B.TECH - Semester 7 refrigeration and air conditioning Question Paper 2008 (dec)
Practice authentic previous year university questions for better exam preparation.
- The following data relate to an air-conditioned space: Outer condition - $38^{\circ} \mathrm{C}$ DBT, $50 \% \mathrm{RH}$ Room condition - $24^{\circ} \mathrm{C}$ DBT, $50 \% \mathrm{RH}$ Sensible heat load ...... 24 kw Least heat load - 6kW By-pass factor of the cooling coil 0.16 If the ventilati...
- The following data relate to an air-conditioned space: Outer condition - $38^{\circ} \mathrm{C}$ DBT, $50 \% \mathrm{RH}$ Room condition - $24^{\circ} \mathrm{C}$ DBT, $50 \% \mathrm{RH}$ Sensible heat load ...... 24 kw Least heat load - 6kW By-pass factor of the cooling coil 0.16 If the ventilati...
- (a) Explain the working of steam jet Refrigeration system.
- (b) What are the properties of Ideal Refrigerant- absorbent combination?
- (i) Ammonia (R-717) (ii) $\quad \mathrm{CO}_{2}(\mathrm{R}-744)$ (iii) Freon-12 $\left(\mathrm{CCl}_{2} \mathrm{~F}_{2}\right)$
- (i) Temperature to which air should be heated; (ii) Efficiency of the air washer.
- Define the term Refrigeration?
- What are the advantages of cascading?
- What is refrigerating effects? Can water be used as a Refrigerant?
- Define Electrolux refrigerator.
- Explain C.O.P.
- Give some examples of mixed refrigerants,
- What is an hygrometer?
- What are the basic elements of an air-conditioning system?
- Define RSHF.
- What is apparent dew point temperature? ( $10 \times 4=40$ Marks) PART - B Module - 1
- An ice plant working an a reversed carrot cycle heat pump produces 15 tonnes of ice per day. The ice is formed from water at $0^{\circ} \mathrm{C}$ and the formed ice is maintained at $0^{\circ} \mathrm{C}$. The heat is rejected to the atmosphere at $25^{\circ} \mathrm{C}$, The heat pump used to run...
- A refrigerating plant works between temperature limits of $-5^{\circ} \mathrm{C}$ and $25^{\circ} \mathrm{C}$. The working fluid ammonia has a dryness fraction of 0.62 at entry to compressor. If the machine has a relative efficiency of $55 \%$, calculate the amount of ice formed during period of 24 ...
- (a) Explain the simple vapor absorption system.
- (b) Air at $12^{\circ} \mathrm{C}$ DBT and $85 \% \mathrm{RH}$ is to be brought to $36^{\circ} \mathrm{C}$ DBT and $23.2^{\circ} \mathrm{C}$ WBT with the help of winter air-conditioner. If the humidified air comes out of the humidifier at $85 \% \mathrm{RH}$, draw the various processes involved on a...
- The following data relate to an air-conditioned space: Outer condition - $38^{\circ} \mathrm{C}$ DBT, $50 \% \mathrm{RH}$ Room condition - $24^{\circ} \mathrm{C}$ DBT, $50 \% \mathrm{RH}$ Sensible heat load ...... 24 kw Least heat load - 6kW By-pass factor of the cooling coil 0.16 If the ventilati...
- The following data relate to an air-conditioned space: Outer condition - $38^{\circ} \mathrm{C}$ DBT, $50 \% \mathrm{RH}$ Room condition - $24^{\circ} \mathrm{C}$ DBT, $50 \% \mathrm{RH}$ Sensible heat load ...... 24 kw Least heat load - 6kW By-pass factor of the cooling coil 0.16 If the ventilati...
- The following data relate to an air-conditioned space: Outer condition - $38^{\circ} \mathrm{C}$ DBT, $50 \% \mathrm{RH}$ Room condition - $24^{\circ} \mathrm{C}$ DBT, $50 \% \mathrm{RH}$ Sensible heat load ...... 24 kw Least heat load - 6kW By-pass factor of the cooling coil 0.16 If the ventilati...
- (b) What are the properties and uses of the following refrigerants?
- (a) Explain the air-conditioning cycle with a neat sketch.
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