制冷基础知识测试

由布莱恩·奥尔

2016年12月29日

制冷基础知识测试

测试一下你的技能，看看你是制冷基础专业人士还是零件更换专家

10评论

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伟大的测验!我刚刚在之前的评论中留下了一个关于制冷类问题的请求。故障排除类型的问题也将感激。感谢你花时间做这些小测验。

布莱恩奥尔 说：

在17:02 2021.11.06

指出,赞赏。新年快乐，乔。

回复

3我错了3个答案，最近没有做过大量的制冷，但他们都是对的。你需要看看小更深。杰里姆，杰里米。

非常棒的测试，特别是因为我只是在amonia工厂工作，英语不是我的主要语言，这是为我的F气体资格准备的一部分，非常感谢你的帮助

祝你好运。我们可以通过não多米诺骨牌，我们可以通过你的朋友，estão de parbéns

谢谢你的测试。我只需要控制装置就行了。哈哈。学习是我的目标。

通常，冷控制在达到的范围内感测线圈温度以确保截止循环除霜。在步入中，冷控制通常会感应箱温度。

有趣的测试，10/10的人不得不猜恒温器，这不是一个东西。

我喜欢这些播客。

我是这个行业的新人，刚刚接受了一个月的培训。我发现你们的媒体是一项伟大的公共服务，你们所分享的知识的广泛获取对我的培训来说是无价的。非常感谢你在暖通社区分享了这么多有用的内容!!期待在我成为一名专业技术人员的旅程中筛选所有的内容

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电热故障排除，服务，和数学课

我们最新的播客

In this podcast, Steve Rogers from The Energy Conservatory explains some pro tips for pressure measurement.<\/p>\n

\u00a0<\/p>\n

There are three common types of pressure measurements: absolute, gauge, and differential. Absolute pressure is the pressure in a particular space in reference to a complete vacuum. (All absolute measurements use the zero point as a reference.) Gauge pressure uses atmospheric pressure as a reference point (which varies with altitude and location). Differential pressure relies on two connections (one of them is a reference point to the other).<\/p>\n

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The Energy Conservatory recently designed a manometer (DG-8) that differs from the standard manometers. The purpose of that manometer is to make pressure measurements in a more cost-effective way. Most manometers have similar sensors (diaphragms move with pressure, and the measurement read is the resulting difference in resistance). However, the DG-8\u2019s methodology can help it yield much more accurate measurements.\u00a0<\/p>\n

\u00a0<\/p>\n

When dealing with small pressure measurements (like Pascals), the DG-8 is one of the most accurate manometers you will find on the market.<\/p>\n

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When you look at room pressure, keep in mind that pressurizing one room will depressurize another. Temperature differences also impact the pressure, and the HVAC unit can cause differences in pressure to arise as a result of temperature differences. When you run the kitchen or bathroom exhaust and expel a lot of air in your home, you can also bring the home under negative pressure; that can even cause your water heater to backdraft.<\/p>\n

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Steve and Bryan also discuss:<\/p>\n

