ESCO Air Conditioning Practice Exam 2025 - Free AC Certification Practice Questions and Study Guide

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If 10 pounds of refrigerant pass through a water-cooled condenser losing 20 BTUs of heat per pound, and 10 pounds of water enter at 80°F, what is the temperature of the water leaving the condenser?

90°F

95°F

100°F

To determine the temperature of the water leaving the condenser, you need to calculate how much heat is absorbed by the water due to the refrigerant losing heat in the condenser.

First, calculate the total heat removed from the refrigerant. If 10 pounds of refrigerant lose 20 BTUs per pound, you multiply the mass of the refrigerant by the heat loss per pound:

Total heat loss = 10 pounds × 20 BTUs/pound = 200 BTUs.

This 200 BTUs is what the water will absorb as it flows through the condenser.

Next, consider the water entering the condenser at 80°F. To find the temperature of the water leaving the condenser after absorbing the heat, we can use the formula for heat transfer, which is:

Heat absorbed = mass of water × specific heat of water × change in temperature.

Assuming we're dealing with typical water properties, the specific heat of water is about 1 BTU per pound per °F. Given that we have 10 pounds of water, we can rearrange the formula to find the change in temperature:

200 BTUs = 10 pounds × 1 BTU/pound/°F × (T_final - 80°F).

Let T_final represent

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105°F

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