Calculate the EER rating of a 20 ton (240000 Btu) air conditioning unit with an average electrical load of 30 kW.

Refrigeration and Air Conditioning Technology (MindTap Course List)
8th Edition
ISBN:9781305578296
Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Chapter40: Typical Operating Conditions
Section: Chapter Questions
Problem 1RQ: The standard design conditions for air-conditioning systems established by the Air-Conditioning,...
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Calculate the EER rating of a 20 ton (240000 Btu) air conditioning unit with an
average electrical load of 30 kW.
An air conditioning plant supplies air to a room at a rate of 2.5 kg/s, the supply
air being made up of equal parts by weight of outdoor and recirculated air. The
mixed air passes through a cooler coil fitted with a by-pass duct, face and by pass
dampers being used for humidity control. The air then passes through an after
heater and supply fan. In a test on the plant, the following conditions (Table Qu
4) were recorded;
3
Table Qu. 4: Parameters recorded
Relative humidity
Dry bulb
temperature
°C
Wet bulb
temperature
°C
%
Outdoor air
270
20.5
Room air
210
50
Supply air
Air leaving cooler
160
11.8
80
90
coil
Make neat sketches showing the plant arrangement and the psychrometric cycle and
identify the corresponding points on both diagrams.
Calculate the following;
mass of air through the cooler coil
load on cooler coil
load on heater
Transcribed Image Text:Calculate the EER rating of a 20 ton (240000 Btu) air conditioning unit with an average electrical load of 30 kW. An air conditioning plant supplies air to a room at a rate of 2.5 kg/s, the supply air being made up of equal parts by weight of outdoor and recirculated air. The mixed air passes through a cooler coil fitted with a by-pass duct, face and by pass dampers being used for humidity control. The air then passes through an after heater and supply fan. In a test on the plant, the following conditions (Table Qu 4) were recorded; 3 Table Qu. 4: Parameters recorded Relative humidity Dry bulb temperature °C Wet bulb temperature °C % Outdoor air 270 20.5 Room air 210 50 Supply air Air leaving cooler 160 11.8 80 90 coil Make neat sketches showing the plant arrangement and the psychrometric cycle and identify the corresponding points on both diagrams. Calculate the following; mass of air through the cooler coil load on cooler coil load on heater
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