design a vapor compression refrigeration system that will
maintain the refrigerated space at -15c while operating...
design a vapor compression refrigeration system that will
maintain the refrigerated space at -15c while operating in an
environment at 20c using refrigerant -134a as the working fluid (By
EES )please
12. Which component of a vapor-compression refrigeration machine provides for the cooling effect in the conditioned space?
16. Why would one choose a fire tube boiler instead of a water tube boiler?
17. How does one de-humidify an air mass?
18. Define an HVAC zone?
The capacity of a propane vapor-compression refrigeration system
is 8 tons. Saturated vapor at 0°F enters the compressor, and
superheated vapor leaves at 120°F, 180 lbf/in.2 Heat
transfer from the compressor to its surroundings occurs at a rate
of 3.5 Btu per lb of refrigerant passing through the compressor.
Liquid refrigerant enters the expansion valve at 85°F, 180
lbf/in.2 The condenser is water-cooled, with water
entering at 65°F and leaving at 80°F with a negligible change in
pressure. Determine
(a)...
An air conditioner using refrigerant-134a as the working fluid
and operating on the ideal vapor-compression refrigeration cycle is
to maintain a space at 30°C while operating its condenser at 1000
kPa. Determine the COP of the system when a temperature difference
of 2°C is allowed for the transfer of heat in the evaporator. (Take
the required values from saturated refrigerant-134a tables.)
The COP of the system is ?
There is a vapor compression type refrigeration cycle using the
refrigerant HFC 134 a. In the condenser, it is isostatically
cooled, the condensation temperature is 50 ° C., and the condenser
outlet is the compressed liquid at 45 ° C. In the evaporator, it is
isothermally heated, the evaporation temperature is 10 ° C. and the
outlet of the evaporator is heated steam at 15 ° C. When the
expansion valve performs isenthalpic expansion, and the adiabatic
efficiency of the...
A vapor-compression refrigeration cycle working with R22 contains a liquid-to-suction heat exchanger. The saturated liquid refrigerant at 40 ℃ leaving the condenser and enteringthe heat exchanger is used to superheat the saturated vapor refrigerant leaving the evaporator at 7 ℃ by 8 ℃. If the compressor is capable of pumping 5 1/s of vapor refrigerant measuredat the inlet to the compressor and the compression processes are considered isentropic in both cases listed below, determine;
(a) The refrigerating capacity in kW,...
An ideal vapor compression refrigeration cycle using r134a as
the refrigerant is being used to cool a house. It provides 3
refrigeration tons ≈ 10.5kW of cooling (heat removal from the house
air). The refrigerant in the evaporator operates at 400kPa while in
the condenser it is at 1000kPa. Treat the surroundings as a thermal
reservoir at 33◦C and the air in the house as a thermal reservoir
at 19◦C. All reservoirs are at 100kPa.
1. What is the COPr...
An ideal vapor compression refrigeration cycle with R134a as the
working fluid operates between the pressure limits of 200 kPa and
1200 kPa. Determine
a) the mass fraction of the refrigerant that is in the liquid phase
at the inlet of the evaporator, and
b) the amount of heat transfer (in kJ/kg) to the refrigerant in
the evaporator (??).
A vapor-compression refrigeration cycle operates at steady state
with Refrigerant 134a as the working fluid. Saturated vapor enters
the compressor at 2 bar, and saturated liquid exits the condenser
at 10 bar. The isentropic compressor efficiency is 80%. The mass
flow rate of refrigerant is 7 kg/min.
Determine:
(a) the compressor power, in kW.
(b) the refrigeration capacity, in tons.
(c) the coefficient of performance.
A vapor-compression refrigeration cycle working with R22
contains a liquid-to-suction heat exchanger. The saturated liquid
refrigerant at 40 °C leaving the condenser and entering the heat
exchanger is used to superheat the saturated vapor refrigerant
leaving the evaporator at 7 °C by 8 °C. If the compressor is
capable of pumping 5 l/s of vapor refrigerant measured at the inlet
to the compressor and the compression processes are considered
isentropic in both cases listed below, determine;
(a) The refrigerating capacity...