Blower door manometers vs. DG-8 manometers<\/li>\n
Pascal scale<\/li>\n
Room pressures and air paths<\/li>\n
Infiltration and its effect on load calculations<\/li>\n
Dominant duct leakage<\/li>\n
Combustion appliance zone (CAZ) testing<\/li>\n
Mechanical ventilation and pressure<\/li>\n
Orphaned water heaters<\/li>\n
DG-8 and the TrueFlow grid<\/li>\n<\/ul>\n
\u00a0<\/p>\n
Learn more about the DG-8 HERE<\/a>.<\/p>\n
\u00a0<\/p>\n
If you have an iPhone, subscribe to the podcast HERE<\/a>, and if you have an Android phone, subscribe HERE<\/a>.<\/p>\n
\u00a0<\/p>\n
Check out our handy calculators HERE<\/a>.<\/p>\n
Check out information on the 2022 HVACR Training Symposium at \/\/www.desamelle.com\/symposium\/<\/a>.<\/p>\n","author":"Bryan Orr","date":"11\/04\/2021","link":"https:\/\/traffic.libsyn.com\/secure\/hvacschool\/Pressure_Measurement_Pro_Tips_w_Steve_Rogers.mp3","src":"https:\/\/traffic.libsyn.com\/secure\/hvacschool\/Pressure_Measurement_Pro_Tips_w_Steve_Rogers.mp3?dest-id=425611","featured":"\/\/www.desamelle.com\/wp-content\/uploads\/2021\/11\/Pressure_Measurement_Pro_Tips_w_Steve_Rogers-768x768.jpg","mediatype":"audio","featured_id":76301,"key":"cf8169eb8d4b5368ff79c5d1254210f9","fset":"\/\/www.desamelle.com\/wp-content\/uploads\/2021\/11\/Pressure_Measurement_Pro_Tips_w_Steve_Rogers-768x768.jpg 768w, \/\/www.desamelle.com\/wp-content\/uploads\/2021\/11\/Pressure_Measurement_Pro_Tips_w_Steve_Rogers-300x300.jpg 300w, \/\/www.desamelle.com\/wp-content\/uploads\/2021\/11\/Pressure_Measurement_Pro_Tips_w_Steve_Rogers-1024x1024.jpg 1024w, \/\/www.desamelle.com\/wp-content\/uploads\/2021\/11\/Pressure_Measurement_Pro_Tips_w_Steve_Rogers-150x150.jpg 150w, \/\/www.desamelle.com\/wp-content\/uploads\/2021\/11\/Pressure_Measurement_Pro_Tips_w_Steve_Rogers-1536x1536.jpg 1536w, \/\/www.desamelle.com\/wp-content\/uploads\/2021\/11\/Pressure_Measurement_Pro_Tips_w_Steve_Rogers-2048x2048.jpg 2048w"},"ppe-5777-2":{"title":"Copeland Reciprocating CS Compressors w\/ Trevor","description":"
Trevor Matthews from Emerson and Refrigeration Mentor<\/a> comes on the podcast to talk about Copeland reciprocating CS compressors. He and Bryan cover Bulletin AE4-1433 (found HERE<\/a>) as they look at the operating envelopes for the CS compressor.<\/p>\n
\u00a0<\/p>\n
The CS compressors are hermetic reciprocating compressors that can work with some of the newer refrigerants. You will likely see these compressors in applications with smaller tonnages.\u00a0<\/p>\n
\u00a0<\/p>\n
You\u2019ll usually want to charge these compressors with liquid refrigerant. If you have more than 6 pounds of charge in the system, using an accumulator is recommended. Under those charge conditions, the system also needs a check valve between the receiver and the condenser.<\/p>\n
\u00a0<\/p>\n
Suction line pressure drop is one of the most important things to pay attention to in the system. Make sure the suction line is of an appropriate size, that filter-driers don\u2019t have restrictions, and that accumulators aren\u2019t clogged. Overall, many manufacturers recommend removing the duction driers to keep the pressure drop minimal.<\/p>\n
\u00a0<\/p>\n
The recommended runtime for these compressors is also very short, only 5 minutes. CS compressors should cycle no more than 12 times per hour, and the off-time between cycles should be a minimum of 10 seconds.<\/p>\n
\u00a0<\/p>\n
