(a) List out the classification of air-condition (b) With the aid of following sketch diagra details of the loops involved in the centra
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- (c) Explain the lay out and the basic operation of a centralized air conditioning system (or chiller system).Explain why the outside air damper is typically never completely closed, even when the outside air conditions are not adequate to provide free-cooling.2. With the aid of suitable sketch diagram(s), explain the working principle of air-water HVAC system and give two examples of its application.
- Detail the control system configuration with suitable justification for forced draft Cooling Tower. I want full answer without plagiarismAn air conditioning system is designed under the following conditions Outdoor conditions; 30°C dbt, 75% RH Required indoor conditions; 22°C dbt, 70% RH Amount of free air circulated; 3.33 m/sec Coil dew point temperature; 14°C The required condition is achieved first by cooling and dehumi dification and then by heating. Estimate (1) Capacity of cooling coil intons and its efficiency. (ii) Capacity of heating coil in kW. ii) Amount of water vapour removed kg/sec.Help provide a mathematical model of each of the air conditioning components of the system and the key equations describing their performance. -Precooler -Primary Heat Exchanger -Flow Control Valve -Compressor
- 11. Five large hotels in Miami, USA, use their own air-conditioning units, which have a c.o.p. 3.1. It is proposed that the cooling systems of the five hotels be substituted with a larger, modern unit that would have a c.o.p. 3.7. The total installed capacity of the five hotels is 2,600 tons of air-conditioning and the current systems are in use for 3,200 hours every year. Determine: a) the annual energy savings from this substitution and b) the annual avoidance of CO₂ emissions if, currently, 72% of the electric energy in the Miami area is obtained from coal power plants and 28% from nuclear power plants.Problem 3 For the system to the right, why would we want to heat the hot water heater using the HVAC system, rather than more traditional methods (such as burning natural gas)? Home inside nir temp: 20°C hot wnter henter - 10 liters imax temp: 50'C) Subrooler (autside air temmp: 32°C) R14a refrigerant PJ P2 sat. Hquid Qhot-water P2= OF 16 MPa T2=70°C P4-P2 Throttle (adinbatic) Compressor ladiabatic) Fan PS = P13 Pl=400 Pa at vapor air flow Tair =-10°CDefine the term "low-cost air conditioning". State the ways in which it can be achieved.
- A R22 refrigeration system is used to operate between 45degC and -30degC. The total cooling capacity is 350 kW. a. What is the ideal COP of the system? b. What is the heat rejected by the system? c. What is the total power consumed by the system? There are several steps made to improve the performance of the system. What happens to the COP, heat rejected and power consumed by the system when: d. For the same evaporator and condenser pressure, the temperature at the entrance of the compressor is -20degC, and the inlet to the expansion valve is subcooled by 5degC. Due to the wide temperature gap, it is decided to use a two-stage refrigeration system using flash gas removal and optimal intercooling operation in a flash chamber. What happens to the COP, heat rejected and power consumed by the system when: e. Having a low pressure and high-pressure compression. f. Two evaporators and two compressors, with the lower temperature evaporator having a cooling capacity of 225 kW. Notes: The…Which component is primarily responsible for the pressure in a cooling system? Select one: a. The thermostat b. The water pump c. The radiator cap d. The surge tankI. ESSAY/ ENUMERATION 1. GIVE ATLEAST 5 ADVANTAGES AND 5 DISADVANTAGES OF INORGANIC REFRIGERANTS. 2. HOW DOES A REFRIGERANT WORKS IN A REFRIGERATION SYSTEM? 3. DIFFERENTIATE POSITIVE AZEOTTROPES AND NEGATIVE AZEOTROPES IN TERMS OF THEIR APPLICATION IN REFRIGERATION SYSTEMS. 4. THE FOUR MAIN COMPONENTS OF A REFRIGERATION SYSTEM ARE COMPRESSOR, CONDENSER, EVAPORATOR AND AN EXPANSION VALVE. EXPLAIN BRIFLY THE FUNCTION OF EACH COMPONENT AND THE FLOW OF THE CYCLE.