Heating, Ventilating and Air Conditioning Analysis and by Faye C. McQuiston

By Faye C. McQuiston

In line with the latest criteria from ASHRAE, the 6th variation presents entire and updated assurance of all elements of heating, air flow, and air con. you will find the newest load calculation methods, indoor air caliber approaches, and concerns relating to ozone depletion. additionally built-in through the textual content are a variety of labored examples that basically aid you follow the strategies in real looking scenarios.The revision of this article maintains to supply accomplished therapy of heating, air flow, and air con options: All fabric relies at the up to date ASHRAE guide and product standards and makes use of either SI and English devices. functional, sensible difficulties are offered and the newest strategies and matters are lined. compatible for complicated research in HVAC mechanical engineering, architectural engineering, and mechanical engineering know-how departments.

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By Faye C. McQuiston

In line with the latest criteria from ASHRAE, the 6th variation presents entire and updated assurance of all elements of heating, air flow, and air con. you will find the newest load calculation methods, indoor air caliber approaches, and concerns relating to ozone depletion. additionally built-in through the textual content are a variety of labored examples that basically aid you follow the strategies in real looking scenarios.The revision of this article maintains to supply accomplished therapy of heating, air flow, and air con options: All fabric relies at the up to date ASHRAE guide and product standards and makes use of either SI and English devices. functional, sensible difficulties are offered and the newest strategies and matters are lined. compatible for complicated research in HVAC mechanical engineering, architectural engineering, and mechanical engineering know-how departments.

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Additional info for Heating, Ventilating and Air Conditioning Analysis and Design; 6 edition

Example text

This technique is used to identify thermal bridges or areas of reduced thermal insulation, and therefore higher surface temperatures where heat is being lost to the outside of the building 24 Case study Effects of different forms of glazing on energy consumption Experiments on the comparative energy consumption of houses with single, double and heat reflecting glazing were carried out in the BRE ‘matched house pairs with simulated occupancy’. The pairs of semidetached houses were heated intermittently with gas fired boilers and radiators controlled by thermostatic radiator valves.

The design of this house and its services ensures that as small a contribution as possible is made to the problem of global warming. 11 Kitchens are among the worst locations for the production of condensation, usually from cooking, particularly in older properties where both heating and ventilation provision are inadequate. Persistent condensation leads to mould growth. In this particular case it seems as though additional factors, such as thermal bridging at ceiling level (seen as a differential pattern of mould growth) and poor air circulation (which has led to the crescent shaped pattern of mould on the ceiling at the far corner), may be partly to blame :KLOHFRQGHQVDWLRQLQLWVHOIPD\QRW JLYHULVHWRPRUHWKDQDWHPSRUDU\ QXLVDQFHWKHPRXOGJURZWKZKLFK RIWHQDFFRPSDQLHVSHUVLVWHQW FRQGHQVDWLRQLVPRUHOLNHO\WRJLYH VHULRXVFRQFHUQ 7KHWZRPRVWFRPPRQVLWXDWLRQV LQZKLFKFRQGHQVDWLRQRFFXUVRQWKH YHUWLFDOH[WHUQDOHQYHORSHDUH ● VLQJOHJOD]HGZLQGRZV ●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± UHDVRQDEOHKHDWLQJDQGYHQWLODWLRQ 30 Case study Condensation on the walls of a 1920s terrace house BRE investigators were presented with a problem of mould growing on the inside faces of the external walls in bedrooms and bathroom.

11 Kitchens are among the worst locations for the production of condensation, usually from cooking, particularly in older properties where both heating and ventilation provision are inadequate. Persistent condensation leads to mould growth. In this particular case it seems as though additional factors, such as thermal bridging at ceiling level (seen as a differential pattern of mould growth) and poor air circulation (which has led to the crescent shaped pattern of mould on the ceiling at the far corner), may be partly to blame :KLOHFRQGHQVDWLRQLQLWVHOIPD\QRW JLYHULVHWRPRUHWKDQDWHPSRUDU\ QXLVDQFHWKHPRXOGJURZWKZKLFK RIWHQDFFRPSDQLHVSHUVLVWHQW FRQGHQVDWLRQLVPRUHOLNHO\WRJLYH VHULRXVFRQFHUQ 7KHWZRPRVWFRPPRQVLWXDWLRQV LQZKLFKFRQGHQVDWLRQRFFXUVRQWKH YHUWLFDOH[WHUQDOHQYHORSHDUH ● VLQJOHJOD]HGZLQGRZV ●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± UHDVRQDEOHKHDWLQJDQGYHQWLODWLRQ 30 Case study Condensation on the walls of a 1920s terrace house BRE investigators were presented with a problem of mould growing on the inside faces of the external walls in bedrooms and bathroom.

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