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It also addresses compressor function, refrigerant circulation, refrigeration and air-conditioning terminology such as tons and BTU, plus related airflow and infiltration concepts.",{"@graph":14,"@context":73},[15,34,56],{"@type":16,"itemListElement":17},"BreadcrumbList",[18,23,27,31],{"item":19,"name":20,"@type":21,"position":22},"https://docshare.wps.com","Home","ListItem",1,{"item":24,"name":25,"@type":21,"position":26},"https://docshare.wps.com/document/","Document",2,{"item":28,"name":29,"@type":21,"position":30},"https://docshare.wps.com/document/exam/","Exam",3,{"item":32,"name":10,"@type":21,"position":33},"https://docshare.wps.com/document/hvac-interview-questions-and-answers-hvac-simplified/391336/",4,{"url":32,"name":10,"@type":35,"image":36,"author":41,"headline":10,"publisher":44,"fileFormat":47,"inLanguage":8,"description":12,"dateModified":48,"datePublished":49,"encodingFormat":47,"isAccessibleForFree":50,"interactionStatistic":51},"DigitalDocument",{"url":37,"@type":38,"width":39,"height":40},"https://docshare.wps.com/thumbnails/hvac-interview-questions-and-answers-hvac-simplified/391336.png","ImageObject",300,407,{"name":42,"@type":43},"Jake","Person",{"url":19,"name":45,"@type":46},"DocShare","Organization","application/pdf","2026-11-08","2026-09-25",true,{"@type":52,"interactionType":53,"userInteractionCount":55},"InteractionCounter",{"@type":54},"ViewAction",15,{"@type":57,"mainEntity":58},"FAQPage",[59,65,69],{"name":60,"@type":61,"acceptedAnswer":62},"What is the difference between a constant volume (CAV) system and a variable air volume (VAV) system?","Question",{"text":63,"@type":64},"CAV supplies a constant air flow rate but varies supply air temperature to meet thermal loads. 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Question 1. What Is Local Comfort Cooling System?  \nAnswer:  \nThey may be integrated, with heating, ventilation and air conditioning provided by a single system, for example, air handling units connected to ductwork, or they may be a combination of separate systems, for example mechanical ventilation but with radiators for heating and local comfort cooling units.  \n2. Question 2. What Is Centralized Air System?  \nAnswer:  \nThe most common central cooling system is a split system, which includes an outdoor cabinet containing a condenser coil and compressor, and an indoor evaporator coil, usually installed in conjunction with your furnace. Or air handler. The compressor pumps a chemical called refrigerant through the system.  \n3. Question 3. What Is Constant Volume System?  \nAnswer:  \nConstant Air Volume (CAV) is a type of heating, ventilating, and air-conditioning (HVAC) system. In a simple CAV system, the supply air flow rate is constant, but the supply air temperature is varied to meet the thermal loads of a space. Most CAV systems are small, and serve a single thermal zone.  \n4. Question 4. What Is Variable Air Volume System & Dual Duct System?  \nAnswer:  \nVariable Air Volume (VAV) is a type of heating, ventilating, and/or air-conditioning (HVAC) system. Unlike constant air volume (CAV) systems, which supply a constant airflow at a variable temperature, VAV systems vary the airflow at a constant temperature.  \n5. Question 5. What Is Hydronic System or Air-water System?  \nAnswer:  \nHydronic systems circulate hot water through warming baseboards, radiators and/or radiant tubing in your floors or ceilings. There are many advantages to heating your home using ahydronic system, whether it is for a new home or as a replacement heating system.  \n6. Question 6. How Vapor Compression Cycle Works?  \nAnswer:  \nThe Vapor-Compression Refrigeration Cycle is comprised of four steps   The condenser is in contact with the hot reservoir of the refrigeration system. (The gas releases heat into the hot reservoir because of the external work added to the gas.) The refrigerant leaves as a high pressure liquid.  \n7. Question 7. What Is Vapor Compression Cycle?  \nAnswer:  \nVapor-Compression Refrigeration or vapor-compression refrigeration system (VCRS), in which the refrigerant undergoes phase changes, is one of the many refrigeration cycles and is the most widely used method for air-conditioning of buildings and automobiles.  \n8. Question 8. Why Is A Compressor Used In Refrigeration?  \nAnswer:  \nThe compressor does exactly as its name says: it compresses the refrigerant. The compressor receives low pressure gas from the evaporator and converts it to high pressure gas. As mentioned earlier, as the gas is compressed, the temperature rises. The hot refrigerant gas then flows to the condenser.  \n9. Question 9. What Is Auto Refrigeration?  \nAnswer:  \nAuto-refrigeration is a process where an unintentional and/or uncontrolled phase change of a hydrocarbon from a liquid state to a vapor occurs, resulting in a very rapid chilling (refrigeration) of the liquid containing local equipment and/or piping.  \n10. Question 10. How Does A Refrigerant Compressor Work?  \nAnswer:  \no The compressor constricts the refrigerant vapor, raising its pressure, and pushes it into the coils on the outside of the refrigerator.  \no When the hot gas in the coils meets the cooler air temperature of the kitchen, it becomes a liquid.  \no The refrigerant absorbs the heat inside the fridge, cooling down the air.  \n11. Question 11. Why Capacity Of Air Conditioner Is Measured In Tons?  \nAnswer:  \nA 4 ton air conditioner is one that can remove 48,000 BTUs of heat per hour from the house. Formost people, though, 4 tons means 8000 pounds. (A BTU is a British thermal unit, approximately the amount of heat you get from burning one kitchen match all the way down.)  \n12. Question 12. What Is The Meaning Of 1 Ton Of Ac?  \nAnswer:  \nA ton, as used in the HVAC field, is a term that describes h","cbCaigEkLZqmf6f1","https://ap.wps.com/l/cbCaigEkLZqmf6f1","pdf",640988,"English","# HVAC Interview Questions And Answers\n## System types and concepts\n## Refrigeration cycle and key measurements","[{\"question\":\"What is the difference between a constant volume (CAV) system and a variable air volume (VAV) system?\",\"answer\":\"CAV supplies a constant air flow rate but varies supply air temperature to meet thermal loads. VAV varies airflow while maintaining a constant temperature to differ from CAV operation.\"},{\"question\":\"How does the vapor-compression refrigeration cycle work at a high level?\",\"answer\":\"It operates through a multi-step cycle where the refrigerant interacts with hot and cold reservoirs and undergoes phase changes. The condenser releases heat, and the refrigerant is moved through the system as pressure changes across components.\"},{\"question\":\"Why is air conditioner capacity measured in tons, and how does that relate to BTU?\",\"answer\":\"One ton describes how much heat the AC can remove in one hour, equal to 12,000 BTUs per hour. Related measures like BTU define heat quantity, including conversions to joules and watt equivalents.\"}]","HVAC Interview Questions And Answers - HVAC Simplified | PDF",1790352180,18]