Air humidity chart psychrometer is an instrument to measure the amount of moisture in the air. Equipment used by the company to build a house บริษัทรับสร้างบ้าน and electricians often use It consists of two temperature measuring bulbs, one of which is dry type. (Without any moisture), the other is ventilated with humid outdoor air. Both are at the same air temperature. but the one that receives moisture from
Outside, the temperature will be lower than the dry one. The temperature difference between the dry bulb and the bulb is converted to the relative humidity. And the air humidity chart shows the relationship between the dry-bulb and up-bulb readings in the psychrometer. with the relative humidity absolute humidity and the temperature at which water vapor condenses, mechanical engineers use air humidity charts. To help determine the amount of heat that must be supplied or removed from the indoor space by HVAC method to create a comfortable air condition for the building occupants.
- Dew Point is the temperature at which water vapor in the air will condense into water droplets.
- Air characteristics that make it comfortable for the body.
- Effective temperature shows the overall effect of atmospheric temperature, relative humidity, and wind on the human body’s sensation of cold. It is equal to the dry bulb temperature that makes the air relative humidity 50% and there is no wind, but it can also result in the feeling of heat and cold in the human body.
- The bulb temperature rises.
- Humidity ratio is the value between the amount of water vapor in the air. (in grains) per 1 lb of dry air (1 lb = 7,000 grains)
- Enthalpy is the total heat in any material. This is equal to the energy inside the material plus the product of the volume and the pressure inside the material. The enthalpy of air is equal to the contact heat of air in which water vapor is present. plus the latent heat of steam The enthalpy is expressed in Btu per pound of dry air (2.326 Btu/lb = 1 kJ/kg).
- Heat by adiabatic process is the process by which a material or system is heated up without heat transfer into or out of that material or system. The higher the temperature is due to the excessive amount of water vapor present until condensation occurs. and die latent heat in the condensation freckle This latent heat becomes contact heat, causing the system temperature to rise.
- Evaporative cooling is the process of lowering a material or system to a lower temperature. without transferring heat into or out of that material or system The lower temperature is caused by the evaporation of water to form water vapor in the air. which the heat will be absorbed into the latent heat into the steam lower the temperature of the system
- MRT is the average temperature of the surrounding materials in the system such as walls, floors, ceilings, as shown in the figure for the calculation of the MRT values of the surrounding walls, the weight of the radiation from each wall is unequal. It depends on the angle being acted on and the point being measured.
Air conditioning system for cooling and heating
Choose the location, direction and materials used to build the house รับสร้างบ้าน . It should have characteristics to reduce heat loss inside the building to the outside in winter. This, in turn, must reduce the heat from the outside in the summer. However, the excessive amount of heat loss of the building must be balanced in the indoor climate to achieve a sharp level of temperature conditions. The comfort that the body needs However, passive energy systems or refrigeration and heating systems may be used for indoor air conditioning systems. In general, the most basic method of using a controlled air conditioner to keep the indoor temperature at a reasonable temperature. But it should consider three factors that affect the comfort of the human body, namely, relative humidity. The average temperature of radiation and the wind speed
- Relative humidity can be controlled with a condenser. or by ventilation
- The average temperature of the radiation. It can be raised using a radiant heating plate and lowered by a radiant cooler.
- The air velocity can be controlled by means of ventilation through the openings or by using a vacuum.
Cooling and heating of buildings
- The air temperature is controlled by the heat conduction flow. or cooling through the area that needs air conditioning Such fluids are hot-cold air. or hot water – cold water
- Hot air from the fireplace. Hot water and steam can be heated from the boiler. electric heater It uses a resistance to convert energy from electricity to heat.
- Size of the cooler or heat. It is determined by the projected cooling or heat consumption.
Primitive biofuels, such as gas, oil and coal, are the traditional fuels that are still most popularly used to power air conditioning systems. collect but will be sent to the gas pipe Gas-fired fuels also burn completely. But it is slightly more expensive than natural gas. The fuel provides high combustion efficiency. but needs a truck to transport it to a storage tank near the user source. Coal is rarely used in modern homes. but also used in some types of industrial plants
Compared to other energy, electric power is clean energy. because there is no burning No place for containment is required. and also has a compact form Electricity is delivered through wires or electrical equipment, which is small compared to other forms of fuel delivery systems. It also powers the appliances without causing noise. The use of electricity is quite expensive. and must also be produced from other energy sources.