Design and preliminary analysis for measuring transient mass rate of flow in unitary heat pumps
Because of the time and expense involved in building and testing prototype heat pumps, mathematical models of heat pumps have been developed. These models and experimental work show that refrigerant movement and/or migration during start-up, shut-down and frosting-defrosting is an important parameter. Little information is known about this movement. Therefore, good experimental data of mass flow rate into and out of each component of the heat pump during these transient time are needed. Unfortunately, no mass flow meter exists that can currently measure two-phase flow rates. This paper describes the system designed, the major problem encountered, and gives some preliminary results of a system to continuously measure the change in refrigerant mass in the evaporator, condenser, accumulator and compressor of a heat pump during both start-up and shut-down conditions. With these measurements, knowing the total charge in the system and measuring with a conventional flow meter the mass rate of flow leaving the compressor, the mass rate of flow entering and leaving each component (including liquid lines) can be determined.
- Research Organization:
- Magnavox Electric Systems Co., Fort Wayne, IN
- OSTI ID:
- 7253461
- Report Number(s):
- CONF-860106-
- Journal Information:
- ASHRAE Trans.; (United States), Vol. 92:1B; Conference: ASHRAE semi-annual meeting, San Francisco, CA, USA, 19 Jan 1986
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
HEAT PUMPS
DESIGN
MASS TRANSFER
TWO-PHASE FLOW
ACCUMULATORS
ACCURACY
COMPARATIVE EVALUATIONS
COMPRESSORS
CONDENSERS
EVAPORATORS
FLOW MODELS
FLOW RATE
FLOWMETERS
HYDRODYNAMICS
MEASURING METHODS
METERING
MODIFICATIONS
OPERATION
REFRIGERANTS
START-UP
SYSTEMS ANALYSIS
WEIGHT MEASUREMENT
CONTAINERS
FLUID FLOW
FLUID MECHANICS
FLUIDS
MATHEMATICAL MODELS
MEASURING INSTRUMENTS
MECHANICS
METERS
TANKS
WORKING FLUIDS
320100* - Energy Conservation
Consumption
& Utilization- Buildings