Before returning or replacing a compressor, make sure you check all of the electrical components, including the capacitor. If the compressor hums but has power, you could simply have a capacitor or potential relay issue.<\/p>\n
\u00a0<\/p>\n
Trevor and Bryan also discuss:<\/p>\n
- Hard start kits, potential relays, and start capacitors<\/li>\n<\/ul>\n
  If you have an iPhone, subscribe to the podcast HERE<\/a>, and if you have an Android phone, subscribe HERE<\/a>.<\/p>\n
  \u00a0<\/p>\n
  Check out our handy calculators HERE<\/a>.<\/p>\n
  Check out information on the 2022 HVACR Training Symposium at \/\/www.desamelle.com\/symposium\/<\/a>.<\/p>\n","author":"Bryan Orr","date":"10\/28\/2021","link":"https:\/\/traffic.libsyn.com\/secure\/hvacschool\/Copeland_Reciprocating_CS_Compressors_w_Trevor.mp3","src":"https:\/\/traffic.libsyn.com\/secure\/hvacschool\/Copeland_Reciprocating_CS_Compressors_w_Trevor.mp3?dest-id=425611","featured":"\/\/www.desamelle.com\/wp-content\/uploads\/2021\/10\/Copeland_Reciprocating_CS_Compressors_w_Trevor-768x768.jpg","mediatype":"audio","featured_id":76128,"key":"eec529e0f8169c83e00c6d0058ecac38","fset":"\/\/www.desamelle.com\/wp-content\/uploads\/2021\/10\/Copeland_Reciprocating_CS_Compressors_w_Trevor-768x768.jpg 768w, \/\/www.desamelle.com\/wp-content\/uploads\/2021\/10\/Copeland_Reciprocating_CS_Compressors_w_Trevor-300x300.jpg 300w, \/\/www.desamelle.com\/wp-content\/uploads\/2021\/10\/Copeland_Reciprocating_CS_Compressors_w_Trevor-1024x1024.jpg 1024w, \/\/www.desamelle.com\/wp-content\/uploads\/2021\/10\/Copeland_Reciprocating_CS_Compressors_w_Trevor-150x150.jpg 150w, \/\/www.desamelle.com\/wp-content\/uploads\/2021\/10\/Copeland_Reciprocating_CS_Compressors_w_Trevor-1536x1536.jpg 1536w, \/\/www.desamelle.com\/wp-content\/uploads\/2021\/10\/Copeland_Reciprocating_CS_Compressors_w_Trevor-2048x2048.jpg 2048w"},"ppe-5777-3":{"title":"Adiabatic Cooling – Short 130","description":"
  In this short podcast episode, Bryan explains the science behind adiabatic cooling. Adiabatic cooling occurs in specific HVAC\/R applications and in our environment as air temperatures and pressures change.<\/p>\n
  \u00a0<\/p>\n
  When we think of cooling, we refer to the loss of heat; we are either referring to the change in the total BTU content of the air mass or the temperature change. Adiabatic cooling takes sensible heat and transforms it into latent heat.<\/p>\n
  \u00a0<\/p>\n
  The most simple forms of adiabatic cooling can be seen in cooling towers and swamp coolers. In evaporative or swamp coolers, you have a pad saturated with water, and air moves over it. When air moves over the media, some of the energy helps evaporate the moisture on the pads, so the air loses sensible heat and becomes cooler. The thermal enthalpy (total heat content) stays the same, but some of the sensible heat has transferred to latent heat.\u00a0<\/p>\n
  \u00a0<\/p>\n
  Air that goes through a swamp cooler goes in with higher temperature and lower humidity, and it leaves with a lower temperature and higher humidity. The BTU content stays the same; the energy merely transforms. As a result, we usually only use swamp coolers in arid environments where higher humidity is desirable. You also can\u2019t compare these to compression-refrigeration systems because compression refrigeration aims to change the BTU content and is NOT adiabatic.<\/p>\n
  \u00a0<\/p>\n
