The following basic concepts are good things to keep in mind when designing (or evaluating the performance of) a system:
1. As the outdoor design temperature goes up, the cooling capacity of the AC unit goes down (and the load on the house goes up). This is because the outdoor air is the heat sink used by the air conditioner to dump the heat into that is extracted from the indoor air. As the outside air gets warmer, it is harder for the air
conditioner to dump heat into it.
2. As the indoor dry bulb temperature goes down, the cooling capacity goes down. This is because it is harder to extract heat from colder air.
3. As the indoor wet bulb temperature goes down, the cooling capacity goes down. This is because the air has more moisture in it and cooling capacity is used up when this moisture is condensed out of the air.
4. As the airflow across the coil goes down, the cooling capacity goes down. This is because with less air passing across the coil, there is less opportunity for the coil to extract heat from the air stream.
1. As the outdoor design temperature goes up, the cooling capacity of the AC unit goes down (and the load on the house goes up). This is because the outdoor air is the heat sink used by the air conditioner to dump the heat into that is extracted from the indoor air. As the outside air gets warmer, it is harder for the air
conditioner to dump heat into it.
2. As the indoor dry bulb temperature goes down, the cooling capacity goes down. This is because it is harder to extract heat from colder air.
3. As the indoor wet bulb temperature goes down, the cooling capacity goes down. This is because the air has more moisture in it and cooling capacity is used up when this moisture is condensed out of the air.
4. As the airflow across the coil goes down, the cooling capacity goes down. This is because with less air passing across the coil, there is less opportunity for the coil to extract heat from the air stream.
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