In an air-conditioning process, 5kJ/min heat is extracted from a room. If the sensible heat factor is 0.8, then the latent heat extracted will be

Water in an insulated evaporative cooler evaporates at the rate of 0.003 kg/s. Air flow rate is 1kg/s. What is the air temperature decrease if the specific heat of humid air is 1kJ/kg K and latent heat of water is 2500 kJ/kg?

The expression$\frac{0.622P_v}{P_b-P_v},$  where P_v = partial pressure of water vapour; P_b= atmospheric barometric pressure, is used for calculating

Air-conditioning has to be done for a hall whose RSH = 50 kW and RLH = 50 kW. There are no other sources of heat addition or leakages. What is the value of the RSHF?

The atmospheric air at 760 mm of Hg, dry bulb temperature 15°C and wet bulb temperature 11⁰ C enters a heating coil whose temperature is 41°C. If the by-pass factor of the heating coil is 0.5, then what will be the dry bulb temperature of the air leaving the coil?

In the case of sensible cooling of air, the coil efficiency is given by (BPF = Bypass factor)

The sensible heat factor of a room is given by (S.H.L = Sensible heat load and L.H.L. = Latent heat load)

Consider the following statements:

In chemical dehumidification process

1. Dew point temperature decreases.

2. Wet bulb temperature decreases

3. Dry bulb temperature increases.

Of these statements

A single-acting two-stage compressor with complete inter cooling delivers air at 16 bar. Assuming an intake state of 1 bar at 15°C, the pressure ratio per stage is:

Consider a two stage reciprocating air compressor with a perfect intercooler operating at the best intermediate pressure. Air enters the low pressure cylinder at 1bar, 27°C and leaves the high pressure cylinder at 9 bar. Assume the index of compression and expansion in each stage is 1.4 and that for air R = 286.7 J/kg K, the work done per kg of air in the high pressure cylinder is:

Clearance volume of a reciprocating compressor is 100 ml, and the volume of the cylinder at bottom dead center is 1.0litre.The clearance ratio of the compressor is:

The usual assumption in elementary compressor cascade theory is that  

In a centrifugal compressor assuming the same overall dimensions, blade inlet angle and rotational speeds, which of the following blading  will given the maximum pressure rise?

The flash chamber in a single stage simple vapour compression cycle

Consider the following characteristics:

1. The fluid enters the pump axially and is discharged radially.

2. Maximum efficiency may be of the order of 90%.

3. Development of a low head

4. A limited suction capacity

Which of the above characteristics are possessed by axial flow pumps?

The coefficient of performance (COP) of a refrigerator working as a heat pump is given by:

An industrial heat pump operates between the temperature of 27⁰C and-13⁰C. The rates of heat addition and rejection are 750 W and 1000 W, respectively. The COP for the heat pump is:

A Carnot cycle refrigerators operate between 250K and 300 K. Its coefficient of performance is:

In the case of a refrigeration system undergoing an irreversible cycle.${\displaystyle \oint \frac{\delta Q}{T}}$      

A heat pump works on a reversed Carnot cycle. The temperature in the condenser coils is 27⁰ C and that in the evaporator coils is -23⁰C. For a work input of 1 kW,  the COP of  heat pump is  

A heat pump for domestic heating operates between a cold system at 0^oC and the hot system at 60^oC.What is the minimum electric power consumption if the heat rejected is 8000 kJ/hr?

Assertion  (A): If a domestic refrigerator works inside an adiabatic room with its door open ,the room temperature gradually decreases.

Reason (R): Vapors compression refrigeration cycles have high COP compared to air refrigeration cycles.

The thermal efficiency of a Carnot heat engine is 30%. If the engine is reversed in operation to work as a heat pump with operating conditions unchanged, then what will be the COP for heat pump?    

A heat pump working on a reversed Carnot cycle has a C.O.P of 5. If it works as a refrigerator taking 1 kW of work input ,the refrigerating effect will be ;

A refrigerator works on reversed Carnot cycle producing a temperature of – 40 ^OC. Work done per TR  is 700 kJ per ten minutes. What is the value of its COP ?