Evaluation of the performance and emission of a gas fired heat pump /
This thesis discusses the overall operating and emissive
| Main Author: | |
|---|---|
| Format: | Thesis Book |
| Language: | English |
| Published: |
[Place of publication not identified] :
[publisher not identified] ;
1998.
|
| Subjects: |
| Summary: | This thesis discusses the overall operating and emissive performance of the three ton (1 0.6 kW) York Triathlon gas- fired heat pump. Performance and emission test results from environmental chamber testing for steady state and transient operation of the heat pump during cooling and heating operation are presented. The emission trends of NO,,, CO, unburned hydrocarbons (UHC), and C02 with engine operating parameters and outdoor temperature are also discussed. The steady state performance was measured at outdoor temperatures ranging from 75'F (23.9'C) to 115'F (46.l'C) for cooling and from 17'F (-8.3'C) to 62'F (16.7'C) for heating tests. Engine speed was varied from 1200 rpm to 3000 rpm. The emissions from the natural gas engine were also measured at these same test conditions. The parameters of delivered capacity, gas energy input, electric power input, auxiliary heating capacity, sensible heat ratio (SHR), and coefficient of performance (COP) were measured to quantify the system's performance. COP's ranged from 0.75 to 1.6 during cooling and from 0.9 to 1.5 for heating. The Seasonal COP for each mode was calculated to be 1.28 during cooling and 1.25 during heating. The emissions of interest (NOx, CO, C02, and UHC), the fuel-air equivalence ratio ([ ]), and exhaust temperature were reported to quantify the emission characteristics of the system. The engine was found to run lean, 0.6<[ ]<0.75, to minimize the emissions of NOx, CO, and UHC. Performance and emission tests during the transient operation in the cooling and heating mode were also conducted. The cooling transient COP decreased by 27% from the steady state test results. A degradation coefficient (CD) of 0.35 was calculated from the tests. The decreased performance as compared to the steady state test results during heating was even more significant with a 3 8% decrease in COP. The calculated CD was 0.38. The emission characteristics during transient operation were also poorer compared to steady state results with measured increases in the peak concentration of NOx as much as 107% and 7 1 % for UHC. Measured increases for the peak concentration of the other emissions during transient operation were 25% for CO and 22% for C02- |
|---|---|
| Item Description: | Vita. "Major subject: Mechanical Engineering". |
| Physical Description: | xvii, 138 leaves : illustrations ; 28 cm. Issued also on microfiche from Lange Micrographics. |
| Bibliography: | Includes bibliographical references: pages 121-123. |