  When we run air over an evaporator coil, some of the water vapor in the air condenses to liquid water in the drain pan. Some of the energy in the refrigerant changes the state of the water vapor to liquid water instead of changing the temperature. You\u2019ll see a lower delta T when your return relative humidity (RH) is higher.<\/p>\n
  \u00a0<\/p>\n
  If you have an iPhone, subscribe to the podcast HERE<\/a>, and if you have an Android phone, subscribe HERE<\/a>.<\/p>\n
  \u00a0<\/p>\n
  Check out our handy calculators HERE<\/a>.<\/p>\n
  Check out information on the 2022 HVACR Training Symposium at \/\/www.desamelle.com\/symposium\/<\/a>.<\/p>\n","author":"Bryan Orr","date":"10\/26\/2021","link":"https:\/\/traffic.libsyn.com\/secure\/hvacschool\/Adiabatic_Cooling_-_Short_130.mp3","src":"https:\/\/traffic.libsyn.com\/secure\/hvacschool\/Adiabatic_Cooling_-_Short_130.mp3?dest-id=425611","featured":"\/\/www.desamelle.com\/wp-content\/uploads\/2021\/10\/Adiabatic_Cooling_-_Short_130-768x768.jpg","mediatype":"audio","featured_id":76082,"key":"ce364255c9ebb052a43ce1cd35872681","fset":"\/\/www.desamelle.com\/wp-content\/uploads\/2021\/10\/Adiabatic_Cooling_-_Short_130-768x768.jpg 768w, \/\/www.desamelle.com\/wp-content\/uploads\/2021\/10\/Adiabatic_Cooling_-_Short_130-300x300.jpg 300w, \/\/www.desamelle.com\/wp-content\/uploads\/2021\/10\/Adiabatic_Cooling_-_Short_130-1024x1024.jpg 1024w, \/\/www.desamelle.com\/wp-content\/uploads\/2021\/10\/Adiabatic_Cooling_-_Short_130-150x150.jpg 150w, \/\/www.desamelle.com\/wp-content\/uploads\/2021\/10\/Adiabatic_Cooling_-_Short_130-1536x1536.jpg 1536w, \/\/www.desamelle.com\/wp-content\/uploads\/2021\/10\/Adiabatic_Cooling_-_Short_130-2048x2048.jpg 2048w"},"ppe-5777-4":{"title":"Fighting Boredom at Work – Short 129","description":"
  In this short podcast episode, Bryan shares his top tips for fighting boredom at work. You can use these tips to help you get out of a rut if you don\u2019t feel productive or get bored easily.<\/p>\n
  \u00a0<\/p>\n
  The first tip is to see the art or creativity in your work. Even in the HVAC industry, there are plenty of opportunities for artisan skills and craftsmanship. When you see your work as an art that you need to refine, especially in terms of duct strapping and brazing, it\u2019s easier to get engaged in your work and feel proud of it.<\/p>\n
  \u00a0<\/p>\n
  Another way to stop from getting bored is to do more things that challenge you. Being constantly challenged and being out of your comfort zone keeps you interested and can even spark a new passion.<\/p>\n
  \u00a0<\/p>\n
  Pursuing mastery allows you to focus on one particular skill or subject to become an expert. When you master a skill, you also become a marketable job candidate and can carve out a niche within your organization. Mastery is about going deep rather than wide, and more people will feel enriched by working towards mastery than others.<\/p>\n
  \u00a0<\/p>\n
  If you\u2019re a social person, finding a community can keep you from getting bored. When you have a community, you will be around people who have the same interests and experience the same challenges as you. So, you won\u2019t get bored from feeling alone.<\/p>\n
  \u00a0<\/p>\n
  Mentorship is another way to rekindle your passion. When you choose to invest in and guide less experienced people in the trade, you can feel a renewed sense of purpose in your work.\u00a0<\/p>\n
  \u00a0<\/p>\n
  And if you\u2019re REALLY bored, you can change everything up entirely and try something new.<\/p>\n
