Hvac correct stuvia Study guides, Class notes & Summaries

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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...

In a chiller, the refrigerant boils by ___________. - ANSWER absorbing heat from the water passing through it The four main components of a refrigeration system are - ANSWER compressor, condenser, evaporator, & metering device The difference between a contactor and a motor starter is: - ANSWER overload protection If refrigerant condenses at a temperature of 105 degrees F and the water leaves the condenser at a temperature of 95 degrees F, the ___________. - ANSWER condenser approach tem...

A listed smoke damper designed to resist the passage of smoke shall be provided at each point in a duct or air transfer opening penetrates a: (A)smoke barrier wall (B)fire rated wall (C)interior wall (D)corridor wall - ANSWER Corridor wall (IMC 607.5.4) Flexible air duct may be what length? (A)10' (B)2' (C)14' (D)6' - ANSWER 14' (IMC 603.6.1.1) The maximum vertical distance between the front lower lip of a canopy Type 1 hood and the appliance surface shall be ____ feet: (A)5' (B)3' ...

Heat which causes a change in temperature of a substance is called - ANSWERsensible heat, Heat added to a substance without a rise in temperature; (example: liquid refrigerant to gas) this process la called? - ANSWERlatent heat Heat added to the refrigerant in vapor state after the evaporation process is called, - ANSWERsuperheat A scroll compressor moves refrigerant by means of; - ANSWERinvolute spirals The movement of heat by way of fluid or is called; air - ANSWERconvection The...

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. ...

Defects on gas piping or fittings shall be _____.(A) repaired(B) replaced or repaired and retested(C) repaired by a certified welder(D) ignored, as the operating pressure is much less than the air test. - ANSWER B. Fitting shall be replaced or repaired and retested. UMC Section 1316.4.3 Every absorption refrigerating system supported from the ground shall rest on a concrete slab extending not less than _____ the adjoining ground level.(A) 3 inches below(B) 3 inches above (C) 6 inches below(D)...

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...