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1. Q_1 -Heat delivered to cooling water from compressor:
2. Q_2- Heat delivered to condenser cooling water:
3. Coefficient of performance for the heat delivered to the conductor only:
4. Coefficient of performance due to total heat delivered to water, including waste heat from compressor cooling coil:
To determine the power input, heat output and coefficient of performance of the heat pump.
To determine the production of heat pump performance curves over a range of source and delivery temperature.
To compare coefficient of performance of both the air and the water evaporator.
Introduction
Tabulated values
Graphs
A heat pump is a device which allows transport of heat from a lower temperature level to a higher one, by using external energy (European Renewable Energy Council, 2008).
The air and water heat pump being used in the experiment relies on the vapour compression cycle which need a small work input to transfer heat from either air or water source evaporator to a water cooled condenser.
Air Evaporator
Vapor Compression Cycle (Setup)
How does a heat pump work?
Water Evaporator
Coefficient of Performance
BEng (Hons) Mechanical Engineering (Minor: Energy Systems)
Thermodynamics (MECH 1013 Y)
Graph of Coefficient of Performance
Coefficient of performance may be used as a measure of efficiency for a heat pump.
Higher CoPs equate to lower operating costs.
Given the same energy source and operating conditions, a higher CoP heat pump will consume less purchased energy than one with a lower CoP.
Experimenters’s names:
Bhekhun Teshant (1315591)
Kissoon Vidur Doorgesh (1315340)
HOSANY Beebee Hamnah (1312661)
HOSSENBACCUS Mohammad Zoheb (1314610)
Visram Ashwan (1311296)
Toshinath Bissessur (1314486)
Experiment No 3
Analysis
Applications
This experiment, enhances our knowledge on the concept of how heat can actually move from a region of low temperature to that of a higher one due to work done. Thus, this experiment simplified the understanding of part of the second law of thermodynamics, more precisely, the Carnot cycle.
From the above given information, it can be deduced that a water evaporator heat pump is more “efficient” than an air evaporator heat pump, due to the high value of coefficient of performance of approximately 3.8 compared to the air evaporator which has a coefficient of performance of approximately 0.8.
Safety Precautions
Sensitivity Analysis
Air Evaporator
Sensitivity analysis for this experiment shows that for both types of evaporators, variations in T7 have the most prominent influence on the outcome (Coefficient of performance) compared to variations of mass flow rate and T6.
Water Evaporator