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...
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...
Q/ 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...