Working Principle of Heat Pumps for Dummies
What is a heat pump? Heat Pumps for Dummies Well… to begin with, a heat pump is actually a pump. But it, for example, conducts heat instead of water. Like a water pump, a heat pump moves materials from one place to another … only, because it’s a heat pump, it moves heat from one place to another. A common type of heat pump, often used, collects heat from the air and moves that heat indoors to keep us warm. Here is a picture of the most common type of heat pump: At the top is a large fan that pulls a large amount of air through the unit, extracting heat from the air that heats a liquid. Heat Pumps for Dummies It sends the hot fluid to the house through a small pipe (barely visible on the bottom left of the heat pump). Here’s another picture of a heat pump… extracting heat from the cold winter air and sending it into the home to keep everyone warm and comfortable… As you can see, heat pumps can extract heat from cold air, which helps heat our homes. Take a look at this image, which shows how a heat pump works: Here is another picture of a house heated by a heat pump… “Where’s the heat pump?” You may ask yourself that. Heat Pumps for Dummies You can’t really see the heat pump because it’s in the basement, the other main part is below the floor… Heat pipes can explained. we talk about heat pumps and how heat pumps work. At different types of heat pumps, their applications, and animated projects to develop your HVAC engineering knowledge. how heat pumps work, Heat pumps for dummies air-to-air heat pumps, air-to-water heat pumps, ground source heat pumps, and water source heat pumps. A key feature of heat pumps is how energy efficient they are, and Danfoss has everything you need to ensure your heat pump runs “360° energy efficient”. They’ve also created a heat pump website with business cases, case stories, e-courses and a fun diagram like the one seen on this channel so you can see how it all comes together. the first thing we’re going to look at the air-to-air heat pump. Heat Pumps for Dummies These are the simplest types of heat pumps. They often look similar to a standard air conditioning split unit, with one unit located outside and the other unit located inside. These can only function as a heating device, but a more popular option is a device that can provide both heating and cooling using a reversing valve. Heat pumps for dummies We have described how reversing valves work in our previous video tutorial, click here to watch. There are a few ways to configure a reversing heat pump, but I’ll show you a simple, common example. The Main Component We have a compressor, reversing valve, internal heat exchanger, expansion valve with non-return valve bypass, bi-directional filter drier, a sight glass, and another expansion valve with non-return valve bypass. Then we have the external heat exchanger. Heat Pumps for Dummies We have a controller and several temperature and pressure sensors around the system. In heating mode, the refrigerant leaves the compressor as high-pressure, high-temperature vapor and enters the reversing valve. Heat Pumps for Dummies The reversing valve can placed in the heating mode so that the refrigerant passes through the indoor unit. Cool air can be blown over the indoor unit heat exchanger, removing some of the heat energy and providing heat to the room. As heat is removed, the refrigerant condenses. Heat Pumps for Dummies After giving up some of its energy, the refrigerant exits as a high-pressure, slightly cooled, liquid. The refrigerant then comes to the expansion valve and the bypass, the expansion valve closes, so the liquid refrigerant passes through the non-return valve, filter drier, and sight glass, then through the expansion valve as the non-return valve is on the side. Blocks the flow. As the refrigerant passes through the expansion valve, the refrigerant expands in volume and becomes a part liquid, part vapor mixture. This volume expansion reduces temperature and pressure. Heat pumps for dummies We have described how thermal expansion valves work and how electronic expansion valves work, click on the links to learn about them. Then the coolant moves the working principle of the rotor oil pump with diagram. External Heat Exchanger Heat Pumps For Dummies Here, a fan blows ambient air over the coil and adds heat to the cold refrigerant. Refrigerant boils at a very low temperature, and as it boils it absorbs heat energy. For example, we know that when water boils it transfers heat energy in the form of steam and it boils at 100*C (212*F), if we look at some common heat pump refrigerants, the boiling point of R134a is -26.3. °C (-15.34*F) and the boiling point of R410A is -48.5 °C (-55.3*F). Hence it is very easy to extract heat energy even at very low outdoor temperatures. Heat Pumps for Dummies We explained how coolers work in a previous video, again the links are below. So the refrigerant takes heat energy from the outside air, leaves the outside heat exchanger as low pressure, low temperature slightly superheated steam and returns to the reversing valve. The reversing valve transfers it back to the compressor to repeat the cycle. When the system can switched to cooling mode, the system works like a normal split air conditioner. The compressor sends the high-pressure, high-temperature vapor refrigerant to the reversing valve, where the reversing valve transfers it to the outdoor unit. The outdoor unit fan blows ambient air into the heat exchanger, this air is at a cooler temperature, so it carries away the heat energy of the refrigerant. Refrigerant condenses Heat pumps for dummies Refrigerant condenses as it loses its heat energy. It then emerges as a high-pressure, low-temperature liquid refrigerant. It then goes to the expansion valve, but since it can closed, the refrigerant passes … Read more