Describe and compare the following HVAC systems. How do they differ in function and what are the...

Question

Describe and compare the following HVAC systems. How do they differ in function and what are the relative advantages and disadvantages of the systems. Graphically represent each system with a sketch.

a) All-air systems

b) All-water systems

Air-water systems

David · Accepted Answer

Assignment : TTs280817_604879_17 
Describe and compare the following HVAC systems. How do they differ in function and what 
are the relative advantages and disadvantages of the systems. Graphically represent each 
system with a sketch. 
c) Air-water systems 
Solution:  
The selection of air conditioning system is mainly dependent on the fluid medium that is used to transfer 
energy from conditioned space to air conditioning plant. 
a) All-Air Systems: 
In all air system, air is the fluid medium that is used for transferring energy in thermal distribution 
system. In the system, the processing of air takes place in the air conditioning plant and the air is then 
transferred to the conditioning space via insulated ducts by using appropriate fans and blowers. In case 
of summer, the specified amount of sensible and latent heat in air is extracted from the conditioning 
space while in case of winters, the heat is supplied in the conditioning space. The air returning from the 
conditioned space is transferred back to the plant. The air is again processed which completes the cycle.
Working :  
i. Outdoor air (OD) and recirculated air (RC) are mixed in appropriate ratios by using dampers. 
ii. This air is then allowed to pass through cooling and dehumidifying coil, a heating coil and a 
humidifier using an insulated ducting and a supply fan as shown in fig above. 
iii. The moisture content and  temperature of the air is controlled to their required values as it 
flows through the coils with the help of Thermostat (T) and humidistat (H). 
a) All-air systems 
b) All-water systems 
iv. This air is then transferred in the conditioned space where it satisfies the cooling or heating 
requirement.  
v. The part of the air from this conditioned space returns as a part of recirculated air and the 
remaining part leaves to the atmosphere.
b) All-Water Systems : 
In all water system,

Describe and compare the following HVAC systems. How do they differ in function and what are the relative advantages and disadvantages of the systems. Graphically represent each system with a sketch....

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