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What is Air?

Temperature of air conditioners is a heat pump. It transfers heat from the low temperature (heat source) to high temperatures (where the heat), in contrast to the natural heat transfer. In hot climates year round as South Vietnam, the machine DHND heat pump only in one direction only from the outside in, so often referred to as air conditioning. In northern Vietnam, machine DHND heat pumps in two directions: from the summer heat pump indoor, outdoor winter outdoor heat pump from inside the house. DHND only limited work machine where heat is not hot when over 48 ° C and cold heat source is not more than 5 ° C; exceed that limit, the machine does not heat pumps are DHND. Thus, when the outdoor air conditioning heat about 48 ° C, then the cost of electricity to no avail. Similarly, if the outdoor temperature in winter is lower than 5 ° C, then open DHND machine is useless. Some DHND will stop working automatically when it detects conditions that limit. When outdoor air temperature to 48 ° C but not hot rig was not enough sun shines or vent should open to heat up, so it would be a sun and breathable for hot rig. Capacity and performance of the machine capacity DHND usually written in units of Btu / h. British thermal unit (Btu or BTU): the energy required for 1 pound (454g) of water increases by 1 ° F. ≈ 1Btu 1055J = 0.293 Wh. DHND smallest machines are common in Vietnam with a capacity 9.000Btu / h (≈ 2.6375 KW) and commonly known as a horse (sic). In other countries have sold machines DHND smaller (about 4,000-5.000Btu / h just enough for a room of about 45m ³ or 15m ²). Probably recorded in Btu / h shall have better numbers 9000 KW of 2.6375 should be indicated by manufacturer Btu / h, although most consumers do not know Vietnam Btu / h is. It’s amazing how many people (including those in Southeast Asia and the U.S.) used to indicate the unit horse power air conditioning, a horse equivalent 9.000Btu / h, although none showed an association between a HP and 9.000Btu / h. Another unit is related to air ton of REFRIGERATION (refrigeration tons), which is the amount of heat to melt one short ton (907KG) divided by the number of seconds of ice per day, equivalent to one ton of refrigeration 12.000Btu / h. Total Btu / h is the heat transfer capacity between the two parts of the machine DHND not electric power consumption of the machine. Power consumption of machine DHND 9.000Btu / h about 0.97 KW; machine’s performance is about 2.72 times. Better machine than the low-power consumption performance can be up to more than 3 times. Machine (capacity) greater than usually higher performance. The air conditioner inverter air conditioner most new inverter circuit, to adjust to reduce capacity, only a pleasant feeling to the user rather than saving machines often seem to be advertised. By reducing the capacity should have reached the chosen temperature, air will reduce the power inverter so that the heat pumped out by the same amount of heat transmitted into the room and was born in the room, so room temperature will not change, very pleasant to the user. What kind of air pump will usually stop when has reached the selected temperature, and external heat transfer into the room as well as born in the room as the room temperature will rise slowly; as the temperature rises higher than the temperature chose a level, air conditioning heat pump will start again with its fixed capacity; so room temperature will rise and fall regularly around the selected temperature. Although room temperature is only 1 degree change, but sensitive people will feel very uncomfortable. An air drying side effects of the air conditioning is to reduce humidity in the room, making people feel more comfortable. Relative humidity is suitable for people in about 30% to 60%. Most of today’s air conditioners are air drying mode. But it does reduce the amount of water vapor in the air but it does not have the humidity gauges, there is no way to control relative humidity. So it only works in a fixed cycle is run the pump for several minutes and then stop pumping for a few minutes. In the minutes running pumps, water vapor in the air is cooled in the machine will condense and drain away from the pipe room. Ratio between the runtime and downtime pump with temperature changes on the user selects a remote control. With an inexpensive hygrometer from China (hygrometer and thermometer metal, plastic, ₫ 50,000), we can easily see the side effects of air conditioning. Relative humidity during the rainy season in Saigon about 65% change in the sun at noon to 100% in the early morning. In the morning hours, the outdoor relative humidity around 70%, in the office with many computer-heat and air conditioning should be run continuously and the room temperature about 26-28 ° C, humidity about 45-60%. After 10 pm, the outdoor relative humidity around 80%, air conditioner running dry mode air conditioning reduces humidity down only about 70%. Using the wrong! Many people mistakenly use an air conditioner that is lower than the temperature selected on the remote control (DKTX) will make it run more powerful (increased capacity) and room cooler colors. As seen in the room cool someone would just grab the handle and select DKTX to 16 ° C! They do not know that the air conditioning capacity is limited, while in the room is cool enough not enough air for cooling the room, even for selected temperature of 25 ° C or 16 ° C also can not change the temperature fact. In the case of fully air-conditioned room cooling capacity, it also needs 15-30 minutes to reduce the temperature in the room, many people open it up is not that cool a few minutes he took the DKTX and choose colors to 16 ° C for cooling ! That was the wrong way, even for selected temperature of 25 ° C or 16 ° C, the color is not room cooler. In this case, the selected temperature was 16 ° C is itself troubling then the bird takes DKTX to increase the temperature up and the machine had spent no less power to cool the room too much. All of these habits is wrong because the user does not understand the nature of DHND machine. Machine DHND unlike electric fan. We can see an immediate difference when adjusting fan speed, but we can not see an immediate difference in temperature when DHND machine. Ministry DKTX made people less used to the limbs, making the user even misunderstand the nature of the machine! Acquaintances in the tropics will definitely feel comfortable in temperatures around 25-27 ° C, air-conditioned place below 25 ° C is the electric charge and can even cause disease.