ENVE 4105 Lecture Notes - Lecture 9: Vapor-Compression Refrigeration, Heat Pump, Cool Air
19 Jan 2016
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Document Summary
Variety of types that are typically customized to suit specific application. Hvac equipment usually takes up to 4-9% of gba (gross building area) Core zones have relatively constant thermal loads. Perimeter zones can have highly-variable thermal loads because of their exposure to the. It is possible to have simultaneous heating and cooling needs (but it is very inefficient) Heating equipment is generally given as a % efficiency (ratio of thermal energy output to. Cooling equipment and heat pumps are given a cop. Normally, the plant equipment has a non-constant efficiency and is given a part-load efficiency energy input) curve. Coefficient of performance (cop) indicates the ratio of thermal energy output to electrical. It"s like efficiency, but efficiency is < 1. Cop heating is higher than cop cooling. Normally, equipment operates at a lower efficiency if it is at a part load (i. e. not 100% Oversizing a system means it never operates in the efficient (full load) efficiency.
