Heat Pumps for Heating and Cooling

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Heat Pumps for Heating and Cooling ( heat-pumps-heating-and-cooling )

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Heat Pumps for Heating and Cooling CHAPTER – 2 2. AIR SOURCE HEAT PUMPS (ASHP) An Air-source heat pump (ASHP) uses AIR as the heat source when the system is operating in the heating mode. We can use the heat in the air to heat air or water. Accordingly, there are two types of air-source heat pumps. 1. Air to Air heat pump 2. Air to Water heat pump The first word in the category name is the source of heat. The word following “to” is the media that is being treated. This means that when we use the heat in the air to heat air, we call that heat pump an air-to-air heat pump. When we use the heat in the air to heat water, we call that heat pump an air-to-water heat pump. 2.1. Air to Air Heat Pumps An air-to-air is used for comfort cooling and heating. • In the winter, a heat pump extracts heat contained in the outdoor air and delivers it inside the occupied space. • On hot summer days, it works in reverse, extracting heat from the occupied space and pumping it outdoors to cool the house. Most of Air to Air heat pumps are so called split-system, meaning that the heat is absorbed at one place and released at another location. Split system consists of two heat transfer surfaces. One coil or heat transfer surface is located inside the structure, while the other is located outside the structure. These surfaces are referred to as the condenser and the evaporator. The evaporator absorbs heat, while the condenser is responsible for rejecting heat. The function of the heat transfer surfaces can be changed to produce the desired mode of system operation. So, the indoor and outdoor coils can function as either the condenser or the evaporator, depending on the mode it’s operating in. The schematic below shows the main components and the arrangement. 16

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