  \u00a0<\/p>\n
  If you have an iPhone, subscribe to the podcast HERE<\/a>, and if you have an Android phone, subscribe HERE<\/a>.<\/p>\n
  \u00a0<\/p>\n
  Check out our handy calculators HERE<\/a>.<\/p>\n
  Check out information on the 2022 HVACR Training Symposium at \/\/www.desamelle.com\/symposium\/<\/a>.<\/p>\n","author":"Bryan Orr","date":"10\/19\/2021","link":"https:\/\/traffic.libsyn.com\/secure\/hvacschool\/Fighting_Boredom_at_Work_-_Short_129.mp3","src":"https:\/\/traffic.libsyn.com\/secure\/hvacschool\/Fighting_Boredom_at_Work_-_Short_129.mp3?dest-id=425611","featured":"\/\/www.desamelle.com\/wp-content\/uploads\/2021\/10\/Fighting_Boredom_at_Work_-_Short_129-768x768.jpg","mediatype":"audio","featured_id":75915,"key":"23320b86d146c620dbcb1f8cb6707db1","fset":"\/\/www.desamelle.com\/wp-content\/uploads\/2021\/10\/Fighting_Boredom_at_Work_-_Short_129-768x768.jpg 768w, \/\/www.desamelle.com\/wp-content\/uploads\/2021\/10\/Fighting_Boredom_at_Work_-_Short_129-300x300.jpg 300w, \/\/www.desamelle.com\/wp-content\/uploads\/2021\/10\/Fighting_Boredom_at_Work_-_Short_129-1024x1024.jpg 1024w, \/\/www.desamelle.com\/wp-content\/uploads\/2021\/10\/Fighting_Boredom_at_Work_-_Short_129-150x150.jpg 150w, \/\/www.desamelle.com\/wp-content\/uploads\/2021\/10\/Fighting_Boredom_at_Work_-_Short_129-1536x1536.jpg 1536w, \/\/www.desamelle.com\/wp-content\/uploads\/2021\/10\/Fighting_Boredom_at_Work_-_Short_129-2048x2048.jpg 2048w"},"ppe-5777-5":{"title":"Review Of Vacuum For Service Revisted","description":"
  In this podcast episode, Bryan goes through the addendum to the book Review of Vacuum for Service Engineers<\/em>. He and Jim Bergmann had the honor of revising the latest edition in 2020. You can get the latest edition of Review of Vacuum for Service Engineers<\/em> from TruTech Tools HERE<\/a>.<\/p>\n
  \u00a0<\/p>\n
  Pulling a Schrader core before evacuation makes a big difference in the speed of the evacuation. You can use a core remover tool to pull the cores when the system is NOT pressurized.\u00a0<\/p>\n
  \u00a0<\/p>\n
  There are three common types of ports to access the system: the Schrader core, high-flow core (CoreMax), and the multi-position service valve. You can mid-seat the multi-position service valve for high flow, but you need to remove or depress cores on the other two port types. (You must use a special CoreMax CRT to remove high-flow cores.)<\/p>\n
  \u00a0<\/p>\n
  Three factors limit the speed of evacuation: the conductance speed of the pump, of the connecting hoses, and of the system. The hoses and manifold can severely impact evacuation. TXV and piston metering devices have short orifices and have very little impact on the evacuation time; on TXVs and EXVs, the valve should be fully open.<\/p>\n
  \u00a0<\/p>\n
  When pulling a vacuum, make sure the vacuum pump works properly and has clean oil. Once you know that the pump is working, only pull on a tight system (no leaks) and make sure the seals are in good shape.\u00a0\u00a0<\/p>\n
  \u00a0<\/p>\n
  Bryan also discusses:<\/p>\n

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蝰蛇冷凝盘和排水处理是一种可喷雾凝胶。它在锅、p型疏水阀和排水管道上涂上一层润滑膜，以改善流动并防止未来的土壤粘附。这种缓慢溶解的酶凝胶将比传统的药片和贴片效果更好，寿命更长。

尼龙蓝垫圈 - 用于AC / R系统的密封剂
在安装核心工具、软管或真空计之前，在胶管垫片上滴一滴Nylog，可确保在疏散过程中物品不会粘住或泄漏。源自制冷级润滑油。不硬化、不干燥的液体，可与许多不同的基材牢固结合。一般来说，一滴Nylog在断裂前可以被拉伸三英尺左右。

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