BUILDING SERVICES AND ENVIRONMENTAL SCIENCE
Student no: 3318911
• Human thermal comfort is ultimately dependent upon six simple parameters that can be easily measured and assessed for any individual in any particular environment. This allows us to design buildings within which all occupants will be thermally comfortable.
The aim of a building, either dwellings or commercial buildings is to offer shelter and a different climate from the world outside . One of the factor to consider to build a favourable place to work or live is the thermal comfort. The thermal comfort is 'that condition of mind which expresses satisfaction with the thermal environment ' (ANSI/ASHRAE, 2013), in other words means that people in that environment are not feeling …show more content…
Every piece of garment that people use has a particular insulation that is expressed with a particular scale: the clo-value. 1 clo represent 0.155 m2K/W of insulation and the clo scale has a range between 0 and 4, generally 1 clo represents the insulation given by a jumper or a dress (underclothing are included) and the typical comfort temperature while seated (1 met) for who is dressed with a jumper or a dress is 25ºC. When calculating the insulation of a garment it is to consider also where people stay when they are in that particular environment, for example if a person spend most of his time in that building seated in a chair (like in a office) it is also to consider the insulation given by that chair.. Air temperature and mean radiant temperature are two out of four environmental variables, the first is the average temperature of the bulk of air inside a room, the second one is the average effect of radiation from surrounding …show more content…
The last environmental factor influencing the thermal comfort is the humidity. The humidity is caused by the moisture in the air and can be expressed as absolute humidity and relative humidity. For comfortable condition a relative humidity (RH) within the range of 40% to 70% is required.
If humidity is too high at high temperature the natural cooling capacity of the body is decreased, if instead the humidity is high and temperature is low the air will be felt chilly. Low humidity instead can cause dryness of throat and skin and help the accumulation of static electricity.
With the functions of the operating temperature and humidity together with the function of the dew point (temperature at witch a fixed sample of air becomes saturated) combined in the next graph (ASHRAE Standard 55) it shown the comfort zone or when the PMV is between -0.5 and +0.5 for winter (right hand side) and summer (left hand side). (Temperature shown with degrees
Student no: 3318911
• Human thermal comfort is ultimately dependent upon six simple parameters that can be easily measured and assessed for any individual in any particular environment. This allows us to design buildings within which all occupants will be thermally comfortable.
The aim of a building, either dwellings or commercial buildings is to offer shelter and a different climate from the world outside . One of the factor to consider to build a favourable place to work or live is the thermal comfort. The thermal comfort is 'that condition of mind which expresses satisfaction with the thermal environment ' (ANSI/ASHRAE, 2013), in other words means that people in that environment are not feeling …show more content…
Every piece of garment that people use has a particular insulation that is expressed with a particular scale: the clo-value. 1 clo represent 0.155 m2K/W of insulation and the clo scale has a range between 0 and 4, generally 1 clo represents the insulation given by a jumper or a dress (underclothing are included) and the typical comfort temperature while seated (1 met) for who is dressed with a jumper or a dress is 25ºC. When calculating the insulation of a garment it is to consider also where people stay when they are in that particular environment, for example if a person spend most of his time in that building seated in a chair (like in a office) it is also to consider the insulation given by that chair.. Air temperature and mean radiant temperature are two out of four environmental variables, the first is the average temperature of the bulk of air inside a room, the second one is the average effect of radiation from surrounding …show more content…
The last environmental factor influencing the thermal comfort is the humidity. The humidity is caused by the moisture in the air and can be expressed as absolute humidity and relative humidity. For comfortable condition a relative humidity (RH) within the range of 40% to 70% is required.
If humidity is too high at high temperature the natural cooling capacity of the body is decreased, if instead the humidity is high and temperature is low the air will be felt chilly. Low humidity instead can cause dryness of throat and skin and help the accumulation of static electricity.
With the functions of the operating temperature and humidity together with the function of the dew point (temperature at witch a fixed sample of air becomes saturated) combined in the next graph (ASHRAE Standard 55) it shown the comfort zone or when the PMV is between -0.5 and +0.5 for winter (right hand side) and summer (left hand side). (Temperature shown with degrees