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A heat pump is a machine or device that moves heat from one location (the 'source') at a lower temperature to another location (the 'sink' or 'heat sink') at a higher temperature using mechanical work or a high-temperature heat source. The difference between heat pumps and normal air conditioners is that heat pumps can be used to provide heating or cooling. Even though the heat pumps can heat, they still use the same basic refrigeration cycle to do this. In other words heat pumps can change which coil is the condenser and which the evaporator. This is normally achieved by a reversing valve. In cooler climates it is common to have heat pumps that are designed only to provide heating.

Common examples are food refrigerators and freezers, air conditioners, and reversible-cycle heat pumps for providing building space heating. In heating, ventilation, and air conditioning (HVAC) applications, a heat pump normally refers to a vapor-compression refrigeration device that includes a reversing valve and optimized heat exchangers so that the direction of heat flow may be reversed. Most commonly, heat pumps draw heat from the air or from the ground.

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FAQs About Heat Pumps

Difference between refrigerant R417A and R407C

2011-12-6

(I) R417A for heat pumps has advantages:

1. Wide temperature range in use,it can work at -15℃
2. Heat pump outlet water temperature can be up to 60℃
3. Eco-friendliness,no harm to Ozonosphere.
4. High heating efficacy.
5. Small exhaust pressure and low exhaust temperature,which makes the compressor long life.
6. Direct replacement without replacing compreesor and expansion valve at same time.
7. Compatible to R22 system,compatible to MO,POE,PAG or AB compressor lubricating oil.Low replacing costs.
8. Stable proportion of ingredients.It changes a little only when oil leakage at above 85%.
9. Meets with the requirement of European,American security and environmental protection.

(II) Performance of R417A comparing with R407C:
Refrigerant name:                                           R417A      R407C
Molecular weight:                                            106.7        86.2
Boiling point (1atm)℃:                                     -41.8        -44
Dew point (1atm)℃:                                         -36.7        -36.3
Vapor pressure (25℃) Psia:                           142.8        172
Atmos pressure:                                              10.2         12.3
Critical temperature℃:                                    89.9          86.05
Absolute temperature K:                                 363.1        359.2
Critical pressure Psia:                                     615           671.4
Liquid density (25℃) kg/m3:                           1152         1142
Specific heat of liquid (25℃) KJ/kg.K:             1.42          1.53
Specific heat rate (25℃) Cp/Cv:                     1.11          1.14
Heat of vaporization KJ/kg:                              203.4        241.2
Vapor viscosity (1atm 25℃) cP:                      0.0121      0.013
Liquid viscosity (25℃) cP:                               0.162        0.153
Ozone elimination potential ODP:                    0               0
Greenhouse effect factor HGWP:                    0.49          0.40
Combustibility:                                                  Non           Non

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FAQs About Heat Pumps

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Difference between refrigerant R417A and R407C