A food-processing plant requires that two large process areas A and B be kept at constant temperature TA = - 8°C and TB 12°C. The refrigeration load of area A is 175 kW. The heating load of area B is 210 kW. Conditioning of the two spaces is achieved by an (cyclic) electrical air-conditioning and heating unit (CM) that also interacts with the environment at To = 5°C, as shown in the %3D figure.

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Chapter1: Basic Modes Of Heat Transfer
Section: Chapter Questions
Problem 1.7P: A cooling system is to be designed for a food storage warehouse for keeping perishable foods cool...
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3. A food-processing plant requires that two
large process areas A and B be kept at
constant temperature TA
12°C. The refrigeration load of area A is 175
kW. The heating load of area B is 210 kW.
Conditioning of the two spaces is achieved by
an (cyclic) electrical air-conditioning and
heating unit (CM) that also interacts with the
environment at To = 5°C, as shown in the
В., 12°С
8°C and TB
Work
R
5°C
figure.
А, —8°С
a. What is the least amount of electrical power required to operate the air-
conditioning and heating unit?
b. Determine the rate of energy exchange between the unit (CM) and the
environment in case a.
Transcribed Image Text:3. A food-processing plant requires that two large process areas A and B be kept at constant temperature TA 12°C. The refrigeration load of area A is 175 kW. The heating load of area B is 210 kW. Conditioning of the two spaces is achieved by an (cyclic) electrical air-conditioning and heating unit (CM) that also interacts with the environment at To = 5°C, as shown in the В., 12°С 8°C and TB Work R 5°C figure. А, —8°С a. What is the least amount of electrical power required to operate the air- conditioning and heating unit? b. Determine the rate of energy exchange between the unit (CM) and the environment in case a.
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