Evaluation of the Vuilleumier heat pump for heating applications

Mikko Nykyri, Pekka Hiismäki

Research output: Book/ReportReportProfessional

Abstract

A general evaluation of the performance of a Vuilleumier heat pump for residential heating is given. The basic considerations were devoted to the choice of hot, intermediate and cold operating volumes and temperatures, to the phase angle of the two displacers, to the dead volumes and to the choice of the working gas. Specific attention was then paid to the heat transfer problems at each of the three temperatures. The main difficulty was identified with the solid-gas heat transfer at both low and intermediate temperatures. For a machine of gas volume 5,2 dm3, pressure 150 bar, operating frequency 1/s and heat rejecting capacity 10 kW, the temperature drops were evaluated to be 105 K over the hot end heat exchanger, 40 K over the intermediate temperature heat exchanger, and 47 K over the cold end heat exchanger. This limits the coefficient of performance defined as the ratio of the heat rejected at the intermediate temperature to the heat supplied at the high temperature to 1,9. This figure is lower still when other loss factors are taken into account. Moreover, the pressure level should necessarily be dropped in order to comply with the regulations for unauthorized users. Another sample calculation for 16 bar gas pressure, 3,3 dm3 gas volume, and 16 1/s operating frequency yielded only 1,3 for the coefficient of performance.
Original languageEnglish
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Number of pages37
ISBN (Print)951-38-1287-1
Publication statusPublished - 1981
MoE publication typeD4 Published development or research report or study

Publication series

NameTutkimuksia / Valtion teknillinen tutkimuskeskus
PublisherVTT
Volume15
ISSN (Print)0358-5077

Fingerprint

Pumps
Heating
Heat exchangers
Gases
Temperature
Heat transfer
Hot Temperature
Specific heat

Keywords

  • Vuilleumier
  • heat pumps
  • heating

Cite this

Nykyri, M., & Hiismäki, P. (1981). Evaluation of the Vuilleumier heat pump for heating applications. Espoo: VTT Technical Research Centre of Finland. Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports, No. 15
Nykyri, Mikko ; Hiismäki, Pekka. / Evaluation of the Vuilleumier heat pump for heating applications. Espoo : VTT Technical Research Centre of Finland, 1981. 37 p. (Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports; No. 15).
@book{522f42719abf4e04b53f1505834b48e7,
title = "Evaluation of the Vuilleumier heat pump for heating applications",
abstract = "A general evaluation of the performance of a Vuilleumier heat pump for residential heating is given. The basic considerations were devoted to the choice of hot, intermediate and cold operating volumes and temperatures, to the phase angle of the two displacers, to the dead volumes and to the choice of the working gas. Specific attention was then paid to the heat transfer problems at each of the three temperatures. The main difficulty was identified with the solid-gas heat transfer at both low and intermediate temperatures. For a machine of gas volume 5,2 dm3, pressure 150 bar, operating frequency 1/s and heat rejecting capacity 10 kW, the temperature drops were evaluated to be 105 K over the hot end heat exchanger, 40 K over the intermediate temperature heat exchanger, and 47 K over the cold end heat exchanger. This limits the coefficient of performance defined as the ratio of the heat rejected at the intermediate temperature to the heat supplied at the high temperature to 1,9. This figure is lower still when other loss factors are taken into account. Moreover, the pressure level should necessarily be dropped in order to comply with the regulations for unauthorized users. Another sample calculation for 16 bar gas pressure, 3,3 dm3 gas volume, and 16 1/s operating frequency yielded only 1,3 for the coefficient of performance.",
keywords = "Vuilleumier, heat pumps, heating",
author = "Mikko Nykyri and Pekka Hiism{\"a}ki",
year = "1981",
language = "English",
isbn = "951-38-1287-1",
series = "Tutkimuksia / Valtion teknillinen tutkimuskeskus",
publisher = "VTT Technical Research Centre of Finland",
address = "Finland",

}

Nykyri, M & Hiismäki, P 1981, Evaluation of the Vuilleumier heat pump for heating applications. Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports, no. 15, VTT Technical Research Centre of Finland, Espoo.

Evaluation of the Vuilleumier heat pump for heating applications. / Nykyri, Mikko; Hiismäki, Pekka.

Espoo : VTT Technical Research Centre of Finland, 1981. 37 p. (Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports; No. 15).

Research output: Book/ReportReportProfessional

TY - BOOK

T1 - Evaluation of the Vuilleumier heat pump for heating applications

AU - Nykyri, Mikko

AU - Hiismäki, Pekka

PY - 1981

Y1 - 1981

N2 - A general evaluation of the performance of a Vuilleumier heat pump for residential heating is given. The basic considerations were devoted to the choice of hot, intermediate and cold operating volumes and temperatures, to the phase angle of the two displacers, to the dead volumes and to the choice of the working gas. Specific attention was then paid to the heat transfer problems at each of the three temperatures. The main difficulty was identified with the solid-gas heat transfer at both low and intermediate temperatures. For a machine of gas volume 5,2 dm3, pressure 150 bar, operating frequency 1/s and heat rejecting capacity 10 kW, the temperature drops were evaluated to be 105 K over the hot end heat exchanger, 40 K over the intermediate temperature heat exchanger, and 47 K over the cold end heat exchanger. This limits the coefficient of performance defined as the ratio of the heat rejected at the intermediate temperature to the heat supplied at the high temperature to 1,9. This figure is lower still when other loss factors are taken into account. Moreover, the pressure level should necessarily be dropped in order to comply with the regulations for unauthorized users. Another sample calculation for 16 bar gas pressure, 3,3 dm3 gas volume, and 16 1/s operating frequency yielded only 1,3 for the coefficient of performance.

AB - A general evaluation of the performance of a Vuilleumier heat pump for residential heating is given. The basic considerations were devoted to the choice of hot, intermediate and cold operating volumes and temperatures, to the phase angle of the two displacers, to the dead volumes and to the choice of the working gas. Specific attention was then paid to the heat transfer problems at each of the three temperatures. The main difficulty was identified with the solid-gas heat transfer at both low and intermediate temperatures. For a machine of gas volume 5,2 dm3, pressure 150 bar, operating frequency 1/s and heat rejecting capacity 10 kW, the temperature drops were evaluated to be 105 K over the hot end heat exchanger, 40 K over the intermediate temperature heat exchanger, and 47 K over the cold end heat exchanger. This limits the coefficient of performance defined as the ratio of the heat rejected at the intermediate temperature to the heat supplied at the high temperature to 1,9. This figure is lower still when other loss factors are taken into account. Moreover, the pressure level should necessarily be dropped in order to comply with the regulations for unauthorized users. Another sample calculation for 16 bar gas pressure, 3,3 dm3 gas volume, and 16 1/s operating frequency yielded only 1,3 for the coefficient of performance.

KW - Vuilleumier

KW - heat pumps

KW - heating

M3 - Report

SN - 951-38-1287-1

T3 - Tutkimuksia / Valtion teknillinen tutkimuskeskus

BT - Evaluation of the Vuilleumier heat pump for heating applications

PB - VTT Technical Research Centre of Finland

CY - Espoo

ER -

Nykyri M, Hiismäki P. Evaluation of the Vuilleumier heat pump for heating applications. Espoo: VTT Technical Research Centre of Finland, 1981. 37 p. (Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports; No. 15).