What is the meaning of bypass factor?
Bypass factor is the percentage of air that travels through a tube and fin coil without touching any coil surface. Upvote (1) Answer added by MD GOUSE AHMED, Mechanical Engineer , Commodore MEP. The percentage or amount of air which does not touch or bypass cooling or heating coil in its way.
How is bypass factor calculated?
Formula for by pass factor – Thermodynamics
- a. Bypass Factor = (Td3 – Td2) / (Td3 – Td1)
- b. Bypass Factor = (Td3 – Td1) / (Td3 – Td2)
- c. Bypass Factor = (Td2 – Td1) / (Td2 – Td3)
- d. Bypass Factor = (Td2 – Td3) / (Td2 – Td1)
What are four factors that affect coil bypass factor?
Factors affecting BPF:
- The number of fins provided in a unit length i.e. the pitch of the coil fins. The smaller the pitch, greater will be the number of fins per unit length coming in direct contact with the air and hence BPF decreases.
- The number of rows in a coil in the direction of flow.
- The velocity of flow of air.
What is the bypass factor for heating coil if?
Bypass factor (BPF): It is defined as the ratio of loss in cooling or heating to the ideal cooling or heating. It is denoted by X. In the above-mentioned process, X = T 2 − T s T 1 − T s = ω 2 − ω s ω 1 − ω s = h 2 − h s h 1 − h s where Ts is the surface temperature of the coil.
Which by pass factor is possible?
BPF can also be defined as the ratio of air which is unaffected by the coil to the total quantity of air passing over the coil. Dehumidification is removal of water vapour from air. This process is possible when air is passed over a cooling coil which is at a temperature below the dew point temperature of entering air.
What is winter air conditioning?
In the winter air conditioning system, the cooling coil is made inoperative and the heating coil operates to heat the air. The spray type humidifier is also used in the dry season to humidify the air.
Why cop of AC is more than refrigerator?
The heat rejected to the hot sink is greater than the heat absorbed from the cold source, so the heating COP is greater by one than the cooling COP. applies to air conditioners and refrigerators. Measured values for actual systems will always be significantly less than these theoretical maxima.
What is bypass factor and contact factor?
Contact Factor is the part of the total air through the coil which comes in to ‘contact’ with the surface of the cooling coil. Bypass Factor is part of the total air through the coil which fails to come into contact with the surface of the cooling coil.
Which of the following does not affect by bypass factor?
Which of the following does not affect the by-pass factor? Explanation: The weight of the apparatus has nothing to do with the by-pass factor. Pitch of the coil does affect the by-pass factor. And the velocity of air as well as fin spacing affects the by-pass factor.
How do you reduce by pass factor?
The bypass factor increases with the increasing velocity of air passing through it because less time air contact with the coil. It decreases with a decrease in fin spacing and increases in the number of rows because of more time of air in contact with the coil. The bypass factor also depends on the placing of the coil.
Which of the following does not affect bypass factor?
6. Which of the following does not affect the by-pass factor? Explanation: The weight of the apparatus has nothing to do with the by-pass factor. Pitch of the coil does affect the by-pass factor.
Can we use AC as heater?
The answer is a most definitive yes. In the case of a reversible air conditioner or ductless heat pump, it makes sense to use the air conditioner all year round and enjoy the heating function. In fact, ductless heating systems come with a lot of advantages.
What is the bypass factor in air conditioning?
Bypass factor is the percentage of air that travels through a tube and fin coil without touching any coil surface. Home Science Math and Arithmetic History Literature and Language
Which is the correct definition of the bypass factor?
BPF can also be defined as the ratio of air which is unaffected by the coil to the total quantity of air passing over the coil. By-Pass factor: The inability of a coil to cool or heat the air to its temperature is indicated by a factor called by-pass factor (BPF) or Coil Bypass Factor.
What makes a cooling coil have a higher bypass factor?
An unclean cooling coil will have higher bypass factor. A choked cooling coil (muck/ dust deposited over years of operation and lack of care) will result in higher bypass factor as air will not be able to contact coil but will be held back by the muck deposited.
How to calculate bypass factor for coil SHR?
This can be calculated using the known apparatus dew point. The bypass factor formula is as follows: Bypass Factor = (Supply Air Temperature – Apparatus Dew Point) ÷ (Mixed Air Temperature – Apparatus Dew Point) Bypass Factor = (57 – 53.5) ÷ (79.4 – 53.5)