings • High internal heat gains • Inside impacts building resp...

1. Where is the heater core located? - ANSWER In the dash 2. In a system with no PTC heater, how is the coolant heated? - ANSWER the engine heats the coolant 3. How is current controlled in a PTC heater? - ANSWER The PTC is Self regulated resistence, Changes with heat and makes it shut off. 4. What component is responsible for circulating the air inside the cabin? - ANSWER Blower motor 5. What is a benefit of using a PTC heater? - ANSWER It Provides heat without having the car on. ...

a unit is operating with a lower than normal suction pressure the probable cause is - ANSWER a restricted drier heat absorbed by the refrigerant in the evaporator is rejected at the - ANSWER condenser the components that divide the high and low side of the mechanical refrigeration cycle are the - ANSWER compressor discharge valve and metering device what is the purpose of purging the service manifold - ANSWER remove air moisture to transfer refrigerant from a bulky Supply cylinder to...

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Furnace - ANSWER The air flow on most structures that use a fossil fuel for a heat source have a___that would be used as an air supply. Control loop - ANSWER Almost all control systems use a___to control the temperature with in a given structure, space, or zone. Troubleshooting - ANSWER A___chart is a graphical representation of a troubleshooting procedure for a particular unit. Overload - ANSWER A___is an electrical device that protects a load from a high ampere draw by breaking a set ...

Spiral wound gaskets are primarily used on - ANSWER high temperature high pressure systems lip type seals are used primarily - ANSWER on rotating shafts The side force applied at right angles to a bearing and shaft such as that applied from a pulley is called a - ANSWER radial load A type of anti-friction bearing is a - ANSWER ball bearing If there is darkened, yet still oily grease present on a failed bearing, a likely cause of failure is - ANSWER high loads or contaminants The v...

IF a heat pump works normally in the heating mode but will not provide cooling or a defrost mode, which component is most likely defective? - ANSWER Reversing valve Air-to-air heat pumps produce heat by - ANSWER extracting heat from the outdoor air and transferring it to the indoor air In addition to the reversing valve, the other major difference between a heat pump and a cooling only system is - ANSWER heat pumps require two metering devices In the cooling mode, the reversing valve is...

volt amps - ANSWER Transformers are normally rated in? true - ANSWER An insulated jumper may be used to temporarily jump a component in an electrical circuit(true or false)? divided by 10 - ANSWER When using a 10 wrap multiplier the reading on the meter must be? ladder diagram - ANSWER An electrical line wiring diagram is often called? pictorial diagram - ANSWER A wiring diagram that shows the approximate location of components is called? clamp on ammeter - ANSWER A 10 wrap ampera...