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3 years ago

1. Why is outside air mixed with return air?

Engineering

1 answer:

Dmitrij [34]3 years ago

3 0

Answer:

Explanation:

outside air must be mixed with return air at some point in time because here is an example a warm current of air comes in contact with a cold current of air the warm current has to cool down so it could mix with the cold current or if they don´t mix they would continue to bump into each other and probably cause a tornado. probably.

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Why do we feel chilled in the winter but comfortable in the summer under conditions for which the same room temperature is maint

pantera1 [17]

Answer:

Explanation:

We feel chilled in summer but comfortable in the summer under the same temperature because of our thermal comfort.

Thermal comfort is a function of heat loss from the body and during winter there is excessive heat loss due to heat flux.

As room temperature is fixed so summer and winter comfort cannot be attributed due to heat loss by convection. Due to differences in heat flux radiations in summer and winter there is a chilled feeling associated with winters.

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4 years ago

3. A competency-based training program is

Vesna [10]

C and B is the answer of the questions

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4 years ago

Acme Logistics provides "Less than truck load" (LTL) services throughout the U.S. They have several hubs where they use cross-do

riadik2000 [5.3K]

Answer:

The answer is "$10.12 million"

Explanation:

To find the price of the 36 dock doors only at the current rate, just use the cost index.

$C_n=C_k \times (\frac{I_n}{I_k})\\\\$

$= 6 \times \frac{195}{140} \\\\= \$ \ 8 \ million$

Its current cost of 36 dock doors is, thus, $\$ \ 8 \ million$ . To calculate the price for 48 dock doors, just use the second formula now:

$\to (\frac{C_A}{C_B})=(\frac{S_A}{S_B})^{X}\\\\\to C_A=C_B \times (\frac{S_A}{S_B})^{X}\\\\$

$=8 \times (\frac{48}{36})^{0.82}\\\\= \$ 10.12 \ million$

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3 years ago

One of the flaws in the engineers' reasoning for galloping gertie's design was that they attributed prior failures of suspension

Jlenok [28]

False i think it would be

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3 years ago

What are the basic types of heat exchangers?

liraira [26]

Answer:

The two large divisions of heat exchangers are direct contact between fluids and indirect contact between fluids.

Explanation:

A heat exchanger is one of the most used equipment at the level of thermal installations, both at the building, tertiary and industrial levels. A heat exchanger is a device designed to transfer heat between two fluids. These two fluids (liquids, gases) can be in contact or separated by a solid barrier. Its use is basic in all types of air conditioning or refrigeration, air conditioning, energy transfer or chemical processes. Heat transmission occurs through convection and conduction.

Classifying heat exchange systems can be carried out using many different criteria. When classifying different types of heat exchangers, different criteria can be taken into account. Taking into account the degree of contact between the fluids, they are grouped into two different types:

Direct Contact Heat Exchanger:

In direct contact exchangers, heat transfer occurs through a physical mixture of the fluids involved in the process. An example of this type of exchangers are the cooling towers. In this case, direct contact occurs between a stream of hot water (fluid to be cooled) using dry and colder air.

Indirect Contact Heat Exchanger :

In a direct type exchanger there is no direct contact between the fluids and they never mix. The fluids are separated by a solid barrier and may also not coincide at the same time.

Indirect contact heat exchangers can be of various types, being the most used, according to their constructive typology:

Concentric tubes or double tube .
Shell and tubes .
Of plates .
Compact heat exchangers .
Regenerators .

The concentric tube equipments are the simplest that exist since they are composed of two concentric tubes of different diameter so that one of the fluids circulates inside the smaller one and the other does it through the annular space between both tubes.

Shell and tube exchangers are widely used at an industrial level and use a housing with a multitude of tubes inside.

The equipment of plates are formed by a succession of sheets of metal, armed in a frame and separated by joints, which are fixed with a steel shell. The fluid circulates between these sheets.

5 0

4 years ago

1. Why is outside air mixed with return air?​

1. Why is outside air mixed with return air?